V3021
Description
The V3021 is a low power CMOS real time clock. Data is transmitted serially as 4 address bits and 8 data bits, over one line of a standard parallel data bus. The device is accessed by chip select ( CS ) with read and write control timing provided by either RD and WR pulse (Intel CPU) or DS with advanced R/ W (Motorola CPU). Data can also be transmitted over a conventional 3 wire serial interface having CLK, data I/O and strobe. The V3021 has no busy states and there is no danger of a clock update while accessing. Supply current is typically 800 n A at VDD = 3.0V. Battery operation is supported by plete functionality down to 2.0V. The oscillator is typically 0.3 ppm/V.
Applications Utility meters Battery operated and portable equipment Consumer electronics White/brown goods Pay phones Cash registers Personal puters Programmable controller systems Data loggers
Typical Operating Configuration
Features
Supply current typically 800 n A at 3V 50 ns access...
