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Real-time clock (RTC) ICs are used in electronic circuits to keep track of time relative to the “real” world. Maintaining accurate time is critical, especially under periods of severe system stress or when the power of the main device is off. During these times, RTC ICs must provide robust performance and will often draw power from an auxiliary battery or supercapacitor. As expected, power consumption is a key factor in most real-time clock designs, in addition to accuracy, ruggedness, and small package size. Most modern RTCs reduce the number of pins required by supporting a serial interface. We offer a wide variety of highly accurate, low-power, small-package, and MEMS (microelectromechanical systems)-based real-time clocks to suit any of your solution needs.

  • Power is reduced with ICs that contain automatic gain control (AGC) circuitry.
  • MEMs-based RTCs provide improved tolerance to shock and vibration.
  • The patented SYNC feature allows the RTC to sync with an external signal.
  • RTCs with integrated crystals or MEMS oscillators offer multiple ways to minimize board space.

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Featured Blogs

Videos


How to Set Up an Ultra-Low-Power Real-Time Clock, Part I – Using the MAX32630 Microcontroller
3:45 November 29, 2017


How to Set Up an Ultra-Low Power Real-Time Clock II Using the MAX32630FTHR
3:43 February 28, 2018


How to Use the MAX31342SHLD Evaluation Kit
4:43 August 13, 2019

Featured Products

DS1339B Low-Current, I2C, Serial Real-Time Clock for High-ESR Crystals
The DS1339B serial real-time clock (RTC) is a low-power clock/date device with two programmable ...
  • Drop-In Replacement for DS1339
  • Supports High-ESR Crystals Up to 100kΩ to Allow Crystals to be Optimized for Cost and Space
  • Completely Manages All Timekeeping Functions
    • Real-Time Clock Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Compensation Valid Up to 2200
    • Two Time-of-Day Alarms
    • Programmable Square-Wave Output Signal
  • Low-Power Operation Extends Battery Backup Run Time
    • Automatic Power-Fail Detect and Switch Circuitry
  • Simple Serial Port Interfaces to Most Microcontrollers
    • I2C Serial Interface
  • Underwriters Laboratories (UL®) Recognized
DS3231M ±5ppm, I2C Real-Time Clock
The DS3231M is a low-cost, extremely accurate, I2C real-time clock (RTC). The device incorporate...
  • Highly Accurate RTC With Integrated MEMS Resonator Completely Manages All Timekeeping Functions
    • Complete Clock Calendar Functionality Including Seconds, Minutes, Hours, Day, Date, Month, and Year, with Leap-Year Compensation Up to Year 2100
    • Timekeeping Accuracy ±5ppm (±0.432 Second/Day) from -45°C to +85°C
    • Footprint and Functionally Compatible to DS3231
    • Two Time-of-Day Alarms
    • 1Hz and 32.768kHz Outputs
    • Reset Output and Pushbutton Input with Debounce
    • Digital Temp Sensor with ±3°C Accuracy
    • +2.3V to +5.5V Supply Voltage
  • Simple Serial Interface Connects to Most Microcontrollers
    • Fast (400kHz) I2C Interface
  • Battery-Backup Input for Continuous Timekeeping
    • Low Power Operation Extends Battery-Backup Run Time
  • Operating Temperature Range: (-40°C to +85°C)
  • 8-Pin or 16-Pin SO Packages
  • Underwriters Laboratories® (UL) Recognized
Download Data Sheet Evaluation Kit
MAX31343 ±5ppm, I2C Real-Time Clock with Integrated MEMS Oscillator
The MAX31343 is a low-cost, extremely accurate, I2C real-time clock (RTC). The device incorporat...
