24LC41A| Datasheet

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24LC41A
1K/4K 2.5V Dual Mode, Dual Port I2CTM Serial EEPROM
Features
Single supply with operation down to 2.5V Completely implements DDC1/DDC2 interface for monitor identification, including recovery to DDC1 Improved noise immunity Separate high speed 2-wire bus for microcontroller access to 4K-bit Serial EEPROM Low-power CMOS technology 2 mA active current typical 20 uA standby current typical at 5.5V Dual 2-wire serial interface bus, I2CTM compatible Hardware write-protect for Microcontroller Access Port Self-timed write cycle (including auto-erase) Page write buffer for up to 8 bytes (DDC port) or 16 bytes (4K Port) 100 kHz (2.5V) and 400 kHz (5V) compatibility 1,000,000 erase/write cycles Data retention > 40 years 8-pin PDIP package Available for extended temperature ranges - Commercial (C): 0 C to +70 C - Industrial (I): -40 C to +85 C The 4K-bit microcontroller port is completely independent of the DDC port, therefore, it can be accessed continuously by a microcontroller without interrupting DDC transmission activity. The 24LC41A is avail
able in a standard 8-pin PDIP package in both commercial and industrial temperature ranges.

Package Type
PDIP
DSCL VCLK VSS MSDA 1 8 DSDA Vcc MWP MSCL

24LC41A

2 3 4

7 6 5

Block Diagram
DDC Monitor Port DSDA EDID Table 1K-Bit VCLK DSCL Microcontroller Access Port MSDA 4K-Bit Serial EEPROM

Description
The Microchip Technology Inc. 24LC41A is a dual port 128 x 8 and 512 x 8-bit Electrically Erasable PROM (EEPROM). This device is designed for use in applications requiring storage and serial transmission of configuration and control information. Three modes of operation have been implemented: Transmit-only mode for the DDC Monitor Port Bidirectional mode for the DDC Monitor Port Bidirectional, industry-standard 2-wire bus for the 4K Microcontroller Access Port Upon power-up, the DDC Monitor Port will be in the Transmit-only mode, repeatedly sending a serial bit stream of the entire memory array contents, clocked by the VCLK pin. A valid high-to-low transition on the DSCL pin will cause the device to enter the transition mode, an look for a valid control byte on the I2C bus. If it detects a valid control byte from the master, it will switch to Bidirectional mode, with byte selectable read/ write capability of the memory array using DSCL. If no control byte is received, the device will revert to the Tran
smit-only mode after it received 128 consecutive VCLK Package Type pulses while the DSCL pin is idle.

MSCL

Pin Function Table
Name DSCL DSDA VCLK MSCL MSDA MWP VSS VCC Function Serial Clock for DDC Bidirectional mode (DDC2) Serial Address and Data I/O(DDC Bus) Serial Clock for DDC Transmit-only mode (DDC1) Serial clock for 4K-bit MCU port Serial Address and Data I/O for 4K-bit MCU port Hardware write-protect for Microcontroller Access Port Ground +2.5V to +5.5V power supply

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

2003 Microchip Technology Inc.

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