Features
• Serial Peripheral Interface (SPI) Compatible
• Supports SPI Modes 0 (0,0) and 3 (1,1)
• Low Voltage and Standard Voltage Operation
– 5.0 (VCC = 4.5V to 5.5V)
– 2.7 (VCC = 2.7V to 5.5V)
– 1.8 (VCC = 1.8V to 3.6V)
• 2.1 MHz Clock Rate
• 32-Byte Page Mode
• Block Write Protection
– Protect 1/4, 1/2, or Entire Array
SPI Serial
EEPROMs
8K (1024 x 8)
16K (2048 x 8)
32K (4096 x 8)
64K (8192 x 8)
• 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: 1 Million Write Cycles
– Data Retention: 100 Years
– ESD Protection: >4000V
• Automotive Grade and Extended Temperature Devices Available
• 8-Pin PDIP, JEDEC SOIC, and 14-Pin and 20-Pin TSSOP Packages
Description
The AT25080/160/320/640 provides 8192/16384/32768/65536 bits of serial electri-
cally erasable programmable read only memory (EEPROM) organized as
1024/2048/4096/8192 words of 8 bits each. The device is optimized for use in many
industrial and commercial applications where low power and low voltage operation
AT25080
AT25160
AT25320
AT25640
(continued)
Pin Configuration
Pin Name
Function
8-Pin PDIP
8-Pin SOIC
CS
Chip Select
CS
SO
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
CS
SO
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
SCK
SI
Serial Data Clock
Serial Data Input
Serial Data Output
Ground
WP
WP
GND
GND
SO
GND
VCC
Power Supply
Write Protect
Suspends Serial Input
No Connect
WP
14-Lead TSSOP
20-Lead TSSOP*
HOLD
NC
CS
1
2
3
4
5
6
7
14
13
12
11
10
9
VCC
HOLD
NC
NC
CS
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
NC
SO
NC
VCC
HOLD
HOLD
NC
SO
NC
NC
SO
NC
NC
NC
DC
Don’t Connect
WP
GND
SCK
SI
NC
NC
8
WP
GND
DC
SCK
SI
DC
NC
NC
Rev. 0675C–08/98
*Pins 3, 4 and 17, 18 are internally connected for 14-lead TSSOP socket compatibility.
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