  • Highly Accurate RTC with Integrated MEMS Resonator Completely Manages All Timekeeping Functions
    • Complete Clock Calendar Functionality Including Seconds, Minutes, Hours, Day, Date, Month, Year, and Century with Leap-Year Compensation Up to Year 2199
    • Timekeeping Accuracy ±5ppm (±0.432 second/day) from -40°C to 85°C
    • Two Time-of-Day Alarms
    • Temperature-Compensated Programmable Square-Wave Output
    • Uncompensated Programmable Clock Outputs
    • Automatically Switch over to Backup Battery or Supercapacitor on Power-Fail
    • Digital Temperature Sensor with ±3°C Accuracy
    • +1.6V to +5.5V Supply Voltage
  • 64-Byte RAM for User Data Storage
  • Simple Serial Interface Connects to Most Microcontrollers
    • I2C Interface
  • Battery-Backup Input for Continuous Timekeeping
  • Low-Power Operation Extends Battery-Backup Runtime
  • Operating Temperature Range: -40°C to 85°C
  • 2.1mm x 2.3mm, 8-Pin WLP Package
  • 4mm x 3mm, 8-Pin TDFN Package
  • Underwriters Laboratories® (UL) Recognized
MAX31341B Low-Current, Real-Time Clock with I2C Interface and Power Management
The MAX31341B/MAX31341C low-current, real-time clock (RTC) is a time-keeping device that provide...
  • Increases Battery Life
    • 180nA Timekeeping Current
    • Wide Range of External Crystals with CL = 6pF and ESR up to 100kΩ for Minimal Current Draw
    • Trickle Charger for External Super Capacitor or Rechargeable Battery
  • Provides Flexible Configurability
    • A Schmitt Trigger Input to Trigger Interrupt
    • One Analog Input with Adjustable Threshold to Trigger Interrupt
    • Programmable Square Wave Output for Clock Monitoring
  • Saves Board Space
    • Integrated Load Capacitors for Crystal Oscillator
    • 2mm x 1.5mm, 12-Bump WLP with 0.5mm Pitch
    • 3mm x 3mm, 10-pin TDFN
  • Value Add Features for Ease-of-Use
    • +1.6V to +3.6V Operating Voltage Range
    • Countdown Timer with Repeat and Pause Functions
    • 64-Byte RAM for User Data Storage
  • Integrated Protection
    • Power-On Reset for Default Configuration
    • Automatic Switchover to Backup Battery or Super Capacitor On Power Fail
    • Lockup-Free Operation with Bus Timeout
MAX31341C Low-Current, Real-Time Clock with I2C Interface and Power Management
The MAX31341B/MAX31341C low-current, real-time clock (RTC) is a time-keeping device that provide...
  • Increases Battery Life
    • 180nA Timekeeping Current
    • Wide Range of External Crystals with CL = 6pF and ESR up to 100kΩ for Minimal Current Draw
    • Trickle Charger for External Super Capacitor or Rechargeable Battery
  • Provides Flexible Configurability
    • A Schmitt Trigger Input to Trigger Interrupt
    • One Analog Input with Adjustable Threshold to Trigger Interrupt
    • Programmable Square Wave Output for Clock Monitoring
  • Saves Board Space
    • Integrated Load Capacitors for Crystal Oscillator
    • 2mm x 1.5mm, 12-Bump WLP with 0.5mm Pitch
    • 3mm x 3mm, 10-pin TDFN
  • Value Add Features for Ease-of-Use
    • +1.6V to +3.6V Operating Voltage Range
    • Countdown Timer with Repeat and Pause Functions
    • 64-Byte RAM for User Data Storage
  • Integrated Protection
    • Power-On Reset for Default Configuration
    • Automatic Switchover to Backup Battery or Super Capacitor On Power Fail
    • Lockup-Free Operation with Bus Timeout
MAX31342 Low-Current, Real-Time Clock with I2C Interface
The MAX31342 low-current, real-time clock (RTC) is a time-keeping device that provides an extrem...
