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)
3.0 MHz Clock Rate (5V)
8-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 (10 ms max)
High Reliability
– Endurance: One Million Write Cycles
– Data Retention: 100 Years
– ESD Protection: >4000V
Automotive Grade and Extended Temperature Devices Available
8-pin PDIP and 8-lead JEDEC SOIC Package
SPI Serial
EEPROMs
1K (128 x 8)
2K (256 x 8)
4K (512 x 8)
Description
The AT25010/020/040 provides 1024/2048/4096 bits of serial electrically erasable
programmable read only memory (EEPROM) organized as 128/256/512 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 AT25010/020/040
is available in space saving 8-pin PDIP and 8-lead JEDEC (SOIC) packages.
The AT25010/020/040 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.
BLOCK WRITE protection is enabled by programming the status register with one of
four blocks of write protection. Separate program enable and program disable instructions are provided for additional data protection. Hardware data protection is provided
via the WP pin to protect against inadvertent write attempts. The HOLD pin may be
used to suspend any serial communication without resetting the serial sequence.
SPI, 1K Serial
E2PROM
Pin Configurations
Pin Name
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
8-pin PDIP
Function
AT25010
AT25020
AT25040
CS
SO
WP
GND
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
8-lead SOIC
CS
SO
WP
GND
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
Rev. 0606F–04/01
1
