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
• Schmitt Trigger, Filtered Inputs for Noise Suppression
• 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: > 4000V
3-Wire
Serial EEPROM
1K (64 x 16)
• Automotive Grade and Extended Temperature Devices Available
• 8-Pin PDIP and JEDEC SOIC Packages
Description
The AT93C46C provides 1024 bits of serial electrically-erasable programmable read
only memory (EEPROM) organized as 64 words of 16 bits each. The device is opti-
mized for use in many industrial and commercial applications where low-power and
low-voltage operation are essential. The AT93C46C is available in space saving 8-pin
PDIP and 8-pin JEDEC packages.
AT93C46C
The AT93C46C 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
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 AT93C46C 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
3-Wire, 1K
Serial E2PROM
CS
SK
DI
1
2
3
4
8
7
6
5
VCC
DC
CS
Chip Select
NC
SK
Serial Data Clock
Serial Data Input
Serial Data Output
Ground
DO
GND
DI
DO
GND
VCC
NC
DC
8-Pin SOIC
Power Supply
No Connect
CS
1
8
7
6
5
VCC
SK
DI
2
3
4
DC
Don’t Connect
NC
DO
GND
Rev. 1122A–07/98
1