28A
CY7C128A
2K x 8 Static RAM
Features
• Automatic power-down when deselected
• CMOS for optimum speed/power
• High speed
— 15 ns
• Low active power
— 660 mW (commercial)
— 688 mW (military—20 ns)
• Low standby power
— 110 mW (20 ns)
• TTL-compatible inputs and outputs
• Capable of withstanding greater than 2001V electrostatic discharge
• VIH of 2.2V
Functional Description
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.
Writing to the device is accomplished when the Chip Enable
(CE) and Write Enable (WE) inputs are both LOW.
Data on the eight I/O pins (I/O0 through I/O7) is written into the
memory location specified on the address pins (A0 through
A10).
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.
The I/O pins remain in high-impedance state when Chip Enable (CE) or Output Enable (OE) is HIGH or Write Enable (WE)
is LOW.
The CY7C128A utilizes a die coat to insure alpha immunity.
The CY7C128A is a high-performance CMOS static RAM organized as 2048 words by 8 bits. Easy memory expansion is
Pin Configurations
Logic Block Diagram
DIP/SOJ/SOIC
Top View
I/O0
INPUT BUFFER
I/O3
I/O4
A4
A3
A2
A1
A0
I/O0
I/O1
I/O5
CE
WE
I/O6
POWER
DOWN
COLUMN
DECODER
I/O7
OE
A3
A2
A1
A0
VCC
A8
A9
WE
OE
A10
CE
I/O7
I/O6
I/O5
I/O4
I/O3
C128A–2
A5
A6
A7
VCC
A8
128 x 16 x 8
ARRAY
LCC
Top View
3 2 1 24 23
4
22
5
21
6
20
7 7C128A 19
8
18
9
17
10
16
11 12 13 14 15
I/O 2
GND
I/O 3
I/O 4
I/O 5
A6
A5
A4
1
24
23
2
22
3
4
21
5
20
6
19
7C128A
18
7
17
8
9
16
10
15
11
14
12
13
I/O2
SENSE AMPS
A8
A7
I/O1
ROW DECODER
A10
A9
A7
A6
A5
A4
A3
A2
A1
A0
I/O0
I/O1
I/O2
GND
C128A–1
A9
WE
OE
A10
CE
I/O7
I/O6
C128A–3
Selection Guide
7C128A-15
15
120
40
-
Maximum Access Time (ns)
Maximum Operating
Commercial
Current (mA)
Military
Maximum Standby
Commercial
Current (mA)
Military
Cypress Semiconductor Corporation
Document #: 38-05028 Rev. **
•
7C128A-20
20
120
125
20
20
3901 North First Street
•
7C128A-25
25
120
125
20
20
San Jose
•
7C128A-35
35
120
125
20
20
7C128A-45
45
120
125
20
20
CA 95134 • 408-943-2600
Revised August 24, 2001
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