24LC41 Datasheet, PDF (1/12 Pages) Microchip Technology – 1K/4K 2.5V Dual Mode, Dual Port I 2 C Serial EEPROM

24LC41
1K/4K 2.5V Dual Mode, Dual Port I²C^™ 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 µA 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 guaranteed
• 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
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 applica-
tions requiring storage and serial transmission of con-
figuration and control information. Three modes of
operation have been implemented:
• Transmit-Only Mode for the DDC Monitor Port
• Bi-directional Mode for the DDC Monitor Port
• Bi-directional, 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 bi-direc-
tional 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.
PACKAGE TYPE
PDIP
DSCL 1
VCLK/DWP 2
VSS 3
MSDA 4
8 DSDA
7 VCC
6 MWP
5 MSCL
BLOCK DIAGRAM
EDID Table
1K Bit
MSDA
MSCL
4K Bit
Serial
EEPROM
DSDA
VCLK/DWP
DSCL
MWP
DDC is a trademark of the Video Electronics Standards Association.
I²C is a trademark of Philips Corporation.
© 1996 Microchip Technology Inc.
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