WCFS4008V1C Datasheet, PDF(1/9 Page) Weida Semiconductor, Inc.

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WCFS4008V1C Datasheet, PDF (1/9 Pages) Weida Semiconductor, Inc. – 512K x 8 Static RAM

S4008V1C

WCFS4008V1C

Features

â¢ High speed

â tAA = 12 ns

â¢ 2.0V Data Retention

â¢ Automatic power-down when deselected

â¢ TTL-compatible inputs and outputs

â¢ Easy memory expansion with CE and OE features

Functional Description

The WCFS4008V1C is a high-performance CMOS Static RAM

organized as 524K words by 8 bits. Easy memory expansion

is provided by an active LOW Chip Enable (CE), an active

LOW Output Enable (OE), and three-state drivers. Writing to

the device is accomplished by taking Chip Enable (CE) and

Logic Block Diagram

512K x 8 Static RAM

Write Enable (WE) inputs LOW. Data on the eight I/O pins (I/O0

through I/O7) is then written into the location specified on the

address pins (A0 through A18).

Reading from the device is accomplished by taking Chip

Enable (CE) and Output Enable (OE) LOW while forcing Write

Enable (WE) HIGH. Under these conditions, the contents of

the memory location specified by the address pins will appear

on the I/O pins.

The eight input/output pins (I/O0 through I/O7) are placed in a

high-impedance state when the device is deselected (CE

HIGH), the outputs are disabled (OE HIGH), or during a write

operation (CE LOW, and WE LOW).

The WCFS4008V1C is available in standard 400-mil-wide

36-pin SOJ package and 44-pin TSOP II package with center

power and ground pinout.

Pin Configuration

INPUT BUFFER

512K x 8

ARRAY

A10

COLUMN

DECODER

POWER

DOWN

Selection Guide

Maximum Access Time (ns)

Maximum Operating Current (mA)

Maximum CMOS Standby Current (mA)

SOJ

Top View

TSOP II

Top View

A0 1

A1 2

A2 3

A3 4

I/O0

A4 5

CE 6

I/O1 I/O0 7

I/O1 8

I/O2 VCC 9

GND 10

I/O3 I/O2 11

I/O3 12

I/O4 WE 13

I/O5

A5 14

A6 15

A7 16

I/O6

A8 17

A9 18

I/O7

36 NC

NC 1

35 A18

NC 2

34 A17

A0 3

33 A16

A1 4

A15

A2 5

A3 6

A4 7

30 I/O7 CE 8

29 I/O6 I/O0 9

28 GND I/O1 10

VCC

I/O5

I/O4

VCC

VSS

I/O2

I/O3

24 A14 WE 15

A13

A12

A11

A10

19 NC NC 21

NC 22

44 NC

43 NC

42 NC

41 A18

40 A17

39 A16

38 A15

37 OE

36 I/O7

35 I/O6

34 VSS

33 VCC

32 I/O5

31 I/O4

30 A14

29 A13

28 A12

27 A11

26 A10

25 NC

24 NC

23 NC

Commâl

WCFS4008V1C 12ns

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