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Real-time clock (RTCs)
EM Microelectronic Marin

The V3020 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 V3020 has no busy states and there is no danger of a clock update while accessing. Supply current is typically 390nA at VDD = 3.0V. Battery operation is supported by complete functionality down to 1.2V. The oscillator stability is typically 0.3 ppm/V

Applications
Utility meters
Battery operated and portable equipment
Consumer electronics
White/brown goods
Pay phones
Cash registers
Personal computers
Programmable controller systems
Data loggers
Automotive systems
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