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CY6264_05

8K x 8 Static RAM

Cypress Semiconductor 

CY6264

8K x 8 Static RAM

Features

• 55, 70 ns access times

• 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 CY6264 is a high-performance CMOS static RAM

organized as 8192 words by 8 bits. Easy memory expansion

is provided by an active LOW chip enable (CE1), an active

HIGH chip enable (CE2), and active LOW output enable (OE)

and three-state drivers. Both devices have an automatic

power-down feature (CE1), reducing the power consumption

by over 70% when deselected. The CY6264 is packaged in a

450-mil (300-mil body) SOIC.

An active LOW write enable signal (WE) controls the

writing/reading operation of the memory. When CE1 and WE

inputs 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

addressed by the information on address pins is 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.

Logic Block Diagram

A1

A2

A3

A4

A5

A6

A7

A8

CE1

CE2

WE

OE

INPUT BUFFER

256 x 32 x 8

ARRAY

POWER

COLUMN DECODER DOWN

I/O0

I/O1

I/O2

I/O3

I/O4

I/O5

I/O6

I/O7

Pin Configuration

SOIC

Top View

NC 1

A4 2

A5 3

A6 4

A7 5

A8 6

A9 7

A10 8

A11 9

A12 10

I/O0 11

I/O1 12

I/O2 13

GND 14

28 VCC

27 WE

26 CE2

25 A3

24 A2

23 A1

22 OE

21 A0

20 CE1

19 I/O7

18 I/O6

17 I/O5

16 I/O4

15 I/O3

Cypress Semiconductor Corporation • 3901 North First Street • San Jose, CA 95134 • 408-943-2600

Document #: 001-02367 Rev. **

Revised June 27, 2005

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