24C21 Datasheet | Atmel

Features - - - - - - - - - - 2-Wire Serial Interface Schmitt Trigger, Filtered Inputs For Noise Suppression DDC1™/ DDC2™ Interface pliant for Monitor Identification Low Voltage Operation - 2.5 (VCC = 2.5V to 5.5V) Internally Organized 128 x 8 100 k Hz (2.5V) patibility 8-Byte Page Write Mode Write Protection Available Self-timed Write Cycle (10 ms max) High Reliability - Endurance: 1 Million Write Cycles - Data Retention: 100 Years - ESD Protection: >3000V 8-Pin PDIP and JEDEC SOIC Packages 2-Wire Serial EEPROM 1K (128 x 8) - Description The AT24C21 provides 1024 bits of serial electrically erasable and programmable read only memory (EEPROM) organized as 128 words of 8 bits each. The device is optimized for use in applications requiring data storage and serial transmission of configuration and control information. The AT24C21 features two modes of operation: Transmit-Only Mode and Bidirectional Mode. Upon power-up, the AT24C21 will be in the Transmit-Only Mode, sending a serial-bit stream of the entire memory contents, clocked via the VCLK pin. The Bidirectional Mode is selected by a valid high-to-low transition on the SCL pin and offers byte selectable read/write capability of the entire memory array. The AT24C21 is available in space saving 8-pin PDIP and 8-pin SOIC packages. AT24C21 Pin Configurations Pin Name NC SDA SCL VCLK Function No Connect Serial Data Serial Clock Input (Bidirectional Mode) Serial Clock Input (Transmit-Only Mode) 8-Pin PDIP 8-Pin SOIC 2-Wire, 1K Serial EEPROM Rev. 0405E- 07/98 Absolute Maximum Ratings- Operating Temperature -55°C to +125°C Storage Temperature -65°C to +150°C Voltage on Any Pin with Respect to Ground -1.0V to +7.0V Maximum Operating Voltage 6.25V DC Output Current 5.0 m A - NOTICE: Stresses beyond those listed...