Features
• Low-Voltage and Standard-Voltage Operation
•
•
•
•
•
•
– 5.0 (VCC = 4.5V to 5.5V)
– 2.7 (VCC = 2.7V to 5.5V)
– 2.5 (VCC = 2.5V to 5.5V)
3-Wire Serial Interface
2 MHz Clock Rate (5V) Compatibility
Self-Timed Write Cycle (10 ms max)
High Reliability
– Endurance: 1 Million Write Cycles
– Data Retention: 100 Years
– ESD Protection: >4,000V
Automotive Grade and Extended Temperature Devices Available
8-Pin PDIP, 8-Pin JEDEC SOIC, and 8-Pin TSSOP Packages
3-Wire
Serial EEPROM
1K (64 x 16)
Description
The AT93C46A provides 1024 bits of serial electrically erasable programmable read
only memory (EEPROM) organized as 64 words of 16 bits each. The device is optimized for use in many industrial and commercial applications where low power and
low voltage operation are essential. The AT93C46A is available in space saving 8-pin
PDIP, 8-pin JEDEC, and 8-Pin TSSOP packages.
The AT93C46A is enabled through the Chip Select pin (CS), and accessed via a 3wire 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 selftimed 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 AT93C46A is available in 4.5V to 5.5V, 2.7V to 5.5V, and 2.5V to 5.5V versions.
8-Pin PDIP
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
NC
No Connect
DC
AT93C46A
Don’t Connect
CS
SK
DI
DO
1
2
3
4
8
7
6
5
VCC
DC
NC
GND
8-Pin SOIC
CS
SK
DI
DO
1
2
3
4
8
7
6
5
VCC
DC
NC
GND
8-Pin TSSOP
CS
SK
DI
DO
1
2
3
4
8
7
6
5
VCC
DC
NC
GND
Rev. 0539D–05/01
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