Diodes Incorporated
Back to Real Time Clock (RTC)

PT7C4563BQ (Not Recommended for New Design (NRND))

NRND = Not Recommended for New Design

Automotive Real Time Clock

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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

Related Content


Technical Documents

Recommended Soldering Techniques


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

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2678 2024-03-29 2024-09-25 Device End of Life (EOL)