AD621ARZ Datasheet, PDF (1/21 Pages) ATMEL Corporation – Three-wire Serial Electrically Erasable Programmable Read-only Memory

Features
• Low-voltage and standard-voltage operation
– V_CC = 1.7V 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
• 2MHz clock rate (5V)
• Self-timed write cycle (5ms max)
• High reliability
– Endurance: One million write cycles
– Data retention: 100 years
• 8-lead JEDEC SOIC, 8-lead TSSOP, 8-lead UDFN, 8-lead XDFN, and 8-ball VFBGA
packages
Description
The Atmel^® AT93C56B/66B provides 2048/4096 bits of serial electrically erasable pro-
grammable read-only memory (EEPROM) organized as 128/256 words of 16 bits each
(when the ORG pin is connected to V_CC) 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 commer-
cial applications where low-power and low-voltage operations are essential. The
AT93C56B/66B is available in space-saving 8-lead JEDEC SOIC, 8-lead TSSOP, 8-lead
UDFN, 8-lead XDFN, and 8-ball VFBGA packages.
The AT93C56B/66B 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 sep-
arate 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 AT93C56B/66B operates from 1.7V to 5.5V.
8-lead SOIC
8-lead TSSOP
Figure 0-1. Pin Configurations
Pin Name
CS
Function
Chip Select
CS 1
SK 2
DI 3
DO 4
CS 1
8 VCC
SK 2
7 NC
DI 3
6 ORG
DO 4
5 GND
8 VCC
7 NC
6 ORG
5 GND
SK
Serial Data Clock
8-lead UDFN
8-lead XDFN
DI
DO
GND
VCC
ORG
NC
Serial Data Input
Serial Data Output
Ground
Power Supply
Internal Organization
No Connect
VCC 8
NC 7
ORG 6
GND 5
1 CS
2 SK
3 DI
4 DO
VCC 8
NC 7
ORG 6
GND 5
1 CS
2 SK
3 DI
4 DO
Bottom view
8-ball VFBGA
Bottom view
VCC 8
NC 7
ORG 6
GND 5
1 CS
2 SK
3 DI
4 DO
Bottom view
Three-wire
Serial Electrically
Erasable
Programmable
Read-only Memory
2K (256 x 8 or 128 x 16)
4K (512 x 8 or 256 x 16)
Atmel AT93C56B
Atmel AT93C66B
8735A–SEEPR–1/11