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DS1374C, DS1374U

I²C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output

Elapsed Time Counter Provides Power-On Reset, Watchdog or Alarm, and Square Wave

Product Details

Key Features

Parametric specs for Timekeeping & Real-Time Clocks
Interface I2C
VSUPPLY (V) 1.7 to 5.5
Date/ Time Format (hh = sec/100) Binary
Time Keeping Current (nA) (typ) 400
CL (pF) 6
Memory Type None
Time of Day Alarms 1
Integrated Resonator XTAL
Package/Pins See Data Sheet
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Simplified Block Diagram

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Parameters

Parametric specs for Timekeeping & Real-Time Clocks
Interface I2C
VSUPPLY (V) 1.7 to 5.5
Date/ Time Format (hh = sec/100) Binary
Time Keeping Current (nA) (typ) 400
CL (pF) 6
Memory Type None
Time of Day Alarms 1
Integrated Resonator XTAL
Package/Pins See Data Sheet

Key Features

  • 32-Bit Binary Counter
  • Second Binary Counter Provides Time-of-Day Alarm, Watchdog Timer, or NV RAM
  • Separate Square-Wave and Interrupt Output Pins
  • I²C Serial Interface
  • Automatic Power-Fail Detect and Switch Circuitry
  • Single-Pin Pushbutton Reset Input/Open-Drain Reset Output
  • Low-Voltage Operation
  • Trickle-Charge Capability
  • -40°C to +85°C Operating Temperature Range
  • 10-Pin µSOP, 16-Pin SO
  • Available in a Surface-Mount Package with an Integrated Crystal (DS1374C)

Applications/Uses

  • Medical Equipment
  • Point-of-Sale Equipment
  • Portable Instrumentation
  • Telecommunications

Description

The DS1374 is a 32-bit binary counter designed to continuously count time in seconds. An additional counter generates a periodic alarm or serves as a watchdog timer. If disabled, this counter can be used as 3 bytes of nonvolatile (NV) RAM. Separate output pins are provided for an interrupt and a square wave at one of four selectable frequencies. A precision temperature-compensated reference and comparator circuit monitor the status of VCC to detect power failures, provide a reset output, and automatically switch to the backup supply when necessary.

Additionally, the reset pin is monitored as a pushbutton input for externally generating a reset. The device is programmed serially through an I²C serial interface.

Simplified Block Diagram

DS1374, DS1374C, DS1374U: Typical Operating Circuit DS1374, DS1374C, DS1374U: Typical Operating Circuit Zoom icon

Technical Docs

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 .