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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

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) Binary
Time Keeping Current (nA) (typ) 425
CL (pF) 6
Memory Type None
Time of Day Alarms 0
Package/Pins SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
1.45
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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) Binary
Time Keeping Current (nA) (typ) 425
CL (pF) 6
Memory Type None
Time of Day Alarms 0
Package/Pins SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
1.45

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

Applications/Uses

Description

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.

Simplified Block Diagram

DS1672: Typical Operating Circuit DS1672: 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 .