V3020
V3020 is Ultra Low Power 1-Bit 32-kHz RTC manufactured by EM Microelectronic.
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 390 n A at VDD = 3.0V. Battery operation is supported by plete functionality down to 1.2V. 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 Automotive systems
Features
Supply current typically 390 n A at 3V 50 ns access time with 50 p F load capacitance Fully operational from 1.2V to 5.5V No busy states or danger of a clock update while accessing Serial munication on one line of a standard parallel data bus or over a conventional 3 wire serial interface Interface patible 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°C to +85°C On request extended temperature range, -40°C to +125°C Pin patible with the V3021 TSSO8 and SO8 packages
Typical Operating Configuration
Pin Assignment or R/ or
Address Decoder
SO8 XI
XO CS
Data Bus Address Bus
CS XI
RD WR V3020
XO I/O
CS RAM RD WR
TSSO8 WR VDD XI XO
Copyright © 2005, EM Microelectronic-Marin SA
Fig. 1 1
VDD WR...
