Document
1CY 7C40 2
CY7C401/CY7C403 CY7C402/CY7C404
64 x 4 Cascadable FIFO 64 x 5 Cascadable FIFO
Features
• 64 x 4 (CY7C401 and CY7C403) 64 x 5 (CY7C402 and CY7C404) High-speed first-in first-out memory (FIFO) • Processed with high-speed CMOS for optimum speed/power • 25-MHz data rates • 50-ns bubble-through time—25 MHz • Expandable in word width and/or length • 5-volt power supply ± 10% tolerance, both commercial and military • Independent asynchronous inputs and outputs • TTL-compatible interface • Output enable function available on CY7C403 and CY7C404 • Capable of withstanding greater than 2001V electrostatic discharge • Pin compatible with MMI 67401A/67402A words. Both the CY7C403 and CY7C404 have an output enable (OE) function. The devices accept 4- or 5-bit words at the data input (DI0 – DIn) under the control of the shift in (SI) input. The stored words stack up at the output (DO0 – DOn) in the order they were entered. A read command on the shift out (SO) input causes the next to last word to move to the output and all data shifts down once in the stack. The input ready (IR) signal acts as a flag to indicate when the input is ready to accept new data (HIGH), to indicate when the FIFO is full (LOW), and to provide a signal for a cascading. The output ready (OR) signal is a flag to indicate the output contains valid data (HIGH), to indicate the FIFO is empty (LOW), and to provide a signal for cascading. Parallel expansion for wider words is accomplished by logically ANDing the IR and OR signals to form composite signals. Serial expansion is accomplished by tying the data inputs of one device to the data outputs of the previous device. The IR pin of the receiving device is connected to the SO pin of the sending device, and the OR pin of the sending device is connected to the SI pin of the receiving device. Reading and writing operations are completely asynchronous, allowing the FIFO to be used as a buffer between two digital machines of widely differing operating frequencies. The 25-MHz operation makes these FIFOs ideal for high-speed communication and controller applications.
Functional Description
The CY7C401 and CY7C403 are asynchronous first-in first-out (FIFOs) organized as 64 four-bit words. The CY7C402 and CY7C404 are similar FIFOs organized as 64 five-bit
Logic Block Diagram
SI IR INPUT CONTROL LOGIC
Pin Configurations
DIP
WRITE POINTER (CY7C401) NC (CY7C403) OE IR SI DI 0 DI 1 DI 2 DI 3 GND 1 16 2 15 3 14 CY7C401 4 13 CY7C403 5 12 6 11 10 7 9 8 VCC SO OR DO 0 DO 1 DO 2 DO 3 MR (CY7C402) NC (CY7C404) OE IR SI DI 0 DI 1 DI 2 DI 3 DI 4 GND
DIP
1 18 2 17 3 16 CY7C402 4 15 CY7C404 5 14 6 13 12 7 11 8 10 9 VCC SO OR DO 0 DO 1 DO 2 DO 3 DO 4 MR
WRITE MULTIPLEXER DI 0 DI 1 DI 2 DI 3 (DI 4) DATAIN MEMORY ARRAY
OUTPUT ENABLE
OE
DO0 DO1 DATAIN DO2 DO3 (DO 4)
C401–2
C401–4
LCC
LCC
MR
MASTER RESET
READ MULTIPLEXER OUTPUT CONTROL LOGIC SO OR C401–1 SI DI 0 DI 1 DI 2 NC
READ POINTER
3 2 1 2019 4 18 NC 5 17 OR CY7C401 6 CY7C403 16 DO 7 15 DO 8 14 DO 910111213
SI
0 1 2
DI DI DI DI
0 1 2 3
3 2 1 2019 4 18 OR 5 17 DO 0 6 CY7C402 16 DO 1 CY7C404 7 15 DO 2 8 14 DO 3 910111213
C401–3
C401–5
Selection Guide
7C401/2–5 Operating Frequency (MHz) Maximum Operating Current (mA) Commercial Military 5 75 7C40X–10 10 75 90 7C40X–15 15 75 90 7C40X–25 25 75 90
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134 • 408-943-2600 March 1986 – Revised April 1995
CY7C401/CY7C403 CY7C402/CY7C404
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.) Storage Temperature ................................. –65°C to +150°C Ambient Temperature with Power Applied............................................. –55°C to +125°C Supply Voltage to Ground Potential ............... –0.5V to +7.0V DC Voltage Applied to Outputs in High Z State ............................................... –0.5V to +7.0V DC Input Voltage............................................ –3.0V to +7.0V Power Dissipation ..........................................................1.0W 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 Military
[1]
Ambient Temperature 0°C to +70°C –55°C to +125°C
VCC 5V ±10% 5V ±10%
Electrical Characteristics Over the Operating Range (Unless Otherwise Noted) [2]
7C40X–10, 15, 25 Parameter VOH VOL VIH VIL IIX VCD[3] IOZ IOS ICC Description Output HIGH Voltage Output LOW Voltage Input HIGH Voltage Input LOW Voltage Input Leakage Current Input Diode Clamp Voltage[3] Output Leakage Current Output Short Circuit Current[4] Power Supply Current GND ≤ VOUT ≤ VCC, VCC = 5.5V Output Disabled (CY7C403 and CY7C404) VCC = Max., VOUT = GND VCC = Max., IOUT = 0 mA Commercial Military –50 +50 –90 75 90 µA mA mA mA GND ≤ VI ≤ VC.