  • Increases Battery Life
    • 150nA Timekeeping Current
    • Wide Range of External Crystals with CL = 6pF and ESR up to 100kΩ for Minimal Current Draw
  • Provides Flexible Configurability
    • Programmable Square Wave Output for Clock Monitoring
  • Saves Board Space
    • Integrated Load Capacitors for Crystal Oscillator
    • 1mm x 2mm, 8-Bump WLP with 0.5mm Pitch
  • Value Add Features for Ease of Use
    • +1.6V to +3.6V Operating Voltage Range
    • Countdown Timer with Repeat Function
  • Integrated Protection
    • Power-On Reset for Default Configuration
    • Lockup-Free Operation with Bus Timeout
DS17487 3V/5V Real-Time Clocks
The DS17285, DS17485, DS17885, DS17287, DS17487, and DS17887 real-time clocks (RTCs) are designe...
  • Incorporates Industry-Standard DS12887 PC Clock Plus Enhanced Functions
  • RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Through 2099
  • Optional +3.0V or +5.0V Operation
  • SMI Recovery Stack
  • 64-Bit Silicon Serial Number
  • Power-Control Circuitry Supports System Power-On from Date/Time Alarm or Key Closure
  • Crystal Select Bit Allows Operation with 6pF or 12.5pF Crystal
  • 12-Hour or 24-Hour Clock with AM and PM in 12-Hour Mode
  • 114 Bytes of General-Purpose, Battery-Backed NV SRAM
  • Extended Battery-Backed NV SRAM
    • 2048 Bytes (DS17285/DS17287)
    • 4096 Bytes (DS17485/DS17487)
    • 8192 Bytes (DS17885/DS17887)
  • RAM Clear Function
  • Interrupt Output with Six Independently Maskable Interrupt Flags
  • Time-of-Day Alarm Once per Second to Once per Day
  • End of Clock Update Cycle Flag
  • Programmable Square-Wave Output
  • Automatic Power-Fail Detect and Switch Circuitry
  • Available in PDIP, SO, or TSOP Package (DS17285, DS17485, DS17885)
  • Optional Encapsulated DIP (EDIP) Package with Integrated Crystal and Battery (DS17287, DS17487, DS17887)
  • Optional Industrial Temperature Range Available
DS17485 3V/5V Real-Time Clocks
The DS17285, DS17485, DS17885, DS17287, DS17487, and DS17887 real-time clocks (RTCs) are designe...
  • Incorporates Industry-Standard DS12887 PC Clock Plus Enhanced Functions
  • RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Through 2099
  • Optional +3.0V or +5.0V Operation
  • SMI Recovery Stack
  • 64-Bit Silicon Serial Number
  • Power-Control Circuitry Supports System Power-On from Date/Time Alarm or Key Closure
  • Crystal Select Bit Allows Operation with 6pF or 12.5pF Crystal
  • 12-Hour or 24-Hour Clock with AM and PM in 12-Hour Mode
  • 114 Bytes of General-Purpose, Battery-Backed NV SRAM
  • Extended Battery-Backed NV SRAM
    • 2048 Bytes (DS17285/DS17287)
    • 4096 Bytes (DS17485/DS17487)
    • 8192 Bytes (DS17885/DS17887)
  • RAM Clear Function
  • Interrupt Output with Six Independently Maskable Interrupt Flags
  • Time-of-Day Alarm Once per Second to Once per Day
  • End of Clock Update Cycle Flag
  • Programmable Square-Wave Output
  • Automatic Power-Fail Detect and Switch Circuitry
  • Available in PDIP, SO, or TSOP Package (DS17285, DS17485, DS17885)
  • Optional Encapsulated DIP (EDIP) Package with Integrated Crystal and Battery (DS17287, DS17487, DS17887)
  • Optional Industrial Temperature Range Available
DS17887 3V/5V Real-Time Clocks
The DS17285, DS17485, DS17885, DS17287, DS17487, and DS17887 real-time clocks (RTCs) are designe...
