V3021 Datasheet | EM Microelectronic

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 time with 50 p F load capacitance  Fully operational from 2.0V 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  Package SO8 Pin Assignment SO8 I/O Fig. 2 Fig. 1 Copyright 2022, EM Microelectronic-Marin SA 3021-DS, Version 3.0, 10-Nov-22 .emmicroelectronic. DATASHEET Ɩ EM3021 Absolute Maximum Ratings Parameter Maximum voltage at VDD Minimun voltage at VDD Maximum voltage at any signal pin Minimum voltage at any...