CY7C188_06 Datasheet, PDF (1/7 Pages) Cypress Semiconductor – 32K x 9 Static RAM

CY7C188
32K x 9 Static RAM
Features
• High speed
— 15 ns
• Automatic power-down when deselected
• Low active power
— 660 mW
• Low standby power
— 55 mW
• CMOS for optimum speed/power
• TTL-compatible inputs and outputs
• Easy memory expansion with CE₁, CE₂, and OE
features
• Available in non Pb-free 32-Lead (300-Mil) Molded SOJ
Logic Block Diagram
Functional Description
The CY7C188 is a high-performance CMOS static RAM
organized as 32,768 words by 9 bits. Easy memory expansion
is provided by an active-LOW chip enable (CE₁), an
active-HIGH chip enable (CE₂), an active-LOW output enable
(OE), and tri-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
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 condi-
tions, 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-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 SOJ.
Pin Configuration
A₀
A₁
A₂
A₃
A₄
A₅
A₆
CE₁
CE₂
WE
OE
INPUT BUFFER
32K x 9
ARRAY
COLUMN
DECODER
POWER
DOWN
I/O₀
I/O₁
I/O₂
I/O₃
I/O₄
I/O₅
I/O₆
I/O₇
I/O₈
C188–1
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
Cypress Semiconductor Corporation • 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600
Document #: 38-05053 Rev. *A
Revised September 28, 2006