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AT25640A Datasheet

  • AT25640A

  • ATMEL Corporation [SPI Serial EEPROMs]

  • ATMEL   ATMEL

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Features
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Serial Peripheral Interface (SPI) Compatible
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Supports SPI Modes 0 (0,0) and 3 (1,1)
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鈥?Data Sheet Describes Mode 0 Operation
Medium-voltage and Standard-voltage Operation
鈥?2.7 (V
CC
= 2.7V to 5.5V)
Extended Temperature Range 鈥?0擄C to 125擄C
5.0 MHz Clock Rate
32-byte Page Mode
Block Write Protection
鈥?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 (2 ms [5V] typical)
High Reliability
鈥?Endurance: One Million Write Cycles
鈥?Data Retention: 100 Years
8-lead PDIP, 8-lead JEDEC SOIC Packages 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
automotive 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 and 8-lead TSSOP packages.
The AT25080A/160A/320A/640A 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 to the status register. The
HOLD pin may be used to suspend any serial communication without resetting the
serial sequence.
Table 1.
Pin Configurations
Pin Name
CS
SCK
SI
SO
GND
VCC
WP
HOLD
NC
DC
Function
Chip Select
Serial Data Clock
Serial Data Input
Serial Data Output
Ground
Power Supply
Write Protect
Suspends Serial Input
No Connect
Don鈥檛 Connect
CS
SO
WP
GND
CS
SO
WP
GND
SPI Serial
Extended
Temperature
EEPROMs
8K (1024 x 8)
16K (2048 x 8)
32K (4096 x 8)
64K (8192 x 8)
AT25080A
AT25160A
AT25320A
AT25640A
8-lead
PDIP
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
8-lead
TSSOP
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
5082B鈥揝EEPR鈥?/05
1

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