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| ICS556-01 BROADCOM 25 MHZ LVDS CLOCK Description The ICS556-01 is a clock oscillator with LVDS outputs. Using a standard 25 MHz crystal, the device outputs a .25 mHz (reference) differential output clock. The operation voltage is 2.5 V to support today's popular interfaces. The termination resistor is off-chip. Features * * * * * * Packaged in 8-pin TSSOP Requires no external components Low Phase Jitter: <1 ps from 10 kHz to 10 MHz Differential LVDS outputs Operating voltage of 2.5 V. Advanced, low power, sub-micron CMOS process Block Diagram VDD OE X1 25 MHz Crystal X2 Crystal Oscillator CLK 100 CLK 2 GND MDS 556-01 B I n t e gra te d C i r c u i t S y s t e m s 1 525 Race Stre et, San Jo se, CA 9 5126 Revision 020204 te l (40 8) 2 97-12 01 w w w. i c st . c o m ICS556-01 Broadcom 25 MHz LVDS Clock Pin Assignment X1 VDD GND GND 1 2 3 4 8 7 6 5 X2 OE CLK CLK ICS556-01 8 Pin (173m il) TSSO P or SO IC Pin Descriptions Pin Number 1 2 3 4 5 6 7 8 Pin Name X1 VDD GND GND CLK CLK OE X2 Pin Type Input Power Power Power Output Power Input Input Crystal connection. Pin Description Power supply. Connect to 2.5 V. Connect to ground. Connect to ground. Inverting differential clock output. Differential clock output. Output Enable. Internal pull-up resistor. Crystal connection. only partial outputs are used, it is recommended to terminate the un-used outputs. External Component Selection The ICS556-01 requires a minimum number of external components for proper operation. A 100 termination resistor between CLK and CLK is provided on-chip. 2.5V LVDS_Driver 2.5V + - Decoupling Capacitors A decoupling capacitor of 0.01F should be connected between VDD and GND on pins 2 and 3 as close to the ICS556-01 as possible. For optimum device performance, the decoupling capacitor should be mounted on the component side of the PCB. Avoid the use of vias in the decoupling circuit. R1 100 ohm 100 Ohm Differential Transmission Line LVDS Driver Termination A general LVDS interface is shown in Figure 2. In a 100 differential transmission line environment, LVDS drivers require a matched load termination of 100 across near the receiver input. For a multiple LVDS outputs buffer, if FIGURE 2. TYPICAL LVDS DRIVER TERMINATION MDS 556-01 B In te grated Circuit Systems 2 525 Ra ce Street, San Jose, CA 9512 6 Revision 020204 tel (4 08) 297-1 201 w w w. i c s t . c o m ICS556-01 Broadcom 25 MHz LVDS Clock Quartz Crystal The ICS556-01 25 MHz LVDS Clock utilizes an external crystal to generate a low phase noise output. To assure the best system performance and reliability, a crystal device with the recommended parameters (shown below) must be used, and the layout guidelines discussed in the following section shown must be followed. The frequency of oscillation of a quartz crystal is determined by its "cut" and by the load capacitors connected to it. The crystal specified for use with the ICS556-01 is designed to have zero frequency error when the total of on-chip plus stray capacitance is 5 pF. Recommended Crystal Parameters: Initial Accuracy of 25C20 ppm Temperature Stability20 ppm Load Capacitance5 pf Shunt Capacitance, C02 pF Max Equivalent Series Resistance80 Max The external crystal must be connected as close to the chip as possible and should be on the same side of the PCB as the ICS556-01. There should be no via's between the crystal pins and the X1 and X2 device pins. There should be no signal traces underneath or close to the crystal. The value (in pF) of these crystal caps should equal (CL - 12 pF)*2. In this equation, CL =crystal load capacitance in pF. Example: or a crystal with a 16 pF load capacitance, each crystal capacitor would be 8 pF [(16-12) x 2] = 8. Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the ICS556-01. These ratings, which are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical parameters are guaranteed only over the recommended operating temperature range. Item Supply Voltage, VDD All Inputs and Outputs Ambient Operating Temperature Storage Temperature Soldering Temperature 7V Rating -0.5 V to VDD+0.5 V 0 to +70C -65 to +150C 260C Recommended Operation Conditions Parameter Ambient Operating Temperature Power Supply Voltage (measured in respect to GND) Reference crystal parameters Min. 0 +2.375 Typ. Max. +70 +2.625 Units C V Refer to page 3 MDS 556-01 B In te grated Circuit Systems 3 525 Ra ce Street, San Jose, CA 9512 6 Revision 020204 tel (4 08) 297-1 201 w w w. i c s t . c o m ICS556-01 Broadcom 25 MHz LVDS Clock DC Electrical Characteristics VDD=2.5 V 5% , Ambient temperature 0 to +70C, unless stated otherwise Parameter Operating Voltage Output High Voltage Output Low Voltage Output High Voltage (CMOS Level) Operating Supply Current Symbol VDD VOH VOL VOH IDD Conditions Note 1 Note 1 IOH = -4 mA No load, OE = 1 No load, OE = 0 Min. 2.375 1.375 Typ. Max. 2.625 1.125 Units V V V V VDD-0.4 5.3 1.7 mA mA Note 1: Outputs terminated with 50 to VDD/2 AC Electrical Characteristics VDD = 2.5 V 5%, Ambient Temperature 0 to +70 C, unless stated otherwise Parameter Input Frequency Output Frequency Differential Output Voltages (VOD) VOD Offset Voltage (VOS) VOS Differential Output Short Circuit Current (IOSD) Output Short Circuit Current (IOS) Output Rise Time Output Fall Time Output Clock Duty Cycle Maximum Output Jitter (p-p) Phase Jitter (RMS) Conditions Min. Typ. 25 25 Max. Units MHz MHz 450 40 1.375 25 mV mV V mV mA mA 1.2 1.2 55 ns ns % ps 2.5 ps 250 VOD Magnitude Change VOS Magnitude Change -40 1.125 350 0 1.25 3 -3.5 -3.5 20% to 80%, no load 20% to 80%, no load Measured at 1.25 V, CL=5 pF CL=5 pF Phase Noise integrated from 10 kHz to 10 MHz 45 0.8 0.8 50 40 1.8 MDS 556-01 B In te grated Circuit Systems 4 525 Ra ce Street, San Jose, CA 9512 6 Revision 020204 tel (4 08) 297-1 201 w w w. i c s t . c o m ICS556-01 Broadcom 25 MHz LVDS Clock Parameter Measurement Information V DD = 2.5V5% Z = 50 SCOPE Qx 50 LVDS Z = 50 nQx 80% 80% VOD 50 Clock Outputs 20% tOR tOF 20% 2.5V OUTPUT LOAD AC TEST CIRCUIT OUTPUT RISE/FALL TIME V DD nCLK LV D S out D C In p u t 50 50 out CLK Pulse Width V O S / V O S tPERIOD VOS SETUP tPW & tPERIOD V DD nCLK VOH out CLK t() VOL DC Input LVDS 100 V OD / V OD out tjit() = t() - t()mean = Phase Jitter PHASE JITTER V OD SETUP VDD nCLK CLK VOD Cross Points VOS GND DIFFERENTIAL INPUT LEVEL MDS 556-01 B In te grated Circuit Systems 5 525 Ra ce Street, San Jose, CA 9512 6 Revision 020204 tel (4 08) 297-1 201 w w w. i c s t . c o m ICS556-01 Broadcom 25 MHz LVDS Clock Package Outline and Package Dimensions (8-pin TSSOP) Package dimensions are kept current with JEDEC Publication No. 95 8 Millimeters Symbol Min Max Inches Min Max E1 IN D EX AR EA E 1 2 D A A1 A2 b C D E E1 e L aaa -1.20 0.05 0.15 0.80 1.05 0.19 0.30 0.09 0.20 2.90 3.10 6.40 BASIC 4.30 4.50 0.65 Basic 0.45 0.75 0 8 0.10 -0.047 0.002 0.006 0.032 0.041 0.007 0.012 0.0035 0.008 0.114 0.122 0.252 BASIC 0.169 0.177 0.0256 Basic 0.018 0.030 0 8 0.004 A 2 A 1 A c -Ce b S E A T IN G P LA N E L aaa C Ordering Information Part / Order Number ICS556G-01 ICS556G-01T Marking 556G-01 556G-01 Shipping packaging Tubes Tape and Reel Package 8-pin TSSOP 8-pin TSSOP Temperature 0 to +70 C 0 to +70 C While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS) assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS product for use in life support devices or critical medical instruments. MDS 556-01 B In te grated Circuit Systems 6 525 Ra ce Street, San Jose, CA 9512 6 Revision 020204 tel (4 08) 297-1 201 w w w. i c s t . c o m |
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