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DS1337C
I²C Serial Real-Time Clock
Industry's Smallest I²C RTC with Two Time-of-Day Alarms
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The DS1337 serial real-time clock is a low-power clock/calendar with two programmable time-of-day alarms and a programmable square-wave output. Address and data are transferred serially through an I²C bus. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator.
The device is fully accessible through the serial interface while VCC is between 1.8V and 5.5V. I²C operation is not guaranteed below 1.8V. Timekeeping operation is maintained with VCC as low as 1.3V.
The device is fully accessible through the serial interface while VCC is between 1.8V and 5.5V. I²C operation is not guaranteed below 1.8V. Timekeeping operation is maintained with VCC as low as 1.3V.
Key Features
- 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
Applications/Uses
- Consumer Electronics (Set-Top Box, VCR/Digital Recording)
- Handhelds (GPS, POS Terminal, MP3 Player)
- Medical (Glucometer, Medicine Dispenser)
- Office Equipment (Fax/Printer, Copier)
- Other (Utility Meter, Vending Machine, Thermostat, Modem)
- Telecommunications (Router, Switcher, Server)
Parametric specs for Timekeeping & Real-Time Clocks
| Interface | I2C |
| VSUPPLY (V) | 2 3 5 |
| Date/ Time Format (hh = sec/100) | YY-MM-DD/ HH:MM:SS |
| Time Keeping Current (nA) (typ) | 425 |
| CL (pF) | 6 |
| Memory Type | None |
| Time of Day Alarms | 2 |
| Integrated Resonator | XTAL |
| Package/Pins | SOIC(N)/8 |
| Budgetary Price (See Notes) | $2.40 @1k |
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Technical Docs
| Data Sheet | I²C Serial Real-Time Clock | Apr 27, 2015 |
Click any title below to view the detail page where available.
Support & Training
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Parameters
Parametric specs for Timekeeping & Real-Time Clocks
| Interface | I2C |
| VSUPPLY (V) | 2 3 5 |
| Date/ Time Format (hh = sec/100) | YY-MM-DD/ HH:MM:SS |
| Time Keeping Current (nA) (typ) | 425 |
| CL (pF) | 6 |
| Memory Type | None |
| Time of Day Alarms | 2 |
| Integrated Resonator | XTAL |
| Package/Pins | SOIC(N)/8 |
| Budgetary Price (See Notes) | $2.40 @1k |
Key Features
- 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
Applications/Uses
- Consumer Electronics (Set-Top Box, VCR/Digital Recording)
- Handhelds (GPS, POS Terminal, MP3 Player)
- Medical (Glucometer, Medicine Dispenser)
- Office Equipment (Fax/Printer, Copier)
- Other (Utility Meter, Vending Machine, Thermostat, Modem)
- Telecommunications (Router, Switcher, Server)
Description
The DS1337 serial real-time clock is a low-power clock/calendar with two programmable time-of-day alarms and a programmable square-wave output. Address and data are transferred serially through an I²C bus. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator.
The device is fully accessible through the serial interface while VCC is between 1.8V and 5.5V. I²C operation is not guaranteed below 1.8V. Timekeeping operation is maintained with VCC as low as 1.3V.
The device is fully accessible through the serial interface while VCC is between 1.8V and 5.5V. I²C operation is not guaranteed below 1.8V. Timekeeping operation is maintained with VCC as low as 1.3V.
Technical Docs
| Data Sheet | I²C Serial Real-Time Clock | Apr 27, 2015 |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal
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