CY7C188 Datasheet, PDF (1/8 Pages) Cypress Semiconductor – 32K x 9 Static RAM

88
CY7C188
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 CE₁, CE₂, and OE
features
Functional Description
The CY7C188 is a high-performance CMOS static RAM orga-
nized as 32,768 words by 9 bits. Easy memory expansion is
32K x 9 Static RAM
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.
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/O_o – I/O₈) is then written into the location spec-
ified 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 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/O₀ – I/O₈) are placed in a high-im-
pedance 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
A₀
A₁
A₂
A₃
A₄
A₅
A₆
CE₁
CE₂
WE
OE
INPUT BUFFER
32K x 9
ARRAY
COLUMN
DECODER
POWER
DOWN
Selection Guide
Maximum Access Time (ns)
Maximum Operating Current (mA) Commercial
Maximum Standby Current (mA)
I/O₀
I/O₁
I/O₂
I/O₃
I/O₄
I/O₅
I/O₆
I/O₇
I/O₈
C188–1
Pin Configuration
DIP/SOJ
Top View
NC 1
NC 2
A₈ 3
A_{7 4}
A_{6 5}
A_{5 6}
A_{4 7}
A_{3 8}
A_{2 9}
A₁ 10
A_{0 11}
I/O₀ 12
I/O₁ 13
I/O_{2 14}
I/O_{3 15}
GND 16
32 ^VCC
31 A14
30 CE₂
29 WE
28 A13
27 ^A9
26 ^A10
25 ^A11
24 OE
23 A12
22 CE₁
21 I/O₈
20 I/O₇
19 I/O₆
18 I/O₅
17 I/O₄
C188–2
7C188–15
15
120
35
7C188–20
20
170
35
7C188–25
25
165
35
7C188–35
35
160
30
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
Document #: 38-05053 Rev. **
Revised August 24, 2001