AT25640
SPI Serial EEPROMs

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The AT25080/160/320/640 provides 8192/16384/32768/65536 bits of serial electri-cally 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 operationare essential. The AT25080/160/320/640 is available in space saving 8-pin PDIP, JEDEC SOIC, and 14-pin and
20-pin TSSOP packages.
The AT25080/160/320/640 is enabled through the Chip Select pin (CS) and accessed via a 3-wire interface con-sisting of Serial Data Input (SI), Serial Data Output (SO),and Serial Clock (SCK). All programming cycles are com-pletely 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.

Operating Temperature.................................. -55℃ to +125℃
Storage Temperature..................................... -65℃ to +150℃
Voltage on Any Pin
with Respect to Ground.....................................    -1.0V to +7.0V
Maximum Operating Voltage...........................................    6.25V
DC Output Current.............................................................5.0 mA
*NOTICE: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent dam-age to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
 

* 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)
   – 1.8 (VCC= 1.8V to 3.6V)
* 2.1 MHz Clock Rate
* 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 Typical)
* High Reliability
  
– Endurance: 1 Million Write Cycles 
   – Data Retention: 100 Years
   – ESD Protection: >4000V
* Automotive Grade and Extended Temperature Devices Available
* 8-Pin PDIP, JEDEC SOIC, and 14-Pin and 20-Pin TSSOP Packages

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Datasheet

Size: 331.56KB
Page: 21
PDF: AT25640.pdf
  • Description:
    SPI Serial EEPROMs
  • MFG:
    ATMEL [ATMEL Corporation]
 

Abstract


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)
3.0 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 Typical)
High-reliability
– Endurance: One Million Write Cycles
– Data Retention: 100 Years
Automotive Grade Devices Available
8-lead PDIP, 8-lead JEDEC SOIC and 14-lead TSSOP Packages
Description
The AT25080/160/320/640 provides 8192/16384/32768/65536 bits of serial electri-
cally-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 AT25080/160/320/640 is available in space saving 8-lead PDIP, 8-
lead JEDEC SOIC and 14-lead TSSOP packages.
The AT25080/160/320/640 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.
SPI Serial
EEPROMs
8K (1024 x 8)
16K (2048 x 8)
32K (4096 x 8)
64K (8192 x 8)
AT25080
AT25160
AT25320
AT25640
0675M–SEEPR–9/03
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
8-lead 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
14-lead TSSOP
1
2
3
4
5
6
7
14
13
12
11
10
9
8
CS
SO
NC
NC
NC
WP
GND
VCC
HOLD
NC
NC
NC
SCK
SI

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