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24LC41A-/P Datasheet(PDF) 1 Page - Microchip Technology |
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24LC41A-/P Datasheet(HTML) 1 Page - Microchip Technology |
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1 / 18 page  2003 Microchip Technology Inc. DS21176D-page 1 24LC41A 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 µA standby current typical at 5.5V • Dual 2-wire serial interface bus, I2C™ 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 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 applica- tions 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 Transmit-only mode after it received 128 consecutive VCLK Package Type pulses while the DSCL pin is idle. The 4K-bit microcontroller port is completely indepen- dent of the DDC port, therefore, it can be accessed continuously by a microcontroller without interrupting DDC transmission activity. The 24LC41A is available in a standard 8-pin PDIP package in both commercial and industrial temperature ranges. Package Type Block Diagram Pin Function Table - Commercial (C): 0 °C to +70°C - Industrial (I): -40 °Cto +85 °C Name Function DSCL Serial Clock for DDC Bidirectional mode (DDC2) DSDA Serial Address and Data I/O(DDC Bus) VCLK Serial Clock for DDC Transmit-only mode (DDC1) MSCL Serial clock for 4K-bit MCU port MSDA Serial Address and Data I/O for 4K-bit MCU port MWP Hardware write-protect for Microcontroller Access Port VSS Ground VCC +2.5V to +5.5V power supply PDIP DSCL VCLK VSS MSDA 1 2 3 4 DSDA Vcc MWP MSCL 8 7 6 5 EDID Table 1K-Bit 4K-Bit Serial EEPROM MSDA MSCL DSDA VCLK DSCL 1K/4K 2.5V Dual Mode, Dual Port I2C™ Serial EEPROM DDC is a trademark of Video Electronics Standards Association. I2C is a trademark of Philips Corporation. |
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