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IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
FEATURES:
* * * * * * * * * * * * * * * * * * * * Three internal PLLs Internal non-volatile EEPROM JTAG and FAST mode I2C serial interfaces Input Frequency Ranges: 1MHz to 400MHz Output Frequency Ranges: 4.9kHz to 500MHz Reference Crystal Input with programmable oscillator gain and programmable linear load capacitance - Crystal Frequency Range: 8MHz to 50MHz Each PLL has an 8-bit pre-scaler and a 12-bit feedback-divider 10-bit post-divider blocks Fractional Dividers Two of the PLLs support Spread Spectrum Generation capability I/O Standards: - Outputs - 3.3V LVTTL/ LVCMOS, LVPECL, and LVDS - Inputs - 3.3V LVTTL/ LVCMOS Programmable Slew Rate Control Programmable Loop Bandwidth Settings Programmable output inversion to reduce bimodal jitter Redundant clock inputs with glitchless auto and manual switchover options JTAG Boundary Scan Individual output enable/disable Power-down mode 3.3V VDD Available in TQFP and VFQFPN packages
IDT5V9885
The IDT5V9885 is a programmable clock generator intended for high performance data-communications, telecommunications, consumer, and networking applications. There are three internal PLLs, each individually programmable, allowing for three unique non-integer-related frequencies. The frequencies are generated from a single reference clock. The reference clock can come from one of the two redundant clock inputs. A glitchless automatic or manual switchover function allows any one of the redundant clocks to be selected during normal operation. The IDT5V9885 can be programmed through the use of the I2C or JTAG interfaces. The programming interface enables the device to be programmed when it is in normal operation or what is commonly known as insystem programmable. An internal EEPROM allows the user to save and restore the configuration of the device without having to reprogram it on power-up. JTAG boundary scan is also implemented. Each of the three PLLs has an 8-bit pre-scaler and a 12-bit feedback divider. This allows the user to generate three unique non-integer-related frequencies. The PLL loop bandwidth is programmable to allow the user to tailor the PLL response to the application. For instance, the user can tune the PLL parameters to minimize jitter generation or to maximize jitter attenuation. Spread spectrum generation and fractional divides are allowed on two of the PLLs. There are 10-bit post dividers on five of the six output banks. Two of the six output banks are configurable to be LVTTL, LVPECL, or LVDS. The other four output banks are LVTTL. The outputs are connected to the PLLs via the switch matrix. The switch matrix allows the user to route the PLL outputs to any output bank. This feature can be used to simplify and optimize the board layout. In addition, each output's slew rate and enable/disable function can be programmed.
DESCRIPTION:
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
c 2007 Integrated Device Technology, Inc.
OCTOBER 2007
1
DSC 6787/39
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
FUNCTIONAL BLOCK DIAGRAM
XTALOUT OSC. XTALIN/REFIN
OUT1
P2 Divider 10-Bit /2
OUT2
PLL 0
CLKIN
P3 Divider 10-Bit /2
OUT3
PLL 1
P4 Divider 10-Bit /2
OUT4
(1)
OUT4
(1)
PLL 2
SHUTDOWN/OE
P5 Divider 10-Bit /2
OUT5
(1)
OUT5
(1)
EEPROM
P6 Divider 10-Bit /2
OUT6
GIN5/CLK_SEL
Control Block for Multi-Purpose I/O, Programming, Features
I 2 C/JTAG
GOUT0/TDO/ LOSS_LOCK GOUT1/ LOSS_CLKIN
GIN1/SCLK/TCLK
GIN3/SUSPEND
GIN2/TMS
NOTE: 1. OUT4 and OUT5 pairs can be configured to be LVDS, LVPECL, or two single-ended LVTTL outputs. As LVTTL, OUT4 and OUT5 can be configured to be non-inverting.
GIN0/SDAT/TDI
2
GIN4/TRST
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
GOUT0.TDO/LOSS_LOCK
GOUT0.TDO/LOSS_LOCK
SHUTDOWN/OE
SHUTDOWN/OE
GIN3/SUSPEND
GIN3/SUSPEND
GIN4/TRST
32 CLKIN GND GOUT1/LOSS_CLKIN XTALIN/REFIN XTALOUT OUT1 VDD OUT3 1 2 3 4 5 6 7 8 9
GND
31
30
29
28
27
26
25 24 23 22 21 20 19 18 17 GIN2/TMS VDD
2 8 CLKIN GND
I 2 C/JTAG GIN5/CLK_SEL GIN1/SCLK/TCLK GIN0/SDA/TDI GND VDD
2 7
2 6
2 5
2 4
2 3
GIN4/TRST
OUT2
GND
VDD
OUT2
GND
VDD
VDD
2 2 2 1 2 0 1 9 GIN2/TMS VDD I 2 C/JTAG GIN5/CLK_SEL GIN1/SCLK/TCLK GIN0/SDA/TDI VDD
1 2 3 4 5 6 7 8
OUT4
GOUT1/LOSS_CLKIN XTALIN/REFIN XTALOUT OUT1 OUT3
GND
1 8 1 7 1 6 1 5
9
OUT4
1 0
VDD
1 1
OUT6
1 2
GND
1 3
OUT5
1 4
OUT5
10
OUT4
11
OUT4
12
VDD
13
OUT6
14
GND
15
OUT5
16
OUT5
TQFP TOP VIEW
VFQFPN TOP VIEW
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IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
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PIN DESCRIPTION
Pin Name CLKIN XTALIN/REFIN XTALOUT GIN0/SDAT/TDI GIN1/SCLK/TCK GIN2/TMS GIN3/SUSPEND GIN4/TRST GIN5/CLK_SEL SHUTDOWN/OE I2C/JTAG OUT1 OUT2 OUT3 OUT4 OUT4 OUT5 OUT5 OUT6 GOUT0/TDO/LOSS_LOCK GOUT1/LOSS_CLKIN VDD GND PF32 Pin# 1 4 5 19 20 24 27 25 21 28 22 6 29 8 10 11 15 16 13 31 3 7,12,17, 23,26,32 2,9,14, 18,30 NL28 Pin# 1 4 5 16 17 21 23 22 18 24 19 6 25 7 8 9 13 14 11 27 3 10,15,20 28 2,12,26 I/O I I O I I I I I I I I O O O O O O O O O O Type LVTTL LVTTL LVTTL LVTTL
(3) (3)
Description Input Clock CRYSTAL_IN - Reference crystal input or external reference clock input CRYSTAL_OUT -Reference crystal feedback Multi-purpose inputs. Can be used for Frequency Control, SDAT(I2C), or TDI(JTAG). Multi-Purpose inputs. Can be used for Frequency Control, SCLK(I2C), or TCK(JTAG). Multi-Purpose inputs. Can be used for Frequency Control or TMS (JTAG) Multi-Purpose inputs. Can be used for Frequency Control or as a suspend mode control input (active HIGH). Multi-Purpose inputs. Can be used for Frequency Control or TRST (JTAG) Multi-Purpose inputs. Can be used for Frequency Control or input clock selector. Enables/disables the outputs or powers down the chip. The SP bit (0x1C) controls the polarity of the signal to be either active HIGH or LOW. (Default is active HIGH.) I2C (HIGH) or MFC Mode (MID) or JTAG Programming (LOW) Configurable clock output 1. Can also be used to buffer the reference clock. Configurable clock output 2 Configurable clock output 3
(1)
LVTTL
LVTTL(3) LVTTL(3) LVTTL(3) LVTTL(3) LVTTL
(3)
3-level(2) LVTTL LVTTL LVTTL Adjustable Adjustable(1) Adjustable(1) Adjustable(1) LVTTL LVTTL
(3)
Configurable clock output 4, Single-Ended or Differential when combined with OUT4 Configurable complementary clock output 4, Single-Ended or Differential when combined with OUT4 Configurable clock output 5, Single-Ended or Differential when combined with OUT5 Configurable complementary clock output 5, Single-Ended or Differential when combined with OUT5 Configurable clock output 6 Multi-Purpose Output. Can be programmed to use as PLL LOCK signal, LOSS_LOCK or TDO in JTAG mode Multi-Purpose Output. Can be programmed to use as LOSS_CLKIN 3.3V Power Supply Ground
LVTTL
NOTES: 1. Outputs are user programmable to drive single-ended 3.3V LVTTL, differential LVDS, or differential LVPECL interface levels. 2. 3-level inputs are static inputs and must be tied to VDD or GND or left floating. These inputs are internally biased to VDD/2. They are not hot-insertable or over voltage tolerant. 3. The JTAG (TDO, TMS, TCLK, TRST, and TDI) and I2C (SCLK and SDAT) signals share the same pins with GIN signals.
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IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
PLL FEATURES AND DESCRIPTIONS
D0 Divider
VCO
M0 Multiplier
Spread Spectrum Modulation
PLL0 Block Diagram
D1 Divider
VCO
M1 Multiplier
Spread Spectrum Modulation
PLL1 Block Diagram
D2 Divider
VCO
M2 Multiplier
PLL2 Block Diagram 5
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
Pre-Divider (D) Values PLL0 PLL1 PLL2 1 - 255 1 - 255 1 - 255
Multiplier (M) Values 2 - 8190 2 - 8190 1 - 4095
Programmable Loop Bandwidth yes yes yes
Spread Spectrum Generation Capability yes yes no
REFERENCE CLOCK INPUT PINS AND SELECTION
The 5V9885 supports up to two clock inputs. One of the clock inputs (XTALIN/ REFIN) can be driven by either an external crystal or a reference clock. The second clock input (CLKIN) can only be driven from an external reference clock. Either clock input can be set as a the primary clock. The primary clock designation is to establish which is the main reference clock to the PLLs. The non-primary clock is designated as the secondary clock in case the primary clock goes absent and a backup is needed. The PRIMCLK bit (0x34) determines which clock input will be the primary clock. When PRIMCLK bit is "0", it will select XTALIN/REFIN as the primary, and when "1", it will select CLKIN as the primary. The two external reference clocks can be manually selected using the GIN5/ CLK_SEL pin, except in Manual Frequency Control (MFC) mode 2, or via programming by hard wiring the CLK_SEL pin and toggling the PRIMCLK bit. For more details on the MFC modes, refer to the CONFIGURING MULTIPURPOSE I/Os section. When CLK_SEL is LOW, the primary clock is selected and when HIGH, the secondary clock is selected. The SM bits (0x34) must be set to "0x" for manual switchover which is detailed in SWITCHOVER MODES section.
GIN5/CLK_SEL L H Selected Clock Input Primary Secondary
XTAL load cap = 3.5pF + XTALCAP[7:0] * 0.125pF (Eq. 1)
Parameter XTALCAP Bits 8 Step 0.125 Min 0 Max 32 Units pF
When using an external reference clock instead of a crystal on the XTAL/ REFIN pin, the input load capacitors may be completely bypassed. This allows for the input frequency to be up to 200MHz. When using an external reference clock, the XTALOUT pin must be left floating, XTALCAP must be programmed to the default value of "0", and crystal drive strength bit, XDRV (0x06), must be set to the default value of "11". CLKIN Pin CLKIN pin is a regular clock input pin, and can be driven up to 400MHz.
PRE-SCALER, FEEDBACK-DIVIDER, AND POST-DIVIDER
Each PLL incorporates an 8-bit pre-scaler and a 12-bit feedback divider which allows the user to generate three unique non-integer-related frequencies. For output banks OUT2-OUT6, each bank has a 10-bit post-divider. The following equation governs how the frequency on output banks OUT2-6 is calculated. M FOUT = FIN *( D ) (Eq. 2) P*2 Where FIN is the reference frequency, M is the total feedback-divider value, D is the pre-scaler value, P is the total post-divider value, and FOUT is the resulting output bank frequency. The value 2 in the denominator is due to the divideby-2 on each of the output banks OUT2-6. Note that OUT1 does not have any type of post-divider. Also, programming any of the dividers may cause glitches on the outputs. Pre-Scaler D[7:0] are the bits used to program the pre-scaler for each PLL, D0 for PLL0, D1 for PLL1, and D2 for PLL2. The pre-scalers divide down the reference clock with integer values ranging from 1 to 255. To maintain low jitter, the divided down clock must be higher than 400KHz; it is best to use the smallest D divider value possible. If D is set to '0x00', then this will power down the PLL and all the outputs associated with that PLL.
