88
CY7C188
32K x 9 Static RAM
Features
provided by an active-LOW chip enable (CE1), an active-HIGH
chip enable (CE2), 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.
• 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 CE1, CE2, and OE
features
Writing to the device is accomplished by taking CE1 and write
enable (WE) inputs LOW and CE2 input HIGH. Data on the
nine I/O pins (I/Oo – I/O8) is then written into the location specified on the address pins (A0 – A14).
Reading from the device is accomplished by taking CE1 and
OE LOW while forcing WE and CE2 HIGH. Under these conditions, the contents of the memory location specified by the
address pins will appear on the I/O pins.
Functional Description
The CY7C188 is a high-performance CMOS static RAM organized as 32,768 words by 9 bits. Easy memory expansion is
The nine input/output pins (I/O0 – I/O8) are placed in a high-impedance state when the device is deselected (CE1 HIGH or
CE2 LOW), the outputs are disabled (OE HIGH), or during a
write operation (CE1 LOW, CE2 HIGH, and WE LOW).
The CY7C188 is available in standard 300-mil-wide SOJs.
Logic Block Diagram
Pin Configuration
DIP/SOJ
Top View
NC
NC
A8
A7
A6
A5
A4
A3
A2
A1
A0
I/O0
INPUT BUFFER
SENSE AMPS
I/O2
ROW DECODER
A0
A1
A2
A3
A4
A5
A6
I/O1
32K x 9
ARRAY
I/O0
I/O1
I/O2
I/O3
GND
I/O3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
I/O4
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
VCC
A14
CE2
WE
A13
A9
A10
A11
OE
A12
CE1
I/O8
I/O7
I/O6
I/O5
I/O4
I/O5
C188–2
I/O6
CE1
CE2
WE
OE
POWER
DOWN
COLUMN
DECODER
I/O7
A7
A8
A9
A 10
A 11
A 12
A 13
A 14
I/O8
C188–1
Selection Guide
7C188–20
7C188–25
7C188–35
Maximum Access Time (ns)
7C188–15
15
20
25
35
Maximum Operating Current (mA) Commercial
120
170
165
160
Maximum Standby Current (mA)
35
35
35
30
Cypress Semiconductor Corporation
Document #: 38-05053 Rev. **
•
3901 North First Street
•
San Jose
•
CA 95134 • 408-943-2600
Revised August 24, 2001
