View CY7C4215V-15ASC_4152695.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

CY7C4425V /4205V/4215V CY7C4225V /4235V/4245V64/256/512/1K/2K/4K x18 Low-Voltage Synchronous FIFOs
CY7C4225V/4205V/4215V CY7C4425V/4235V/4245V
64/256/512/1K/2K/4K x18 Low-Voltage Synchronous FIFOs
Features
* 3.3V operation for low power consumption and easy integration into low-voltage systems * High-speed, low-power, first-in first-out (FIFO) memories * 64 x 18 (CY7C4425V) * 256 x 18 (CY7C4205V) * 512 x 18 (CY7C4215V) * 1K x 18 (CY7C4225V) * 2K x 18 (CY7C4235V) * 4K x 18 (CY7C4245V) * 0.65 CMOS * High-speed 67-MHz operation (15-ns read/write cycle times) * Low power -- ICC = 30 mA * 5V tolerant inputs (VIH MAX = 5V) * Fully asynchronous and simultaneous read and write operation * Empty, Full, Half Full, and programmable Almost Empty and Almost Full status flags * TTL-compatible * Retransmit function * Output Enable (OE) pin * Independent read and write enable pins * Supports free-running 50% duty cycle clock inputs * Width-Expansion Capability * Depth-Expansion Capability * 64-pin 14 x 14 TQFP and 64-pin 10 x 10 STQFP * Pb-Free packages available
Functional Description
The CY7C42X5V are high-speed, low-power, first-in first-out (FIFO) memories with clocked read and write interfaces. All are 18 bits wide. The CY7C42X5V can be cascaded to increase FIFO depth. Programmable features include Almost Full/Almost Empty flags. These FIFOs provide solutions for a wide variety of data buffering needs, including high-speed data acquisition, multiprocessor interfaces, and communications buffering. These FIFOs have 18-bit input and output ports that are controlled by separate clock and enable signals. The input port is controlled by a Free-Running Clock (WCLK) and a Write Enable pin (WEN). When WEN is asserted, data is written into the FIFO on the rising edge of the WCLK signal. While WEN is held active, data is continually written into the FIFO on each cycle. The output port is controlled in a similar manner by a Free-Running Read Clock (RCLK) and a Read Enable pin (REN). In addition, the CY7C42X5V have an Output Enable pin (OE). The read and write clocks may be tied together for single-clock operation or the two clocks may be run independently for asynchronous read/write applications. Clock frequencies up to 66 MHz are achievable. Retransmit and Synchronous Almost Full/Almost Empty flag features are available on these devices. Depth expansion is possible using the Cascade Input (WXI, RXI), Cascade Output (WXO, RXO), and First Load (FL) pins. The WXO and RXO pins are connected to the WXI and RXI pins of the next device, and the WXO and RXO pins of the last device should be connected to the WXI and RXI pins of the first device. The FL pin of the first device is tied to VSS and the FL pin of all the remaining devices should be tied to VCC. The CY7C42X5V provides five status pins. These pins are decoded to determine one of five states: Empty, Almost Empty, Half Full, Almost Full, and Full (see Table 2). The Half Full flag shares the WXO pin. This flag is valid in the stand-alone and width-expansion configurations. In the depth expansion, this pin provides the expansion out (WXO) information that is used to signal the next FIFO when it will be activated. The Empty and Full flags are synchronous, i.e., they change state relative to either the Read Clock (RCLK) or the write clock (WCLK). When entering or exiting the Empty states, the flag is updated exclusively by the RCLK. The flag denoting Full states is updated exclusively by WCLK. The synchronous flag architecture guarantees that the flags will remain valid from one clock cycle to the next. As mentioned previously, the Almost Empty/Almost Full flags become synchronous if the VCC/SMODE is tied to VSS. All configurations are fabricated using an advanced 0.65 P-Well CMOS technology. Input ESD protection is greater than 2001V, and latch-up is prevented by the use of guard rings.