Crystal Input (XTALIN/REFIN) The crystal oscillators should be fundamental mode quartz crystals: overtone crystals are not suitable. Crystal frequency should be specified for parallel resonance with 50 maximum equivalent series resonance. When the XTALIN/REFIN pin is driven by a crystal, it is important to set the internal oscillator inverter drive strength and internal tuning/load capacitor values correctly to achieve the best clock performance. These values are programmable through either I2C or JTAG interface to allow for maximum compatibility with crystals from various manufacturers, processes, performances, and qualities. The internal load capacitors are true parallel-plate capacitors for ultra-linear performance. Parallel-plate capacitors were chosen to reduce the frequency shift that occurs when non-linear load capacitance interacts with load, bias, supply, and temperature changes. External non-linear crystal load capacitors should not be used for applications that are sensitive to absolute frequency requirements. The value of the internal load capacitors are determined by XTALCAP[7:0] bits, (0x07). The load capacitance can be set with a resolution of 0.125 pF for a total crystal load range of 3.5pF to 35.4pF. Check with the vendor's crystal load capacitance specification for the exact setting to tune the internal load capacitor. The following equation governs how the total internal load capacitance is set. 6
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
Feedback-Divider N[11:0] and A[3:0] are the bits used to program the feedback-divider for PLL0 (N0 and A0) and PLL1 (N1 and A1). If spread spectrum generation is enabled for either PLL0 or PLL1, then the SS_OFFSET[5:0] bits (0x61, 0x69) would be factored into the overall feedback divider value. See the SPREAD SPECTRUM GENERATION section for more details on how to configure PLL0 and PLL1 when spread spectrum is enabled. The two PLLs can also be configured for fractional divide ratios. See FRACTIONAL DIVIDER for more details. For PLL2, only the N[11:0] bits (N2) are used to program its feedback divider and there is no spread spectrum generation and fractional divides capability. The12-bit feedback-divider integer values range from 1 to 4095. The following equations govern how the feedback divider value is set. Note that the equations are different for PLL0/PLL1 and PLL2 PLL0 and PLL1: M = 2*N[11:0] + A[3:0] + 1 + SS_OFFSET[5:0] * 1/64 M = 2*N[11:0] + A[3:0] + 1 (spread spectrum disabled) A[3:0] = 0000 = -1 = 0001 = 1 = 0010 = 2 = 0011 = 3 . . . = 1111 = 15 Note: A[3:0] < (N[11:0] - 5), must be met when using A. N cannot be programmed with a value of 4, 8, or 16 when using A. PLL2: M = N[11:0] (Eq. 5) (Eq. 3) (Eq. 4)
The user can achieve an even or odd integer divide ratio for both PLL0 and PLL1 by setting the A[3:0] bits accordingly and disabling the spread spectrum. A fractional divide can also be set for PLL0 and PLL1 by using the A[3:0] bits in conjunction with the SS_OFFSET[5:0] bits, which is detailed in the FRACTIONAL DIVIDER section. Note that the VCO has a frequency range of 10MHz to 1200MHz. To maintain low jitter, it is best to maximize the VCO frequency. For example, if the reference clock is 100MHz and a 200MHz clock is required, to achieve the best jitter performance, multiply the 100MHz by 12 to get the VCO running at the highest possible frequency of 1200MHz and then divide it down to get 200MHz. Or if the reference clock is 25MHz and 20MHz is the required clock, multiply the 25MHz by 40 to get the VCO running at 1000MHz and then divide it down to get 20MHz. If N is set to '0x00', the VCO will slew to the minimum frequency. Post-Divider Q[9:0] are the bits used to program the 10-bit post-dividers on output banks OUT2-6. OUT1 bank does not have a 10-bit post-divider or any other postdivide along its path. The 10-bit post-dividers will divide down the output banks' frequency with integer values ranging from 1 to 1023. There is the option to choose between disabling the post-divider, utilizing a div/1, a div/2, or the 10-bit post-divider by using the PM[1:0] bits. . Each bank, except for OUT1, has a set of PM bits. When disabling the post-divider, no clock will appear at the outputs, but will remain powered on. The values are listed in the table below.
P
00 01
PM[1:0] 00 01 10 11
P Post-Divider disabled div/1 div/2 Q[9:0] + 2 (Eq. 6)
VCO
/2 / (Q+2) 10 11
To Outputs /2
PM[1:0]
Post-Divider Diagram 7
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
Note that the actual 10-bit post-divider value has a 2 added to the integer value Q and the outputs are routed through another div/2 block. The post-divider should never be disabled unless the output bank will never be used during normal operation. The output frequency range for LVTTL outputs are from 4.9KHz to 200MHz. The output frequency range for LVPECL/LVDS outputs are from 4.9KHz to 500MHz.
SPREAD SPECTRUM GENERATION
PLL0 and PLL1 support spread spectrum generation capability, which users have the option of turning on and off. Spread spectrum profile, frequency, and spread are fully programmable (within limits). The programmable spread spectrum generation parameters are TSSC[3:0], NSSC[3:0], SS_OFFSET[5:0], SD[3:0], DITH, and X2 bits. These bits are in the memory address range of 0x60 to 0x67 for PLL0 and 0x68 to 0x6F for PLL1. The spread spectrum generation on PLL0 & PLL1 can be enabled/disabled using the TSSC[3:0] bits. To enable spread spectrum, set TSSC > '0' and set NSSC, SD[3:0], SD[5:0], and the A[3:0] in the total M value accordingly. And to disable, set TSSC = '0'. TSSC[3:0] These bits are used to determine the number of phase/frequency detector cycles per spread spectrum cycle (ssc) steps. The modulation frequency can be calculated with the TSSC bits in conjunction with the NSSC bits. Valid TSSC integer values for the modulation frequency range from 5 to 14. NSSC[3:0] These bits are used to determine the number of delta-encoded samples used for a single quadrant of the spread spectrum waveform. All four quadrants of the spread spectrum waveform are mirror images of each other. The modulation frequency is also calculated based off the NSSC bits in conjunction with the TSSC bits. Valid NSSC integer values range from 1 to 6. SS_OFFSET[5:0] These bits are used to program the fractional offset with respect to the nominal M integer value. For center spread, the SS_OFFSET should be set to '0' so the spread spectrum waveform is about the nominal M (Mnom) value. For down spread, the SS_OFFSET > '0' so the spread spectrum wavform is about the (Mideal -1 = Mnom) value. The downspread percentage can be thought of in terms of center spread. For example, a downspread of -1% can also be considered as a center spread of 0.5% but with Mnom shifted down by one and offset. The SS_OFFSET has integer values ranging from 0 to 63. SD[3:0] These bits are used to shape the profile of the spread spectrum waveform. These are delta-encoded samples of the waveform. There are twelve sets of SD samples for each PLL. The NSSC bits determine how many of these samples are used for the waveform. The sum of these delta-encoded samples (sigmadelta-encoded samples) determine the amount of spread and should not exceed (63 - SS_OFFSET). The maximum spread is inversely proportional to the nominal M integer value. DITH This bit is for dithering the sigma-delta-encoded samples. This will randomize the least-significant bit of the input to the spread spectrum modulator. Set the bit to '1' to enable dithering. X2 This bit will double the total value of the sigma-delta-encoded-samples which will increase the amplitude of the spread spectrum waveform by a factor of two. When X2 is '0', the amplitude remains nominal but if set to '1', the amplitude is increased by x2. The following equations govern how the spread spectrum is set: TSSC = TSSC[3:0] + 2 NSSC = NSSC[3:0] * 2 (Eq. 7) (Eq. 8)
SD[3:0]K = SJ+1(unencoded) - SJ(unencoded) (Eq. 9) where SJ is the unencoded sample out of a possible 12 and SDK is the delta-encoded sample out of a possible 12. Amplitude = (2*N[11:0] + A[3:0] + 1) * Spread% / 100 2 if 1 < Amp < 2, then set X2 bit to '1'. (Eq. 10)
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IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
Modulation frequency: FPFD = FIN / D (Eq. 11) FVCO = FPFD * MNOM (Eq. 12) FSSC = FPFD / (4 * Nssc * Tssc) (Eq. 13)
Spread: = SD0 + SD1 + SD2 + ... + SD11 the number of samples used depends on the NSSC value 63 - SS_OFFSET Spread% = * 100 64 * (2*N[11:0] + A{3:0} + 1) (Eq. 14)
Max Spread% / 100 = 1 / MNOM or 2 / MNOM (X2=1) Profile: Waveform starts with SS_OFFSET, SS_OFFSET + SDJ, SS_OFFSET + SDJ+1, etc.
Spread Spectrum Using Sinusoidal Profile
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IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
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Example FIN = 25MHz, FOUT = 100MHz, Fssc = 33KHz with center spread of 2%. Find the necessary spread spectrum register settings. Since the spread is center, the SS_OFFSET can be set to '0'. Solve for the nominal M value; keep in mind that the nominal M should be chosen to maximize the VCO. Start with D = 1, using Eq.10 and Eq.11. MNOM = 1100MHz / 25MHz = 44 Using Eq.4, we arbitrarily choose N = 20, A = 3. Now that we have the nominal M value, we can determine TSSC and NSSC by using Eq.12. Nssc * Tssc = 25MHz / (33KHz * 4) = 190 However, using Eq. 7 and Eq.8, we find that the closest value is when TSSC = 14 and NSSC = 6. Keep in mind to maximize the number of samples used to enhance the profile of the spread spectrum waveform. Tssc = 14 + 2 = 16 Nssc = 6 * 2 = 12 Nssc * Tssc = 192 Use Eq.14 to determine the value of the sigma-delta-encoded samples. 2% = * 100 64 * 44 = 56.32 Either round up or down to the nearest integer value. Therefore, we end up with 56 or 57 for sigma-delta-encoded samples. Since the sigma-delta-encoded samples must not exceed 63 with SS_OFFSET set to '0', 56 or 57 is well within the limits. It is the discretion of the user to define the shape of the profile that is better suited for the intended application. Using Eq.14 again, the actual spread for the sigma-delta-encoded samples of 56 and 57 are 1.99% and 2.02%, respectively. Use Eq.10 to determine if the X2 bit needs to be set; Amplitude = 44 * (1.99 or 2.02) / 100 = 0.44 < 1 2 Therefore, the X2 = '0 '. The dither bit is left to the discretion of the user. The example above was of a center spread using spread spectrum. For down spread, the nominal M value can be set one integer value lower to 43. Note that the 5v9885 should not be programmed with TSSC > '0', SS_OFFSET = '0', and SD = '0' in order to prevent an unstable state in the modulator. The PLL loop bandwidth must be at least 10x the modulation frequency along with higher damping (larger uz) to prevent the spread spectrum from being filtered and reduce extraneous noise. Refer to the LOOP FILTER section for more detail on uz. The A[3:0] must be used for spread spectrum, even if the total multiplier value is an even integer.
FRACTIONAL DIVIDER
There is the option for the feedback-divider to be programmed as a fractional divider for only PLL0 and PLL. By setting TSSC > '0' and SD bits to '0', the SS_OFFSET bits would determine the fractional divide value. See the SPREAD SPECTRUM GENERATION section for more details on the TSSC, SD, and SS_OFFSET bits. The following equation governs how the fractional divide value is set. M = 2*N[11:0] + A[3:0] + 1 + SS_OFFSET[5:0] *1/64
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IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
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The spread spectrum parameters such as the modulation frequency and profile will not be enabled nor will it have any impact on the PLL output when the PLL is programmed for fractional divide. The following is an example of how to set the fractional divider. Example FIN = 20MHz, FOUT1 = 168.75MHz, FOUT2 = 350MHz Solving for 350MHz using Eq.2 and Eq.3 with PLL0 and spread spectrum off, 350MHz = 20MHz * (M / D) P*2 For better jitter performance, keep D as small as possible 350MHz * 2 = M = 35 20MHz P1 Therefore, we have D = 1, M = 35 (N = 16, A = 2) for PLL0 with P = 1 on output bank4 resulting in 350MHz. Solving for 168.75MHz with PLL1 and fractional divide enabled: 168.75MHz = 20MHz * (M / D) P*2 168.75MHz * 2 = M = 16.875 or 33.75 20MHz P 1 2 The 33.75 value is chosen to achieve the highest VCO frequency possible. Next step is to figure out the setting for the fractional divide using Eq.3. 33.75 = 2*N + A + 1 + SS_OFFSET * 1/64 Integer value 33 can be determined by N and A, thus leaving 0.75 left to be solved. 2*N + A + 1 = 33 SS_OFFSET = 64 * 0.75 = 48 Therefore, we have D=1, M=33.75 (N=15, A=2, SS_OFFSET=48) for PLL1 with P=2 on an output bank resulting in 168.75MHz. The fractional divider can be determined if it is needed by following the steps in the previous example. Note that the 5v9885 should not be programmed with TSSC > '0', SS_OFFSET = '0', and SD = '0' in order to prevent an unstable state in the modulator. The A[3:0] must be used and set to be greater than '2' for a more accurate fractional divide.
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IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
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LOOP FILTER
The loop filter for each PLL can be programmed to optimize the jitter performance. The low-pass frequency response of the PLL is the mechanism that dictates the jitter transfer characteristics. The loop bandwidth can be extracted from the jitter transfer. A narrow loop bandwidth is good for jitter attenuation while a wide loop bandwidth is best for low jitter generation. The specific loop filter components that can be programmed are the resistor via the RZ[3:0] bits, pole capacitor via the CZ[3:0] bits, zero capacitor via the CP[3:0] bits, and the charge pump current via the IP[2:0] bits. The following equations govern how the loop filter is set.
