V3020 Datasheet, PDF(1/14 Page) List of Unclassifed Manufacturers

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V3020 Datasheet, PDF (1/14 Pages) List of Unclassifed Manufacturers – Ultra Low Power 1-Bit 32 kHz RTC

EM MICROELECTRONIC-MARIN SA

Ultra Low Power 1-Bit 32 kHz RTC

V3020

Features

n Supply current typically 390 nA at 3 V

n 50 ns access time with 50 pF load capacitance

n Fully operational from 1.2 V to 5.5 V

n No busy states or danger of a clock update while

accessing

n Serial communication on one line of a standard parallel

data bus or over a conventional 3 wire serial interface

n Interface compatible with both Intel and Motorola

n Seconds, minutes, hours, day of month, month, year, week

day and week number in BCD format

n Leap year and week number correction

n Time set lock mode to prevent unauthorized setting of the

current time or date

n Oscillator stability 0.3 ppm / volt

n No external capacitor needed

n Frequency measurement and test modes

n Temperature range -40 to +85 oC

n On request extended temperature range, -40 to +125 oC

n Pin compatible with the V3021

n TSSO8 and SO8 packages

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

nA at VDD = 3.0 V. Battery operati on is supported by complete

functionality down to 1.2 V. The oscillator s tability is typically 0.3

ppm/V.

Applications

n Utility meters

n Battery operated and portable equipment

n Consumer electronics

n White/brown goods

n Pay phones

n Cash registers

n Personal computers

n Programmable controller systems

n Data loggers

n Automotive systems

Typical Operating Configuration

CPU

Address

Decoder

V3020

I/O

RAM

Pin Assignment

S08

V3020

VSS

Fig. 1

VDD

I/O

TSSO8 WR

VDD

V3020

I/O

VSS

Fig. 2

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