Rainbow Electronics AT25040A User Manual
Spi serial automotive eeproms, Prom, Features
1
Features
•
Serial Peripheral Interface (SPI) Compatible
•
Supports SPI Modes 0 (0,0) and 3 (1,1)
•
Medium-voltage and Standard-voltage Operation
– 5.0 (V
CC
= 4.5V to 5.5V)
– 2.7 (V
CC
= 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
•
8-pin PDIP and 8-lead JEDEC SOIC Package
Description
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 automotive applications where
low-power and low voltage operation are essential. The AT25010A/020A/040A is avail-
able in space saving 8-pin PDIP and 8-lead JEDEC SOIC packages.
The AT25010A/020A/040A 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 sepa-
rate 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 instruc-
tions 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 Serial
Automotive
EEPROMs
1K (128 x 8)
2K (256 x 8)
4K (512 x 8)
AT25010A
AT25020A
AT25040A
Preliminary
SPI, 1K Serial
E
2
PROM
Pin Configurations
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
8-pin PDIP
1
2
3
4
8
7
6
5
CS
SO
WP
GND
VCC
HOLD
SCK
SI
8-lead SOIC
1
2
3
4
8
7
6
5
CS
SO
WP
GND
VCC
HOLD
SCK
SI
Rev. 3402A–SEEPR–10/3/03