VDD
Ip UP From PFD DOWN Rz Ip Cp Cz To VCO
Charge Pump and Loop Filter Configuration
Resistor (Rz) = 0.3K + RZ[3:0] * 1K
(Eq. 15)
Zero capacitor (Cz) = 6pF + CZ[3:0] * 27.2pF (Eq. 16) Pole capacitor (Cp) = 1.3pF + CP[3:0] * 0.75pF (Eq. 17) Charge pump current (Ip) = 5 * 2IP[2:0] A
Parameter RZ CZ CP IP Bits 4 4 4 3
(Eq. 18)
Step 1 27.2 0.75 2
n
Min 0.3 6 1.3 5
Max 15.3 414 12.55 640
Units K pF pF A
PLL loop filter design is beyond the scope of this datasheet. Refer to design procedures for 3-order charge-pump based PLLs. For the sake of simplicity, the fastest and easiest way to calculate the PLL loop bandwidth (Fc) given the programmable loop filter parameters is as follows. PLL Loop Bandwidth: Charge pump gain (K) = Ip / 2 (Eq. 19) VCO gain (KVCO) = 950MHz/V * 2 (Eq. 20) M = Total multiplier value (See the PRE-SCALERS, FEEDBACK-DIVIDERS, POST-DIVIDERS section for more detail) c = Rz * K * KVCO * Cz (Eq. 21) M * (Cz + Cp) Fc = c / 2 (Eq. 22)
Note, the phase/frequency detector frequency (FPFD) is typically seven times the PLL closed-loop bandwidth (Fc) but too high of a ratio will reduce your phase margin thus compromising loop stability.
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IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
To determine if the loop is stable, the phase margin (m) would need to be calculated as follows. Phase Margin: z = 1 / (Rz * Cz) p = Cz + Cp Rz * Cz * Cp (Eq. 23) (Eq. 24) (Eq. 25)
m = (360 / 2 ) * [tan-1(c/ z) - tan-1(c/ p)]
To ensure stability in the loop, the phase margin is recommended to be > 60 but too high will result in the lock time being excessively long. Certain loop filter parameters would need to be compromised to not only meet a required loop bandwidth but to also maintain loop stability. Example Fc = 150KHz is the desired loop bandwidth. The total M value is 850. The ratio of p/c should be at least 4. A rule of thumb that will help to aid the way, the p / c ratio should be at least 4. Given Fc and M, an optimal loop filter setting needs to be solved for that will meet both the PLL loop bandwidth and maintain loop stability. The charge pump gain should be relatively small as possible to achieve a low loop bandwidth. Ip = 40uA . K * KVCO = 950MHz/V * 40uA = 38000A/Vs Loop Bandwidths c = 2 * Fc = 9.42x105 s-1 uz = p / c = 4 c2 = p * z (Eq. 26) (Eq. 27)
p = Cz + Cp = z (1 + Cz / Cp) Rz * Cz * Cp Solving for Cz, Cp, and Rz Knowing c = Rz * K * KVCO * Cz and substituting in the equations from above, M * (Cz + Cp) Cz >>> Cp, therefore, we can easily derive Cp to be Cp = K * KVCO = 12.60pF M * c2 * uz Similarly for Cz and Rz Cz = K * KVCO * (uz2 - 1) = Cp * (uz2 - 1) = 189pF M * c2 * uz Rz = M * c * uz2 = 22.48K K * KVCO * (uz2 - 1)
Based on the loop filter parameter equations from above, since there are no possible values of 12.60pF for Cp, 189pF for Cz, and 22.48K for Rz, the next possible values within the loop filter settings are 12.55pF (CP[3:0]=1111), 196.4pF (CZ[3:0]=0111), and 15.3K (RZ[3:0]=1111), respectively. This loop filter setting will yield a loop bandwidth of about 102KHz. The phase margin must be checked for loop stability. m = (360 / 2 ) * [tan-1 (6.41x105 s-1 / 3.33x105 s-1) - tan-1 (6.41x105 s-1 / 5.54x106 s-1)] = 56 Although slightly below 60, the phase margin would be acceptable with a fairly stable loop. 13
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
CONFIGURING THE MULTI-PURPOSE I/Os
The 5V9885 can operate in four distinct modes. These modes are controlled by the MFC bit (0x04) and the I2C/JTAG pin. The general purpose I/O pins (GIN0, GIN1, GIN2, GIN3, GIN4, GIN5) have different uses depending on the mode of operation. The four available modes of operation are: 1) Manual Frequency Control (MFC) Mode for PLL0 Only 2) Manual Frequency Control (MFC) Mode for all three PLLs 3) I2C Programming Mode 4) JTAG Programming Mode Along with the GINx pins are also GOUTx output pins that can take up a different function depending on the mode of operation. See table below for description.
Multi-Purpose Pins GIN0 GIN1 GIN2 GIN3 GIN4 GOUT0 GOUT1 Other Signal Functions SDAT / TDI SCLK / TCK TMS TRST CLK_SEL TDO / LOSS_LOCK LOSS_CLKIN Signal Description I2C serial data input / JTAG serial data input I2C clock input / JTAG clock input JTAG control signal to the TAP controller state machine JTAG active LOW input to asynchronously reset the BST Reference clock select between XTALIN/REFIN and CLKIN JTAG serial data output / Detects loss of PLL lock(1) Detects loss of the selected clock source(1)
NOTE: 1. LOSS_LOCK and LOSS_CLKIN cannot be used as reliable inputs to other devices.
Each PLL's programming registers can store up to four different Dx and Mx configurations in combination with two different P configurations in MFC modes. The post-divider should never be disabled in any of the two P configurations unless the output bank will never be used during normal operation. The PLL's loop filter settings also has four different configurations to store and select from. This will be explained in the MODE1 and MODE2 sections. The use of the GINx pins in MFC mode control the selection of these configurations. MODE1 - Manual Frequency Control (MFC) Mode for PLL0 Only In this mode, only the configuration of PLL0 can be changed during operation.. PLL1 and PLL2 have only one fixed configuration in this mode. The GIN0, GIN1 and GIN2 pins control the selection of up to eight different D0, M0, P, RZ0, CZ0, PZ0, and IP0 stored configurations. GIN3 becomes PLL SUSPEND pin, GIN4 is not available to users, and GIN5 becomes CLK_SEL pin. The output GOUT0 will become an indicator for loss of PLL lock (LOSS_LOCK). GOUT1 pin will become an indicator for loss of the selected clock (LOSS_CLKIN). PLL0 itself only has four different configurations to choose from but in this mode, it borrows two configurations (Config2 and Config3) from both PLL1 and PLL2, to provide eight different stored configurations. PLL1 and PLL2 will still be fully operational but the default configuration will be Config0. The output banks will each have two P configurations that can be associated with each of the PLL configurations. Each of the two P configurations has its own set of PM bits (See the PRE-SCALERS, FEEDBACK-DIVIDERS, POST-DIVIDERS section for more detail on the PM bits). Use the ODIV bit to choose which post-divider configuration to associate with a specific PLL configuration. For example, if ODIV0_CONFIG0=1, then when Config0 is selected Qx[9:0]_CONFIG1 is selected as the postdivider value to be used. Or if ODIV2_CONFIG3 = 0, then when CONFIG7 is selected, Qx[9:0]_CONFIG0 is selected. Note that there is an ODIVx bit for each of the PLL configurations. In this way, the post-divider values can change with the configuration. To enter this mode, users must set MFC bit to "1", and I2C/JTAG pin must be left floating.
GIN2 Pin 0 0 0 0 1 1 1 1 GIN1 Pin 0 0 1 1 0 0 1 1 GIN0 Pin 0 1 0 1 0 1 0 1 PLL0 Configuration Selection (Mode 1) Configuration 0: D0_CONFIG0, M0_CONFIG0, and ODIV0_CONFIG0 Configuration 1: D0_CONFIG1, M0_CONFIG1, and ODIV0_CONFIG1 Configuration 2: D0_CONFIG2, M0_CONFIG2, and ODIV0_CONFIG2 Configuration 3: D0_CONFIG3, M0_CONFIG3, and ODIV0_CONFIG3 Configuration 4: D1_CONFIG2, M1_CONFIG2, and ODIV1_CONFIG2 Configuration 5: D1_CONFIG3, M1_CONFIG3, and ODIV1_CONFIG3 Configuration 6: D2_CONFIG2, M2_CONFIG2, and ODIV2_CONFIG2 Configuration 7: D2_CONFIG3, M2_CONFIG3, and ODIV2_CONFIG3
14
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
MODE2 - Manual Frequency Control (MFC) Mode for all PLLs In this mode, the configuration of PLL0, PLL1, and PLL2 can be changed during operation. The GINx pins are used to control the selection of up to four different Dx, Mx, P, RZx, CZx, CPx, and IPx configurations for each PLL. GIN0 and GIN1 become configuration selection pins for D0 and M0 of PLL0, GIN2 and GIN3 become configuration selection pins for D1 and M1 of PLL1, and GIN4 and GIN5 become configuration selection pins for D2 and M2 of PLL2. The output GOUT0 will become an indicator for loss of PLL lock (LOSS_LOCK). GOUT1 pin will become an indicator for loss of the selected clock (LOSS_CLKIN). The output banks will have two different P configurations to choose from for each of the four PLL configurations. Each of the two P configurations has its own set of PM bits (See the PRE-SCALERS, FEEDBACK-DIVIDERS, POST-DIVIDERS section for more detail on the PM bits). Use the ODIV bit to choose which post-divider configuration to associate with a specific PLL configuration. For example, if ODIV2_CONFIG2=1, then when Config2 is selected Qx[9:0]_CONFIG1 is selected as the post-divider value to be used. Note that there is an ODIVx bit for each of the PLL configurations. In this way, the post-divider values can change with the configuration. To enter this mode, users must set MFC bit to "0", and I2C/JTAG pin must be left floating.
GIN1 Pin 0 0 1 1 GIN0 Pin 0 1 0 1 PLL0 Configuration Selection (Mode 2) Configuration 0 Configuration 1 Configuration 2 Configuration 3 GIN5 Pin 0 0 1 1 GIN4 Pin 0 1 0 1 PLL2 Configuration Selection (Mode 2) Configuration 0 Configuration 1 Configuration 2 Configuration 3
GIN3 Pin 0 0 1 1
GIN2 Pin 0 1 0 1
PLL1 Configuration Selection (Mode 2) Configuration 0 Configuration 1 Configuration 2 Configuration 3
MODE3 - I2C Programming Mode In this mode, GIN0, GIN1, GIN3 and GIN5 become SDAT (I2C data), SCLK (I2C clock), SUSPEND and CLK_SEL signal pins, respectively. The output GOUT0 will become an indicator for loss of PLL lock (LOSS_LOCK). GOUT1 pin will become an indicator for loss of the selected clock (LOSS_CLKIN). GIN2 and GIN4 are not available to users. To enter this mode, I2C/JTAG pin must be set HIGH. MODE4 - JTAG Programming Mode In this mode, GIN0, GIN1, GIN2, GIN3, GIN4 and GIN5 will become TDI (JTAG data in), TCK (JTAG clock), TMS (JTAG control signal), SUSPEND, TRST (JTAG reset) and CLK_SEL signal pins, respectively. The output GOUT0 will become JTAG TDO signal, and GOUT1 will be an indicator for loss of the selected clock (LOSS_CLKIN). To enter this mode, I2C/JTAG pin must be set LOW.
Manual Frequency Control modes Mode2 JTAG GIN0 TDI GIN1 TCK GIN2 TMS GIN3 SUSPEND GIN4 TRST GIN5(1) CLK_SEL LOSS_LOCK TDO LOSS_CLKIN LOSS_CLKIN
Multi-Purpose pins GIN0 GIN1 GIN2 GIN3 GIN4 GIN5 GOUT0 GOUT1
Mode1 GIN0 GIN1 GIN2 SUSPEND n/a CLK_SEL LOSS_LOCK LOSS_CLKIN
I2C SDAT SCLK n/a SUSPEND n/a CLK_SEL LOSS_LOCK LOSS_CLKIN
NOTE: 1. The PLL(s) will lock onto the primary clock and the manual switchover can be controlled by the PRIMCLK bit.
15
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
Understanding the GIN Signals During power up, the part will virtually be in MFC mode2, therefore, the values of GIN4, GIN3, GIN2, GIN1 and GIN0 will be latched and used for PLL configuration selection, regardless of the state of the I2C/JTAG pin. GIN5 is not latched, and will assume the LOW state internally when in programming mode. This means that when in programming mode, the PLL configuration can only be changed by writing directly to the registers of the currently selected configuration. When in MFC mode 2, configuration 0 or 1 (GIN5=0) should be selected if you do not want to change configurations when entering or leaving programming mode. The GIN pins should be held LOW during power up to select configuration0 as default. When not in programming mode, the GIN inputs directly control the selected configuration. The internal GINx signals can be individually disabled via programming the GINEN bits (0x06). When disabled by setting GINENx to "0", the GINx inputs may be left floating, but during power up, the GIN pins will still latch. Disabled inputs are interpreted as LOW by the internal state machines. Even if disabled, GIN2, GIN1, GIN0 and GIN4 pins will be enabled if required for I2C or JTAG programming functions when in programming mode. The SUSPEND and CLK_SEL functions on the GIN3 and GIN5 pins, respectively, will be rendered completely non-functional when disabled.
