24LCS22A| Datasheet

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24LCS22A
2K VESA E-EDIDTM Serial EEPROM
Features:
Single supply with operation down to 2.5V Supports Enhanced EDIDTM (E-EDIDTM) 1.3 Completely implements DDC1TM/DDC2TM interface for monitor identification, including recovery to DDC1 2 Kbit Serial EEPROM 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 Data retention > 200 years ESD protection > 4000V 8-pin DIP and SOIC packages Available temperature ranges: - Industrial (I) -40 C to +85 C

Package Types
PDIP/SOIC *NC *NC WP VSS 1 24LCS22A 2 3 4 8 7 6 5 VCC VCLK SCL SDA

* Pins labeled `NC' have no internal connection

Block Diagram
WP HV Generator

I/O Control Logic

Memory Control Logic

XDEC

EEPROM Array Page Latches

Description:
The Microchip Technology Inc. 24LCS22A is a 256 x 8-bit dual-mode Electrically Erasable PROM (EEPROM). 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 (1 Kbit) and Bidirectional mode (2 Kbit). 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 entire 2K 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 24LCS22A is available in standard 8-pin PDIP and
SOIC packages. The 24LCS22A features a flexible Write-Protect pin which is enabled by writing to address 7Fh (usually the checksum in VESA applications.
SDA SCL

YDEC VCLK Vcc Vss Sense Amp. R/W Control

2005 Microchip Technology Inc.

DS21682C-page 1