  • Incorporates Industry-Standard DS12887 PC Clock Plus Enhanced Functions
  • RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Through 2099
  • Optional +3.0V or +5.0V Operation
  • SMI Recovery Stack
  • 64-Bit Silicon Serial Number
  • Power-Control Circuitry Supports System Power-On from Date/Time Alarm or Key Closure
  • Crystal Select Bit Allows Operation with 6pF or 12.5pF Crystal
  • 12-Hour or 24-Hour Clock with AM and PM in 12-Hour Mode
  • 114 Bytes of General-Purpose, Battery-Backed NV SRAM
  • Extended Battery-Backed NV SRAM
    • 2048 Bytes (DS17285/DS17287)
    • 4096 Bytes (DS17485/DS17487)
    • 8192 Bytes (DS17885/DS17887)
  • RAM Clear Function
  • Interrupt Output with Six Independently Maskable Interrupt Flags
  • Time-of-Day Alarm Once per Second to Once per Day
  • End of Clock Update Cycle Flag
  • Programmable Square-Wave Output
  • Automatic Power-Fail Detect and Switch Circuitry
  • Available in PDIP, SO, or TSOP Package (DS17285, DS17485, DS17885)
  • Optional Encapsulated DIP (EDIP) Package with Integrated Crystal and Battery (DS17287, DS17487, DS17887)
  • Optional Industrial Temperature Range Available
DS17287 3V/5V Real-Time Clocks
The DS17285, DS17485, DS17885, DS17287, DS17487, and DS17887 real-time clocks (RTCs) are designe...
  • Incorporates Industry-Standard DS12887 PC Clock Plus Enhanced Functions
  • RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Through 2099
  • Optional +3.0V or +5.0V Operation
  • SMI Recovery Stack
  • 64-Bit Silicon Serial Number
  • Power-Control Circuitry Supports System Power-On from Date/Time Alarm or Key Closure
  • Crystal Select Bit Allows Operation with 6pF or 12.5pF Crystal
  • 12-Hour or 24-Hour Clock with AM and PM in 12-Hour Mode
  • 114 Bytes of General-Purpose, Battery-Backed NV SRAM
  • Extended Battery-Backed NV SRAM
    • 2048 Bytes (DS17285/DS17287)
    • 4096 Bytes (DS17485/DS17487)
    • 8192 Bytes (DS17885/DS17887)
  • RAM Clear Function
  • Interrupt Output with Six Independently Maskable Interrupt Flags
  • Time-of-Day Alarm Once per Second to Once per Day
  • End of Clock Update Cycle Flag
  • Programmable Square-Wave Output
  • Automatic Power-Fail Detect and Switch Circuitry
  • Available in PDIP, SO, or TSOP Package (DS17285, DS17485, DS17885)
  • Optional Encapsulated DIP (EDIP) Package with Integrated Crystal and Battery (DS17287, DS17487, DS17887)
  • Optional Industrial Temperature Range Available
DS17285 3V/5V Real-Time Clocks
The DS17285, DS17485, DS17885, DS17287, DS17487, and DS17887 real-time clocks (RTCs) are designe...
  • Incorporates Industry-Standard DS12887 PC Clock Plus Enhanced Functions
  • RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Through 2099
  • Optional +3.0V or +5.0V Operation
  • SMI Recovery Stack
  • 64-Bit Silicon Serial Number
  • Power-Control Circuitry Supports System Power-On from Date/Time Alarm or Key Closure
  • Crystal Select Bit Allows Operation with 6pF or 12.5pF Crystal
  • 12-Hour or 24-Hour Clock with AM and PM in 12-Hour Mode
  • 114 Bytes of General-Purpose, Battery-Backed NV SRAM
  • Extended Battery-Backed NV SRAM
    • 2048 Bytes (DS17285/DS17287)
    • 4096 Bytes (DS17485/DS17487)
    • 8192 Bytes (DS17885/DS17887)
  • RAM Clear Function
  • Interrupt Output with Six Independently Maskable Interrupt Flags
  • Time-of-Day Alarm Once per Second to Once per Day
  • End of Clock Update Cycle Flag
  • Programmable Square-Wave Output
  • Automatic Power-Fail Detect and Switch Circuitry
  • Available in PDIP, SO, or TSOP Package (DS17285, DS17485, DS17885)
  • Optional Encapsulated DIP (EDIP) Package with Integrated Crystal and Battery (DS17287, DS17487, DS17887)
  • Optional Industrial Temperature Range Available
DS17885 3V/5V Real-Time Clocks
The DS17285, DS17485, DS17885, DS17287, DS17487, and DS17887 real-time clocks (RTCs) are designe...
