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Real Time Clock (I2C)

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The PT7C4563B serial real-time clock is a low-power clock/calendar with 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 the 24-hour format indicator. Table 1 shows the basic functions of PT7C4563B. More details are shown in section: overview of functions.


  • Drop-In Replacement for PT7C4563
  • Supports High-ESR Crystals Up To 100kΩ
  • Using external 32.768kHz quartz crystal
  • 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
  • Oscillator stop flag
  • Low backup current: typ. 400nA at VDD=3.0V and TA=25°C
  • Operating range: 1.3V to 5.5V

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP) Standard
Time Display 24
NV Ram N/A
Interface I2C
Alarm Interrupt 1
Battery Backup 0
Clock Calibration 0

Technical Documents

Recommended Soldering Techniques


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

Request Documents
Orderable Part Number Status Package Environmental Compliance Packing Buy from Distributor /
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Request Samples
Qty. Carrier
PT7C4563BLEX Active TSSOP-8 GREEN 2500 T&R Contact Sales Request Sample
PT7C4563BUEX Active MSOP-8 GREEN 2500 T&R Contact Sales Request Sample
PT7C4563BWEX Active SO-8 TPGP 2500 T&R Contact Sales Request Sample
PT7C4563BZEEX 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