24LC41| Datasheet

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Obsolete Device

24LC41
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 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 Hardware write-protect for both ports 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 ensured 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

Package Type
PDIP DSCL VCLK/DWP VSS MSDA 1 2 3 4 24LC41 8 7 6 5 DSDA
VCC

MWP MSCL

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

MSCL

Description
The Microchip Technology Inc. 24LC41 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/DWP pin. A valid high-to-low transition on the DSCL pin will cause the device to enter the Bidirectional mode, with byte-selectable read/write capability of the memory array. 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 24LC41 is available
in a standard 8-pin PDIP package in both commercial and industrial temperature ranges.

MWP

I2C is a registered trademark of Philips Corporation.

2004 Microchip Technology Inc.

DS21140F-page 1