AT93C46A Datasheet, PDF (1/15 Pages) ATMEL Corporation – 3-Wire Serial EEPROM 1K (64 x 16)

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)
• Three-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
• Automotive Grade, Extended Temperature, and Lead-free/Halogen-free Devices
Available
• 8-lead PDIP, 8-lead JEDEC SOIC, and 8-lead TSSOP Packages
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 opti-
mized 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-
lead PDIP, 8-lead JEDEC SOIC, and 8-lead TSSOP packages.
The AT93C46A 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 DO pin. 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 AT93C46A is available in 2.7V to 5.5V and 1.8V to 5.5V versions.
Table 1. Pin Configuration
Pin Name
Function
CS
Chip Select
SK
Serial Data Clock
DI
Serial Data Input
DO
Serial Data Output
GND
Ground
VCC
Power Supply
8-lead PDIP
CS 1
SK 2
DI 3
DO 4
8 VCC
7 DC
6 NC
5 GND
8-lead SOIC
CS 1
SK 2
DI 3
DO 4
8 VCC
7 DC
6 NC
5 GND
8-lead TSSOP
CS 1
SK 2
DI 3
DO 4
8 VCC
7 DC
6 NC
5 GND
Three-wire
Serial EEPROM
1K (64 x 16)
AT93C46A
Note: Not recommended for new
design; please refer to
AT93C46E datasheet.
Rev. 0539K–SEEPR–2/07
1