© 1998 Microchip Technology Inc.

DS21203C-page 1

M

24AA256/24LC256

DEVICE SELECTION TABLE

FEATURES

• Low power CMOS technology

- Maximum write current 3 mA at 5.5V

- Maximum read current 400

µA at 5.5V

- Standby current 100 nA typical at 5.5V

• Cascadable for up to eight devices

• Self-timed ERASE/WRITE cycle

• 64-byte page-write mode available

• 5 ms max write-cycle time

• Hardware write protect for entire array

• Schmitt trigger inputs for noise suppression

• 100,000 erase/write cycles guaranteed

• Electrostatic discharge protection > 4000V

• Data retention > 200 years

• 8-pin PDIP and SOIC (208 mil) packages

• Temperature ranges:

DESCRIPTION

The Microchip Technology Inc. 24AA256/24LC256

(24xx256*) is a 32K x 8 (256K bit) Serial Electrically

Erasable PROM, capable of operation across a broad

voltage range (1.8V to 5.5V). It has been developed for

advanced, low power applications such as personal

communications or data acquisition. This device also

has a page-write capability of up to 64 bytes of data.

This device is capable of both random and sequential

reads up to the 256K boundary. Functional address

lines allow up to eight devices on the same bus, for up

to 2 Mbit address space. This device is available in the

standard 8-pin plastic DIP, and 8-pin SOIC (208 mil)

packages.

PACKAGE TYPE

BLOCK DIAGRAM

Part

Number

Range

Max Clock

Frequency

Temp

Ranges

24AA256

1.8-5.5V

I

24LC256

2.5-5.5V

I, E

- Industrial (I):

-40

°C to +85°C

- Automotive (E):

-40

°C to +125°C

A0

A1

A2

Vss

Vcc

WP

SCL

SDA

1

2

3

4

8

7

6

5

PDIP

A0

A1

A2

WP

SCL

SDA

1

2

3

4

8

7

6

5

SOIC

HV GENERATOR

EEPROM

ARRAY

PAGE LATCHES

YDEC

XDEC

SENSE AMP

R/W CONTROL

MEMORY

CONTROL

LOGIC

I/O

CONTROL

LOGIC

A0…A2

SDA

SCL

WP

I/O

*24xx256 is used in this document as a generic part number for the 24AA256/24LC256 devices.