Cypress Semiconductor Corporation Document #: 38-06029 Rev. *C
*
198 Champion Court
*
San Jose, CA 95134-1709 * 408-943-2600 Revised September 7, 2005
CY7C4225V/4205V/4215V CY7C4425V/4235V/4245V
Logic Block Diagram
D0-17
INPUT REGISTER
WCLK
WEN
WRITE CONTROL RAM ARRAY 64 x 18 256 x 18 512 x 18 1K x 18 2K x 18 4K x 18
FLAG PROGRAM REGISTER
FLAG LOGIC
FF EF PAE PAF SMODE
WRITE POINTER
READ POINTER
RS
RESET LOGIC
FL/RT WXI WXO/HF RXI RXO EXPANSION LOGIC
THREE-STATE OUTPUT REGISTER OE Q0-17
READ CONTROL
RCLK
REN
Pin Configuration
REN LD OE RS VCC GND EF Q17 Q16 GND Q15 VCC/SMODE
STQFP/TQFP Top View
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
D16 D17 GND RCLK
FL/RT WCLK WEN WXI VCC PAF RXI FF WXO/HF RXO
PAE
Q0 Q1 GND Q2
Document #: 38-06029 Rev. *C
Q3
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
CY7C4425V CY7C4205V CY7C4215V CY7C4225V CY7C4235V CY7C4245V
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
Q14 Q13 GND Q12 Q11 VCC Q10 Q9 GND Q8 Q7 Q6 Q5 GND Q4 VCC
Page 2 of 20
CY7C4225V/4205V/4215V CY7C4425V/4235V/4245V
Selection Guide
CY7C42X5V-15 Maximum Frequency Maximum Access Time Minimum Cycle Time Minimum Data or Enable Set-up Minimum Data or Enable Hold Maximum Flag Delay Operating Current CY7C4425V Density Packages 64 x 18 64-pin 14x14 TQFP 64-pin 10x10 STQFP Commercial CY7C4205V 256 x 18 64-pin 14x14 TQFP 64-pin 10x10 STQFP 66.7 11 15 4 1 11 30 CY7C4215V 512 x 18 64-pin 14x14 TQFP 64-pin 10x10 STQFP CY7C42X5V-25 40 15 25 6 1 15 30 CY7C4225V 1K x 18 64-pin 14x14 TQFP 64-pin 10x10 STQFP CY7C42X5V-35 28.6 20 35 7 2 20 30 CY7C4235V 2K x 18 64-pin 14x14 TQFP 64-pin 10x10 STQFP Unit MHz ns ns ns ns ns mA CY7C4245V 4K x 18 64-pin 14x14 TQFP 64-pin 10x10 STQFP
Pin Definitions
Signal Name D0-17 Q0-17 WEN REN WCLK Description Data Inputs Data Outputs Write Enable Read Enable Write Clock I/O I O I I I Data inputs for an 18-bit bus. Data outputs for an 18-bit bus. Enables the WCLK input. Enables the RCLK input. The rising edge clocks data into the FIFO when WEN is LOW and the FIFO is not Full. When LD is asserted, WCLK writes data into the programmable flag-offset register. The rising edge clocks data out of the FIFO when REN is LOW and the FIFO is not Empty. When LD is asserted, RCLK reads data out of the programmable flag-offset register. Dual-Mode Pin. Single device or width expansion - Half Full status flag. Cascaded - Write Expansion Out signal, connected to WXI of next device. When EF is LOW, the FIFO is empty. EF is synchronized to RCLK. When FF is LOW, the FIFO is full. FF is synchronized to WCLK. When PAE is LOW, the FIFO is almost empty based on the almost empty offset value programmed into the FIFO. PAE is asynchronous when VCC/SMODE is tied to VCC; it is synchronized to RCLK when VCC/SMODE is tied to VSS. When PAF is LOW, the FIFO is almost full based on the almost full offset value programmed into the FIFO. PAF is asynchronous when VCC/SMODE is tied to VCC; it is synchronized to WCLK when VCC/SMODE is tied to VSS. When LD is LOW, D0-17 (O0-17) are written (read) into (from) the programmable-flag-offset register. Dual-Mode Pin. Cascaded - The first device in the daisy chain will have FL tied to VSS; all other devices will have FL tied to VCC. In standard mode of width expansion, FL is tied to VSS on all devices. Not Cascaded - Tied to VSS. Retransmit function is also available in standalone mode by strobing RT. Cascaded - Connected to WXO of previous device. Not Cascaded - Tied to VSS. Cascaded - Connected to RXO of previous device. Not Cascaded - Tied to VSS. Function
RCLK
Read Clock
I
WXO/HF EF FF PAE
Write Expansion Out/Half Full Flag Empty Flag Full Flag Programmable Almost Empty
O O O O
PAF
Programmable Almost Full Load First Load/ Retransmit
O
LD FL/RT
I I
WXI RXI
Write Expansion Input Read Expansion Input
I I
Document #: 38-06029 Rev. *C
Page 3 of 20
CY7C4225V/4205V/4215V CY7C4425V/4235V/4245V
Pin Definitions (continued)
Signal Name RXO RS OE Description Read Expansion Output Reset Output Enable I/O O I I Function Cascaded - Connected to RXI of next device. Resets device to empty condition. A reset is required before an initial read or write operation after power-up. When OE is LOW, the FIFO's data outputs drive the bus to which they are connected. If OE is HIGH, the FIFO's outputs are in High Z (high-impedance) state. Dual-Mode Pin. Asynchronous Almost Empty/Almost Full flags - tied to VCC. Synchronous Almost Empty/Almost Full flags - tied to VSS. (Almost Empty synchronized to RCLK, Almost Full synchronized to WCLK.)
VCC/SMODE
Synchronous Almost Empty/ Almost Full Flags
I
Architecture
The CY7C42X5V consists of an array of 64 to 4K words of 18 bits each (implemented by a dual-port array of SRAM cells), a read pointer, a write pointer, control signals (RCLK, WCLK, REN, WEN, RS), and flags (EF, PAE, HF, PAF, FF). The CY7C42X5V also includes the control signals WXI, RXI, WXO, RXO for depth expansion.