SHUTDOWN/SUSPEND/ENABLE OF OUTPUTS
There are two external pins along with internal bits that control the enabling/disabling of the output banks. The two pins are the SHUTDOWN/OE pin and the GIN3/SUSPEND pin. The SHUTDOWN/OE pin can be programmed to function as an output enable or global shutdown. The polarity of the SHUTDOWN/ OE signal pin can be programmed to be either active HIGH or LOW with the SP bit (0x1C). When SP is "0", the pin becomes active HIGH and when SP is "1", the pin becomes active LOW. The SH bit(0x1C) determines the function of the SHUTDOWN/OE signal pin. If SH is "1", the signal pin is SHUTDOWN and functions as a global shutdown. This will override the OEx (0x1C), OSx (0x1D), and PLLSx (0x1E) bits. If SH is "0", the signal pin is OE and functions as an enable/disable of the output banks. If used as an output enable/disable, each output bank can be individually programmed to be enabled or disabled by the OE pin.by setting OEx bits to "1". If the OE signal pin is asserted, the output banks that has their corresponding OEx bit set to "1" will be disabled. The OEMx bits determine the outputs' disable state. When set to "0x" the outputs will be tristated. When set to "10", the outputs will be pulled low. When set to "11", the outputs will be pulled high. Inverted outputs will be parked in the opposite state. If the OEx bits are set to "0", the states of the corresponding output banks will not be impacted by the state of the OE pin. To individually enable/disable via programming instead of the OE pin, hard wire the OE pin to Vdd or GND (depending if it is active HIGH or LOW) as if to disable the outputs. Then toggle the OEx bits to either "0" to enable or "1" to disable. When the chip is in shutdown, the outputs, the reference oscillator, and the I2C /JTAG pin are powered down. The outputs will be tristated and the I2C /JTAG pin will be set to MFC mode (MID level). Programming will not be allowed. The GINx pins and clock inputs remain operational. The PLL is not disabled. The SHUTDOWN pin must be reasserted in order to program the part or to resume operation. The GIN3/SUSPEND pin, when used as a SUSPEND function, can be used to power down the PLL and/or output banks.. Each output bank can be individually programmed to be enabled or disabled by the SUSPEND signal pin by setting the OSx bits to "1". If the SUSPEND signal pin is asserted, the output banks that has their corresponding OSx bit set to "1" will be powered down and outputs tristated. If the OSx bits are set to "0", the states of the corresponding output banks will not be impacted by the state of the SUSPEND pin. There is also an option to suspend individual PLLs by setting the PLLSx bits (0x1E) to "1". This will associate the PLL to the SUSPEND pin. When the pin is asserted, the corresponding PLLs will be powered down. It will not only power down the PLL but also any output bank associated with it. The PLLSx bits will override the OSx bits. In the event of a PLL suspend, the PLL must achieve lock again after it has been re-enabled, In the event of a global shutdown, the PLL does not have to re-acquire lock since it is not disabled.
16
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
MANUAL FREQUENCY CONTROL (MFC) BLOCK DIAGRAM
OUTPUT MUX
PLL0 Prescaler "D" CONFIG0 CONFIG1 CONFIG2 CONFIG3 Multiplier "M" CONFIG0 CONFIG1 CONFIG2 CONFIG3 ODIV ODIV ODIV ODIV ODIV VCO Output Divider P2 CONFIG0 CONFIG1
Output Divider P3 CONFIG0 CONFIG1
PLL1 Prescaler "D" CONFIG0 CONFIG1 CONFIG2 CONFIG3 Multiplier "M" CONFIG0 CONFIG1 CONFIG2 CONFIG3 ODIV ODIV ODIV ODIV VCO
ODIV
PLL2 Prescaler "D" CONFIG0 CONFIG1 CONFIG2 CONFIG3 Multiplier "M" CONFIG0 CONFIG1 CONFIG2 CONFIG3 ODIV ODIV ODIV ODIV VCO
MFC = 0
NOTES: This illustration shows how the configurations are arranged for each PLL. There is an ODIV bit associated with each of the four configurations. - GIN0 and GIN1 control four configurations from PLL0. - GIN2 and GIN3 control four configurations from PLL1. - GIN4 and GIN4 control four configurations from PLL2. - ODIV from each configuration determines the selection of two Output Divider Px Configurations.
17
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
MANUAL FREQUENCY CONTROL (MFC) BLOCK DIAGRAM
OUTPUT MUX
PLL0 Prescaler "D" CONFIG0 CONFIG1 CONFIG2 CONFIG3 Multiplier "M" CONFIG0 CONFIG1 CONFIG2 CONFIG3 ODIV ODIV ODIV ODIV ODIV VCO Output Divider P2 CONFIG0 CONFIG1
Output Divider P3 CONFIG0 CONFIG1
PLL1 Prescaler "D" CONFIG0 VCO CONFIG4 CONFIG5 Multiplier "M" CONFIG0 ODIV
ODIV
CONFIG4 CONFIG5
ODIV ODIV
PLL2 Prescaler "D" CONFIG0 VCO CONFIG6 CONFIG7 Multiplier "M" CONFIG0 ODIV
CONFIG6 CONFIG7
ODIV ODIV
MFC = 1
NOTES: This illustration shows how the configurations are arranged for PLL0. Config_4 and Config_5 are taken from PLL1, and Config_6 and Config_7 are taken from PLL2. There is an ODIV bit associated with each of the four configurations. - GIN0, GIN1, and GIN2 control eight shaded configurations for PLL0. - ODIV from each configuration determines the selection of two Output Divider Px Configurations.
18
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
BLOCK DIAGRAM FOR SHUTDOWN/OE CONTROL SIGNAL
OUT1
PM2 OE1
01 10
/2
/2
OUT2
Q2
+2
11
OE2
01 10
/2
/2
OUT3
Q3
+2
11
OE3 PM3
OUT4 MUX
01 10
/2
/2
Q4
+2
11
OUT4
PM4 OE4
PM5
OUT5
01 10
/2
/2
Q5
+2
11
OUT5
PM6
OE5
01 10
/2
/2
OUT6
Q6
+2
11
OE6
OE MODE SHUTDOWN/OE Global SHUTDOWN Mode: Assert to Shutdown power on the outputs and 3-Level Pin SP SH
NOTE: This illustration shows the internal logic behind the SHUTDOWN/OE pin and the bits associated with it.
19
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
POWER UP AND POWER SAVING FEATURES
If a global shutdown is enabled, SHUTDOWN pin asserted, most of the chip except for the PLLs will be powered down. In order to have a complete power down of the chip, the PLLs must be powered down via the SUSPEND function or by setting the pre-scaler bits to '0x00' and disable the internal GINx signals via the enable bits at memory address 0x05. Note that the register bits will not lose their state in the event of a chip power-down. The only possibility that the register bits will lose their state is if the part was power-cycled. After coming out of shutdown mode, the PLLs will require time to relock. During power up, the values of GIN4, GIN3, GIN2, GIN1 and GIN0 will be latched and used for PLL configuration selection, regardless of the state of the I2C/ JTAG pin and GINx being disabled via the GINENx bits. GIN5 will have an internal state of LOW. The GIN pins should be held LOW during power up to select configuration0 as default. The output levels will be at an undefined state during power up. The post-divider should never be disabled via PM bits after power up, or else it will render the output bank completely non-functional during normal operation, (unless the output bank itself will not be used at all). During power up, the VDD ramp must be monotonic.
LOSS OF LOCK AND INPUT CLOCK
The device employs a loss of lock and loss of input clock detection circuitry. The GIN0/LOSS_LOCK and GIN1/LOSS_CLKIN are the outputs that indicate such failures. LOSS_LOCK signal will be asserted if any of the three powered up PLLs loses frequency lock for any event other than PLL shutdown. Lock is determined by checking that the reference and feedback clocks are within 1/2 period of each other. LOSS_LOCK is also asserted for at least two clock cycles of the newly selected clock when switching over to a different clock source (manual or automatic). LOSS_CLKIN is asserted when the currently selected clock is lost or is asserted when both clocks are lost. In the event of the selected clock being absent up on power up, the loss of the selected clock detection circuitry will reference an internal oscillator. LOSS_LOCK and LOSS_CLKIN cannot be used as reliable inputs to other devices.
SWITCHOVER MODES
The IDT5V9888 features redundant clock inputs which supports both Automatic and Manual switchover mode. These two modes are determined by the configuration bits, SM (0x34). The primary clock source can be programmed, via the PRIMCLK bit, to be either XTALIN/REFIN or CLKIN, which is determined by the PRIMCLK bit. The other clock source input will be considered as the secondary source. This is more detailed in the 'REFERENCE CLOCK INPUT PINS AND SELECTION'. Note that the switchover modes are asynchronous. If the reference clocks are directly routed to OUTx with no phase relationship, short pulses can be generated during switchover. The automatic switchover mode will work only when the primary clock source is XTALIN/REFIN. MANUAL SWITCHOVER MODE When SM[1:0] is "0x", the redundant inputs are in manual switchover mode. In this mode, CLK_SEL pin is used to switch between the primary and secondary clock sources. As previously mentioned, the primary and secondary clock source setting is determined by the PRIMCLK bit. During the switchover, no glitches will occur at the output of the device, although there may be frequency and phase drift, depending on the exact phase and frequency relationship between the primary and secondary clocks. The LOSS_LOCK signal will be asserted for a minimum of two input clock cycles of the newly selected clock, even if the two inputs are exactly in phase. GOUT1 is used as LOSS_CLKIN, which indicates the loss of the currently used selected clock. AUTOMATIC SWITCHOVER MODE When SM[1:0] is "1x", the redundant inputs are in automatic switchover mode. Automatic switchover mode supports both revertive and non-revertive functionalities. These two functions are determined by the SM bits being set to "10" for non-revertive and "11" for revertive. Non-Revertive The input clock selection will switch to the secondary clock source when there are no transitions on the primary clock source for two secondary clock cycles. LOSS_LOCK and LOSS_CLKIN signals will be asserted for a minimum of two secondary clock cycles. LOSS_LOCK will remain asserted until the PLL achieves lock, as previously defined, to the new input clock. If there are no transitions on both clock sources, the LOSS_LOCK signal and LOSS_CLKIN signal will be asserted. In this mode, once the secondary clock is selected, it will not automatically re-select the primary clock as the input clock, even if the secondary clock goes away and the primary clock is functional. The CLK_SEL pin must be toggled to re-select the primary clock source as the input clock.
20
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
Revertive The input clock selection will switch to the secondary clock source when there are no transitions on the primary clock source for two secondary clock cycles. LOSS_LOCK and LOSS_CLKIN signals will be asserted. LOSS_LOCK will remain asserted until the PLL achieves lock, as previously defined, to the new input clock. If there are no transitions on both clock sources, the LOSS_LOCK signal and LOSS_CLKIN signal will be asserted. After a stable and valid primary clock source is present for either 8 or 1024 primary clock cycles, the input clock selection will automatically switch back to the primary clock source and LOSS_CLKIN signal will be deasserted. The CLK_SEL pin can be left floating in this auto-revertive mode. The OKC bit (0x1D) determines the number of valid primary clock cycles of either 8 or 1024 before switching back to the primary clock source. If OKC is set to "0", the primary clock will be re-selected as the input clock if the primary clock is present for 8 primary clock cycles. If OKC is set to "1", the re-select threshold is 1024 primary clock cycles. (Actual switchover times will vary.) Note that both clock inputs must be at the same frequency in order for the auto-revertive switchover to function properly. If both reference clocks are at different frequencies, the device will always remain on the primary clock unless it is absent for two secondary clock cycles. In all switchover modes, LOSS_LOCK signal is asserted for at least two input clock cycles of the newly selected clock when switching clock sources (manually or automatic).
CLOCK SWITCH MATRIX AND OUTPUTS
All three PLL outputs and the currently selected input clock source are routed into and through a clock matrix. The user is able to select which PLL output and clock source is routed to which output bank via the SRCx bits (0x34, 0x35). Each output bank has its own set of SRC bits. Refer to the RAM table for more information. Note that OUT1 will be based off the reference clock and the only output bank toggling under the default RAM bit settings. Outputs 1, 2 and 3 are 3.3V LVTTL. Outputs banks 4 and 5 can be 3.3V LVTTL, LVPECL or LVDS. The LVDS and LVPECL selection is determined by the LVLx bits (0x54, 0x58). Each output bank has individual slew-rate control (SLEWx bits). Each output can be individually inverted (INVx bits); when using LVPECL or LVDS modes, one of the outputs in each LVPECL/LVDS pair should be inverted. All output banks except OUT1 have a programmable 10-bit postdivider (Qx bits) with two selectable divide configurations via the ODIVx bits. There are four settings for the programmable slew rate, 0.7V/ns, 1.25V/ns, 2V/ns, and 2.75V/ns; this only applies to the 3.3V LVTTL outputs. The differential outputs are not slew rate programmable in LVPECL or LVDS modes. SLEW4 and/or SLEW5 must be set to 2.75V/ns for stable output operation . For LVTTL output frequency rates higher than 100MHz, a slew rate of 2V/ns or greater should be selected. The post-dividers can be disabled using the PMx bit, which is described in the PRE-SCALER, FEEDBACK-DIVIDER, AND POST-DIVIDER section. Each output can also be enabled/disabled, which is described in the 'SHUTDOWN/SUSPEND/ENABLE of OUTPUTS' section. Refer to the RAM table for all binary settings.
HIGH LEVEL BLOCK DIAGRAM FOR CONFIGURATION SCHEME
I/Os Non-Volatile Configuration PLLs and Control Blocks EEPROM Cell
I/Os
Volatile Configuration I 2C or JTAG interface Write Enable Programming Interface Block
NOTE: Diagram does not represent actual number of die on chip.
