鈥?/div>
鈥?5.0 (V
CC
= 4.5V to 5.5V)
鈥?2.7 (V
CC
= 2.7V to 5.5V)
3 MHz Clock Rate
64-byte Page Mode and Byte Write Operation
Block Write Protection
鈥?Protect 1/4, 1/2, or Entire Array
Write Protect (WP) Pin and Write Disable Instructions for
both Hardware and Software Data Protection
Self-timed Write Cycle (5 ms Typical)
High-reliability
鈥?Endurance: 100,000 Write Cycles
鈥?Data Retention: >200 Years
8-pin PDIP, 8-pin JEDEC SOIC and 8-pin EIAJ SOIC Packages
SPI Serial
Automotive
EEPROMs
128K (16,384 x 8)
256K (32,768 x 8)
Description
The AT25128/256 provides 131,072/262,144 bits of serial electrically-erasable pro-
grammable read only memory (EEPROM) organized as 16,384/32,768 words of 8 bits
each. The device is optimized for use in many industrial and commercial applications
where low-power and low-voltage operation are essential. The devices are available in
space saving 8-pin PDIP (AT25128/256), 8-pin JEDEC SOIC (AT25128) and 8-pin
EIAJ SOIC (AT25256) packages. In addition, the entire family is available in 5.0V
(4.5V to 5.5V) and 2.7V (2.7V to 5.5V) versions.
Continued
AT25128
AT25256
Pin Configurations
Pin Name
CS
SCK
SI
SO
GND
VCC
WP
HOLD
NC
DC
Function
Chip Select
Serial Data Clock
Serial Data Input
Serial Data Output
Ground
Power Supply
Write Protect
Suspends Serial Input
No Connect
Don't Connect
CS
SO
WP
GND
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
8-pin PDIP
CS
SO
WP
GND
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
8-pin SOIC
Rev. 3262A鈥揝EEPR鈥?2/02
1