1
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)
• 20 MHz Clock Rate (5V)
• 32-byte Page Mode
• 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: One Million Write Cycles
– Data Retention: 100 Years
• Automotive Grade, Extended Temperature and Lead-free/Halogen-free
Devices Available
• 8-lead PDIP, 8-lead JEDEC SOIC, 8-lead MAP and 8-lead TSSOP Packages
Description
The AT25080A/160A/320A/640A provides 8192/16384/32768/65536 bits of serial
electrically-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
are essential. The AT25080A/160A/320A/640A is available in space saving 8-lead
PDIP, 8-lead JEDEC SOIC, 8-lead MAP and 8-lead TSSOP packages.
The AT25080A/160A/320A/640A 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.
SPI Serial
EEPROMs
8K (1024 x 8)
16K (2048 x 8)
32K (4096 x 8)
64K (8192 x 8)
AT25080A
AT25160A
AT25320A
AT25640A
3347G–SEEPR–7/04
Pin Configuration
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
1
2
3
4
8
7
6
5
CS
SO
WP
GND
VCC
HOLD
SCK
SI
8-lead PDIP
1
2
3
4
8
7
6
5
CS
SO
WP
GND
VCC
HOLD
SCK
SI
8-lead PDIP
1
2
3
4
8
7
6
5
CS
SO
WP
GND
VCC
HOLD
SCK
SI
8-lead TSSOP
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
CS
SO
WP
GND
8-lead MAP
