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24LC21 Datasheet(PDF) 1 Page - Microchip Technology |
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24LC21 Datasheet(HTML) 1 Page - Microchip Technology |
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1 / 16 page  2003 Microchip Technology Inc. DS21160F-page 1 24LC21A Features • Single supply with operation down to 2.5V • Completely implements DDC1™/DDC2™ interface for monitor identification, including recovery to DDC1 • Pin and function compatible with 24LC21 • Low-power CMOS technology - 1 mA typical active current -10 µA standby current typical at 5.5V • 2-wire serial interface bus, I2C™ compatible • 100 kHz (2.5V) and 400 kHz (5V) compatibility • Self-timed write cycle (including auto-erase) • Page write buffer for up to eight bytes • 1,000,000 erase/write cycles ensured • Data retention > 200 years • ESD Protection > 4000V • 8-pin PDIP and SOIC package • Available for extended temperature ranges Description The Microchip Technology Inc. 24LC21A is a 128 x 8-bit dual-mode Electrically Erasable PROM. This device is designed for use in applications requiring storage and serial transmission of configuration and control informa- tion. Two modes of operation have been implemented: Transmit-only mode and Bidirectional mode. 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 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 24LC21A is available in a standard 8-pin PDIP and SOIC package in both commercial and industrial temperature ranges. Package Types Block Diagram Pin Function Table - Commercial (C): 0°C to +70°C - Industrial (I): -40°C to +85°C Name Function VSS Ground SDA Serial Address/Data I/O SCL Serial Clock (Bidirectional mode) VCLK Serial Clock (Transmit-only mode) VCC +2.5V to 5.5V Power Supply NC No Connection PDIP SOIC NC NC NC VSS 1 2 3 4 8 7 6 5 Vcc VCLK SCL SDA NC NC NC Vss 1 2 3 4 8 7 6 5 Vcc VCLK SCL SDA I/O Control Logic HV Generator EEPROM Array Page Latches YDEC XDEC Sense AMP R/W Control Memory Control Logic SDA SCL VCC VSS VCLK 1K 2.5V Dual Mode I2C™ Serial EEPROM DDC is a trademark of the Video Electronics Standards Association. I2C is a trademark of Philips Corporation. |
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