Programming
The CY7C42X5V devices contain two 12-bit offset registers. Data present on D0-11 during a program write will determine the distance from Empty (Full) that the Almost Empty (Almost Full) flags become active. If the user elects not to program the FIFO's flags, the default offset values are used (see Table 2). When the Load LD pin is set LOW and WEN is set LOW, data on the inputs D0-11 is written into the Empty offset register on the first LOW-to-HIGH transition of the write clock (WCLK). When the LD pin and WEN are held LOW then data is written into the Full offset register on the second LOW-to-HIGH transition of the Write Clock (WCLK). The third transition of the Write Clock (WCLK) again writes to the Empty offset register (see Table 1). Writing all offset registers does not have to occur at one time. One or two offset registers can be written and then, by bringing the LD pin HIGH, the FIFO is returned to normal read/write operation. When the LD pin is set LOW, and WEN is LOW, the next offset register in sequence is written. The contents of the offset registers can be read on the output lines when the LD pin is set LOW and REN is set LOW; then, data can be read on the LOW-to-HIGH transition of the Read Clock (RCLK). Table 1. Write Offset Register LD 0 WEN 0 WCLK[1] Selection Writing to offset registers: Empty Offset Full Offset No Operation
Resetting the FIFO
Upon power-up, the FIFO must be reset with a Reset (RS) cycle. This causes the FIFO to enter the Empty condition signified by EF being LOW. All data outputs go LOW after the falling edge of RS only if OE is asserted. In order for the FIFO to reset to its default state, a falling edge must occur on RS and the user must not read or write while RS is LOW.
FIFO Operation
When the WEN signal is active (LOW), data present on the D0-17 pins is written into the FIFO on each rising edge of the WCLK signal. Similarly, when the REN signal is active LOW, data in the FIFO memory will be presented on the Q0-17 outputs. New data will be presented on each rising edge of RCLK while REN is active LOW and OE is LOW. REN must set up tENS before RCLK for it to be a valid read function. WEN must occur tENS before WCLK for it to be a valid write function. An Output Enable (OE) pin is provided to three-state the Q0-17 outputs when OE is deasserted. When OE is enabled (LOW), data in the output register will be available to the Q0-17 outputs after tOE. If devices are cascaded, the OE function will only output data on the FIFO that is read enabled. The FIFO contains overflow circuitry to disallow additional writes when the FIFO is full, and underflow circuitry to disallow additional reads when the FIFO is empty. An empty FIFO maintains the data of the last valid read on its Q0-17 outputs even after additional reads occur.
0
1
1
0
Write Into FIFO
1
1
No Operation
Note: 1. The same selection sequence applies to reading from the registers. REN is enabled and read is performed on the LOW-to-HIGH transition of RCLK.
Document #: 38-06029 Rev. *C
Page 4 of 20
CY7C4225V/4205V/4215V CY7C4425V/4235V/4245V
Flag Operation
The CY7C42X5V devices provide five flag pins to indicate the condition of the FIFO contents. Empty and Full are synchronous. PAE and PAF are synchronous if VCC/SMODE is tied to VSS. Full Flag The Full Flag (FF) will go LOW when device is Full. Write operations are inhibited whenever FF is LOW regardless of the state of WEN. FF is synchronized to WCLK, i.e., it is exclusively updated by each rising edge of WCLK. Empty Flag The Empty Flag (EF) will go LOW when the device is empty. Read operations are inhibited whenever EF is LOW, regardless of the state of REN. EF is synchronized to RCLK, i.e., it is exclusively updated by each rising edge of RCLK. Programmable Almost Empty/Almost Full Flag The CY7C42X5V features programmable Almost Empty and Almost Full Flags. Each flag can be programmed (described in the Programming section) a specific distance from the corresponding boundary flags (Empty or Full). When the FIFO contains the number of words or fewer for which the flags have been programmed, the PAF or PAE will be asserted, signifying Table 2. Flag Truth Table Number of Words in FIFO 7C4425V - 64 x 18 0 1 to n[2] (n + 1) to 32 33 to (64 - (m + 1)) (64 - m)[3] to 63 64 0 1 to n[2] (n + 1) to 128 129 to (256 - (m + 1)) (256 - m)[3] to 255 256 Number of Words in FIFO 7C4225V - 1K x 18 0 1 to n[2] (n + 1) to 512 513 to (1024 - (m + 1)) (1024 - m)[3] to 1023 1024 0 1 to n[2] (n + 1) to 1024 1025 to (2048 - (m + 1)) (2048 - m)[3] to 2047 2048 7C4235V - 2K x 18 0 1 to n[2] (n + 1) to 2048 2049 to (4096 - (m + 1)) (4096 - m)[3] to 4095 4096 7C4245V - 4K x 18 FF H H H H H L PAF H H H H L L HF H H H L L L PAE L L H H H H EF L H H H H H 7C4205V - 256 x 18 0 1 to n[2] (n + 1) to 256 257 to (512 - (m + 1)) (512 - m)[3] to 511 512 7C4215V - 512 x 18 FF H H H H H L PAF H H H H L L HF H H H L L L PAE L L H H H H EF L H H H H H that the FIFO is either Almost Full or Almost Empty. See Table 2 for a description of programmable flags. When the SMODE pin is tied LOW, the PAF flag signal transition is caused by the rising edge of the write clock and the PAE flag transition is caused by the rising edge of the read clock.
