I²C 32-Bit Binary Counter RTC

Low-Voltage, Serial Timekeeping Chip Combines an Ultra-Low-Voltage Clock with Sophisticated Power-Monitoring Circuitry, Power-Fail Switches, and a Switch to Optional Trickle-Charging, Replacing Several Discrete Components with One Chip
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Status Explanations for product status codes

Part Number Status
DS1672 Active: In Production. See Ordering Information for details.


The DS1672 low-voltage serial timekeeping chip incorporates a 32-bit counter and power-monitoring functions. The 32-bit counter is designed to count seconds and can be used to derive time-of-day, week, month, and year by using a software algorithm. A precision, temperature-compensated reference and comparator circuit monitors the status of VCC. When an out-of-tolerance condition occurs, an internal power-fail signal is generated that forces the reset to the active state. When VCC returns to an in-tolerance condition, the reset signal is kept in the active state for 250ms to allow the power supply and processor to stabilize.

Data Sheet

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Key Features

  • 32-Bit Counter
  • I²C Serial Interface
  • Automatic Power-Fail Detect and Switch Circuitry
  • Power-Fail Reset Output
  • Low-Voltage Oscillator Operation (1.3V min)
  • Trickle-Charge Capability
  • Underwriters Laboratories (UL) Recognized

Key Specifications:

Timekeeping & Real-Time Clocks
Part Number Interface VSUPPLY
Time Keeping Current
Memory Type Time of Day Alarms Budgetary
typ See Notes
DS1672  I2C
425 6 None 0 $1.18 @1k
See All Timekeeping & Real-Time Clocks (90)

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.


DS1672: Typical Operating Circuit
Typical Operating Circuit

More Information

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Document Ref.: 19-6032 Rev 5; 2011-10-11
This page last modified: 2011-10-11