Maxim
/
Products
/
Analog
/
Real-Time Clock IC - RTC
/
DS1500
Analog Real-Time Clock IC - RTC DS1500
Top

DS1500

Download

Y2K-Compliant Watchdog RTC with NV Control

Printable Data Sheet Subscribe

Product Details

Key Features

Simplified Block Diagram

Technical Docs

Data Sheet Y2K-Compliant Watchdog RTC with NV Control Dec 14, 2011
App Note Watchdog Timekeeper
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 Selecting a Backup Source for Real-Time Clocks
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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Key Features

  • BCD-Coded Century, Year, Month, Date, Day, Hours, Minutes, and Seconds with Automatic Leap-Year Compensation Valid Up to the Year 2100
  • Programmable Watchdog Timer and RTC Alarm
  • Century Register; Y2K-Compliant RTC
  • Automatic Battery Backup and Write Protection to External SRAM
  • +5V or +3.3V Operation
  • Precision Power-On Reset
  • Power-Control Circuitry Supports System Power-On from Date/Day/Time Alarm or Key Closure
  • 256 Bytes User NV RAM
  • Auxiliary Battery Input
  • Accuracy Better than ±1 Minute/Month at +25°C
  • Day-of-Week/Date Alarm Register
  • Battery Voltage-Level Indicator Flags
  • Optional Industrial Temperature Range: -40°C to +85°C

Applications/Uses

  • Battery-Backed Systems
  • Consumer Electronics
  • Office Equipment
  • Remote Systems
  • Telecom Switches

Description

The DS1500 is a full-function, year 2000-compliant, real-time clock/calendar (RTC) with an alarm, watchdog timer, power-on reset, battery monitors, 256 bytes of on-board nonvolatile (NV) SRAM, NV control for backing up an external SRAM, and a 32.768kHz output. User access to all registers within the DS1500 is accomplished with a byte-wide interface as shown in Figure 7. The RTC registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour binary-coded decimal (BCD) format. Corrections for day of month and leap year are made automatically.

Simplified Block Diagram

DS1500: Typical Operating Circuit DS1500: Typical Operating Circuit Zoom icon

Technical Docs

Data Sheet Y2K-Compliant Watchdog RTC with NV Control Dec 14, 2011
App Note Watchdog Timekeeper
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 Selecting a Backup Source for Real-Time Clocks
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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.