Retransmit
The retransmit feature is beneficial when transferring packets of data. It enables the receipt of data to be acknowledged by the receiver and retransmitted if necessary. The Retransmit (RT) input is active in the standalone and width expansion modes. The retransmit feature is intended for use when a number of writes equal to or less than the depth of the FIFO have occurred since the last RS cycle. A HIGH pulse on RT resets the internal read pointer to the first physical location of the FIFO. WCLK and RCLK may be free running but must be disabled during and tRTR after the retransmit pulse. With every valid read cycle after retransmit, previously accessed data is read and the read pointer is incremented until it is equal to the write pointer. Flags are governed by the relative locations of the read and write pointers and are updated during a retransmit cycle. Data written to the FIFO after activation of RT are transmitted also. The full depth of the FIFO can be repeatedly retransmitted.
Note: 2. n = Empty Offset (Default Values: CY7C4425V n = 7, CY7C4205V n = 31, CY7C4215V n = 63, CY7C4225V/7C4235V/7C4245V n = 127). 3. m = Full Offset (Default Values: CY7C4425V n = 7, CY7C4205V n = 31, CY7C4215V n = 63, CY7C4225V/7C4235V/7C4245V n = 127).
Document #: 38-06029 Rev. *C
Page 5 of 20
CY7C4225V/4205V/4215V CY7C4425V/4235V/4245V
Width Expansion Configuration
The CY7C42X5V can be expanded in width to provide word widths greater than 18 in increments of 18. During width expansion mode all control line inputs are common and all flags are available. Empty (Full) flags should be created by ANDing the Empty (Full) flags of every FIFO. This technique will avoid ready data from the FIFO that is "staggered" by one clock cycle due to the variations in skew between RCLK and WCLK. Figure 2 demonstrates a 36-word width by using two CY7C42X5V.
RESET (RS) DATA IN (D) 36
18 18
RESET (RS) READ CLOCK (RCLK) READ ENABLE (REN) OUTPUT ENABLE(OE)
7C4425V 7C4205V 7C4215V 7C4225V 7C4235V 7C4245V
WRITE CLOCK (WCLK) WRITE ENABLE (WEN) LOAD (LD) PROGRAMMABLE(PAE) HALF FULL FLAG (HF) FF FULL FLAG (FF)
18
7C4425V 7C4205V 7C4215V 7C4225V 7C4235V 7C4245V
PROGRAMMABLE(PAF)
EMPTYFLAG (EF) EF
18
EF
FF
DATA OUT (Q)
36
FIRST LOAD (FL) WRITE EXPANSION IN (WXI) READ EXPANSION IN (RXI) Figure 1. Block Diagram of Low-Voltage Synchronous FIFO Memories Used in a Width Expansion Configuration
Depth Expansion Configuration (with Programmable Flags)
The CY7C42X5V can easily be adapted to applications requiring more than 64/256/512/1024/2048/4096 words of buffering. Figure 2 shows Depth Expansion using three CY7C42X5Vs. Maximum depth is limited only by signal loading. Follow these steps: 1. The first device must be designated by grounding the First Load (FL) control input. 2. All other devices must have FL in the HIGH state. 3. The Write Expansion Out (WXO) pin of each device must be tied to the Write Expansion In (WXI) pin of the next device. 4. The Read Expansion Out (RXO) pin of each device must be tied to the Read Expansion In (RXI) pin of the next device. 5. All Load (LD) pins are tied together. 6. The Half-Full Flag (HF) is not available in the Depth Expansion Configuration. 7. EF, FF, PAE, and PAF are created with composite flags by ORing together these respective flags for monitoring. The composite PAE and PAF flags are not precise.
