DS1338-33 (3.3V) I2C RTC with 56-Byte NVRAM

The DS1338 serial real-time clock (RTC) is a lowpower, full binary-coded decimal (BCD)

clock/calendar plus 56 bytes of NV SRAM. Address

and data are transferred serially through an I2C

interface. The clock/calendar provides seconds,

minutes, hours, day, date, month, and year

information. The end of the month date is

automatically adjusted for months with fewer than 31

days, including corrections for leap year. The clock

operates in either the 24-hour or 12-hour format with

AM/PM indicator. The DS1338 has a built-in powersense circuit that detects power failures and

automatically switches to the backup supply,

maintaining time and date operation

 

Handhelds (GPS, POS Terminal)

Consumer Electronics (Set-Top Box, Digital

Recording, Network Appliance)

Office Equipment (Fax/Printer, Copier)

Medical (Glucometer, Medicine Dispenser)

Telecommunications (Router, Switcher, Server)

Other (Utility Meter, Vending Machine, Thermostat,modem)

 

• Completely Manages All Timekeeping Functions

o RTC Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Compensation Valid Up to 2100

o 56-Byte, Battery-Backed, General Purpose RAM with Unlimited Writes

o Programmable Square-Wave Output Signal

• Surface-Mount Package with an Integrated Crystal (DS1338C) Saves Additional Space and Simplifies Design

• Interfaces with Most Microcontrollers

o I2C Serial Interface

• Low-Power Operation Extends Battery Backup Run Time

o Automatic Power-Fail Detect and Switch Circuitry

• -40°C to +85°C Industrial Temperature Range Supports Operation in a Wide Range of Applications

• Underwriters Laboratories (UL®) Recognized