Features

– Datasheet Describes Mode 0 Operation

– 1.8 (V

– Protect 1/4, 1/2, or Entire Array

Data Protection

– Endurance: One Million Write Cycles

– Data Retention: 100 Years

Description

programmable read-only memory (EEPROM) organized as 4096/8192 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 AT25320B/640B is

available in space-saving 8-lead JEDEC SOIC, 8-lead UDFN, 8-lead XDFN, 8-lead

TSSOP, and 8-ball VFBGA packages.

The AT25320B/640B 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 sepa-

rate erase cycle is required before write.

Table 0-1.

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

HOLD

SCK

SI

CS

SO

WP

GND

4

3

2

1

5

6

7

8

8-lead UDFN

Bottom View

CS

SO

WP

GND

1

2

3

4

8

7

6

5

8-lead SOIC

HOLD

SCK

SI

8-lead TSSOP

1

2

3

4

8

7

6

5

CS

SO

WP

GND

HOLD

SCK

SI

HOLD

SCK

SI

CS

SO

WP

GND

1

2

3

4

8

7

6

5

8-ball VFBGA

Bottom View

HOLD

SCK

SI

CS

SO

WP

GND

4

3

2

1

5

6

7

8

8-lead XDFN

Bottom View

SPI Serial

EEPROMs

32K (4096 x 8)

64K (8192 x 8)

Atmel

AT25320B

AT25640B

8535F–SEEPR–6/10