© 1996 Microchip Technology Inc.

Preliminary

DS21158B-page 1

FEATURES

• SPI modes 0,0 and 1,1

• 3.0 MHz Clock Rate

• Single supply with Programming Operation down

to 2.5V

• Low Power CMOS Technology

- Max Write Current: 5.0 mA

- Read Current: 1 mA at 5.5V, 3 Mhz

- Standby Current: 1

µA typical

• 4096 x 8 Organization

• 32-Byte Page

• Sequential Read

• Self-timed ERASE and WRITE Cycles

• Block Write Protection

- Protect none, 1/4, 1/2, or all of Array

• Built-in Write Protection

- Power On/Off Data Protection Circuitry

- Write Enable Latch

- Write Protect Pin

• High Reliability

- Endurance: 1M cycles (guaranteed)

- Data Retention: >200 years

- ESD protection: >4000V

• 8-pin PDIP/SOIC, 14-pin TSSOP

• Temperature ranges supported

DESCRIPTION

The Microchip Technology Inc. 25LC320 is a 32K-bit

serial Electrically Erasable PROM (EEPROM). The

memory is accessed via a simple Serial Peripheral

Interface (SPI) compatible serial bus. The bus signals

required are a clock input (SCK) plus separate data in

(SI) and data out (SO) lines. Access to the device is

controlled through a chip select (CS) input, allowing any

number of devices to share the same bus.

There are two other inputs that provide the end user

with additional flexibility. Communication to the device

can be paused via the hold pin (HOLD). While the

device is paused, transitions on its inputs will be

ignored, with exception of chip select, allowing the host

to service higher priority interrupts. Also write opera-

tions to the Status Register can be disabled via the

write protect pin (WP).

- Commercial (C):

0

°C to

+70

°C

- Industrial (I):

-40

°C to

+85

°C

PACKAGE TYPES

BLOCK DIAGRAM

DIP/SOIC

CS

SO

WP

1

2

3

4

8

7

6

5

HOLD

SCK

SI

14

13

12

11

10

9

8

HOLD

NC

NC

NC

SCK

SI

1

2

3

4

5

6

7

CS

SO

NC

NC

NC

WP

TSSOP

SI

SO

SCK

CS

HOLD

WP

Status

Register

I/O Control

Memory

Control

Logic

X

Dec

HV Generator

EEPROM

Array

Page Latches

Y Decoder

Sense Amp.

R/W Control

Logic

Vcc

Vss

25LC320

SPI is a trademark of Motorola.

This document was created with FrameMaker404