  • Incorporates Industry-Standard DS12887 PC Clock Plus Enhanced Functions
  • RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Through 2099
  • Optional +3.0V or +5.0V Operation
  • SMI Recovery Stack
  • 64-Bit Silicon Serial Number
  • Power-Control Circuitry Supports System Power-On from Date/Time Alarm or Key Closure
  • Crystal Select Bit Allows Operation with 6pF or 12.5pF Crystal
  • 12-Hour or 24-Hour Clock with AM and PM in 12-Hour Mode
  • 114 Bytes of General-Purpose, Battery-Backed NV SRAM
  • Extended Battery-Backed NV SRAM
    • 2048 Bytes (DS17285/DS17287)
    • 4096 Bytes (DS17485/DS17487)
    • 8192 Bytes (DS17885/DS17887)
  • RAM Clear Function
  • Interrupt Output with Six Independently Maskable Interrupt Flags
  • Time-of-Day Alarm Once per Second to Once per Day
  • End of Clock Update Cycle Flag
  • Programmable Square-Wave Output
  • Automatic Power-Fail Detect and Switch Circuitry
  • Available in PDIP, SO, or TSOP Package (DS17285, DS17485, DS17885)
  • Optional Encapsulated DIP (EDIP) Package with Integrated Crystal and Battery (DS17287, DS17487, DS17887)
  • Optional Industrial Temperature Range Available
DS2417 1-Wire Time Chip With Interrupt
The DS2417 1-Wire Time Chip with Interrupt offers a simple solution for storing and retrieving v...
  • Real-time clock (RTC) with fully compatible 1-Wire® MicroLAN interface
  • Uses the same binary time/date representation as the DS2404 but with 1 second resolution
  • Clock accuracy ±2 minutes per month at 25°C
  • Programmable interrupt output for system wakeup
  • Communicates at 16.3kbits per second
  • Unique, factory-lasered and tested 64-bit registration number (8-bit family code + 48-bit serial number + 8-bit CRC tester) assures absolute traceability because no two parts are alike
  • 8-bit family code specifies device communication requirements to bus master
  • Built-in multidrop controller ensures compatibility with other MicroLAN products
  • Operates over a wide VDD voltage range of 2.5V to 5.5V from -40°C to +85°C
  • Low power, 200nA typically with oscillator running
  • Compact, low cost 6-pin TSOC and Flip-Chip surface mount package
DS1342 Low-Current I²C RTCs for High-ESR Crystals
The DS1341/DS1342 low-current real-time clocks (RTCs) are timekeeping devices that provide an ex...
  • Low Timekeeping Current of 250nA (typ)
  • Compatible with Crystal ESR Up to 100kΩ
  • Use Crystals with CL = 6pF (DS1341) or CL= 12.5pF (DS1342)
  • +1.8V to +5.5V Operating Voltage Range
  • Maintain Time Down to +1.15V (typ)
  • Fast (400kHz) I²C Interface
  • Bus Timeout for Lockup-Free Operation
  • RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Valid Through 2099
  • External Clock Source for Synchronization Clock Reference (e.g., 32kHz, 50Hz/60Hz Power Line, GPS 1PPS)
  • Two Time-of-Day Alarm with Two Interrupt Outputs
  • Programmable Square-Wave Output
  • Industrial Temperature Range (-40°C to +85°C)
  • Small, 8-Pin µSOP or TDFN Packages
DS1341 Low-Current I²C RTCs for High-ESR Crystals
The DS1341/DS1342 low-current real-time clocks (RTCs) are timekeeping devices that provide an ex...
