AT34C02_07 View Datasheet(PDF) - Atmel Corporation

Part Name

Description

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AT34C02_07

Two-wire Serial EEPROM with Permanent Software Write Protect

Atmel Corporation 

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 (VCC = 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

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