24LCS21A| Datasheet

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24LCS21A
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, Including Recovery to DDC1 Low-Power CMOS Technology: - 1 mA active current, typical - 10 A standby current, typical at 5.5V 2-Wire Serial Interface Bus, I2CTM Compatible 100 kHz (2.5V) and 400 kHz (5V) Compatibility Self-Timed Write Cycle (including Auto-Erase) Hardware Write-Protect Pin Page Write Buffer for up to Eight Bytes 1,000,000 Erase/Write Cycles Ensured Data Retention > 200 years ESD Protection > 4000V 8-pin PDIP and SOIC Package Available for Extended Temperature Ranges: - Industrial (I): -40 C to +70 C Pb-Free and RoHS Compliant

Package Types
PDIP NC NC WP Vss SOIC NC NC WP Vss 1 2 3 4 24LCS21A 8 7 6 5 Vcc VCLK SCL SDA 1 24LCS21A 2 3 4 8 7 6 5 Vcc VCLK SCL SDA

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

Description:
The Microchip Technology Inc. 24LCS21A 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 memory array from 00h to 7Fh, clocked by the VCLK pin. A valid high-to-low transition on the SCL pin will cause the device to enter the Transition mode and look for a valid control byte on the I2C bus. If it detects a valid control byte from the master, it will switch into Bidirectional mode, with byte selectable read/write capability of the memory array using SCL. If no control byte is received, the device will revert to the Transmit-Only mode after it receives 128 consecutive VCLK pulses while the SCL pin is idle. The 24LCS21A also enables the user to write-protect the entire memory array using its writ
e-protect pin. The 24LCS21A is available in a standard 8-pin PDIP and SOIC package in industrial temperature range.
DDC is a trademark of the Video Electronics Standards Assoc. I2C is a trademark of Philips Corporation.

XDEC

EEPROM Array Page Latches

SDA

SCL YDEC

VCLK VCC VSS Sense AMP R/W Control

Pin Function Table
Name WP VSS SDA SCL VCLK VCC NC Function Write-Protect (active low) Ground Serial Address/Data I/O Serial Clock (Bidirectional mode) Serial Clock (Transmit-Only mode) +2.5V to 5.5V Power Supply No Connection

2007 Microchip Technology Inc.

DS21161H-page 1