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I2C Interface and low time keeping voltage RTC

NOTE: Datasheet may not yet reflect updated package obsolescence/phase out status or Package Drawing. Please refer to the PRODUCT OPTIONS tab for the most up to date package options and drawings. Please refer to PCN/PDN tabs for most current package obsolescence/phase out status.
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Product Description

The PT7C4337 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 via a 2-wire, bidirectional 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 1.2V.

Table 1 shows the basic functions of PT7C4337. More details are shown in section: overview of functions. 


  • Using external 32.768kHz quartz crystal for PT7C4337

  • Supports I2C-Bus's high speed mode (400 kHz)

  • Includes time (Hour/Minute/Second) and calendar (Year/Month/Date/Day) counter functions (BCD code)

  • Programmable square wave output signal

  • Two Time-of-Day Alarms

  • Oscillator Stop Flag

  • Operating range: 1.8V to 5.5V

  • Timekeeping range: 1.2V to 1.8V 

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Standard
Time Display 12, 24
Interface I2C
Alarm Interrupt 1
Battery Backup 0
Clock Calibration 0

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Technical Documents

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Recommended Soldering Techniques


Additional Technical Documents are available upon request:
Application information, Evaluation board, and Other technical documents

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Orderable Part Number Status Package Environmental Compliance Packing Buy from Distributor /
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Qty. Carrier
PT7C4337LE Obsolete TSSOP-8 GREEN 100 TUBE
PT7C4337LEX Obsolete TSSOP-8 GREEN 2500 T&R
PT7C4337UE Obsolete MSOP-8 LFGP 100 TUBE
PT7C4337UEX Active MSOP-8 TPGP 2500 T&R Contact Sales Request Sample
PT7C4337WE Obsolete SO-8 LFGP 100 TUBE
PT7C4337WEX Active SO-8 TPGP 2500 T&R


Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Digi-Key Electronics 1962 1/19/2022 Europe, Asia, North America Buy Now
Mouser Electronics Inc. 1405 1/19/2022 South America, North America, Asia, Europe, Middle East Buy Now
Request Sample
PT7C4337ZEEX Active W-DFN2030-8 GREEN 3000 T&R Contact Sales Request Sample

Environmental Compliance Legend:
LFF: Pb-Free Finish and RoHS 5/6
TLFP: Totally Pb-Free Product and RoHS 6/6
LFGP: Pb-free Finish and Green Product, RoHS 5/6 and Halogen Free
TPGP: Totally Pb-Free and Green Product, RoHS 6/6 and Halogen Free
GREEN: Halogen-free and RoHS compliant
RoHS: RoHS compliant but NOT halogen-free


Product Change Notices

PCN # Issue Date Implementation Date Subject
PCN-2510 2021-02-26 2021-05-26 Qualified Additional A/T Sites, Fab Site and Data Sheet Change
PCN-2493 2020-12-28 2021-03-28 Qualified Additional A/T Sites and Bill of Materials (BOM)
PCN-2466 2020-07-02 2020-10-02 Package Change and Additional Qualified Plating Source
PCN-2448 2020-02-05 2020-08-05 Device End of Life (EOL)
PCN-2280 2017-07-12 2018-01-12 Device End of Life (EOL)


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