24LCS21| Datasheet

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Not recommended for new designs Please use 24LCS21A.

24LCS21
1K 2.5V Dual Mode I2CTM Serial EEPROM
Features:
Completely implements DDC1 /DDC2 interface for monitor identification Hardware write-protect pin Single supply with operation down to 2.5V Low-power CMOS technology: - 1 mA active current, typical - 10 A standby current, typical at 5.5V 2-wire serial interface bus, I2CTM compatible (SCL) Self-timed write cycle (including auto-erase) Page-write buffer for up to 8 bytes 100 kHz (2.5V) and 400 kHz (5V) compatibility (SCL) 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
TM TM

Package Types
PDIP

NC NC WP VSS SOIC NC NC WP VSS

1 24LCS21 2 3 4

8 7 6 5

VCC VCLK SCL SDA

1 2 3 4 24LCS21

8 7 6 5

VCC VCLK SCL SDA

Description:
The Microchip Technology Inc. 24LCS21 is a 128 x 8-bit dual-mode 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 in standard I2C protocol. The 24LCS21 also enables the user to write-protect the entire memory contents using its write-protect pin. The 24LCS21 is available in a standard 8-pin PDIP and SOIC package in both commercial and industrial temperature ranges.

Block Diagram
WP HV Generator

I/O Control Logic

Memory Control Logic

EEPROM XDEC

Array
Page Latches

SDA SCL YDEC VCLK VCC VSS

Sense Amp R/W Control

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

2005 Microchip Technology Inc.

DS21127F-page 1

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24LCS21 DATASHEET