AT93C56A_07 Datasheet, PDF (1/14 Pages) ATMEL Corporation – Three-wire Automotive Temperature Serial EEPROMs

Features
• Medium-voltage and Standard-voltage Operation
– 2.7 (V_CC = 2.7V to 5.5V)
• Automotive Temperature Range –40°C to 125°C
• User-selectable Internal Organization
– 2K: 256 x 8 or 128 x 16
– 4K: 512 x 8 or 256 x 16
• Three-wire Serial Interface
• Sequential Read Operation
• 2 MHz Clock Rate
• Self-timed Write Cycle (10 ms max)
• High Reliability
– Endurance: 1 Million Write Cycles
– Data Retention: 100 Years
• Lead-free/Halogen-free Devices Available
• 8-lead JEDEC SOIC and 8-lead TSSOP Packages
Description
The AT93C56A/66A provides 2048/4096 bits of serial electrically-erasable program-
mable read-only memory (EEPROM). The EEPROM is 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 automotive
applications where low-power and low-voltage operations are essential. The
AT93C56A/66A is available in space-saving 8-lead JEDEC SOIC and 8-lead TSSOP
packages.
The AT93C56A/66A is enabled through the Chip Select (CS) pin 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 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 AT93C56A/66A is available in 2.7V 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
ORG
Internal Organization
DC
Don’t Connect
8-lead SOIC
CS 1
SK 2
DI 3
DO 4
8 VCC
7 DC
6 ORG
5 GND
8-lead TSSOP
CS 1
SK 2
DI 3
DO 4
8 VCC
7 DC
6 ORG
5 GND
Three-wire
Automotive
Temperature
Serial
EEPROMs
2K (256 x 8 or 128 x 16)
4K (512 x 8 or 256 x 16)
AT93C56A
AT93C66A
Rev. 5091D–SEEPR–2/07
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