CY7C186 Datasheet, PDF (1/9 Pages) Cypress Semiconductor – 8Kx8 Static RAM

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CY7C186
8Kx8 Static RAM
Features
• High speed
— 20 ns
• Low active power
— 605 mW
• Low standby power
— 110 mW
• CMOS for optimum speed/power
• Easy memory expansion with CE₁, CE₂, and OE
features
• TTL-compatible inputs and outputs
• Automatic power-down when deselected
Functional Description
The CY7C186 is a high-performance CMOS static RAM orga-
nized as 8192 words by 8 bits. Easy memory expansion is
LogicBlock Diagram
A₁
A₂
AA₃₄
AA₅₆
AA₇₈
CE₁
CE₂
WE
OE
INPUT BUFFER
256 x 32 x 8
ARRAY
POWER
COLUMN DECODER DOWN
provided by an active LOW chip enable (CE₁), an active HIGH
chip enable (CE₂), and active LOW output enable (OE) and
three-state drivers. The device has an automatic power-down
feature (CE₁), reducing the power consumption by over 80%
when deselected. The CY7C186 is in a 600-mil-wide PDIP
package and a 32-pin TSOP (std. pinout).
An active LOW write enable signal (WE) controls the writ-
ing/reading operation of the memory. When CE₁ and WE in-
puts are both LOW and CE₂ is HIGH, data on the eight data
input/output pins (I/O₀ through I/O₇) is written into the memory
location addressed by the address present on the address
pins (A0 through A12). Reading the device is accomplished by
selecting the device and enabling the outputs, CE₁ and OE
active LOW, CE₂ active HIGH, while WE remains inactive or
HIGH. Under these conditions, the contents of the location ad-
dressed by the information on address pins are present on the
eight data input/output pins.
The input/output pins remain in a high-impedance state unless
the chip is selected, outputs are enabled, and write enable
(WE) is HIGH. A die coat is used to insure alpha immunity.
I/O₀
I/O₁
I/O₂
I/O₃
I/O₄
I/O₅
I/O₆
I/O₇
Pin Configuration
DIP
Top View
NC ₁
A4 2
A5 3
A_{6 4}
A_{7 5}
A_{8 6}
A_{9 7}
A10 ₈
A_{11 9}
A_{12 10}
I/O_{0 11}
I/O_{1 12}
I/O_{2 13}
GND ₁₄
28 ^VCC
27 WE
26 CE ₂
25 A3
24 ^A2
23 ^A1
22
21
OE
A₀
20 ^CE 1
19 ^I/O 7
18 ^I/O 6
17 ^I/O 5
16 ^I/O 4
15 ^I/O 3
Selection Guide^[1]
Maximum Access Time (ns)
Maximum Operating Current (mA)
Maximum Standby Current (mA)
Notes:
1. For military specifications, see the CY7C186A datasheet.
7C186-20
20
110
20/15
7C186-25
25
100
20/15
7C186-35
35
100
20/15
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
Document #: 38-05280 Rev. **
Revised March 22, 2002