Product folder

V3020 Ultra Low Power 1-Bit 32kHz RTC, 0.4uA standby current, up to +125°C.

Contents:   •  Datasheet   •  General description   •  Features   •  Applications

Datasheet DataSheet 710 Kb

General description

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.

Features

• Supply current typically 390nA at 3V • 50ns access time with 50pF load capacitance • Fully operational from 1.2V to 5.5V • No busy states or danger of a clock update while accessing • Serial communication on one line of a standard parallel data bus or over a conventional 3 wire serial interface • Interface compatible with both Intel and Motorola • Seconds, minutes, hours, day of month, month, year, week day and week number in BCD format • Leap year and week number correction • Time set lock mode to prevent unauthorized setting of the current time or date • Oscillator stability 0.3 ppm/volt • No external capacitor needed • Frequency measurement and test modes • Temperature range -40 to +85°C • On request extended temperature range, -40 to +125°C • Pin compatible with the V3021 • TSSO8 and SO8 packages

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