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The PT7C4563BQ serial real-time clock is an automotive-grade low-power clock/calendar with a programmable square-wave output. It supports up to 125°C operating temperature.

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 PT7C4563BQ. More details are shown in the Overview of Functions section.


  • Drop-in Replacement for PT7C4563
  • Supports High-ESR Crystals up to 100kΩ
  • Uses External 32.768kHz Quartz Crystal
  • Supports I2C Bus' High-Speed Mode (400kHz)
  • 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
  • Extended Operating Temp: -40°C to 125°C
  • AECQ-100 Compliant for Automotive Application
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • PPAP Capable (Note 4)
  • Packaging (Pb-free & Green): 8-Pins, SOIC (W)

Product Specifications

Product Parameters

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

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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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Qty. Carrier
PT7C4563BQ1WEX Active SO-8 LFGP 2500 T&R


Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Digi-Key Electronics 2080 1/24/2022 Europe, Asia, North America Buy Now
Mouser Electronics Inc. 3337 1/24/2022 South America, North America, Asia, Europe, Middle East Buy Now
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


Related Application FAQs