2

X28HT512

PIN DESCRIPTIONS

The Address inputs select an 8-bit memory location

during a read or write operation.

Chip Enable (

CE)

The Chip Enable input must be LOW to enable all read/

write operations. When

CE is HIGH, power consumption

is reduced.

Output Enable (

OE)

The Output Enable input controls the data output buffers

and is used to initiate read operations.

Data is written to or read from the X28HT512 through the

I/O pins.

It is required to provide -3V on pin 1. This negative

voltage improves higher temperature functionality.

PIN NAMES

Symbol

Description

Address Inputs

Data Input/Output

WE

Write Enable

CE

Chip Enable

OE

Output Enable

–3V

+5V

Ground

NC

No Connect

6614 PGM T01

Write Enable (

WE)

The Write Enable input controls the writing of data to the

X28HT512.

FUNCTIONAL DIAGRAM

X BUFFERS

LATCHES AND

DECODER

I/O BUFFERS

AND LATCHES

6614 FHD F01

Y BUFFERS

LATCHES AND

DECODER

CONTROL

LOGIC AND

TIMING

512K-BIT

E2PROM

ARRAY

I/O0–I/O7

DATA INPUTS/OUTPUTS

CE

OE

VCC

VSS

A7–A15

WE

A0–A6

VBB