AT93C46B
Features
• x16 Organization Utilizing “No Connects” for Pins 6 and 7
• 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 Cycles
– Data Retention: 100 Years
• Automotive Grade and Extended Temperature Devices Available
• 8-Pin PDIP and JEDEC SOIC Packages
3-Wire
Serial
E2PROMs
1K (64 x 16)
Description
The AT93C46B 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 AT93C46B is available in space saving 8-pin
PDIP and 8-pin JEDEC packages.
AT93C46B
The AT93C46B 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 AT93C46B is available in 4.5V to 5.5V, 2.7V to 5.5V, and 2.5V to 5.5V versions.
Pin Configuration
8-Pin PDIP
Pin Name
CS
Function
Chip Select
CS
SK
DI
1
2
3
4
8
7
6
5
VCC
NC
SK
Serial Data Clock
Serial Data Input
Serial Data Output
Ground
DI
NC
DO
DO
GND
GND
VCC
NC
Power Supply
No Connect
8-Pin SOIC
1
8
7
6
5
CS
SK
DI
VCC
NC
2
3
4
NC
SO
GND
0917A-A–11/97
1