AT93C56A_06 Datasheet, PDF (1/20 Pages) ATMEL Corporation – Three-wire Serial EEPROM

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)
• 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 (5V)
• Self-timed Write Cycle (10 ms Max)
• High Reliability
– Endurance: 1 Million Write Cycles
– Data Retention: 100 Years
• Automotive Devices Available
• 8-lead JEDEC PDIP, 8-lead JEDEC SOIC, 8-lead EIAJ SOIC, 8-lead Ultra Thin mini-MAP
(MLP 2x3), 8-lead TSSOP and 8-ball dBGA2 Packages
Description
The AT93C56A/66A provides 2048/4096 bits of serial electrically erasable program-
mable read-only memory (EEPROM) 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 the
ORG pin is tied to ground). The device is optimized for use in many industrial and
commercial applications where low-power and low-voltage operations are essential.
The AT93C56A/66A is available in space-saving 8-lead PDIP, 8-lead JEDEC SOIC, 8-
lead EIAJ SOIC, 8-lead Ultra Thin mini-MAP (MLP 2x3), 8-lead TSSOP, and 8-ball dBGA2
packages.
The AT93C56A/66A 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 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 and 1.8V to 5.5V versions.
Table 1. 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
ORG
Internal Organization
NC
No Connect
8-ball dBGA2
VCC 8 1 CS
CS
NC 7 2 SK
SK
ORG 6 3 DI
DI
GND 5 4 DO DO
Bottom view
8-lead Ultra Thin mini-MAP (MLP 2x3)
8-lead SOIC
1
8
2
7
3
6
4
5
8-lead PDIP
VCC
NC
ORG
GND
VCC 8
NC 7
ORG 6
GND 5
1 CS CS 1
2 SK SK 2
3 DI DI 3
4 DO DO 4
8 VCC
7 NC
6 ORG
5 GND
Bottom view
8-lead TSSOP
CS 1
8
SK 2
7
DI 3
6
DO 4
5
VCC
NC
ORG
GND
Three-wire
Serial
EEPROM
2K (256 x 8 or 128 x 16)
4K (512 x 8 or 256 x 16)
AT93C56A
AT93C66A
3378K–SEEPR–12/06
1