Features
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Serial Peripheral Interface (SPI) Compatible
Supports SPI Modes 0 (0,0) and 3 (1,1)
Data Sheet Describes Mode 0 Operation
Low-voltage and Standard-voltage Operation
– 2.7 (VCC = 2.7V to 5.5V)
– 1.8 (VCC = 1.8V to 5.5V)
20 MHz Clock Rate (5V)
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 Max)
High-reliability
– Endurance: 1 Million Write Cycles
– Data Retention: >100 Years
8-lead PDIP, 8-lead EIAJ SOIC, 8-lead JEDEC SOIC, 8-lead TSSOP, 8-ball dBGA2 and 8lead Ultra Thin SAP Packages
Lead-free/Halogen-free
Available in Automotive
Die Sales: Wafer Form, Waffle Pack, and Bumped Die
Description
The AT25128A/256A provides 131,072/262,144 bits of serial electrically-erasable programmable 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, 8-lead EIAJ SOIC, 8-lead JEDEC SOIC, 8-lead TSSOP,
8-ball dBGA2 and 8-lead SAP packages. In addition, the entire family is available in
2.7V (2.7V to 5.5V) and 1.8V (1.8V to 5.5V) versions.
SPI Serial
EEPROMs
128K (16,384 x 8)
256K (32,768 x 8)
AT25128A
AT25256A
Not
Recommended
for New Design
The AT25128A/256A is enabled through the Chip Select pin (CS) and accessed via a
3-wire interface consisting of Serial Data Input (SI), Serial Data Output (SO), and
Serial Clock (SCK). All programming cycles are completely self-timed, and no separate Erase cycle is required before Write.
8-lead SOIC
8-lead PDIP
CS
SO
WP
GND
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
CS
SO
WP
GND
1
2
3
4
8
7
6
5
8-lead Ultra Thin SAP
VCC
HOLD
SCK
SI
8
7
6
5
1
2
3
4
Bottom View
CS
SO
WP
GND
8-lead TSSOP
CS
VCC
SO
HOLD
WP
SCK
GND
SI
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
8-ball dBGA2
VCC
8
1
CS
HOLD
SCK
SI
7
2
6
3
5
4
SO
WP
GND
Bottom View
3368J–SEEPR–06/07