  • Low Timekeeping Current of 250nA (typ)
  • Compatible with Crystal ESR Up to 100kΩ
  • Use Crystals with CL = 6pF (DS1341) or CL= 12.5pF (DS1342)
  • +1.8V to +5.5V Operating Voltage Range
  • Maintain Time Down to +1.15V (typ)
  • Fast (400kHz) I²C Interface
  • Bus Timeout for Lockup-Free Operation
  • RTC Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Valid Through 2099
  • External Clock Source for Synchronization Clock Reference (e.g., 32kHz, 50Hz/60Hz Power Line, GPS 1PPS)
  • Two Time-of-Day Alarm with Two Interrupt Outputs
  • Programmable Square-Wave Output
  • Industrial Temperature Range (-40°C to +85°C)
  • Small, 8-Pin µSOP or TDFN Packages
DS1337 I²C Serial Real-Time Clock
The DS1337 serial real-time clock is a low-power clock/calendar with two programmable time-of-da...
  • Completely Manages All Timekeeping Functions
    • Real-Time Clock (RTC) Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap-Year Compensation Valid Up to 2100
    • Two Time-of-Day Alarms
    • Programmable Square-Wave Output Defaults to 32kHz on Power-Up
    • Oscillator Stop Flag
  • Interfaces with Most Microcontrollers
    • I2C Serial Interface
  • Surface-Mount Package with an Integrated Crystal (DC1337C) Saves Additional Space and Simplifies Design
  • -40°C to +85°C Industrial Temperature Range Supports Operation in a Wide Range of Applications
DS1347 Low-Current, SPI-Compatible Real-Time Clock
The DS1347 SPI-compatible real-time clock (RTC) contains a real-time clock/calendar and 31 x 8 b...
  • Completely Manages All Timekeeping Functions
    • RTC Counts Seconds, Minutes, Hours, Day of Week, Date of Month, Month, Year, and Century
    • Leap-Year Compensation
    • 31 x 8-Bit SRAM for Scratchpad Data Storage
    • Programmable Time/Date Polled ALARM Function
    • Uses Standard 32.768kHz Watch Crystal
  • Low-Power Operation Extends Battery Life
    • Low Timekeeping Current (400nA at 2V)
    • +2V to +5.5V Wide Operating Voltage Range
  • Standard Serial Port Interfaces with Most Microcontrollers
    • SPI (Mode 1 or 3) Interface: 4MHz at 5V, 1MHz at 2V
    • Single-Byte or Multiple-Byte (Burst Mode) Data Transfer for Read or Write of Clock Registers or SRAM
  • 3mm x 3mm x 0.8mm, 8-Pin TDFN Package Minimizes Required Space
    • No External Crystal Bias Resistors or Capacitors Required
DS1337C I²C Serial Real-Time Clock
The DS1337 serial real-time clock is a low-power clock/calendar with two programmable time-of-da...
  • Completely Manages All Timekeeping Functions
    • Real-Time Clock (RTC) Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap-Year Compensation Valid Up to 2100
    • Two Time-of-Day Alarms
    • Programmable Square-Wave Output Defaults to 32kHz on Power-Up
    • Oscillator Stop Flag
  • Interfaces with Most Microcontrollers
    • I2C Serial Interface
  • Surface-Mount Package with an Integrated Crystal (DC1337C) Saves Additional Space and Simplifies Design
  • -40°C to +85°C Industrial Temperature Range Supports Operation in a Wide Range of Applications