WCFS4016V1C Datasheet, PDF(1/9 Page) Weida Semiconductor, Inc.

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WCFS4016V1C Datasheet, PDF (1/9 Pages) Weida Semiconductor, Inc. – 256K x 16 Static RAM

S4016V1C

WCFS4016V1C

256K x 16 Static RAM

Features

â¢ High speed

â tAA = 12ns

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 WCFS4016V1C is high-performance CMOS Static RAMs

organized as 262K words by 16 bits.

Writing to the devices is accomplished by taking Chip Enable

(CE) and Write Enable (WE) inputs LOW. If Byte Low Enable

(BLE) is LOW, then data from I/O pins (I/O0 through I/O7), is

written into the location specified on the address pins (A0

through A17). If Byte High Enable (BHE) is LOW, then data

Logic Block Diagram

from I/O pins (I/O8 through I/O15) is written into the location

specified on the address pins (A0 through A17).

Reading from the devices is accomplished by taking Chip

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

Write Enable (WE) HIGH. If Byte Low Enable (BLE) is LOW,

then data from the memory location specified by the address

pins will appear on I/O0 to I/O7. If Byte High Enable (BHE) is

LOW, then data from memory will appear on I/O8 to I/O15. See

the truth table at the back of this data sheet for a complete

description of read and write modes.

The input/output pins (I/O0 through I/O15) are placed in a

high-impedance state when the device is deselected (CE

HIGH), the outputs are disabled (OE HIGH), the BHE and BLE

are disabled (BHE, BLE HIGH), or during a write operation (CE

LOW, and WE LOW).

The WCFS4016V1C is available in a standard 44-pin

400-mil-wide body width SOJ and 44-pin TSOP II package

with center power and ground pinout.

Pin Configuration

INPUT BUFFER

256K x 16

ARRAY

1024 x 4096

COLUMN

DECODER

I/O0 â I/O7

I/O8 â I/O15

BHE

BLE

SOJ

TSOP II

Top View

A0 1

A1 2

A2 3

A3 4

A4 5

CE 6

I/O0 7

I/O1 8

I/O2 9

I/O3 10

VCC 11

VSS 12

I/O4 13

I/O5 14

I/O6 15

I/O7 16

WE 17

A5 18

A6 19

A7 20

A8 21

A9 22

A17

A16

A15

BHE

BLE

I/O15

I/O14

I/O13

I/O12

VSS

VCC

I/O11

I/O10

I/O9

I/O8

A14

A13

A12

A11

A10

Selection Guide

Maximum Access Time (ns)

Maximum Operating Current (mA)

Maximum CMOS Standby Current (mA)

Commâl

WCFS4016V1C 12ns

April 12, 2002

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