Document #: 38-06029 Rev. *C
Page 6 of 20
CY7C4225V/4205V/4215V CY7C4425V/4235V/4245V
WXO RXO 7C4425V 7C4205V 7C4215V 7C4225V 7C4235V 7C4245V FF EF PAE PAF WXI RXI
FIRSTLOAD (FL)
VCC
WXO RXO 7C4425V 7C4205V 7C4215V 7C4225V 7C4235V 7C4245V FF EF PAE PAF WXI RXI
DATAIN (D) VCC
DATAOUT (Q)
FIRSTLOAD (FL)
WRITECLOCK (WCLK) WRITE ENABLE (WEN) RESET(RS)
WXO RXO 7C4425V 7C4205V 7C4215V 7C4225V 7C4235V 7C4245V FF EF
READ CLOCK (RCLK) READ ENABLE (REN) OUTPUT ENABLE (OE)
LOAD (LD) FF PAF
EF PAE
42X5V-23
PAFWXI RXIPAE FIRSTLOAD (FL)
Figure 2. Block Diagram of Low-Voltage Synchronous FIFO Memory with Programmable Flags used in Depth Expansion Configuration
Document #: 38-06029 Rev. *C
Page 7 of 20
CY7C4225V/4205V/4215V CY7C4425V/4235V/4245V
Maximum Ratings[4]
(Above which the useful life may be impaired. For user guidelines, not tested.) Storage Temperature ....................................-65C to +150C Ambient Temperature with Power Applied.................................................-55C to +125C Supply Voltage to Ground Potential .................-0.5V to +5.0V DC Voltage Applied to Outputs in High-Z State ............................................. -0.5V to VCC+0.5V DC Input Voltage .................................................... -0.5V to +5V Output Current into Outputs (LOW)............................. 20 mA Static Discharge Voltage ........................................... >2001V (per MIL-STD-883, Method 3015) Latch-up Current...................................................... >200 mA
Operating Range
Range Commercial Ambient Temperature 0C to +70C VCC 3.3V 300 mV
Electrical Characteristics Over the Operating Range
7C42X5V-15 Parameter VOH VOL VIH VIL[5] IIX IOZL IOZH ICC[6] ISB[7] Description Output HIGH Voltage Output LOW Voltage Input HIGH Voltage Input LOW Voltage Input Leakage Current Output OFF, High Z Current Operating Current Standby Current Test Conditions VCC = Min., IOH = -2.0 mA VCC = Min., IOL = 8.0 mA Low = 2.0V High = VCC +0.5V Low = -3.0V High = 0.8 V VCC = Max. OE > VIH, VSS < VO < VCC VCC = Max., IOUT = 0 mA VCC = Max., IOUT = 0 mA Com'l Com'l 2.0 -0.5 -10 -10 Min. 2.4 0.4 5.0 0.8 10 +10 30 6 2.0 -0.5 -10 -10 Max. 7C42X5V-25 Min. 2.4 0.4 5.0 0.8 10 +10 30 6 2.0 -0.5 -10 -10 Max. 7C42X5V-35 Min. 2.4 0.4 5.0 0.8 10 +10 30 6 Max. Unit V V V V A A mA mA
Capacitance[8]
Parameter CIN COUT Description Input Capacitance Output Capacitance Test Conditions TA = 25C, f = 1 MHz, VCC = 5.0V Max. 5 7 Unit pF pF
Notes: 4. The Voltage on any input or I/O pin cannot exceed the power pin during power-up 5. The VIH and VIL specifications apply for all inputs except WXI, RXI. The WXI, RXI pin is not a TTL input. It is connected to either RXO, WXO of the previous device or VSS. 6. Input signals switch from 0V to 3V with a rise/fall time less than 3 ns, clocks and clock enables switch at 20 MHz, while the data inputs switch at 10 MHz. Outputs are unloaded. 7. All inputs = VCC - 0.2V, except WCLK and RCLK, which are switching at 20 MHz. 8. Tested initially and after any design or process changes that may affect these parameters
Document #: 38-06029 Rev. *C
Page 8 of 20
CY7C4225V/4205V/4215V CY7C4425V/4235V/4245V
AC Test Loads and Waveforms[9, 10]
R1 = 330 3.3V OUTPUT CL INCLUDING JIG AND SCOPE Equivalent to: THEVENIN EQUIVALENT Rth = 200 OUTPUT R2 = 510 3.0V GND 3 ns
ALL INPUT PULSES
90% 10% 90% 10% 3 ns
Vth = 2.0V
Switching Characteristics Over the Operating Range
7C42X5V-15 Parameter tS tA tCLK tCLKH tCLKL tDS tDH tENS tENH tRS tRSR tRSF tPRT tRTR tOLZ tOE tOHZ tWFF tREF tPAFasynch tPAFsynch tPAEasynch tPAEsynch tHF Data Access Time Clock Cycle Time Clock HIGH Time Clock LOW Time. Data Set-up Time Data Hold Time Enable Set-up Time Enable Hold Time Reset Pulse Width[11] Reset Recovery Time Reset to Flag and Output Time Retransmit Pulse Width Retransmit Recovery Time Output Enable to Output in Low Z[12] Output Enable to Output Valid Output Enable to Output in High Z[12] Write Clock to Full Flag Read Clock to Empty Flag Clock to Programmable Almost-Full (Asynchronous mode, VCC/SMODE tied to VCC) Clock to Programmable Almost-Full Flag (Synchronous mode, VCC/SMODE tied to VSS) Clock to Programmable Almost-Empty Flag[13] (Asynchronous mode, VCC/SMODE tied to VCC) Clock to Programmable Almost-Full Flag (Synchronous mode, VCC/SMODE tied to VSS) Clock to Half-Full Flag Flag[13] 15 15 0 3 3 8 8 11 11 18 11 18 11 16 Description Clock Cycle Frequency 2 15 6 6 4 1 4 1 15 10 18 25 25 0 3 3 12 12 15 15 22 15 22 15 20 Min. Max. 66.7 11 2 25 10 10 6 2 6 2 25 15 25 35 35 0 3 3 15 15 20 20 25 20 25 20 25 7C42X5V-25 Min. Max. 40 15 2 35 14 14 7 2 7 2 35 20 35 7C42X5V-35 Min. Max. 28.6 20 Unit MHz ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns
Notes: 9. CL = 30 pF for all AC parameters except for t OHZ. 10. CL = 5 pF for t OHZ. 11. Pulse widths less than minimum values are not allowed. 12. Values guaranteed by design, not currently tested. 13. tPAFasynch, tPAEasynch, after program register write will not be valid until 5 ns + tPAF(E).
