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AT34C02 Datasheet(PDF) 1 Page - ATMEL Corporation

Part No. AT34C02
Description  2-Wire Serial EEPROM with Permanent Software Write Protect
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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1
Features
Permanent Software Write Protection for the First-Half of the Array
– Software Procedure to Verify Write Protect Status
Hardware Write Protection for the Entire Array
Low Voltage and Standard Voltage Operation
– 5.0 (V
CC = 4.5V to 5.5V)
– 2.7 (V
CC = 2.7V to 5.5V)
– 1.8 (V
CC = 1.8V to 5.5V)
Internally Organized 256 x 8
2-Wire Serial Interface
Schmitt Trigger, Filtered Inputs for Noise Suppression
Bidirectional Data Transfer Protocol
100 KHz (1.8V and 2.7V) and 400 KHz (5.0V) Compatibility
16-Byte Page Write Modes
Partial Page Writes Are Allowed
Self-Timed Write Cycle (10 ms max)
High Reliability
– Endurance: 1 Million Write Cycles
– Data Retention: 100 Years
– ESD Protection: >3,000V
Automotive Grade and Extended Temperature Devices Available
8-Pin PDIP, 8-Pin JEDEC SOIC and 8-Pin TSSOP Packages
Description
The AT34C02 provides 2048 bits of serial electrically erasable and programmable
read only memory (EEPROM) organized as 256 words of 8 bits each. The first-half of
the device incorporates a software write protection feature while hardware write pro-
tection for the entire array is available via an external pin as well. Once the software
write protection is enabled, by sending a special command to the device, it cannot be
reversed. The hardware write protection is controlled with the WP pin and can be used
to protect the entire array, whether or not the software write protection has been
enabled. This allows the user to protect none, first-half, or all of the array depending
on the application. The device is optimized for use in many industrial and commercial
applications where low power and low voltage operations are essential. The AT34C02
is available in space saving 8-pin PDIP, 8-pin JEDEC SOIC, and 8-pin TSSOP pack-
ages and is accessed via a 2-wire serial interface. In addition, it is available in 5.0V
(4.5V to 5.5V), 2.7V (2.7V to 5.5V), and 1.8V (1.8V to 5.5V) versions.
Rev. 0958D–07/98
Pin Configurations
Pin Name
Function
A0 to A2
Address Inputs
SDA
Serial Data
SCL
Serial Clock Input
WP
Write Protect
2-Wire Serial
EEPROM
with Permanent
Software Write
Protect
2K (256 x 8)
AT34C02
8-Pin PDIP
1
2
3
4
8
7
6
5
A0
A1
A2
GND
VCC
WP
SCL
SDA
8-Pin SOIC
1
2
3
4
8
7
6
5
A0
A1
A2
GND
VCC
WP
SCL
SDA
8-Pin TSSOP
1
2
3
4
8
7
6
5
A0
A1
A2
GND
VCC
WP
SCL
SDA
2-Wire Serial
EEPROM with
Permanent
Software Write
Protec




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