CAT24C21 Datasheet | Catalyst Semiconductor

1-kb Dual Mode Serial EEPROM for VESA™ "Plug-and-Play" Features s DDC1TM/DDC2TM interface pliant for s Low power CMOS technology s 1,000,000 program/erase cycles s 100 year data retention GEN FR ALO A D F R E ETM monitor identification s 400 k Hz I2C bus patible- s 2.5 to 5.5 volt operation s 16-byte page write buffer s Hardware write protect s 8-pin DIP, SOIC, TSSOP, MSOP or TDFN packages s Industrial temperature range DESCRIPTION The CAT24C21 is a 1-kb Serial CMOS EEPROM internally organized as 128 words of 8 bits each. The device plies with the Video Electronics Standard Association's (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 mon 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. PIN CONFIGURATION DIP Package (P, L) NC NC NC VSS 1 2 3 4 8 7 6 5 VCC VCLK SCL SDA FUNCTIONAL SYMBOL SOIC Package (J, W) NC NC NC VSS 1 2 3 4 8 7 6 5 VCC VCLK SCL SDA MSOP Package (R, Z) NC NC NC VSS 1 2 3 4 8 7 6 5 VCC VCLK SCL SDA TDFN Package (RD4, ZD4) VCLK NC 1 NC 2 NC 3 VSS 4 8 VCC 7 VCLK 6 SCL 5 SDA 3 mm x 3 mm Top View PIN FUNCTIONS Pin Name NC SDA SCL VCLK VCC Function No Connect Serial Data/Address Serial Clock (bi-directional mode) Serial Clock (transmit-only mode) Power Supply Ground TSSOP Package (U, Y) NC NC NC VSS 1 2 3 4 8 7 6 5 VCC VCLK SCL SDA - Catalyst Semiconductor is licensed by Philips Corporation to carry the I2C Bus Protocol. © 2004 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice Doc. No. 1032, Rev....