V3021SO8A EMMICRO [EM Microelectronic - MARIN SA], V3021SO8A Datasheet

V3021SO8A

Manufacturer Part Number

V3021SO8A

Description

Ultra Low Power 1-Bit 32 kHz RTC

Manufacturer

EMMICRO [EM Microelectronic - MARIN SA]

Datasheet

1.V3021SO8A.pdf (15 pages)

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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.

800 nA at V

complete functionality down to 2.0V.

typically 0.3 ppm/V.

Applications

Typical Operating Configuration

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

= 3.0V. Battery operation is supported by

EM MICROELECTRONIC -

Ultra Low Power 1-Bit 32 kHz RTC

CPU

Supply current is typically

I/O

Decoder

Address

V3021

RAM

The oscillator is

Fig. 1

Features

Pin Assignment

MARIN SA

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

SO8

V3021

www.emmicroelectronic.com

V3021

I/O

Fig. 2

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