DESCRIPTION
The ST24LC21B, ST24LW21, ST24FC21, ST24FC21B and ST24FW21 are 1K bit electrically erasable programmable memory (EEPROM), or ganized in 128x8 bits. In the text, products are referred as ST24xy21, where "x" is either "L" for VESA 1 or "F" for VESA 2 compatible memories and where "y" indicates the Write Control pin connection: "C" means WC on pin 7 and "W" means WC on pin 3.

• 1 MILLION ERASE/WRITE CYCLES
• 40 YEARS DATA RETENTION
• 3.6V to 5.5V or 2.5V to 5.5V SINGLE SUPPLY VOLTAGE
• HARDWARE WRITE CONTROL (ST24LW21 and ST24FW21)
• TTL SCHMITT-TRIGGER on VCLK INPUT
• 100k / 400k Hz COMPATIBILITY with the I2C BUS BIT TRANSFER RANGE
• TWO WIRE SERIAL INTERFACE I2C BUS COMPATIBLE
• I2C PAGE WRITE (up to 8 Bytes)
• I2C BYTE, RANDOM and SEQUENTIAL READ MODES
• SELF TIMED PROGRAMMING CYCLE
• AUTOMATIC ADDRESS INCREMENTING
• ENHANCED ESD/LATCH UP PERFORMANCES
• ERROR RECOVERY MECHANISM (ST24FC21 and ST24FW21) VESA 2 COMPATIBLE