CY7C187_06 Datasheet, PDF (1/9 Pages) Cypress Semiconductor – 64K x 1 Static RAM

CY7C187
64K x 1 Static RAM
Features
• High speed
— 15 ns
• CMOS for optimum speed/power
• Low active power
— 495 mW
• Low standby power
— 110 mW
• TTL compatible inputs and outputs
• Automatic power-down when deselected
• Available in Pb-free and non Pb-free 22-pin (300-Mil)
Molded DIP and 24-pin (300-Mil) Molded SOJ
Logic Block Diagram
Functional Description
The CY7C187 is a high-performance CMOS static RAM
organized as 65,536 words x 1 bit. Easy memory expansion is
provided by an active LOW Chip Enable (CE) and tri-state
drivers. The CY7C187 has an automatic power-down feature,
reducing the power consumption by 56% when deselected.
Writing to the device is accomplished when the Chip Enable
(CE) and Write Enable (WE) inputs are both LOW. Data on the
input pin (D_IN) is written into the memory location specified on
the address pins (A₀ through A₁₅).
Reading the device is accomplished by taking the Chip Enable
(CE) LOW, while Write Enable (WE) remains HIGH. Under
these conditions, the contents of the memory location
specified on the address pin will appear on the data output
(D_OUT) pin.
The output pin stays in high-impedance state when Chip
Enable (CE) is HIGH or Write Enable (WE) is LOW.
The CY7C187 utilizes a die coat to insure alpha immunity.
Pin Configurations
INPUT BUFFER
A₁₂
A₁₃
A₁₄
A₁₅
16K x 1
A₀
ARRAY
A₁
A₂
A₃
COLUMN DECODER
POWER
DOWN
Selection Guide
Maximum Access Time (ns)
Maximum Operating Current (mA)
Maximum CMOS Standby Current (mA)
DI
DO
CE
WE
C187–1
SOJ
Top View
DIP
Top View
A_{0 1}
A_{1 2}
A_{2 3}
A_{3 4}
A_{4 5}
A_{5 6}
NC ₇
A_{6 8}
A_{7 9}
D_{OUT 10}
WE ₁₁
GND 12
24 ^VCC
A₀ 1
23 ^A15
A₁ 2
22 ^A14
A₂ 3
21 A₁₃
A₃ 4
20 A₁₂
A₄ 5
19 NC
A₅ 6
18 A₁₁
A₆ 7
17 A₁₀
A₇ 8
16 A9
D_OUT 9
15 A8
WE 10
14 ^DIN
13 CE
GND ¹¹
22 VCC
21 A15
20 A14
19 A₁₃
18 A12
17 A₁₁
16 _A10
15 A₉
14 _A8
13 D_IN
12 CE
C187–3
C187–2
-15
-25
-35
15
25
35
90
70
70
20
20
20
Cypress Semiconductor Corporation • 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600
Document #: 38-05044 Rev. *A
Revised July 24, 2006
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