21
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
PROGRAMMING THE DEVICE
I2C and JTAG may be used to program the 5V9885. The I2C/JTAG pin selects the I2C when HIGH and JTAG when LOW. Note that the TRST pin needs to be LOW for I2C mode. Hardwired Parameters for the IDT5V9885 JTAG identification number = 32'b0000_0000001110101100_00000110011_1 Device (slave) address = 7'b1101010 ID Byte for the 5V9885 = 8'b00010000 I2C PROGRAMMING The 5v9885 is programmed through an I2C-Bus serial interface, and is an I2C slave device. The read and write transfer formats are supported. The first byte of data after a write frame to the correct slave address is interpreted as the register address; this address auto-increments after each byte written or read. The frame formats are shown below.
SDA
SDA
SCL P Data Frame Data is stable during clock HIGH
SCL S
Start Condition
Stop Condition
Figure 1: Framing
Each frame starts with a "Start Condition" and ends with an "End Condition". These are both generated by the Master device.
MSB 1 1 0 1 0 1 0 R/W 7-bit slave address LSB
R/W 0 - Slave will be written by master 1 - Slave will be read by master
ACK from Slave
The first byte transmitted by the Master is the Slave Address followed by the R/W bit. The Slave acknowledges by sending a "1" bit.
Figure 2: First Byte Transmittetd on I2C Bus
22
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
EXTERNAL I2C INTERFACE CONDITION KEY: From Master to Slave
4321 4321 4321
From Master to Slave, but can be omitted if followed by the correct sequence Normally data transfer is terminated by a STOP condition generated by the Master. However, if the Master still wishes to communicate on the bus, it can generate a repeated START condition, and address another Slave address without first generating a STOP condition. From Slave to Master
SYMBOLS: ACK - Acknowledge (SDA LOW) NACK - Not Acknowledge (SDA HIGH) Sr - Repeated Start Condition S - START Condition P - STOP Condition
PROGWRITE
S
Address 7-bits
R/W 0
ACK Command Code ACK 1-bit 8-bits: xxxxxx00 1-bit
Register 8-bits
ACK 1-bit
Data ACK 8-bits 1-bit
P
Figure 3: Progwrite Command Frame Writes can continue as long as a Stop condition is not sent and each byte will increment the register address.
PROGREAD Note: If the expected read command is not from the next higher register to the previous read or write command, then set a known "read" register address prior to a read operation by issuing the following command:
S
Address 7-bits
R/W 0
ACK Command Code ACK 1-bit 8-bits: xxxxxx00 1-bit
Register 8-bits
ACK 1-bit
P
Figure 4a: Prior to Progread Command Set Register Address The user can ignore the STOP condition above and use a repeated START condition instead, straight after the slave acknowledgement bit (i.e., followed by the Progread command):
Sr Address 7-bits
R/W 1
ACK 1-bit
ID Byte 8 bits
ACK Data_1 ACK Data_2 ACK Data_last NACK P 1-bit 8-bits 1-bit 8-bits 1-bit 8-bits 1-bit
Figure 4b: Progread Command Frame Note: Figure 4b above by itself is the Progread command format. The ID byte for the 5V9885 is 10hex. Each byte recieved increments the register address. 23
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
PROGSAVE
S Address 7-bits R/W 0 ACK Command Code ACK 1-bit 8-bits:xxxxxx01 1-bit P
JTAG INSTRUCTION REGISTER DESCRIPTION
IR (3) 0 0 0 0 0 0 0 0 1 1 1 IR (2) 0 0 0 0 1 1 1 1 0 0 1 IR (1) 0 0 1 1 0 0 1 1 0 0 1 IR (0) 0 1 0 1 0 1 0 1 0 1 1 Instructions EXTEST(1) SAMPLE/PRELOAD(1) IDCODE(1) REGADDR(2) REGDATAW / PROGWRITE(3) REGDATAR / PROGREAD(4) PROGSAVE (5) PROGRESTORE(6) CLAMP(1) HIGHZ(1,7) BYPASS (1)
NOTE: PROGWRITE is for writing to the 5v9885 registers. PROGREAD is for reading the 5v9885 registers. PROGSAVE is for saving all the contents of the 5v9885 registers to the EEPROM. PROGRESTORE is for loading the entire EEPROM contents to the 5v9885 registers.
PROGRESTORE
S Address 7-bits R/W 0 ACK Command Code ACK 1-bit 8-bits:xxxxxx10 1-bit P
JTAG INTERFACE In addition to the IEEE 1149.1 instructions EXTEST, SAMPLE/PRELOAD, CLAMP, HIGH-Z and BYPASS, the 5V9885 allows access to internal programming registers using the REGADDR (set register address), REGDATAR (read register) and REGDATW (write register instructions. Data is always accessed by byte, and the register address increments after each read or write. The full instruction set follows. The IDT5V9885 will be updating the registers during programming. The JTAG TAP controller can be reset in one of four ways: 1) Power up in JTAG mode 2) Power up in I2C mode and then go into JTAG mode, or go out of and back into JTAG mode with the I2C/JTAG pin 3) Apply TRST while in JTAG mode 4) Apply five rising edges of TCK with TMS high while in JTAG mode
NOTES: 1. IEEE 1149.1 definition 2. REGADDR is for setting a specific 5v9885 register address. 3. REGDATAW/PROGWRITE is for writing to the 5v9885 registers. 4. REGDATAR/PROGREAD is for reading the 5v9885 registers. 5. PROGSAVE is for saving all the contents of the 5v9885 registers to the EEPROM. 6. PROGRESTORE is for loading the entire EEPROM contents to the 5v9885 registers. 7. The OEMs bits for OUT1-6 must be set for tri-state when using the HIGHZ instruction
EEPROM INTERFACE The IDT5V9885 can also store its configuration in an internal EEPROM. The contents of the device's internal programming registers can be saved to the EEPROM by issuing a save instruction (ProgSave) and can be loaded back to the internal programming registers by issuing a restore instruction (ProgRestore). To initiate a save or restore using I2C, only two bytes are transferred. The Device Address is issued with the read/write bit set to "0", followed by the appropriate command code. The save or restore instruction executes after the STOP condition is issued by the Master, during which time the IDT5V9885 will not generate Acknowledge bits. The 5V9885 will acknowledge the instructions after it has completed execution of them. During that time, the I2C bus should be interpreted as busy by all other users of the bus. Using JTAG, the ProgSave and ProgRestore instructions selects the BYPASS register path for shifting the data from TDI to TDO during the data register scanning. During the execution of a ProgSave or ProgRestore instruction, the IDT5V9885 will not accept a new programming instruction (read, write, save, or restore). All non-programming JTAG instructions will function properly, but the user should wait until the save or restore is complete before issuing a new programming instruction. If a new programming instruction is issued before the save or restore completes, the new instruction is ignored, and the BYPASS register path remains in effect for shifting data from TDI to TDO during data register scanning. The time it takes for the save (TSAVE) and restore (TRESTORE) instructions to complete is: TSAVE = 100ms max, TRESTORE = 10 ms max
24
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
In order for the save and restore instructions to function properly, the IDT5V9885 must not be in shutdown mode (SHUTDOWN pin asserted). In the event of an interrupt of some sort such as a power down of the part in the middle of a save or restore operation, the contents to or from the EEPROM will be partially loaded, and a CRC error will be generated. The CERR bit (0x81) will be asserted to indicate that an error has occurred. The LOSS_LOCK signal will also be asserted. On power-up of the IDT5V9885, an automatic restore is performed to load the EEPROM contents into the internal programming registers. The auto-restore will not function properly if the device is in shutdown mode (SHUTDOWN pin asserted). The IDT5V9885 will be ready to accept a programming instruction once it acknowledges its 7-bit I2C address.
tTCLK t4 t1 TCLK t3 TDI/TMS tDS tDH t2
TDO t6 TRST t5 tDO
TDO
Standard JTAG Timing
NOTE: t1 = tTCLKLOW t2 = tTCLKHIGH t3 = tTCLKFALL t4 = tTCLKRISE t5 = tRST (reset pulse width) t6 = tRSR (reset recovery)
JTAG AC ELECTRICAL CHARACTERISTICS
Symbol tTCLK tTCLKHIGH tTCLKLOW tTCLKRISE tTCLKFALL tRST tRSR Parameter JTAG Clock Input Period JTAG Clock HIGH JTAG Clock Low JTAG Clock Rise Time JTAG Clock Fall Time JTAG Reset JTAG Reset Recovery Min. 100 40 40 -- -- 50 50 Max. -- -- -- 5(1) 5(1) -- -- Units ns ns ns ns ns ns ns
SYSTEM INTERFACE PARAMETERS
Symbol tDO tDOH tDS tDH Parameter Data Output(1) Data Output Hold(1) Data Input, tRISE = 3ns Data Input, tFALL = 3ns Min. -- 0 10 10 Max. 20 -- -- -- Units ns ns ns ns
NOTE: 1. 50pF loading on external output signals.
NOTE: 1. Guaranteed by design.
25
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
I2C BUS DC CHARACTERISTICS
Symbol VIH VIL VHYS IIN VOL Parameter Input HIGH Level Input LOW Level Hysteresis of Inputs Input Leakage Current Output LOW Voltage Conditions Min 0.7 * VDD 0.05 * VDD IOL = 3 mA 1.0 0.4 Typ Max 0.3 * VDD Unit V V V A V
I2C BUS AC CHARACTERISTICS FOR STANDARD MODE
Symbol FSCLK tBUF tSU:START tHD:START tSU:DATA tHD:DATA tOVD CB tR tF tHIGH tLOW tSU:STOP Parameter Serial Clock Frequency (SCLK) Bus free time between STOP and START Setup Time, START Hold Time, START Setup Time, data input (SDAT) Hold Time, data input (SDAT)(1) Output data valid from clock Capacitive Load for Each Bus Line Rise Time, data and clock (SDAT, SCLK) Fall Time, data and clock (SDAT, SCLK) HIGH Time, clock (SCLK) LOW Time, clock (SCLK) Setup Time, STOP 4 4.7 4 Min 0 4.7 4.7 4 250 0 3.45 400 1000 300 Typ Max 100 Unit KHz s s s ns s s pF ns ns s s s
NOTE: 1. A device must internally provide a hold time of at least 300ns for the SDAT signal (referred to the VIHMIN of the SCLK signal) to bridge the undefined region of the falling edge of SCLK.
I2C BUS AC CHARACTERISTICS FOR FAST MODE
Symbol FSCLK tBUF tSU:START tHD:START tSU:DATA tHD:DATA tOVD CB tR tF tHIGH tLOW tSU:STOP Parameter Serial Clock Frequency (SCLK) Bus free time between STOP and START Setup Time, START Hold Time, START Setup Time, data input (SDAT) Hold Time, data input (SDAT)(1) Output data valid from clock Capacitive Load for Each Bus Line Rise Time, data and clock (SDAT, SCLK) Fall Time, data and clock (SDAT, SCLK) HIGH Time, clock (SCLK) LOW Time, clock (SCLK) Setup Time, STOP 20 + 0.1 * CB 20 + 0.1 * CB 0.6 1.3 0.6 Min 0 1.3 0.6 0.6 100 0 0.9 400 300 300 Typ Max 400 Unit KHz s s s ns s s pF ns ns s s s
NOTE: 1. A device must internally provide a hold time of at least 300ns for the SDAT signal (referred to the VIHMIN of the SCLK signal) to bridge the undefined region of the falling edge of SCLK.
26
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
ABSOLUTE MAXIMUM RATINGS(1)
Symbol VDD VI VO TJ TSTG Description Internal Power Supply Voltage Input Voltage Output Voltage
(2)
Max -0.5 to +4.6 -0.5 to +4.6 -0.5 to VDD + 0.5 150 -65 to +150
Unit V V V C C
Junction Temperature Storage Temperature
NOTE: 1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. 2. Not to exceed 4.6V.
CAPACITANCE (TA = +25C, f = 1MHz, VIN = 0V)(1)
Symbol CIN XTAL_FREQ XTAL_MIN XTAL_MAX XTAL_VPP Crystal Specifications Crystal Frequency Minimum Crystal Load Capacitance Maximum Crystal Load Capacitance Crystal Load Capacitance Resolution Voltage Swing (peak-to-peak, nominal)
NOTE: 1. Capacitance levels characterized but not tested.
