CY7C128A
2K x 8 Static RAM
provided by an active LOW Chip Enable (CE), and active LOW
Output Enable (OE) and three-state drivers. The CY7C128A
has an automatic power-down feature, reducing the power
consumption by 83% when deselected.
Features
• Automatic power-down when deselected
• CMOS for optimum speed/power
• High speed
Writing to the device is accomplished when the Chip Enable
(CE) and Write Enable (WE) inputs are both LOW.
— 15 ns
Data on the eight I/O pins (I/O through I/O ) is written into the
• Low active power
0
7
memory location specified on the address pins (A through
0
— 660 mW (commercial)
— 688 mW (military—20 ns)
• Low standby power
A
).
10
Reading the device is accomplished by taking Chip Enable
(CE) and Output Enable (OE) LOW while Write Enable (WE)
remains HIGH. Under these conditions, the contents of the
memory location specified on the address pins will appear on
the eight I/O pins.
— 110 mW (20 ns)
• TTL-compatible inputs and outputs
• Capable ofwithstanding greaterthan 2001V electrostat-
ic discharge
The I/O pins remain in high-impedance state when Chip En-
able (CE) or Output Enable (OE) is HIGH or Write Enable (WE)
is LOW.
• V of 2.2V
IH
Functional Description
The CY7C128A utilizes a die coat to insure alpha immunity.
The CY7C128A is a high-performance CMOS static RAM or-
ganized as 2048 words by 8 bits. Easy memory expansion is
Pin
Logic Block Diagram
Configurations
DIP/SOJ/SOIC
Top View
A
V
CC
1
24
23
22
7
A
A
A
A
8
A
9
2
3
4
5
6
7
8
9
6
5
4
WE
OE
21
20
19
18
17
A
A
A
3
2
1
0
0
A
10
7C128A
CE
I/O
A
7
I/O
I/O
6
0
I/O
16
15
14
13
INPUT BUFFER
I/O
I/O
10
11
12
I/O
I/O
GND
5
1
2
4
I/O
1
A
10
I/O
3
A
9
I/O
2
C128A–2
A
LCC
8
Top View
A
7
I/O
3
128 x 16 x 8
ARRAY
A
6
I/O
4
A
5
3 2 1 2423
4
5
6
7
8
9
22
A
A
4
9
A
4
I/O
21
20
19
18
17
16
A
WE
OE
10
CE
5
3
2
A
A
A
1
7C128A
CE
WE
I/O
A
6
0
POWER
DOWN
COLUMN
DECODER
I/O
0
I/O
7
10
I/O
1
I/O
6
I/O
11 12 13 14 15
7
OE
C128A–3
C128A–1
A
3
A
2
A
1
A
0
Selection Guide
7C128A-15
7C128A-20
7C128A-25
7C128A-35
7C128A-45
Maximum Access Time (ns)
15
120
-
20
120
125
20
25
120
125
20
35
120
125
20
45
120
125
20
Maximum Operating
Current (mA)
Commercial
Military
Maximum Standby
Current (mA)
Commercial
Military
40
-
20
20
20
20
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134
•
408-943-2600
February 3, 2000