1CYM1481A
CYM1481A
2048K x 8 SRAM Module
are constructed from four 512K x 8 SRAMs in plastic sur-
face-mount packages on an epoxy laminate board with pins.
On-board decoding selects one of the SRAMs from the
high-order address lines, keeping the remaining devices in
standby mode for minimum power consumption.
Features
• High-density 16-megabit SRAM modules
• High-speed CMOS SRAMs
— Access time of 70 ns
• Low active power
An active LOW write enable signal (WE) controls the writ-
ing/reading operation of the memory. When MS and WE inputs
are both LOW, data on the eight data input/output pins is writ-
ten into the memory location specified on the address pins.
Reading the device is accomplished by selecting the device
and enabling the outputs MS and OE active LOW while WE
remains inactive or HIGH. Under these conditions, the content
of the location addressed by the information on the address
pins is present on the eight data input/output pins.
— 605 mW (max.), 2M x 8
• Double-sided SMD technology
• TTL-compatible inputs and outputs
• Small footprint SIP
— PCB layout area of 0.72 sq. in.
• 2V data retention (L version)
Functional Description
The input/output pins remain in a high-impedance state unless
the module is selected, outputs are enabled, and write enable
(WE) is HIGH.
The CYM1481A is a high-performance 16-megabit static RAM
module organized as 2048K words by 8 bits. These modules
Logic Block Diagram
Pin Configuration
SIP
Top View
A
1
2
3
4
5
6
19
A –A
0
18
V
CC
512K x 8
SRAM
19
WE
I/O
2
I/O
3
OE
WE
I/O
0
A
A
A
A
7
8
9
10
11
12
13
14
1
2
3
A
–A
19 20
4
2
GND
I/O
5
512K x 8
SRAM
1 of 4
DECODER
A
10
A
11
A
5
15
16
17
18
MS
A
A
13
14
A
20
MS
19
20
21
22
23
24
25
26
27
A
A
15
16
512K x 8
SRAM
A
A
12
18
A
6
I/O
1
GND
A
0
A
7
A
8
28
29
512K x 8
SRAM
A
9
30
31
32
I/O
7
I/O
4
I/O
33
34
35
36
6
A
17
V
CC
I/O –I/O
0
7
8
OE
1481-1
/
Selection Guide
CYM1481A
Maximum Access Time (ns)
70
110
64
85
110
64
100
110
64
120
110
64
Maximum Operating Current (mA)
Maximum Standby Current (mA)
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134
•
408-943-2600
October 1990 - Revised April 16, 2001
