AT34C02C_14 Datasheet, PDF (1/18 Pages) ATMEL Corporation – Hardware Write Protection for the Entire Array

Features
• Permanent and Reversible Software Write Protection for the First-half of the Array
– Software Procedure to Verify Write Protect Status
• Hardware Write Protection for the Entire Array
• Standard-voltage Operation
– 2.5 (V_CC = 2.5V to 5.5V)
• Internally Organized 256 x 8
• Two-wire Serial Interface
• Schmitt Trigger, Filtered Inputs for Noise Suppression
• Bidirectional Data Transfer Protocol
• 400 kHz (2.5V and 5.5V) Compatibility
• 16-byte Page Write Modes
• Partial Page Writes Are Allowed
• Self-timed Write Cycle (5 ms max)
• High-reliability
– Endurance: 1 Million Write Cycles
– Data Retention: 100 Years
• 8-lead JEDEC SOIC and 8-lead TSSOP Packages
Description
The AT34C02C 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 permanent and a reversible software write protection feature
while hardware write protection for the entire array is available via an external pin.
Once the permanent software write protection is enabled, by sending a special com-
mand to the device, it cannot be reversed. However, the reversible software write
protection is enabled and can be reversed by sending a special command. The hard-
ware 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 applica-
tion. The device is optimized for use in many industrial and commercial applications
where low-power and low-voltage operations are essential. The AT34C02C is avail-
able in space saving 8-lead JEDEC SOIC and 8-lead TSSOP packages and is
accessed via a Two-wire serial interface. It is available in 2.5V (2.5V to 5.5V).
Table 1. Pin Configurations
Pin Name Function
A0 - A2
Address Inputs
SDA
Serial Data
SCL
Serial Clock Input
WP
Write Protect
8-lead SOIC
A0 1
A1 2
A2 3
GND 4
8 VCC
7 WP
6 SCL
5 SDA
Two-wire
Automotive
Temperature
Serial EEPROM
with Permanent
and Reversible
Software Write
Protect
2K (256 x 8)
AT34C02C
A0
A1
A2
GND
8-lead TSSOP
1
8
2
7
3
6
4
5
VCC
WP
SCL
SDA
Rev. 5242B–SEEPR–01/09