鈥?/div>
鈥?Data Sheet Describes Mode 0 Operation
Medium-voltage and Standard-voltage Operation
鈥?5.0 (V
CC
= 4.5V to 5.5V)
鈥?2.7 (V
CC
= 2.7V to 5.5V)
Extended Temperature Range
鈭?0掳C
to +125掳C
5 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 max)
High Reliability
鈥?Endurance: 100,000 Write Cycles
鈥?Data Retention: >100 Years
8-lead PDIP, 8-lead JEDEC SOIC, and 8-lead TSSOP Packages
SPI Serial
Extended
Temperature
EEPROMs
128K (16,384 x 8)
256K (32,768 x 8)
Description
The AT25128A/256A 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 automotive applications
where low-power and low-voltage operation are essential. The devices are available in
space-saving 8-lead PDIP, 8-lead JEDEC SOIC, and 8-lead TSSOP packages.
The AT25128A/256A is enabled through the Chip Select pin (CS) and accessed via a
three-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 sepa-
rate erase cycle is required before write.
Table 1.
Pin Configurations
Pin Name
CS
SCK
SI
SO
GND
VCC
WP
HOLD
NC
DC
AT25128A
AT25256A
8-Lead
PDIP
CS
SO
WP
GND
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
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
CS
SO
WP
GND
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
8-lead SOIC
8-lead
TSSOP
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
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