DS1337, DS1337C

I²C Serial Real-Time Clock

Industry's Smallest I²C RTC with Two Time-of-Day Alarms


Description

The DS1337 serial real-time clock is a low-power clock/calendar with two programmable time-of-day alarms and a programmable square-wave output. Address and data are transferred serially through an I²C bus. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The date at the end of the month 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 device is fully accessible through the serial interface while VCC is between 1.8V and 5.5V. I²C operation is not guaranteed below 1.8V. Timekeeping operation is maintained with VCC as low as 1.3V.

DS1337, DS1337C: Typical Operating Circuit DS1337, DS1337C: Typical Operating Circuit Enlarge+

Key Features

  • Completely Manages All Timekeeping Functions
    • Real-Time Clock (RTC) Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap-Year Compensation Valid Up to 2100
    • Two Time-of-Day Alarms
    • Programmable Square-Wave Output Defaults to 32kHz on Power-Up
    • Oscillator Stop Flag
  • Interfaces with Most Microcontrollers
    • I2C Serial Interface
  • Surface-Mount Package with an Integrated Crystal (DC1337C) Saves Additional Space and Simplifies Design
  • -40°C to +85°C Industrial Temperature Range Supports Operation in a Wide Range of Applications

Applications/Uses

  • Consumer Electronics (Set-Top Box, VCR/Digital Recording)
  • Handhelds (GPS, POS Terminal, MP3 Player)
  • Medical (Glucometer, Medicine Dispenser)
  • Office Equipment (Fax/Printer, Copier)
  • Other (Utility Meter, Vending Machine, Thermostat, Modem)
  • Telecommunications (Router, Switcher, Server)
Part Number Interface VSUPPLY
(V)
Time Keeping Current
(nA)
CL
(pF)
Memory Type Time of Day Alarms Integrated Resonator Functions Package/Pins Budgetary
Price
typ See Notes
DS1337  I2C
2
3
3.3
5
425 6 None 2 - RTC
µMAX/8
PDIP(N)/8
SOIC/16
SOIC(N)/8
$1.16 @1k
DS1337C  XTAL
µMAX/8
PDIP(N)/8
SOIC/16
SOIC(N)/8
$2.39 @1k
See All Timekeeping & Real-Time Clocks (76)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

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