1338-18DVGI8 datasheet(1/23 Pages) IDT

Part #	1338-18DVGI8

Description	REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM

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Manufacturer	IDT [Integrated Device Technology]

Direct Link	http://www.idt.com

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DATASHEET

REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM

IDT1338

IDT®

REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM 1

IDT1338

REV K 032910

General Description

The IDT1338 is a serial real-time clock (RTC) device that

consumes ultra-low power and provides a full binary-coded

decimal (BCD) clock/calendar with 56 bytes of battery

backed Non-Volatile Static RAM. The clock/calendar

provides seconds, minutes, hours, day, date, month, and

year information. The clock operates in either the 24-hour

or 12-hour format with AM/PM indicator. The end of the

month date is automatically adjusted for months with fewer

than 31 days, including corrections for leap year. Access to

the clock/calendar registers is provided by an I2C interface

capable of operating in fast I2C mode. Built-in Power-sense

circuitry detects power failures and automatically switches

to the backup supply, maintaining time and date operation.

Applications

• Telecom (Routers, Switches, Servers)

• Handheld (GPS, Point of Sale POS terminals)

• Consumer Electronics (Set-Top Box, Digital Recording,

Network Applications, Digital photo frames)

• Office (Fax/Printers, Copiers)

• Medical (Glucometer, Medicine Dispensers)

• Others (Thermostats, Vending Machines, Modems, Utility

Meters)

Features

• Real-Time Clock (RTC) counts seconds, minutes, hours,

day, date, month, and year with leap-year compensation

valid up to 2100

• 56-Byte battery-backed Non Volatile RAM for data

storage

• Fast mode I2C Serial interface

• Automatic power-fail detect and switch circuitry

• Programmable square-wave output

• Packaged in 8-pin MSOP, 8-pin SOIC, or 16-pin SOIC

(surface-mount package with an integrated crystal)

• Industrial temperature range (-40°C to +85°C)

Block Diagram

VCC

GND

VBAT

SCL

SDA

Crystal inside package

for 16-pin SOIC ONLY

X1

X2

1 Hz/4.096 kHz/

8.192 kHz/32.768 kHz

SQW/OUT

Power

Control

I

2C

Interface

32.768 kHz

Oscillator and

Divider

Control

Logic

MUX/

Buffer

Clock, Calendar

Counter

56 Byte

RAM

1 Byte

Control

7 Bytes

Buffer

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Manufacturer	Part #	Datasheet	Description
Integrated Device Techn...	1338-18DVGI8	436Kb / 23P	REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM

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