Parameter Input Capacitance
Min. -- 8 -- -- -- --
Typ. 4 -- 3.5 35.4 0.125 2.3
Max. -- 50 -- -- -- --
Unit pF MHz pF pF V
RECOMMENDED OPERATING CONDITIONS
Symbol VDD TA CLOAD_OUT FIN tPU Description Power Supply Voltage for LVTTL Power Supply Voltage for LVDS/LVPECL Operating Temperature, Ambient Maximum Load Capacitance (LVTTL only) External Reference Crystal External Reference Clock, Industrial Power-up time for all VDDs to reach minimum specified voltage (power ramps must be monotonic) Min. 3 3.135 -40 -- 8 1 0.05 Typ. 3.3 3.3 -- -- -- -- -- Max. 3.6 3.465 +85 15 50 400 5 Unit V C pF MHz ms
27
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Symbol VIHH VIMM VILL I3 IDD IDDS Parameter Input HIGH Voltage Level(1) Input MID Voltage Level(1) Input LOW Voltage Level(1) 3-Level Input DC Current Total Power Supply Current (3.3V Supply, VDD) Total Power Supply Current in Shutdown Mode(2) Test Conditions I2C/JTAG 3-Level Input I2C/JTAG 3-Level Input I2C/JTAG 3-Level Input HIGH Level VIN = VDD VIN = VDD/2 MID Level VIN = GND LOW Level 2 outputs @166MHz; 4 outputs @ 83MHz 2 outputs @20MHz; 4 outputs @ 40MHz Global Shutdown Mode (PLLs, dividers, outputs, etc. powered down) Min. VDD - 0.4 VDD/2 - 0.2 -- -- -50 -200 -- -- -- Typ. -- -- -- -- -- -- 120 40 2 Max. -- VDD/2 + 0.2 0.4 200 +50 -- -- -- -- Unit V V V A mA mA
NOTES: 1. These inputs are normally wired to VDD, GND, or left floating. If these inputs are switched dynamically after powerup, the function and timing of the outputs may be glitched, and the PLL may require additional tAQ time before all datasheet limits are achieved. 2. Dividers must reload reprogrammed values via power-on reset or terminal count reload in order to ensure low-power mode.
DC ELECTRICAL CHARACTERISTICS FOR 3.3V LVTTL(1)
Symbol IOH IOL VIH VIL IIH IIL IOZD Parameter Output HIGH Current Output LOW Current Input Voltage HIGH Input Voltage LOW Input HIGH Current Input LOW Current Output Leakage Current Test Conditions VOH = VDD - 0.5, VDD = 3.3V 0.3V VOL = 0.5V, VDD = 3.3V 0.3V Min. 12 12 2 -- -- -- -- Typ. 24 24 -- -- -- -- -- Max. -- -- -- 0.8 10 10 10 Unit mA mA V V A A A
VIN = VDD VIN = 0V 3-state outputs
NOTE: 1. See RECOMMENDED OPERATING RANGE table.
POWER SUPPLY CHARACTERISTICS FOR LVTTL OUTPUTS
Symbol IDDQ IDDD Parameter Quiescent VDD Power Supply Current Dynamic VDD Power Supply Current per Output Total Power VDD Supply Current Test Conditions REF = LOW Outputs enabled, All outputs unloaded VDD = Max., CL = 0pF FREFERENCE CLOCK = 33MHz, CL = 15pf ITOT FREFERENCE CLOCK = 133MHz, CL = 15pf FREFERENCE CLOCK = 200MHz, CL = 15pf Typ. 6 40 26 80 112 Max 12 60 40 120 170 mA Unit mA A/MHz
28
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS FOR LVDS
Symbol VOT (+) VOT (-) VOT VOS VOS IOS IOSD Parameter Differential Output Voltage for the TRUE binary state Differential Output Voltage for the FALSE binary state Change in VOT between Complimentary Output States Output Common Mode Voltage (Offset Voltage) Change in VOS between Complimentary Output States Outputs Short Circuit Current, VOUT+ or VOUT- = 0V or VDD Differential Outputs Short Circuit Current, VOUT+ = VOUTMin. 247 -247 -- 1.125 -- -- -- Typ. -- -- -- 1.2 -- 9 6 Max 454 -454 50 1.375 50 24 12 Unit mV mV mV V mV mA mA
POWER SUPPLY CHARACTERISTICS FOR LVDS OUTPUTS(1)
Symbol IDDQ IDDD Parameter Quiescent VDD Power Supply Current Dynamic VDD Power Supply Current per Output Total Power VDD Supply Current Test Conditions(2) REF = LOW Outputs enabled, All outputs unloaded VDD = Max., CL = 0pF FREFERENCE CLOCK = 100MHz, CL = 5pf ITOT FREFERENCE CLOCK = 200MHz, CL = 5pf FREFERENCE CLOCK = 400MHz, CL = 5pf Typ. 68 30 86 100 122 Max 90 45 130 150 190 mA Unit mA A/MHz
NOTES: 1. Output banks 4 and 5 are toggling. Other output banks are powered down. 2. The termination resistors are excluded from these measurements.
DC ELECTRICAL CHARACTERISTICS FOR LVPECL
Symbol VOH VOL VSWING Parameter Output Voltage HIGH, terminated through 50 tied to VDD - 2V Output Voltage LOW, terminated through 50 tied to VDD - 2V Peak to Peak Output Voltage Swing Min. VDD - 1.2 VDD - 1.95 0.55 Typ. -- -- -- Max VDD - 0.9 VDD - 1.61 0.93 Unit V V V
POWER SUPPLY CHARACTERISTICS FOR LVPECL OUTPUTS(1)
Symbol IDDQ IDDD Parameter Quiescent VDD Power Supply Current Dynamic VDD Power Supply Current per Output Total Power VDD Supply Current Test Conditions(2) REF = LOW Outputs enabled, All outputs unloaded VDD = Max., CL = 0pF FREFERENCE CLOCK = 100MHz, CL = 5pf ITOT FREFERENCE CLOCK = 200MHz, CL = 5pf FREFERENCE CLOCK = 400MHz, CL = 5pf Typ. 86 35 120 130 140 Max 110 50 180 190 210 mA Unit mA A/MHz
NOTES: 1. Output banks 4 and 5 are toggling. Other output banks are powered down. 2. The termination resistors are excluded from these measurements.
29
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
AC TIMING ELECTRICAL CHARACTERISTICS
(SPREAD SPECTRUM GENERATION = OFF)
Symbol fIN 1/t1 fVCO fPFD fBW t2 t3 Parameter Input Frequency Output Frequency VCO Frequency PFD Frequency Loop Bandwidth Input Duty Cycle Output Duty Cycle Slew Rate SLEWx(bits) = 00 Slew Rate SLEWx(bits) = 01 Slew Rate SLEWx(bits) = 10 Slew Rate SLEWx(bits) = 11 Rise Times Fall Times Rise Times Fall Times Output three-state Timing Clock Jitter(3,7) Output Skew Lock Time Lock time(8) Test Conditions Input Frequency Limit Single Ended Clock output limit (LVTTL) Differential Clock output limit (LVPECL/ LVDS) VCO operating Frequency Range PFD operating Frequency Range Based on loop filter resistor and capacitor values Duty Cycle for Input Measured at VDD/2, FOUT 200MHz Measured at VDD/2, FOUT > 200MHz Single-Ended Output clock rise and fall time, 20% to 80% of VDD (Output Load = 15pf) Single-Ended Output clock rise and fall time, 20% to 80% of VDD (Output Load = 15pf) Single-Ended Output clock rise and fall time, 20% to 80% of VDD (Output Load = 15pf) Single-Ended Output clock rise and fall time, 20% to 80% of VDD (Output Load = 15pf) LVDS, 20% to 80% LVPECL, 20% to 80% Time for output to enter or leave three-state mode after SHUTDOWN/OE switches Peak-to-peak period jitter, fPFD > 20MHz CLK outputs measured at VDD/2 fPFD < 20MHz Skew between output to output on the same bank (bank 4 and bank 5 only)(4, 5) PLL Lock Time from Power-up(6) PLL Lock time from shutdown mode Min. 1(1) 0.0049 0.0049 10 0.4(1) 0.03 40 45 40 -- -- -- -- -- -- -- -- -- -- -- -- -- -- Typ. -- -- -- -- -- -- -- -- -- 2.75 2 1.25 0.75 850 850 500 500 -- -- 200 -- 10 20 Max 400 200 500 1200 400 40 60 55 60 -- -- V/ns -- -- -- -- -- -- 150 + 1/FOUTX 150 -- 150 20 100 Unit MHz MHz MHz MHz MHz % %
t4(2)
t5
ps
t6 t7 t8 t9 t10
ns ps ps ms s
NOTES: 1. Practical lower input frequency is determined by loop filter settings. 2. A slew rate of 2V/ns or greater should be selected for output frequencies of 100MHz and higher. 3. Input frequency is the same as the output with all output banks running at the same frequency. 4. Skew measured between all in-phase outputs in the same bank. 5. Skew measured between the cross points of all differential output pairs under identical input and output interfaces, transitions and load conditions on any one device. 6. Includes loading the configuration bits from EEPROM to PLL registers. It does not include EEPROM programming/write time. 7. Guaranteed by design but not production tested. 8. Actual PLL lock time depends on the loop configuration.
SPREAD SPECTRUM GENERATION SPECIFICATIONS
Symbol fIN fMOD fSPREAD Parameter Input Frequency Mod Freq Spread Value Description Input Frequency Limit Modulation Frequency Amount of Spread Value (Programmable) - Down Spread Amount of Spread Value (Programmable) - Center Spread Min. 1(1) -- Typ. Max -- 400 33 -- -0.5, -1, -2.5, -3.5, -4 -0.5 to +0.5 Unit MHz kHz %fOUT
NOTE: 1. Practical lower input frequency is determined by loop filter settings.
30
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND CONDITIONS(1)
VDD 0.1F
CLKOUT OUTPUTS CLOAD
GND
NOTE: 1. All VDD pins must be tied together.
Test Circuits for DC Outputs
OTHER TERMINATION SCHEME (BLOCK DIAGRAM)
CLOAD CLKOUT OUTPUTS CLOAD OUTPUTS RLOAD CLKOUT CLOAD GND GND CLKOUT
LVTTL: -15pF for each output
LVDS: - 100 between differential outputs with 5pF
VDD-2V RLOAD CLOAD CLKOUT OUTPUTS CLKOUT CLOAD GND RLOAD VDD-2V
LVPECL: - 50 to VDD-2V for each output with 5pF 31
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
RAM (PROGRAMMING REGISTER) TABLES
BIT # (Default Settings) BIT # ADDR 7 6 5 4 3 2 1 0
Default Register Hex Value
7
6
5
4
3
2
1
0
DESCRIPTION
0x00
0x01
Reserved Bits. No Register Exists programming Should be ignored in
0x02
0x03
0x04
0
0
0
0
0
0
0
0
00
MFC
MFC=Manual Frequency Control Mode ('0'=All PLL Control (Default), "1"=PLL0 Control Only ); GINEN0 to GINEN5=GINx Pins Enable Bits, ("1"=Enable (Default), "0"=No Connect (Internal State will be "Low")); Address 0x04, Bits[7:1] are reserved and should bet set to "0". Address 0x05, Bits 7, 6 are reserved and should be set to "1'.
