CY7C187 Datasheet, PDF (1/9 Pages) Cypress Semiconductor – 64K x 1 Static RAM

87
CY7C187
Features
• High speed
— 15 ns
• CMOS for optimum speed/power
• Low active power
— 495 mW
• Low standby power
— 220 mW
• TTL compatible inputs and outputs
• Automatic power-down when deselected
Functional Description
The CY7C187 is a high-performance CMOS static RAM orga-
nized as 65,536 words x 1 bit. Easy memory expansion is pro-
64K x 1 Static RAM
vided by an active LOW Chip Enable (CE) and three-state driv-
ers. 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 speci-
fied on the address pin will appear on the data output (D_OUT)
pin.
The output pin stays in high-impedance state when Chip En-
able (CE) is HIGH or Write Enable (WE) is LOW.
The CY7C187 utilizes a die coat to insure alpha immunity.
Logic Block Diagram
Pin Configurations
INPUT BUFFER
A₁₂
A₁₃
A₁₄
A₁₅
256 x 256
A₀
ARRAY
A₁
A₂
A₃
COLUMN DECODER
POWER
DOWN
Selection Guide^[1]
Maximum Access Time (ns)
Maximum Operating Current (mA)
Maximum Standby Current (mA)
Note:
1. For military specifications, see the CY7C187A datasheet.
DI
DO
CE
SOJ
Top View
A_{0 1}
A_{1 2}
A₂ 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
23 ^A15
22 A14
21 A₁₃
20 A₁₂
19 NC
18 A₁₁
17 A₁₀
16 A9
15 A8
14 ^DIN
13 CE
C187–3
WE
C187–1
DIP
Top View
A₀ 1
A₁ 2
A₂ 3
A₃ 4
A₄ 5
A₅ 6
A₆ 7
A₇ 8
D_OUT 9
WE 10
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
C187–2
7C187-15
15
90
40/20
7C187-20
20
80
40/20
7C187-25
25
70
20/20
7C187-35
35
70
20/20
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
Document #: 38-05044 Rev. **
Revised August 24, 2001