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Features
? Serial Peripheral Interface (SPI) Compatible
? Supports SPI Modes 0 (0,0) and 3 (1,1)
? Low-voltage and Standard-voltage Operation
– 2.7 (V CC = 2.7V to 5.5V)
– 1.8 (V CC = 1.8V 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
Automotive Grade, Extended Temperature and Lead-Free Devices Available
8-lead PDIP, 8-lead EIAJ SOIC, 8-lead and 16-lead JEDEC SOIC, 14-lead and 20-lead
TSSOP, and 8-lead Leadless Array Packages
SPI Serial
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
AT25128 (1)
AT25256 (2)
where low-power and low-voltage operation are essential. The devices are available in
space saving 8-lead PDIP (AT25128/256), 8-lead EIAJ SOIC (AT25128/256), 8-lead
and 16-lead JEDEC SOIC (AT25128), 14-lead TSSOP (AT25128), 20-lead TSSOP
(AT25128/256), and 8-lead Leadless Array (AT25256) 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.
Table 1. Pin Configuration
14-lead TSSOP 20-lead TSSOP*
Pin Name Function
Notes:
1. This device is not rec-
ommended for new
designs. Please refer
to AT25128A.
2. This device is not rec-
ommended for new
designs. Please refer
to AT25256A.
CS
SCK
SI
SO
Chip Select
Serial Data Clock
Serial Data Input
Serial Data Output
CS
SO
NC
NC
NC
WP
GND
1
2
3
4
5
6
7
14
13
12
11
10
9
8
VCC
HOLD
NC
NC
NC
SCK
SI
NC
CS
SO
SO
NC
NC
WP
1
2
3
4
5
6
7
20
19
18
17
16
15
14
NC
VCC
HOLD
HOLD
NC
NC
SCK
GND
Ground
GND
DC
8
9
13
12
SI
DC
VCC
Power Supply
8-lead PDIP
NC
10
11
NC
WP
Write Protect
CS
1
8
VCC
8-lead Leadless Array
HOLD
NC
Suspends Serial
Input
No Connect
SO
WP
GND
2
3
4
7
6
5
HOLD
SCK
SI
VCC
HOLD
SCK
8
7
6
1
2
3
CS
SO
WP
DC
Don't Connect
16-lead SOIC
SI
5
4
GND
CS
SO
NC
NC
1
2
3
4
16
15
14
13
VCC
HOLD
NC
NC
Bottom View
8-lead SOIC
NC
NC
WP
GND
5
6
7
8
12
11
10
9
NC
NC
SCK
SI
CS
SO
WP
GND
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
*Note: Pins 3, 4 and 17, 18 are internally connected for 14-lead TSSOP socket compatibility.
Rev. 0872O–SEEPR–03/05
1
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