Document #: 38-06029 Rev. *C
Page 9 of 20
CY7C4225V/4205V/4215V CY7C4425V/4235V/4245V
Switching Characteristics Over the Operating Range (continued)
7C42X5V-15 Parameter tXO tXI tXIS tSKEW1 tSKEW2 tSKEW3 Description Clock to Expansion Out Expansion in Pulse Width Expansion in Set-up Time Skew Time between Read Clock and Write Clock for Full Flag Skew Time between Read Clock and Write Clock for Empty Flag Skew Time between Read Clock and Write Clock for Programmable Almost Empty and Programmable Almost Full Flags. 6.5 5 6 6 15 Min. Max. 10 10 10 10 10 18 7C42X5V-25 Min. Max. 15 14 15 12 12 20 7C42X5V-35 Min. Max. 20 Unit ns ns ns ns ns ns
Switching Waveforms
Write Cycle Timing
tCLK tCLKH WCLK tDS D0-D17 tENS WEN tWFF FF tSKEW1[14] RCLK tWFF tENH
NO OPERATION
tCLKL
tDH
REN
Note: 14. tSKEW1 is the minimum time between a rising RCLK edge and a rising WCLK edge to guarantee that FF will go HIGH during the current clock cycle. If the time between the rising edge of RCLK and the rising edge of WCLK is less than tSKEW1, then FF may not change state until the next WCLK edge.
Document #: 38-06029 Rev. *C
Page 10 of 20
CY7C4225V/4205V/4215V CY7C4425V/4235V/4245V
Switching Waveforms (continued)
Read Cycle Timing
tCLKH RCLK tENS REN tREF EF tA Q0-Q17 tOLZ OE
[15] tSKEW2
VALID DATA
tCLK
tCLKL
tENH
NO OPERATION
tREF
tOE
tOHZ
WCLK
WEN
Reset Timing[16]
tRS tRSR REN, WEN, LD tRSF EF,PAE tRSF FF,PAF, HF tRSF Q0-Q17 OE = 1 OE = 0
[17]
RS
Notes: 15. tSKEW2 is the minimum time between a rising WCLK edge and a rising RCLK edge to guarantee that EF will go HIGH during the current clock cycle. It the time between the rising edge of WCLK and the rising edge of RCLK is less than tSKEW2, then EF may not change state until the next RCLK edge. 16. The clocks (RCLK, WCLK) can be free-running during reset. 17. After reset, the outputs will be LOW if OE = 0 and three-state if OE = 1.
Document #: 38-06029 Rev. *C
Page 11 of 20
CY7C4225V/4205V/4215V CY7C4425V/4235V/4245V
Switching Waveforms (continued)
First Data Word Latency after Reset with Simultaneous Read and Write
WCLK tDS D0-D17 tENS WEN tSKEW2 RCLK tREF EF
[18] tFRL
D0 (FIRSTVALID WRITE)
D1
D2
D3
D4
REN tA Q0-Q17 tOLZ OE tOE tA [19] D0 D1
Empty Flag Timing
WCLK tDS D0-D17 tENS WEN tFRL[18] RCLK tSKEW2 EF REN OE tA Q0-Q17 D0 tREF tREF tSKEW2 tREF
[18] tFRL
tDS D0 tENH tENS D1 tENH
Notes: 18. When tSKEW2 > minimum specification, tFRL (maximum) = tCLK + tSKEW2. When tSKEW2 < minimum specification, tFRL (maximum) = either 2*tCLK + tSKEW2 or tCLK + tSKEW2. The Latency Timing applies only at the Empty Boundary (EF = LOW). 19. The first word is available the cycle after EF goes HIGH, always.
Document #: 38-06029 Rev. *C
Page 12 of 20
CY7C4225V/4205V/4215V CY7C4425V/4235V/4245V
Switching Waveforms (continued)
Full Flag Timing
NO WRITE WCLK tSKEW1 [14] D0-D17 tWFF FF tDS tSKEW1 [14] DATA WRITE tWFF tWFF DATA WRITE NO WRITE
WEN
RCLK tENS REN tENH tENS tENH
OE
LOW tA tA DATAREAD NEXT DATA READ
Q0-q17
DATA IN OUTPUT REGISTER
Half-Full Flag TimingtCLKH WCLK tENS tENH WEN tHF HF HALF FULL OR LESS HALF FULL+1 OR MORE tHF RCLK tENS REN tCLKL
HALF FULL OR LESS
Document #: 38-06029 Rev. *C
Page 13 of 20
CY7C4225V/4205V/4215V CY7C4425V/4235V/4245V
Switching Waveforms (continued)
Programmable Almost Empty Flag Timing
tCLKH WCLK tENS tENH WEN tPAE PAE
[20]
tCLKL
n+1 WORDS IN FIFO tPAE
n WORDS IN FIFO
RCLK tENS REN
Programmable Almost Empty Flag Timing (applies only in SMODE (SMODE is LOW)
tCLKH WCLK tENS tENH WEN PAE tSKEW3 [22] RCLK tENS REN
Notes: 20. PAE offset - n. Number of data words into FIFO already = n. 21. PAE offset - n. 22. tSKEW3 is the minimum time between a rising WCLK and a rising RCLK edge for PAE to change state during that clock cycle. If the time between the edge of WCLK and the rising RCLK is less than tSKEW3, then PAE may not change state until the next RCLK. 23. If a read is performed on this rising edge of the read clock, there will be Empty + (n-1) words in the FIFO when PAE goes LOW.
