Features

–2.7 (V

– Endurance: 1 Million Write Cycles

– Data Retention: 100 Years

Description

The AT24C32A/64A provides 32,768/65,536 bits of serial electrically erasable and

programmable read only memory (EEPROM) organized as 4096/8192 words of 8 bits

each. The device’s cascadable feature allows up to 8 devices to share a common two-

wire bus. The device is optimized for use in many automotive applications where low

power and low voltage operation are essential. The AT24C32A/64A is available in

space saving 8-lead JEDEC SOIC and 8-lead TSSOP packages and is accessed via

a 2-wire serial interface and is available in a 2.7V (2.7V to 5.5V) version.

Table 1. Pin Configuration

Pin Name

Function

A0 – A2

Address Inputs

SDA

Serial Data

SCL

Serial Clock Input

WP

Write Protect

Two-wire

Automotive

Serial EEPROM

32K (4096 x 8)

64K (8192 x 8)

AT24C32A(1)

AT24C64A

1. AT24C32A not recommended for

new design; replaced by

AT24C32D Automotive.

2. AT24C64A not recommended for

new design; replaced by

AT24C64D Automotive.

5120D–SEEPR–6/08

8-lead SOIC

1

2

3

4

8

7

6

5

A0

A1

A2

GND

VCC

WP

SCL

SDA

8-lead TSSOP

1

2

3

4

8

7

6

5

A0

A1

A2

GND

VCC

WP

SCL

SDA