Features
• Serial Peripheral Interface (SPI) Compatible
• Supports SPI Modes 0 (0,0) and 3 (1,1)
– Data Sheet Describes Mode 0 Operation
• Low-voltage and Standard-voltage Operation
– 2.7 (VCC = 2.7V to 5.5V)
– 1.8 (VCC = 1.8V to 5.5V)
• 20 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 (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
SPI Serial
EEPROMs
1K (128x8)
2K (256x8)
• 8-lead PDIP, 8-lead JEDEC SOIC, 8-lead MAP and 8-lead TSSOP Packages
4K (512x8)
Description
AT25010A
AT25020A
AT25040A
The AT25010A/020A/040A provides 1024/2048/4096 bits of serial electrically eras-
able 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 appli-
cations where low-power and low-voltage operation are essential. The
AT25010A/020A/040A is available in space saving 8-lead PDIP, 8-lead JEDEC SOIC,
8-lead MAP, and 8-lead TSSOP packages.
The AT25010A/020A/040A 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
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.
Table 1. Pin Configuration
8-lead SOIC
8-lead PDIP
Pin Name
CS
Function
Chip Select
CS
SO
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
CS
SO
1
8
7
6
5
VCC
HOLD
SCK
SI
2
3
4
SCK
SI
Serial Data Clock
Serial Data Input
Serial Data Output
Ground
WP
WP
GND
GND
SO
8-lead MAP
VCC 8 1 CS
8-lead TSSOP
GND
VCC
WP
CS
SO
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
Power Supply
Write Protect
HOLD 7
SCK 6
SI 5
2 SO
3 WP
4 GND
WP
GND
HOLD
Suspends Serial Input
Bottom view
3348H–SEEPR–9/04