0x05
1
1
1
1
1
1
1
1
FF
GINEN5
GINEN4
GINEN3
GINEN2
GINEN1
GINEN0
0x06
0
0
1
1
0
0
0
0
30
XDRV[1:0]
XDRV=crystal drive strength ("00" = 1.4V, "01" = 2.3V, "10"= 3.2V pk-pk swing typical, "11"=XTAL_IN with external clock-default); When "11", XTALCAP[7:0] value must also be set to "0". Bits 7,6, 3, 2, 1, 0 are reserved and should be set to "0" XTAL load cap = 3.5pF+ (0.125 x XTALCAP[7:0]) , 3.5pF to 35.4pF; Each XTAL pin to GND; (For example, "00000001"=0.125pF, "00000010"=0.25pF, "00000100"=0.5pF); Default = "00000000";
0x07
0
0
0
0
0
0
0
0
00
XTALCAP[7:0]
0x08
0
0
0
0
0
0
0
0
00
ODIV0_CONFIG0
IP0[2:0]_CONFIG0
RZ0[3:0]_CONFIG0
0x09
0
0
0
0
0
0
0
0
00
ODIV0_CONFIG1
IP0[2:0]_CONFIG1
RZ0[3:0]_CONFIG1
0x0A
0
0
0
0
0
0
0
0
00
ODIV0_CONFIG2
IP0[2:0]_CONFIG2
RZ0[3:0]_CONFIG2
PLL0 LOOP FILTER SETTING Loop Filter Values for PLL0 - For 4 Configurations (Default value is '0'); CONFIG0 will be selected if GINx are disabled and operating in MFC mode ODIV0_CONFIGx=Determines which one of the 2 "Qx-Divider" Configurations to use with, for any of the "Qx-Divider" block associated with PLL0; Used in MFC mode; Default ODIV value is "0", and use CONFIG0 of Qx-Divider; Resistor = 0.3K + RZ0[3:0] * 1K, 0.3 to 15.3kOhm with 1kOhm Step, ("0000"=0.3kOhm, "0001"=1.3kOhm, "0010"=2.3kOhm, ...); Zero capacitor = 6pF + CZ0[3:0] * 27.2pF, 6pF to 414pF with 27.2pF Step, ("0000"=6pF, "0001"=33.2pF, "0010"=60.4pF", ...); Pole capacitor = 1.3pF + CP0[3:0] * 0.75pF, 1.3pF to 12.55pF with 0.75pF Step, ("0000"=1.3pF, "0001"=2.05pF, "0010"=2.8pF, ...) Charge pump current = 5 * 2^IP0[2:0] A, 5uA to 640uA with 5, 10, 20, 40, ... binary step;
0x0B
0
0
0
0
0
0
0
0
00
ODIV0_CONFIG3
IP0[2:0]_CONFIG3
RZ0[3:0]_CONFIG3
0x0C
0
0
0
0
0
0
0
0
00
CP0[3:0]_CONFIG0
CZ0[3:0]_CONFIG0
0x0D
0
0
0
0
0
0
0
0
00
CP0[3:0]_CONFIG1
CZ0[3:0]_CONFIG1
0x0E
0
0
0
0
0
0
0
0
00
CP0[3:0]_CONFIG2
CZ0[3:0]_CONFIG2
0x0F
0
0
0
0
0
0
0
0
00
CP0[3:0]_CONFIG3
CZ0[3:0]_CONFIG3
0x10
0
0
0
0
0
0
0
0
00
D0[7:0]_CONFIG0
0x11
0
0
0
0
0
0
0
0
00
D0[7:0]_CONFIG1
PLL0 INPUT DIVIDER D0 SETTING PLL0 D-Divider Values (Prescaler) - For 4 Configurations (Default value is '0');
0x12
0
0
0
0
0
0
0
0
00
D0[7:0]_CONFIG2
0x13
0
0
0
0
0
0
0
0
00
D0[7:0]_CONFIG3
0x14
0
0
0
0
0
0
0
0
00
N0[7:0]_CONFIG0
0x15
0
0
0
0
0
0
0
0
00
N0[7:0]_CONFIG1
PLL0 MULTIPLIER SETTING
0x16
0
0
0
0
0
0
0
0
00
N0[7:0]_CONFIG2
CONFIG0 will be selected if GINx are disabled and operating in MFC mode. N0[11:0]_CONFIGx - Part of PLL0 M Integer Feedback Divider Values (see equation below) - For 4 Configurations (Default value is '0'); A0[3:0]_CONFIGx - Part of PLL0 M Integer Feedback Divider Values (see equation below) - For 4 Configurations (Default value is '0'); SSC_OFFSET0[5:0] - Spread Spectrum Fractional Multiplier Offset Value. See Spread Spectrum Settings in register address range 0x60-0x67
0x17
0
0
0
0
0
0
0
0
00
N0[7:0]_CONFIG3
0x18
0
0
0
0
0
0
0
0
00
A0[3:0]_CONFIG0
N0[11:8]_CONFIG0
Total Multiplier Value M0 = 2 * N0[11:0] + A0 + 1 + SS_OFFSET0 * 1/64 When A0[3:0] = 0 and spread spectrum disabled, M0= 2 * N0[11:0]; When A0[3:0] > 0 and spread spectrum disabled, M0 = 2 * N0[11:0] + A0 + 1; (Note: A < N-1, i.e. valid M values are 2, 4, 6, 8, 9, 10, 11, 12, 13, ..., 4095 assuming within fPFD and fVCO spec);
0x19
0
0
0
0
0
0
0
0
00
A0[3:0]_CONFIG1
N0[11:8]_CONFIG1
0x1A
0
0
0
0
0
0
0
0
00
A0[3:0]_CONFIG2
N0[11:8]_CONFIG2
0x1B
0
0
0
0
0
0
0
0
00
A0[3:0]_CONFIG3
N0[11:8]_CONFIG3
0x1C
0
0
0
0
0
0
0
0
00
SP
SH
OE6
OE5
OE4
OE3
OE2
OE1
SP=Shutdown/OE Polarity for SHUTDOWN/OE signal pin, ("0"= Active High (Default), "1"= Active Low); OEx=Output Disable Function for OUTx, ("1"=OUTx disabled based on OE pin (Default for OUT2-6, Disable mode is defined by OEMx bits), "0"= Outputs enabled and no association with OE pin (Default)); OSx=Output Power Suspend function for OUTx, ("1"=OUTx will be suspended on GIN3/SUSPEND pin (MFC="1"), "0"= Always Enabled (Default)); PLLSx=Determines which PLLx to suspend when GIN3 is programmed to be used as SUSPEND, It suspends all the outputs associated with that PLL, ("1"= suspends based on SUSPEND pin, "0"= PLL enabled and no association with SUSPEND pin (Default)); It over-rides OSx bits; SH=Determines the function of the SHUTDOWN/OE signal pin. ("1"=Global Shutdown; this over-rides OEx and OSx bits, "0"=Ouput Enable/Disable (Default)) OKC=clock OK count, "0"=8 cycles, "1"=1024 cycles (Default) of Input Clocks for Revertive Switchover Mode: Address 0x1D, Bit 7; Address 0x1E, Bits [7:3] are reserved and should be set to "0"
0x1D
0
1
0
0
0
0
0
0
40
OKC
OS6
OS5
OS4
OS3
OS2
OS1
0x1E
0
0
0
0
0
0
0
0
00
PLLS2
PLLS1
PLLS0
32
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
RAM (PROGRAMMING REGISTER) TABLES
BIT # (Default Settings) BIT # ADDR 7 6 5 4 3 2 1 0
Default Register Hex Value
7
6
5
4
3
2
1
0
DESCRIPTION
0x1F
0
0
0
0
0
0
0
0
00
OEM1[1;0]
SLEW1[1:0]
INV1
Configuring Output OUT1 INV1=Output Inversion for OUT1 ("0"= Non-Invert (Default), "1"=Invert); SLEW1=Slew Rate Settings for OUT1 output ("00"= 2.75V/ns (Default), "01"=2V/ns, "10"=1.25V/ns, "11"=0.7V/ns); OEM1= Output Enable Mode for OUT1 output, when used with OE1 bit and SHUTDOWN/OE pin ("0x" = Tri-state (Default), "10"=Park Low, "11"=Park High); Address 0x1F, Bits 3, 1, 0 are reserved and should be set to "0"
0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27 0x28 0x29 0x2A 0x2B 0x2C 0x2D 0x2E 0x2F 0x30 0x31 0x32 0x33
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ODIV1_CONFIG0 ODIV1_CONFIG1 ODIV1_CONFIG2 ODIV1_CONFIG3
IP1[2:0]_CONFIG0 IP1[2:0]_CONFIG1 IP1[2:0]_CONFIG2 IP1[2:0]_CONFIG3 CP1[3:0]_CONFIG0 CP1[3:0]_CONFIG1 CP1[3:0]_CONFIG2 CP1[3:0]_CONFIG3 D1[7:0]_CONFIG0 D1[7:0]_CONFIG1 D1[7:0]_CONFIG2 D1[7:0]_CONFIG3 N1[7:0]_CONFIG0 N1[7:0]_CONFIG1 N1[7:0]_CONFIG2 N1[7:0]_CONFIG3 A1[3:0]_CONFIG0 A1[3:0]_CONFIG1 A1[3:0]_CONFIG2 A1[3:0]_CONFIG3
RZ1[3:0]_CONFIG0 RZ1[3:0]_CONFIG1 PLL1 LOOP FILTER SETTING RZ1[3:0]_CONFIG2 RZ1[3:0]_CONFIG3 CZ1[3:0]_CONFIG0 CZ1[3:0]_CONFIG1 CZ1[3:0]_CONFIG2 CZ1[3:0]_CONFIG3 Loop Filter Values for PLL1 - For 4 Configurations (Default value is '0'); CONFIG0 will be selected if GINx are disabled and operating in MFC mode. ODIV1_CONFIGx=Determines which one of the 2 "Qx-Divider" Configurations to use with, for any of the "Qx-Divider" block associated with PLL1; Used in MFC mode; Default ODIV value is "0", and use CONFIG0 of Qx-Divider; Resistor = 0.3K + RZ1[3:0] * 1K, 0.3 to 15.3kOhm with 1kOhm Step, ("0000"=0.3kOhm, "0001"=1.3kOhm, "0010"=2.3kOhm, ...); Zero capacitor = 6pF + CZ1[3:0] * 27.2pF, 6pF to 414pF with 27.2pF Step, ("0000"=6pF, "0001"=33.2pF, "0010"=60.4pF", ...); Pole capacitor = 1.3pF + CP1[3:0] * 0.75pF, 1.3pF to 12.55pF with 0.75pF Step, ("0000"=1.3pF, "0001"=2.05pF, "0010"=2.8pF, ...) Charge pump current = 5 * 2^IP1[2:0] A, 5uA to 640uA with 5, 10, 20, 40, ... binary step;
PLL1 INPUT DIVIDER D1 SETTING PLL1 D-Divider Values (Prescaler) - For 4 Configurations (Default value is '0');
PLL1 MULTIPLIER SETTING CONFIG0 will be selected if GINx are disabled and operating in MFC mode. N1[11:0]_CONFIGx - Part of PLL1 M Integer Feedback Divider Values (see equation below) - For 4 Configurations (Default value is '0'); A1[3:0]_CONFIGx - Part of PLL1 M Integer Feedback Divider Values (see equation below) - For 4 Configurations (Default value is '0'); SSC_OFFSET1[5:0] - Spread Spectrum Fractional Multiplier Offset Value. See Spread Spectrum Settings in register address range 0x68-0x6F Total Multiplier Value M1 = 2 * N1[11:0] + A1 + 1 + SS_OFFSET1 * 1/64 When A1[3:0] = 0 and spread spectrum disabled, M1= 2 * N1[11:0]; When A1[3:0] > 0 and spread spectrum disabled, M1 = 2 * N1[11:0] + A1 + 1 ; (Note: A < N-1, i.e. valid M values are 2, 4, 6, 8, 9, 10, 11, 12, 13, ..., 4095 assuming within fPFD and fVCO spec);
N1[11:8]_CONFIG0 N1[11:8]_CONFIG1 N1[11:8]_CONFIG2 N1[11:8]_CONFIG3
0x34
0
1
0
0
0
1
1
0
46
SRC2[1:0]
SRC1[1:0]
SM[1:0]
PRIMCLK
PRIMCLK=Priority Selection for Input Clock ("0"=XTALIN/REF_IN becomes Primary (Default), "1"=CLK_IN becomes Primary); SM = Switchover Mode ("0x"=Manual, "10"= Auto-NonRevertive, "11"=Auto-Revertive (Default)); Bit 3 is reserved and should be set to "0". SRCx[1:0]=Input Source Selection for Output Dividers "Qx" blocks ("00"=Selected Input CLK, "01"=PLL0, "10"=PLL1, "11"=PLL2); Default on SRC1 is the selected input clock. Default on SRC2-6 is PLL0 which will be powered down.
