Features: *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 C...
ST24FC21: Features: *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*...
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Specifications Symbol Parameter Value Unit TA Ambient Operating Temperature 40 to 125...
Specifications Symbol Parameter Value Unit TA Ambient Operating Temperature 40 to 125...

| Symbol | Parameter | Value | Unit |
| TA | Ambient Operating Temperature | 40 to 85 | |
| TSTG | Storage Temperature | 65 to 150 | |
| TLEAD | Lead Temperature, Soldering (SO8 package)40 sec (PSDIP8 package)10 sec |
215 260 |
|
| VIO | Input or Output Voltages | 0.3 to 6.5 | V |
| VCC | Supply Voltage | 0.3 to 6.5 | V |
| VESD | Electrostatic Discharge Voltage (Human Body model)(2) | 4000 | V |
| Electrostatic Discharge Voltage (Machine model)(3) | 500 | V |
The ST24LC21B, ST24LW21, ST24FC21,ST24FC21B and ST24FW21 are 1K bit electrically erasable programmable memory (EEPROM), organized 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.