64
CYM1464
512Kx8 Static RAM Module
Features
鈥?High-density 4-megabit SRAM module
鈥?High-speed CMOS SRAMs
鈥?Access time of 20 ns
鈥?Low active power
鈥?1.93W (max.)
鈥?JEDEC-compatible pinout
鈥?32-pin, 0.6-inch-wide DIP package
鈥?TTL-compatible inputs and outputs
鈥?Low profile
鈥?Max. height of 0.34 inches
constructed using four 256K x 4 static RAMs in SOJ packages
mounted on an epoxy laminate substrate with pins.
Writing to the module is accomplished when the chip select
(CS) and write enable (WE) inputs are both LOW. Data on the
eight input/output pins (I/O
0
through I/O
7
) of the device is writ-
ten into the memory location specified on the address pins (A
0
through A
18
). Reading the device is accomplished by taking
chip select and output enable (OE) LOW, while write enable
(WE) remains inactive or HIGH. Under these conditions, the
contents of the memory location specified on the address pins
(A
0
through A
18
) will appear on the eight appropriate data in-
put/output pins (I/O
0
through I/O
7
).
The input/output pins remain in a high-impedance state unless
the module is selected, outputs are enabled, and write enable
(WE) is HIGH.
Functional Description
The CYM1464 is a high-performance 4-megabit static RAM
module organized as 512K words by 8 bits. This module is
Logic Block Diagram
A
0
鈭?/div>
A
17
WE
OE
256K x 4
SRAM
256K x 4
SRAM
Pin Configuration
DIP
Top View
A
18
A
16
A
14
A
12
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
I/O
0
I/O
1
I/O
2
GND
I/O
0
鈭?/div>
I/O
7
1
S
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
A
18
CS
1 OF 2
DECODER
256K x 4
SRAM
256K x 4
SRAM
V
CC
A
15
A
17
WE
A
13
A
8
A
9
A
11
OE
A
10
CS
I/O
7
I/O
6
I/O
5
I/O
4
I/O
3
Selection Guide
1464-20
Maximum Access Time (ns)
Maximum Operating Current (mA)
Maximum Standby Current (mA)
20
350
240
1464-22
22
350
240
1464-25
25
1464-30
30
300
240
1464-35
35
1464-45
45
300
240
1464-55
55
Cypress Semiconductor Corporation
Document #: 38-05272 Rev. **
鈥?/div>
3901 North First Street
鈥?/div>
San Jose
鈥?/div>
CA 95134 鈥?408-943-2600
Revised March 15, 2002
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