tCLKL
Note 21 tPAEsynch
N + 1 WORDS INFIFO
Note 23
tPAEsynch
tENS tENH
Document #: 38-06029 Rev. *C
Page 14 of 20
CY7C4225V/4205V/4215V CY7C4425V/4235V/4245V
Switching Waveforms (continued)
Programmable Almost Full Flag Timing
tCLKH Note 24 WCLK tENS tENH WEN tPAF PAF
[25]
tCLKL
FULL - M WORDS IN FIFO [26] tPAF
FULL - (M + 1) WORDS IN FIFO [27]
RCLK tENS REN
Programmable Almost Full Flag Timing (applies only in SMODE (SMODE in LOW))
tCLKH WCLK tENS tENH WEN Note 29 PAF FULL - (M + 1) WORDS IN FIFO tPAF FULL - M WORDS IN FIFO [26]
[30] tSKEW3
tCLKL
Note 28
tPAFsynch
RCLK tENS REN
Notes: 24. PAF offset = m. Number of data words written into FIFO already = 64 - m + 1 for the CY7C4425V, 256 - m + 1 for the CY7C4205V, 512 - m + 1 for the CY7C4215V. 1024 - m + 1 for the CY7C4225V, 2048 - m + 1 for the CY7C4235V, and 4096 - m + 1 for the CY7C4245V. 25. PAF is offset = m. 26. 64 - m words in CY7C4425V, 256 - m words inCY7C4205V, 512 - m words in CY7C4215V. 1024 - m words in CY7C4225V, 2048 - m words in CY7C4235V, and 4096 - m words in CY7C4245V. 27. 64 - m + 1 words in CY7C4425V, 256 - m + 1 words in CY7C4205V, 512 - m +1 words in CY7C4215V, 1024 - m + 1 CY7C4225V, 2048 - m + 1 in CY74235V, and 4096 - m + 1 words in CY7C4245V. 28. If a write is performed on this rising edge of the write clock, there will be Full - (m-1) words of the FIFO when PAF goes LOW. 29. PAF offset = m. 30. tSKEW3 is the minimum time between a rising RCLK and a rising WCLK edge for PAF to change state during that clock cycle. If the time between the edge of RCLK and the rising edge of WCLK is less than tSKEW3, then PAF may not change state until the next WCLK rising edge.
tENS tENH
Document #: 38-06029 Rev. *C
Page 15 of 20
CY7C4225V/4205V/4215V CY7C4425V/4235V/4245V
Switching Waveforms (continued)
Write Programmable Registers
tCLK tCLKH WCLK tENS LD tENS WEN tDS D0-D17 PAE OFFSET PAF OFFSET D0-D11 tDH PAE OFFSET tENH tCLKL
Read Programmable Registers
tCLK tCLKH RCLK tENS LD tENS REN tA Q0-Q17 UNKNOWN PAE OFFSET PAF OFFSET PAE OFFSET tENH tCLKL
Write Expansion Out Timing
tCLKH WCLK Note 31 tXO WXO tENS WEN tXO
Note: 31. Write to Last Physical Location.
Document #: 38-06029 Rev. *C
Page 16 of 20
CY7C4225V/4205V/4215V CY7C4425V/4235V/4245V
Switching Waveforms (continued)
Read Expansion Out Timing
tCLKH RCLK Note 32 tXO RXO tENS REN tXO
Write Expansion In Timing
tXI WXI
WCLK
tXIS
Read Expansion In Timing
tXI RXI tXIS
RCLK
Retransmit Timing[33, 34, 35]
FL/RT tPRT tRTR REN/WEN
EF/FF and/all async flags HF/PAE/PAF
Notes: 32. Read from Last Physical Location. 33. Clocks are free running in this case. 34. The flags may change state during Retransmit as a result of the offset of the read and write pointers, but flags will be valid at tRTR. 35. For the synchronous PAE and PAF flags (SMODE), an appropriate clock cycle is necessary after tRTR to update these flags.
