1
Features
• Low-voltage and Standard-voltage Operation
– 2.7 (V
CC
= 2.7V to 5.5V)
– 1.8 (V
CC
= 1.8V to 5.5V)
• User-selectable Internal Organization
– 2K: 256 x 8 or 128 x 16
– 4K: 512 x 8 or 256 x 16
• 3-wire Serial Interface
• Sequential Read Operation
• 2 MHz Clock Rate (5V)
• Self-timed Write Cycle (10 ms Max)
• High Reliability
– Endurance: 1 Million Write Cycles
– Data Retention: 100 Years
• Automotive Grade, Extended Temperature and Lead-free/Halogen-free
Devices Available
• 8-lead PDIP, 8-lead JEDEC SOIC, 8-lead EIAJ SOIC, 8-lead MAP, 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 it 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-lead
EIAJ SOIC, 8-lead MAP, 8-lead TSSOP and 8-ball dBGA2™ packages.
The AT93C56A/66A is enabled through the Chip Select pin (CS), and accessed via a
3-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
3-wire Serial
EEPROMs
2K (256 x 8 or 128 x 16)
4K (512 x 8 or 256 x 16)
AT93C56A
AT93C66A
Advance
Information
Rev. 3378E–SEEPR–1/04
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
DC Don’t Connect
8-lead PDIP
1
2
3
4
8
7
6
5
CS
SK
DI
DO
VCC
DC
ORG
GND
8-lead SOIC
1
2
3
4
8
7
6
5
CS
SK
DI
DO
VCC
DC
ORG
GND
8-lead TSSOP
1
2
3
4
8
7
6
5
CS
SK
DI
DO
VCC
DC
ORG
GND
8-lead MAP
Bottom View
1
2
3
4
8
7
6
5
VCC
DC
ORG
GND
CS
SK
DI
DO
8-ball dBGA2
Bottom View
VCC
DC
ORG
GND
CS
SK
DI
DO
1
2
3
4
8
7
6
5
