88
CY7C188
32K x 9 Static RAM
Features
• High speed
— 15 ns
• Automatic power-down when deselected
• Low active power
— 660 mW
• Low standby power
— 140 mW
• CMOS for optimum speed/power
• TTL-compatible inputs and outputs
• Easy memory expansion with CE
1
, CE
2
, and OE
features
provided by an active-LOW chip enable (CE
1
), an active-HIGH
chip enable (CE
2
), an active-LOW output enable (OE), and
three-state drivers. The device has an automatic power-down
feature that reduces power consumption by more than 75%
when deselected.
Writing to the device is accomplished by taking CE
1
and write
enable (WE) inputs LOW and CE
2
input HIGH. Data on the
nine I/O pins (I/O
o
– I/O
8
) is then written into the location spec-
ified on the address pins (A
0
– A
14
).
Reading from the device is accomplished by taking CE
1
and
OE LOW while forcing WE and CE
2
HIGH. Under these con-
ditions, the contents of the memory location specified by the
address pins will appear on the I/O pins.
The nine input/output pins (I/O
0
– I/O
8
) are placed in a high-im-
pedance state when the device is deselected (CE
1
HIGH or
CE
2
LOW), the outputs are disabled (OE HIGH), or during a
write operation (CE
1
LOW, CE
2
HIGH, and WE LOW).
The CY7C188 is available in standard 300-mil-wide SOJs.
Functional Description
The CY7C188 is a high-performance CMOS static RAM orga-
nized as 32,768 words by 9 bits. Easy memory expansion is
Logic Block Diagram
Pin Configuration
DIP/SOJ
Top View
NC
NC
A
8
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
I/O
3
GND
1
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
V
CC
A
14
CE
2
WE
A
13
A
9
A
10
A
11
OE
A
12
CE
1
I/O
8
I/O
7
I/O
6
I/O
5
I/O
4
I/O
0
INPUT BUFFER
I/O
1
I/O
2
SENSE AMPS
A
0
A
1
A
2
A
3
A
4
A
5
A
6
ROW DECODER
I/O
3
I/O
4
I/O
5
32K x 9
ARRAY
C188–2
I/O
6
CE
1
CE
2
WE
OE
COLUMN
DECODER
POWER
DOWN
I/O
7
I/O
8
C188–1
Selection Guide
7C188–15
Maximum Access Time (ns)
Maximum Operating Current (mA) Commercial
Maximum Standby Current (mA)
15
120
35
7C188–20
20
170
35
7C188–25
25
165
35
7C188–35
35
160
30
Cypress Semiconductor Corporation
Document #: 38-05053 Rev. **
A
7
A
8
A
9
A
10
A
11
A
12
A
13
A
14
•
3901 North First Street
•
San Jose
•
CA 95134 • 408-943-2600
Revised August 24, 2001
CYPRESS [ CYPRESS SEMICONDUCTOR ]
