1

Features

– 2K: 256 x 8 or 128 x 16

– 4K: 512 x 8 or 256 x 16

– Endurance: 1 Million Write Cycles

– Data Retention: 100 Years

(MLP 2x3), 8-lead TSSOP and 8-ball dBGA2 Packages

Description

The AT93C56A/66A provides 2048/4096 bits of serial electrically erasable program-

mable read-only memory (EEPROM) organized as 128/256 words of 16 bits each

(when the ORG pin is connected to VCC) and 256/512 words of 8 bits each (when the

ORG pin is tied to ground). The device is optimized for use in many industrial and

commercial applications where low-power and low-voltage operations are essential.

The AT93C56A/66A is available in space-saving 8-lead PDIP, 8-lead JEDEC SOIC, 8-

packages.

The AT93C56A/66A is enabled through the Chip Select pin (CS) and accessed via a

three-wire serial interface consisting of Data Input (DI), Data Output (DO), and Shift

Clock (SK). Upon receiving a read instruction at DI, the address is decoded and the

data is clocked out serially on the data output pin DO. The write cycle is completely

self-timed and no separate erase cycle is required before write. The write cycle is only

enabled when the part is in the Erase/Write Enable State. When CS is brought “high”

following the initiation of a write cycle, the DO pin outputs the Ready/Busy status of

the part.

The AT93C56A/66A is available in 2.7V to 5.5V and 1.8V to 5.5V versions.

Table 1. Pin Configurations

Pin Name

Function

CS

Chip Select

SK

Serial Data Clock

DI

Serial Data Input

DO

Serial Data Output

GND

Ground

VCC

Power Supply

ORG

Internal Organization

NC

No Connect

Three-wire

Serial

EEPROM

2K (256 x 8 or 128 x 16)

4K (512 x 8 or 256 x 16)

AT93C56A

AT93C66A

3378K–SEEPR–12/06

VCC

NC

ORG

GND

CS

SK

DI

DO

1

2

3

4

8

7

6

5

8-ball dBGA2

Bottom view

1

2

3

4

8

7

6

5

CS

SK

DI

DO

VCC

NC

ORG

GND

8-lead SOIC

1

2

3

4

8

7

6

5

VCC

NC

ORG

GND

CS

SK

DI

DO

8-lead Ultra Thin mini-MAP (MLP 2x3)

Bottom view

1

2

3

4

8

7

6

5

CS

SK

DI

DO

VCC

NC

ORG

GND

8-lead PDIP

1

2

3

4

8

7

6

5

CS

SK

DI

DO

VCC

NC

ORG

GND

8-lead TSSOP