1

Features

– Data Sheet Describes Mode 0 Operation

−40°C to +125°C

– Protect 1/4, 1/2, or Entire Array

Data Protection

– Endurance: One Million Write Cycles

– Data Retention: 100 Years

Description

The AT25010A/020A/040A provides 1024/2048/4096 bits of serial electrically-eras-

able programmable read-only memory (EEPROM) organized as 128/256/512 words of

8 bits each. The device is optimized for use in many automotive applications where

low-power and low-voltage operation are essential. The AT25010A/020A/040A is

available in space-saving 8-pin PDIP, 8-lead JEDEC SOIC and 8-lead TSSOP

packages.

The AT25010A/020A/040A is enabled through the Chip Select pin (CS) and accessed

via a three-wire interface consisting of Serial Data Input (SI), Serial Data Output (SO),

and Serial Clock (SCK). All programming cycles are completely self-timed, and no

separate erase cycle is required before write.

Block write protection is enabled by programming the status register with one of four

blocks of write protection. Separate program enable and program disable instructions

are provided for additional data protection. Hardware data protection is provided via

the WP pin to protect against inadvertent write attempts. The HOLD pin may be used

to suspend any serial communication without resetting the serial sequence.

Table 1. Pin Configurations

Pin Name

Function

CS

Chip Select

SCK

Serial Data Clock

SI

Serial Data Input

SO

Serial Data Output

GND

Ground

VCC

Power Supply

WP

Write Protect

HOLD

Suspends Serial Input

SPI Serial

Extended

Temperature

EEPROMs

1K (128 x 8)

2K (256 x 8)

4K (512 x 8)

AT25010A

AT25020A

AT25040A

5087B–SEEPR–1/05

1

2

3

4

8

7

6

5

CS

SO

WP

GND

VCC

HOLD

SCK

SI

1

2

3

4

8

7

6

5

CS

SO

WP

GND

VCC

HOLD

SCK

SI

8-lead PDIP

8-lead SOIC

1

2

3

4

8

7

6

5

CS

SO

WP

GND

VCC

HOLD

SCK

SI

8-lead TSSOP