Document #: 38-06029 Rev. *C
Page 17 of 20
CY7C4225V/4205V/4215V CY7C4425V/4235V/4245V
Ordering Information
64 x 18 Low-Voltage Synchronous FIFO Speed (ns) 15 25 35 Speed (ns) 15 Ordering Code CY7C4425V-15ASC CY7C4425V-25ASC CY7C4425V-35ASC Package Name A64 A64 A64 Package Name A64 A65 A64 A64 A64 Package Name A64 A64 A64 A64 Package Name A64 A64 A65 A64 A64 Package Name A64 A64 A64 A64 Package Name A64 A64 A64 A64 A64 Package Type 64-Lead 10x10 Thin Quad Flatpack 64-Lead 10x10 Thin Quad Flatpack 64-Lead 10x10 Thin Quad Flatpack Package Type 64-Lead 10x10 Thin Quad Flatpack 64-Lead 14x14 Thin Quad Flatpack 64-Lead Pb-Free 10x10 Thin Quad Flatpack 64-Lead 10x10 Thin Quad Flatpack 64-Lead 10x10 Thin Quad Flatpack Package Type 64-Lead 10x10 Thin Quad Flatpack 64-Lead Pb-Free 10x10 Thin Quad Flatpack 64-Lead 10x10 Thin Quad Flatpack 64-Lead 10x10 Thin Quad Flatpack Package Type 64-Lead 10x10 Thin Quad Flatpack 64-Lead Pb-Free 10x10 Thin Quad Flatpack 64-Lead 14x14 Thin Quad Flatpack 64-Lead 10x10 Thin Quad Flatpack 64-Lead 10x10 Thin Quad Flatpack Package Type 64-Lead 10x10 Thin Quad Flatpack 64-Lead Pb-Free 10x10 Thin Quad Flatpack 64-Lead 10x10 Thin Quad Flatpack 64-Lead 10x10 Thin Quad Flatpack Package Type 64-Lead 10x10 Thin Quad Flatpack 64-Lead Pb-Free 10x10 Thin Quad Flatpack 64-Lead 10x10 Thin Quad Flatpack 64-Lead Pb-Free 10x10 Thin Quad Flatpack 64-Lead 10x10 Thin Quad Flatpack Commercial Commercial Commercial Commercial Operating Range Commercial Commercial Commercial Operating Range Commercial Commercial Commercial Operating Range Commercial Commercial Commercial Operating Range Commercial Operating Range Commercial Commercial Commercial Operating Range Commercial
256 x 18 Low-Voltage Synchronous FIFO Ordering Code CY7C4205V-15ASC CY7C4205V-15AC CY7C4205V-15ASXC 25 35 Speed (ns) 15 25 35 Speed (ns) 15 CY7C4205V-25ASC CY7C4205V-35ASC
512 x 18 Low-Voltage Synchronous FIFO Ordering Code CY7C4215V-15ASC CY7C4215V-15ASXC CY7C4215V-25ASC CY7C4215V-35ASC
1K x 18 Low-Voltage Synchronous FIFO Ordering Code CY7C4225V-15ASC CY7C4225V-15ASXC CY7C4225V-15AC 25 35 Speed (ns) 15 25 35 Speed (ns) 15 25 35 CY7C4225V-25ASC CY7C4225V-35ASC
2K x 18 Low-Voltage Synchronous FIFO Ordering Code CY7C4235V-15ASC CY7C4235V-15ASXC CY7C4235V-25ASC CY7C4235V-35ASC
4K x 18 Low-Voltage Synchronous FIFO Ordering Code CY7C4245V-15ASC CY7C4245V-15ASXC CY7C4245V-25ASC CY7C4245V-25ASXC CY7C4245V-35ASC
Document #: 38-06029 Rev. *C
Page 18 of 20
CY7C4225V/4205V/4215V CY7C4425V/4235V/4245V
Package Diagrams
64-Pin Thin Plastic Quad Flat Pack (10 x 10 x 1.4 mm) A64 64-Pin Pb-Free Thin Plastic Quad Flat Pack (10 x 10 x 1.4 mm) A64
51-85051-*A
64-Lead Thin Plastic Quad Flat Pack (14 x 14 x 1.4 mm) A65
51-85046-*B
All product and company names mentioned in this document are the trademarks of their respective holders. Document #: 38-06029 Rev. *C Page 19 of 20
(c) Cypress Semiconductor Corporation, 2005. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.
CY7C4225V/4205V/4215V CY7C4425V/4235V/4245V
Document History Page
Document Title: CY7C4425V/4205V/4215V CY7C4225V/4235V/4245V 64/256/512/1K/2K/4K x 18 Low-Voltage Synchronous FIFOs Document Number: 38-06029 REV. ** *A *B ECN NO. 109961 122281 127856 Issue Date 12/17/01 12/26/02 08/22/03 Orig. of Change SZV RBI FSG Description of Change Change from Spec number: 38-00609 to 38-06029 Power up requirements added to Maximum Ratings Information Fixed read cycle timing diagram Corrected switching waveform diagram typos Page 12: WEN changed to REN (typo) Page 13: WCLK changed to RCLK (typo) Added Pb-Free Logo Added Pb-Free parts to ordering information: CY7C4205V-15ASXC, CY7C4215V-15ASXC, CY7C4225V-15ASXC, CY7C4235V-15ASXC, CY7C4245V-15ASXC, CY7C4245V-25ASXC
*C
393636
See ECN
YIM
Document #: 38-06029 Rev. *C
Page 20 of 20

▲Up To Search▲

Price & Availability of CY7C4215V-15ASC

	To Download CY7C4215V-15ASC Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .