AT34C02_14 Datasheet, PDF (1/21 Pages) ATMEL Corporation – Permanent Software Write Protection for the First-half of the Array

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 Operation
– 1.8 (V_CC = 1.8V to 5.5V)
• Internally Organized 256 x 8
• Two-wire Serial Interface
• Schmitt Trigger, Filtered Inputs for Noise Suppression
• Bidirectional Data Transfer Protocol
• 100 kHz (1.8V) and 400 kHz (2.7V and 5.0V) 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
• Automotive Grade Devices Available
• 8-lead PDIP, 8-lead JEDEC SOIC, 8-lead MAP, 8-lead TSSOP, and 8-ball dBGA2
Packages
• Die Sales: Wafer Form, Waffle Pack, and Bumped Wafers
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-lead PDIP, 8-lead JEDEC SOIC, 8-lead MAP, 8-lead
TSSOP and 8-ball dBGA2 packages and is accessed via a two-wire serial interface. In
addition, it is available in 1.8V (1.8V to 5.5V) versions.
Table 1. Pin Configurations
Pin Name Function
8-lead PDIP
8-lead MAP
A0 - A2
SDA
SCL
Address Inputs
Serial Data
Serial Clock Input
A0 1
A1 2
A2 3
GND 4
8 VCC
7 WP
6 SCL
5 SDA
VCC 8
WP 7
SCL 6
SDA 5
1 A0
2 A1
3 A2
4 GND
WP
Write Protect
Bottom View
8-lead TSSOP
A0 1
A1 2
A2 3
GND 4
8 VCC
7 WP
6 SCL
5 SDA
8-lead SOIC
A0 1
A1 2
A2 3
GND 4
8 VCC
7 WP
6 SCL
5 SDA
8-ball dBGA2
VCC 8
WP 7
SCL 6
SDA 5
1 A0
2 A1
3 A2
4 GND
Bottom View
Two-wire Serial
EEPROM
with Permanent
Software Write
Protect
2K (256 x 8)
AT34C02
Note: Not recommended for new
design; please refer to
AT34CO2C datasheet.
Rev. 0958Q–SEEPR–1/07
1