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DS1337, DS1337C

I²C Serial Real-Time Clock

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

Product Details

Key Features

Parametric specs for Timekeeping & Real-Time Clocks
Interface I2C
VSUPPLY (V) 1.8 to 5.5
Date/ Time Format (hh = sec/100) YY-MM-DD/ HH:MM:SS
Time Keeping Current (nA) (typ) 425
CL (pF) 6
Memory Type None
Time of Day Alarms 2
Package/Pins PDIP/8
SOIC (N)/8
SOIC (W)/16
UMAX/8
Budgetary
Price (See Notes)
1.29
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Simplified Block Diagram

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Parameters

Parametric specs for Timekeeping & Real-Time Clocks
Interface I2C
VSUPPLY (V) 1.8 to 5.5
Date/ Time Format (hh = sec/100) YY-MM-DD/ HH:MM:SS
Time Keeping Current (nA) (typ) 425
CL (pF) 6
Memory Type None
Time of Day Alarms 2
Package/Pins PDIP/8
SOIC (N)/8
SOIC (W)/16
UMAX/8
Budgetary
Price (See Notes)
1.29

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)

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.

Simplified Block Diagram

DS1337, DS1337C: Typical Operating Circuit DS1337, DS1337C: Typical Operating Circuit Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .