X20C04DM datasheet(2/15 Pages) XICOR

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X20C04

PIN DESCRIPTIONS

Addresses (A0–A8)

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 and recall operations. Output

Enable LOW disables a store operation regardless of

the state of

CE, WE, or NE.

Data In/Data Out (I/O0–I/O7)

Data is written to or read from the X20C04 through the

I/O pins. The I/O pins are placed in the high impedance

state when either

CE or OE is HIGH or when NE is LOW.

Write Enable (

WE)

The Write Enable input controls the writing of data to

both the static RAM and stores to the E2PROM.

Nonvolatile Enable (

NE)

The Nonvolatile Enable input controls all accesses to

the E2PROM array (store and recall functions).

PIN NAMES

Symbol

Description

A0–A8

Address Inputs

I/O0–I/O7

Data Input/Output

Write Enable

Chip Enable

Output Enable

Nonvolatile Enable

VCC

+5V

VSS

Ground

No Connect

3825 PGM T01

VCC SENSE

ROW

SELECT

CONTROL

LOGIC

COLUMN

SELECT

I/OS

EEPROM ARRAY

512 x 8

SRAM

ARRAY

A3–A6

I/O0–I/O7

A0–A2

A7–A8

3825 FHD F01

FUNCTIONAL DIAGRAM

X20C04DM Datasheet(PDF) 2 Page - Xicor Inc.

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