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DS1340
Analog Real-Time Clock IC - RTC DS1340
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DS1340, DS1340C

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I²C RTC with Trickle Charger

I²C Real-Time Clock with Trickle Charger Offers Software Clock Calibration

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Product Details

See parametric specs for Timekeeping & Real-Time Clocks

Key Features

See parametric specs for Timekeeping & Real-Time Clocks
Parametric specs for Timekeeping & Real-Time Clocks
Interface I2C
VSUPPLY (V) 1.71 to 5.5
Date/ Time Format (hh = sec/100) YY-MM-DD/ HH:MM:SS
Time Keeping Current (nA) (typ) 800
CL (pF) 12.5
Memory Type None
Time of Day Alarms 0
Package/Pins SOIC (N)/8
SOIC (W)/16
UMAX/8
Budgetary
Price (See Notes) 		1.68
Compare products in Family
See parametric specs for Timekeeping & Real-Time Clocks
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Simplified Block Diagram

Technical Docs

Data Sheet I²C RTC with Trickle Charger Apr 27, 2015
App Note Using the DS32kHz with Maxim Real-Time Clocks
App Note Demonstrating Green Technology with Apples, Oranges, Lemons, and Limes
App Note Oscillator Design Considerations for Low-Current Applications
App Note Lithium Coin-Cell Batteries: Predicting an Application Lifetime
App Note Design Considerations for Maxim Real-Time Clocks
App Note Crystal Considerations with Maxim Real-Time Clocks (RTCs)
App Note Adding Intelligence to LED Lighting
App Note Selecting a Backup Source for Real-Time Clocks
App Note FAQ About the Integrated-Crystal Package Option
App Note Estimating Super Capacitor Backup Time on Trickle-Charger Real-Time Clocks
App Note Interfacing the DS1307 with an 8051-Compatible Microcontroller
App Note Using the Dallas Tricklecharge Timekeeper
Tutorial State Machine Logic in Binary-Coded Decimal (BCD)-Formatted Real-Time Clocks
Tutorial Tips for Writing Bulletproof Real-Time Clock Control Code

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 .

Parameters

Parametric specs for Timekeeping & Real-Time Clocks
Interface I2C
VSUPPLY (V) 1.71 to 5.5
Date/ Time Format (hh = sec/100) YY-MM-DD/ HH:MM:SS
Time Keeping Current (nA) (typ) 800
CL (pF) 12.5
Memory Type None
Time of Day Alarms 0
Package/Pins SOIC (N)/8
SOIC (W)/16
UMAX/8
Budgetary
Price (See Notes) 		1.68
Compare products in Family
See parametric specs for Timekeeping & Real-Time Clocks

Key Features

  • Enhanced Second Source for the ST M41T00
  • Completely Manages All Timekeeping Functions
    • RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year
    • Software Clock Calibration
    • Oscillator Stop Flag
  • Low-Power Operation Extends Battery Backup Run Time
    • Low Timekeeping Voltage Down to 1.3V
    • Automatic Power-Fail Detect and Switch Circuitry
    • Trickle-Charge Capability
  • Three Operating Voltage Ranges (1.8V, 3V, and 3.3V) Supports Systems Using Legacy and Modern Power Buses
  • Surface-Mount Package with an Integrated Crystal (DS1340C) Saves Additional Space and Simplifies Design
  • Simple Serial Port Interfaces with Most Microcontrollers
    • Fast (400kHz) I2C Interface
  • 8-Pin µSOP or SO Package Minimizes Required Space
  • Underwriters Laboratories (UL®) Recognized

Applications/Uses

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

Description

The DS1340 is a real-time clock (RTC)/calendar that is pin compatible and functionally equivalent to the ST M41T00, including the software clock calibration. The device additionally provides trickle-charge capability on the VBACKUP pin, a lower timekeeping voltage, and an oscillator STOP flag. Block access of the register map is identical to the ST device. Two additional registers, which are accessed individually, are required for the trickle charger and flag. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. A built-in power-sense circuit detects power failures and automatically switches to the backup supply. The device is programmed serially through an I²C bidirectional bus.

Simplified Block Diagram

DS1340, DS1340C: Typical Operating Circuit DS1340, DS1340C: Typical Operating Circuit Zoom icon

Technical Docs

Data Sheet I²C RTC with Trickle Charger Apr 27, 2015
App Note Using the DS32kHz with Maxim Real-Time Clocks
App Note Demonstrating Green Technology with Apples, Oranges, Lemons, and Limes
App Note Oscillator Design Considerations for Low-Current Applications
App Note Lithium Coin-Cell Batteries: Predicting an Application Lifetime
App Note Design Considerations for Maxim Real-Time Clocks
App Note Crystal Considerations with Maxim Real-Time Clocks (RTCs)
App Note Adding Intelligence to LED Lighting
App Note Selecting a Backup Source for Real-Time Clocks
App Note FAQ About the Integrated-Crystal Package Option
App Note Estimating Super Capacitor Backup Time on Trickle-Charger Real-Time Clocks
App Note Interfacing the DS1307 with an 8051-Compatible Microcontroller
App Note Using the Dallas Tricklecharge Timekeeper
Tutorial State Machine Logic in Binary-Coded Decimal (BCD)-Formatted Real-Time Clocks
Tutorial Tips for Writing Bulletproof Real-Time Clock Control Code

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 .