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| V3021 Datasheet, PDF (1/15 Pages) EM Microelectronic - MARIN SA – Ultra Low Power 1-Bit 32 kHz RTC | |||
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EM MICROELECTRONIC - MARIN SA
V3021
Ultra Low Power 1-Bit 32 kHz RTC
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 nA at VDD = 3.0V. Battery operation is supported by
complete 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 computers
 Programmable controller systems
 Data loggers
 Automotive systems
Typical Operating Configuration
Features
 Supply current typically 800 nA at 3V
 50 ns access time with 50 pF load capacitance
 Fully operational from 2.0V 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°C to +85°C
 On request extended temperature range, -40°C to
+125°C
 Packages DIP8 and SO8
Pin Assignment
CPU
Address
Decoder
CS
RD
XI
WR V3021
XO
I/O
SO8
XI
XO
CS
VSS
V3021
VDD
WR
RD
I/O
Fig. 2
CS RAM
RD
WR
Copyright © 2005, EM Microelectronic-Marin SA
Fig. 1
1
www.emmicroelectronic.com
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