24LC21| Datasheet

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Not recommended for new designs Please use 24LCS21A.

24LC21
1K 2.5V Dual Mode I2CTM Serial EEPROM
Features:
Single supply with operation down to 2.5V Completely implements DDC1TM/DDC2TM interface for monitor identification Low-power CMOS technology: - 1 mA active current typical - 10 uA standby current typical at 5.5V 2-wire serial interface bus, I2CTM compatible Self-timed write cycle (including auto-erase) Page-write buffer for up to 8 bytes 100 kHz (2.5V) and 400 kHz (5V) compatibility Factory programming (QTP) available 1,000,000 erase/write cycles ensured Data retention > 200 years 8-pin PDIP and SOIC package Available for extended temperature ranges Commercial (C): 0 C to +70 C Industrial (I): -40 C to +85 C

Package Types
PDIP NC NC NC VSS 1 2 3 4 24LC21 8 7 6 5 VCC VCLK SCL SDA

SOIC 1 2 3 4 24LC21 8 7 5 5

NC NC NC VSS

VCC VCLK SCL SDA

Description:
The Microchip Technology Inc. 24LC21 is a 128 x 8 bit Electrically Erasable PROM. This device is designed for use in applications requiring storage and serial transmission of configuration and control information. Two modes of operation have been implemented: Transmit-only mode and Bidirectional mode. Upon power-up, the device will be in the Transmit-only mode, sending a serial bit stream of the entire memory array contents, clocked by the VCLK pin. A valid high-to-low transition on the SCL pin will cause the device to enter the Bidirectional mode, with byte selectable read/write capability of the memory array. The 24LC21 is available in a standard 8-pin PDIP and SOIC package, in both commercial and industrial temperature ranges.

Block Diagram
VCLK HV Generator I/O Control Logic Memory Control Logic

XDEC

EEPROM Array Page Latches

SDA SCL
YDEC VCC VSS Sense Amp R/W Control

I2C is a trademark of Philips Corporation. DDC is a trademark of the Video Electronics Standards Association.

2004 Microchip Technology Inc.

DS21095J-page 1

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24LC21 DATASHEET