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Description:

The Microchip Technology Inc. 24LC21 is a 128 x 8 bit Electrically Erasable PROM. This device is designed for use in applications requiring storage and serial transmission of configuration and control information. 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 entire memory array contents, clocked by the VCLK pin. A valid high-to-low transition on the SCL pin will cause the device to enter the Bidirectional mode, with byte selectable read/write capability of the memory array. The 24LC21 is available in a standard 8-pin PDIP and SOIC package, in both commercial and industrial temperature ranges.

Features:

? Single supply with operation down to 2.5V

? Completely implements DDC1?/DDC2? interface for monitor identification

? Low-power CMOS technology:

- 1 mA active current typical

- 10 μA standby current typical at 5.5V

? 2-wire serial interface bus, I2C? compatible

? Self-timed write cycle (including auto-erase)

? Page-write buffer for up to 8 bytes

? 100 kHz (2.5V) and 400 kHz (5V) compatibility

? Factory programming (QTP) available

? 1,000,000 erase/write cycles ensured

? Data retention > 200 years

? 8-pin PDIP and SOIC package

? Available for extended temperature ranges

Commercial (C): 0°C to +70°C

Industrial (I): -40°C to +85°C