AT25128 datasheet(1/22 Pages) ATMEL

Part #	AT25128

Description	SPI Serial EEPROMs

PDF	22 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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1 / 22 page

1

8-lead SOIC

1

2

3

4

8

7

6

5

CS

SO

WP

GND

VCC

HOLD

SCK

SI

Features

• Serial Peripheral Interface (SPI) Compatible

• Supports SPI Modes 0 (0,0) and 3 (1,1)

• Low-voltage and Standard-voltage Operation

– 2.7 (V

CC = 2.7V to 5.5V)

– 1.8 (V

CC = 1.8V to 5.5V)

• 3 MHz Clock Rate

• 64-byte Page Mode and Byte Write Operation

• Block Write Protection

– Protect 1/4, 1/2, or Entire Array

• Write Protect (WP) Pin and Write Disable Instructions for

Both Hardware and Software Data Protection

• Self-timed Write Cycle (5 ms Typical)

• High-reliability

– Endurance: 100,000 Write Cycles

– Data Retention: >200 Years

• Automotive Grade, Extended Temperature and Lead-Free Devices Available

• 8-lead PDIP, 8-lead EIAJ SOIC, 8-lead and 16-lead JEDEC SOIC, 14-lead and 20-lead

TSSOP, and 8-lead Leadless Array Packages

Description

The AT25128/256 provides 131,072/262,144 bits of serial electrically-erasable pro-

grammable read only memory (EEPROM) organized as 16,384/32,768 words of 8 bits

each. The device is optimized for use in many industrial and commercial applications

where low-power and low-voltage operation are essential. The devices are available in

space saving 8-lead PDIP (AT25128/256), 8-lead EIAJ SOIC (AT25128/256), 8-lead

and 16-lead JEDEC SOIC (AT25128), 14-lead TSSOP (AT25128), 20-lead TSSOP

(AT25128/256), and 8-lead Leadless Array (AT25256) packages. In addition, the entire

family is available in 2.7V (2.7V to 5.5V) and 1.8V (1.8V to 5.5V) versions.

Table 1. Pin Configuration

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

NC

No Connect

DC

Don't Connect

Rev. 0872O–SEEPR–03/05

*Note: Pins 3, 4 and 17, 18 are internally connected for 14-lead TSSOP socket compatibility.

SPI Serial

EEPROMs

128K (16,384 x 8)

256K (32,768 x 8)

AT25128(1)

AT25256(2)

Notes:

1. This device is not rec-

ommended

for

new

designs. Please refer

to AT25128A.

2. This device is not rec-

ommended

for

new

designs. Please refer

to AT25256A.

20-lead TSSOP*

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

NC

CS

SO

NC

WP

GND

DC

NC

VCC

HOLD

NC

SCK

SI

DC

NC

8-lead PDIP

1

2

3

4

8

7

6

5

CS

SO

WP

GND

VCC

HOLD

SCK

SI

16-lead SOIC

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

CS

SO

NC

WP

GND

VCC

HOLD

NC

SCK

SI

14-lead TSSOP

1

2

3

4

5

6

7

14

13

12

11

10

9

8

CS

SO

NC

WP

GND

VCC

HOLD

NC

SCK

SI

8-lead Leadless Array

Bottom View

1

2

3

4

8

7

6

5

VCC

HOLD

SCK

SI

CS

SO

WP

GND

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