24C21 データシートの表示（PDF） - Atmel Corporation

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24C21

2-Wire Serial EEPROM 1K (128 x 8)

Atmel Corporation 

Features

• 2-Wire Serial Interface

• Schmitt Trigger, Filtered Inputs For Noise Suppression

• DDC1™/ DDC2™ Interface Compliant for Monitor Identification

• Low Voltage Operation

– 2.5 (VCC = 2.5V to 5.5V)

• Internally Organized 128 x 8

• 100 kHz (2.5V) Compatibility

• 8-Byte Page Write Mode

• Write Protection Available

• Self-timed Write Cycle (10 ms max)

• High Reliability

– Endurance: 1 Million Write Cycles

– Data Retention: 100 Years

– ESD Protection: >3000V

• 8-Pin PDIP and JEDEC SOIC Packages

Description

The AT24C21 provides 1024 bits of serial electrically erasable and programmable

read only memory (EEPROM) organized as 128 words of 8 bits each. The device is

optimized for use in applications requiring data storage and serial transmission of con-

figuration and control information. The AT24C21 features two modes of operation:

Transmit-Only Mode and Bidirectional Mode. Upon power-up, the AT24C21 will be in

the Transmit-Only Mode, sending a serial-bit stream of the entire memory contents,

clocked via the VCLK pin. The Bidirectional Mode is selected by a valid high-to-low

transition on the SCL pin and offers byte selectable read/write capability of the entire

memory array. The AT24C21 is available in space saving 8-pin PDIP and 8-pin SOIC

packages.

Pin Configurations

Pin Name

NC

SDA

SCL

VCLK

Function

No Connect

Serial Data

Serial Clock Input

(Bidirectional Mode)

Serial Clock Input

(Transmit-Only Mode)

2-Wire Serial

EEPROM

1K (128 x 8)

AT24C21

2-Wire, 1K

Serial EEPROM

8-Pin PDIP

8-Pin SOIC

Rev. 0405E–07/98

1

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