DESCRIPTION

The CAT24C21 is a 1-kb Serial CMOS EEPROM internally organized as 128 words of 8 bits each. The device complies with the Video Electronics Standard Associations (VESA?), Display Data Channel (DDC?) standards for Plug-and-Play monitors. The transmitonly mode (DDC1?) is controlled by the VCLK clock input and the bi-directional mode (DDC2?) is controlled by the SCL clock input, with both modes sharing a common SDA input/output (I/O). The transmit-only mode is a read-only mode, while the bi-directional mode is a read and write mode following the I2C protocol. In write mode the CAT24C21 features a 16-byte page write buffer. The device is available in 8-in DIP, SOIC, TSSOP, MSOP and TDFN packages.

FEATURES

■ DDC1TM/DDC2TM interface compliant for monitor identification

■ 400 kHz I2C bus compatible*

■ 2.5 to 5.5 volt operation

■ 16-byte page write buffer

■ Hardware write protect

■ Low power CMOS technology

■ 1,000,000 program/erase cycles

■ 100 year data retention

■ 8-pin DIP, SOIC, TSSOP, MSOP or TDFN packages

■ Industrial temperature range