0x35
0
1
0
1
0
1
0
1
55
SRC6[1:0]
SRC5[1:0]
SRC4[1:0]
SRC3[1:0]
0x36 Read-Only No Register Exists 0x37 0x38 0x39 0x3A 0x3B 0x3C 0x3D 0x3E 0x3F 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 00 00 00 00 00 00 00 ODIV2_CONFIG0 ODIV2_CONFIG1 ODIV2_CONFIG2 ODIV2_CONFIG3 IP2[2:0]_CONFIG0 IP2[2:0]_CONFIG1 IP2[2:0]_CONFIG2 IP2[2:0]_CONFIG3 CP2[3:0]_CONFIG0 CP2[3:0]_CONFIG1 CP2[3:0]_CONFIG2 CP2[3:0]_CONFIG3 RZ2[3:0]_CONFIG0 RZ2[3:0]_CONFIG1 PLL2 LOOP FILTER SETTING RZ2[3:0]_CONFIG2 RZ2[3:0]_CONFIG3 CZ2[3:0]_CONFIG0 CZ2[3:0]_CONFIG1 CZ2[3:0]_CONFIG2 CZ2[3:0]_CONFIG3 Loop Filter Values for PLL2 - For 4 Configurations (Default value is '0'); CONFIG0 will be selected if GINx are disabled and operating in MFC mode. ODIV2_CONFIGx=Determines which one of the 2 "Qx-Divider" Configurations to use with, for any of the "Qx-Divider" block associated with PLL2; Used in MFC mode; Default ODIV value is "0", and use CONFIG0 of Qx-Divider; Resistor = 0.3K + RZ2[3:0] * 1K, 0.3 to 15.3kOhm with 1kOhm Step, ("0000"=0.3kOhm, "0001"=1.3kOhm, "0010"=2.3kOhm, ...); Zero capacitor = 6pF + CZ2[3:0] * 27.2pF, 6pF to 414pF with 27.2pF Step, ("0000"=6pF, "0001"=33.2pF, "0010"=60.4pF", ...); Pole capacitor = 1.3pF + CP2[3:0] * 0.75pF, 1.3pF to 12.55pF with 0.75pF Step, ("0000"=1.3pF, "0001"=2.05pF, "0010"=2.8pF, ...) Charge pump current = 5 * 2^IP2[2:0] A, 5uA to 640uA with 5, 10, 20, 40, ... binary step;
33
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
RAM (PROGRAMMING REGISTER) TABLES
BIT # (Default Settings) BIT #
ADDR
7
6
5
4
3
2
1
0
Default Register Hex Value
00
7
6
5
4
3
2
1
0
DESCRIPTION
0x40
0
0
0
0
0
0
0
0
D2[7:0]_CONFIG0
0x41
0
0
0
0
0
0
0
0
00
D2[7:0]_CONFIG1 PLL2 INPUT DIVIDER D2 SETTING PLL2 D-Divider Values (Prescaler) - For 4 Configurations (Default value is '0');
0x42
0
0
0
0
0
0
0
0
00
D2[7:0]_CONFIG2
0x43
0
0
0
0
0
0
0
0
00
D2[7:0]_CONFIG3
0x44
0
0
0
0
0
0
0
0
00
N2[7:0]_CONFIG0
0x45
0
0
0
0
0
0
0
0
00
N2[7:0]_CONFIG1
0x46
0
0
0
0
0
0
0
0
00
N2[7:0]_CONFIG2 PLL2 MULTIPLIER SETTING
0x47
0
0
0
0
0
0
0
0
00
N2[7:0]_CONFIG3
CONFIG0 will be selected if GINx are disabled and operating in MFC mode. N2[11:0]_CONFIGx - Part of PLL2 M Integer Feedback Divider Values (see equation below) - For 4 Configurations (Default value is '0');
0x48
0
0
0
0
0
0
0
0
00
N2[11:8]_CONFIG0
Total Multiplier Value M2 = N2; Bits [7:4] in addresses 0x48, 0x49, 0x4A, and 0x4B are reserved and should be set to "0"
0x49
0
0
0
0
0
0
0
0
00
N2[11:8]_CONFIG1
0x4A
0
0
0
0
0
0
0
0
00
N2[11:8]_CONFIG2
0x4B
0
0
0
0
0
0
0
0
00
N2[11:8]_CONFIG3
0x4C
0
0
0
0
0
0
0
0
00
OEM2[1:0]
SLEW2[1:0]
INV2 Configuring Output OUT2 INV2=Output Inversion for OUT2 ("0"= Non-Invert (Default), "1"=Invert); SLEW2=Slew Rate Settings for OUT2 output ("00"= 2.75V/ns (Default), "01"=2V/ns, "10"=1.25V/ns, "11"=0.7V/ns); OEM2= Output Enable Mode for OUT2output, when used with OE2 bit and SHUTDOWN/OE pin ("0x" = Tri-state (Default), "10"=Park Low, "11"=Park High); Q2[x:x]=Output Divider "Q2" Values (Default value is '2') - Support 2 output configurations when used in MFC mode; PM2[x:x]=Divide Mode, ("00"=Divider Disabled;"01"=Divide by '1';"10"=Divide by 2; "11"=Divide by (Q+2) (Default)); (Note: To enable OUT2, PM2 register bit values for both CONFIG0 and CONFIG1 configurations must be non-zero.) Address 0x4C, Bits 3, 1, 0 are reserved and should be set to "0"
0x4D
1
0
1
1
1
0
1
1
BB
Q2[1:0]_CONFIG1
PM2[1:0]_CONFIG1
Q2[1:0]_CONFIG0
PM2[1:0]_CONFIG0
0x4E
0
0
0
0
0
0
0
0
00
Q2[9:2]_CONFIG0
0x4F
0
0
0
0
0
0
0
0
00
Q2[9:2]_CONFIG1
0x50
0
0
0
0
0
0
0
0
00
OEM3[1:0]
SLEW3[1:0]
INV3 Configuring Output OUT3 INV3=Output Inversion for OUT3 ("0"= Non-Invert (Default), "1"=Invert); SLEW3=Slew Rate Settings for OUT3 output ("00"= 2.75V/ns (Default), "01"=2V/ns, "10"=1.25V/ns, "11"=0.7V/ns); OEM3= Output Enable Mode for OUT3 output, when used with OE3 bit and SHUTDOWN/OE pin ("0x" = Tri-state (Default), "10"=Park Low, "11"=Park High); Q3[x:x]=Output Divider "Q3" Values (Default value is '2') - Support 2 output configurations when used in MFC mode; PM3[x:x]=Divide Mode, ("00"=Divider Disabled;"01"=Divide by '1';"10"=Divide by 2; "11"=Divide by (Q+2) (Default)); (Note: To enable OUT3, PM3 register bit values for both CONFIG0 and CONFIG1 configurations must be non-zero.) Address 0x50, Bits 3, 1, 0 are reserved and should be set to "0"
0x51
1
0
1
1
1
0
1
1
BB
Q3[1:0]_CONFIG1
PM3[1:0]_CONFIG1
Q3[1:0]_CONFIG0
PM3[1:0]_CONFIG0
0x52
0
0
0
0
0
0
0
0
00
Q3[9:2]_CONFIG0
0x53
0
0
0
0
0
0
0
0
00
Q3[9:2]_CONFIG1
0x54
0
0
0
0
1
1
0
0
0C
OEM4[1:0]
SLEW4[1:0]
INV4_1
INV4_0
LVL4[1:0]
0x55
1
0
1
1
1
0
1
1
BB
Q4[1:0]_CONFIG1
PM4[1:0]_CONFIG1
Q4[1:0]_CONFIG0
PM4[1:0]_CONFIG0
0x56
0
0
0
0
0
0
0
0
00
Q4[9:2]_CONFIG0
Configuring Output OUT4 INV4_1=Output Inversion for /OUT4 ("0"= Invert , "1"=Non-Invert (Default)); INV4_0=Output Inversion for OUT4 ("0"= Invert , "1"=Non-Invert (Default)); SLEW4=Slew Rate Settings for OUT4 output ("00"= 2.75V/ns (Default), "01"=2V/ns, "10"=1.25V/ns, "11"=0.7V/ns); OEM4= Output Enable Mode for OUT4 output, when used with OE4 bit and SHUTDOWN/OE pin ("0x" = Tri-state (Default), "10"=Park Low, "11"=Park High); LVL4=Output IO Standard Selection, ("00"=LVTTL (Default), "01"=LVDS, "10"=LVPECL, "11"=Reserved); Q4[x:x]=Output Divider "Q4" Values (Default value is '2') - Support 2 output configurations when used in MFC mode; PM4[x:x]=Divide Mode, ("00"=Divider Disabled;"01"=Divide by '1';"10"=Divide by 2; "11"=Divide by (Q+2) (Default)); (Note: To enable OUT4, PM4 register bit values for both CONFIG0 and CONFIG1 configurations must be non-zero.) When using LVPECL or LVDS outputs, SLEW4 must be set to "00".
0x57
0
0
0
0
0
0
0
0
00
Q4[9:2]_CONFIG1
0x58
0
0
0
0
1
1
0
0
0C
OEM5[1:0]
SLEW5[1:0]
INV5_1
INV5_0
LVL5[1:0]
0x59
1
0
1
1
1
0
1
1
BB
Q5[1:0]_CONFIG1
PM5[1:0]_CONFIG1
Q5[1:0]_CONFIG0
PM5[1:0]_CONFIG0
0x5A
0
0
0
0
0
0
0
0
00
Q5[9:2]_CONFIG0
Configuring Output OUT5 INV5_1=Output Inversion for /OUT5 ("0"= Invert, "1"=Non-Invert (Default)); INV5_0=Output Inversion for OUT5 ("0"= Invert, "1"=Non-Invert (Default)); SLEW5=Slew Rate Settings for OUT5 output ("00"= 2.75V/ns (Default), "01"=2V/ns, "10"=1.25V/ns, "11"=0.7V/ns); OEM5= Output Enable Mode for OUT5 output, when used with OE5 bit and SHUTDOWN/OE pin ("0x" = Tri-state (Default), "10"=Park Low, "11"=Park High); LVL5=Output IO Standard Selection, ("00"=LVTTL (Default), "01"=LVDS, "10"=LVPECL, "11"=Reserved); Q5[x:x]=Output Divider "Q5" Values (Default value is '2') - Support 2 output configurations when used in MFC mode; PM5[x:x]=Divide Mode, ("00"=Divider Disabled;"01"=Divide by '1';"10"=Divide by 2; "11"=Divide by (Q+2) (Default)); (Note: To enable OUT5, PM5 register bit values for both CONFIG0 and CONFIG1 configurations must be non-zero.) When using LVPECL or LVDS outputs, SLEW5 must be set to "00".
0x5B
0
0
0
0
0
0
0
0
00
Q5[9:2]_CONFIG1
0x5C
0
0
0
0
0
0
1
1
03
OEM6[1:0]
SLEW6[1:0]
INV6
0x5D
1
0
1
1
1
0
1
1
BB
Q6[1:0]_CONFIG1
PM6[1:0]_CONFIG1
Q6[1:0]_CONFIG0
PM6[1:0]_CONFIG0
0x5E
0
0
0
0
0
0
0
0
00
Q6[9:2]_CONFIG0
Configuring Output OUT6 INV6=Output Inversion for OUT6 ("0"= Non-Invert (Default), "1"=Invert); SLEW6=Slew Rate Settings for OUT6 output ("00"= 2.75V/ns (Default), "01"=2V/ns, "10"=1.25V/ns, "11"=0.7V/ns); OEM6= Output Enable Mode for OUT6 output, when used with OE6 bit and SHUTDOWN/OE pin ("0x" = Tri-state (Default), "10"=Park Low, "11"=Park High); Q6[x:x]=Output Divider "Q6" Values (Default value is '2') - Support 2 output configurations when used in MFC mode; PM6[x:x]=Divide Mode, ("00"=Divider Disabled;"01"=Divide by '1';"10"=Divide by 2; "11"=Divide by (Q+2) (Default)); (Note: To enable OUT6, PM6 register bit values for both CONFIG0 and CONFIG1 configurations must be non-zero.) Address 0x5C, Bits 3 is reserved and should be set to "0" Address 0x5C, Bits 1, 0 are reserved and should be set to "1"
0x5F
0
0
0
0
0
0
0
0
00
Q6[9:2]_CONFIG1
34
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
RAM (PROGRAMMING REGISTER) TABLES
BIT # (Default Settings) BIT # ADDR 7 6 5 4 3 2 1 0
Default Register Hex Value
00
7
6
5
4
3
2
1
0
DESCRIPTION
0x60
0
0
0
0
0
0
0
0
TSSC0[3:0]
NSSC0[3:0]
0x61
0
0
0
0
0
0
0
0
00
DITH0
X2_0
SS_OFFSET0[5:0]
0x62
0
0
0
0
0
0
0
0
00
SD0[3:0][1]
SD0[3:0][0]
SPREAD SPRECTRUM SETTINGS FOR PLL0
0x63 0 0 0 0 0 0 0 0 00 SD0[3:0][3] SD0[3:0][2]
0x64
0
0
0
0
0
0
0
0
00
SD0[3:0][5]
SD0[3:0][4]
SS_OFFSET0=SS Fractional Offset/ First Sample (Unsigned); TSSC0=# of PFD Cycles Per SS Cycle Step, TSSC="0000" for SSC off (Default); NSSC0=# of SS Samples to Use from SS Memory (Default is "0"); DITH0=LSB DITHER on , ("1"=dither on, "0"=off (Default)); X2_0= output x2, ("1"=x2, "0"=normal (Default)); SD0=Delta-encoded samples (unsigned); Waveform start with SS_OFFSET0, then SS_OFFSET0+SD0[0], etc. (Default is "0");
0x65
0
0
0
0
0
0
0
0
00
SD0[3:0][7]
SD0[3:0][6]
0x66
0
0
0
0
0
0
0
0
00
SD0[3:0][9]
SD0[3:0][8]
0x67
0
0
0
0
0
0
0
0
00
SD0[3:0][11]
SD0[3:0][10]
0x68
0
0
0
0
0
0
0
0
00
TSSC1[3:0]
NSSC1[3:0]
0x69
0
0
0
0
0
0
0
0
00
DITH1
X2_1
SS_OFFSET1[5:0]
0x6A
0
0
0
0
0
0
0
0
00
SD1[3:0][1]
SD1[3:0][0]
SPREAD SPRECTRUM SETTINGS FOR PLL1
0x6B 0 0 0 0 0 0 0 0 00 SD1[3:0][3] SD1[3:0][2]
0x6C
0
0
0
0
0
0
0
0
00
SD1[3:0][5]
SD1[3:0][4]
SS_OFFSET1=SS Fractional Offset/ First Sample (Unsigned); TSSC1=# of PFD Cycles Per SS Cycle Step, TSSC="0000" for SSC off (Default); NSSC1=# of SS Samples to Use from SS Memory (Default is "0"); DITH1=LSB DITHER on , ("1"=dither on, "0"=off (Default)); X2_1= output x2, ("1"=x2, "0"=off (Default)); SD1=Delta-encoded samples (unsigned); Waveform start with SS_OFFSET1, then SS_OFFSET1+SD1[0], etc. (Default is "0");
0x6D
0
0
0
0
0
0
0
0
00
SD1[3:0][7]
SD1[3:0][6]
0x6E
0
0
0
0
0
0
0
0
00
SD1[3:0][9]
SD1[3:0][8]
0x6F
0
0
0
0
0
0
0
0
00
SD1[3:0][11]
SD1[3:0][10]
0x70 0x71 0x72 0x73 0x74 0x75 0x76 0x77 0x78 0x79 0x7A 0x7B 0x7C 0x7D 0x7E 0x7F 0x80 0x81 CERR CRC error in EEPROM CERR = CRC error bit indicator ("1" = CRC error) Read-Only
No Register Exists
Read-Only
35
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
RECOMMENDED LANDING PATTERN
NL 28 pin
NOTE:
All dimensions are in millimeters.
36
IDT5V9885 3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDT XXXXX Device Type XX Package X Process
I PFG NLG 5V9885
Industrial (-40C to +85C) Thin Quad Flat Pack - Green Thermally Enhanced Plastic Very Fine Pitch Quad Flat No Lead Package - Green 3.3V EEPROM Programmable Clock Generator
CORPORATE HEADQUARTERS 6024 Silver Creek Valley Road San Jose, CA 95138
for SALES: 800-345-7015 or 408-284-8200 fax: 408-284-2775 www.idt.com
for Tech Support: clockhelp@idt.com
37

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