Rainbow Electronics AT25256 - Manual

1
8-lead SOIC
1
2
3
4
8
7
6
5
CS
SO
WP
GND
VCC
HOLD
SCK
SI
Features
• Serial Peripheral Interface (SPI) Compatible
• Supports SPI Modes 0 (0,0) and 3 (1,1)
• Medium-voltage and Standard-voltage Operation
– 5.0 (V
CC
= 4.5V to 5.5V)
– 2.7 (V
CC
= 2.7V to 5.5V)
• 3 MHz Clock Rate
• 64-byte Page Mode and Byte Write Operation
• Block Write Protection
– 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
– Endurance: 100,000 Write Cycles
– Data Retention: >200 Years
• 8-lead PDIP, 8-lead JEDEC SOIC and 8-lead EIAJ SOIC Packages
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-lead PDIP (AT25128/256), 8-lead JEDEC SOIC (AT25128) and 8-lead
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.
Rev. 3262C–SEEPR–6/03
SPI Serial
Automotive
EEPROMs
128K (16,384 x 8)
256K (32,768 x 8)
AT25128
AT25256
Pin Configurations
Pin Name Function
CS Chip Select
SCK Serial Data Clock
SI Serial Data Input
SO Serial Data Output
GND Ground
VCC Power Supply
WP Write Protect
HOLD Suspends Serial Input
NC No Connect
DC Don't Connect
8-lead PDIP
1
2
3
4
8
7
6
5
CS
SO
WP
GND
VCC
HOLD
SCK
SI