PCF8563T/F4,112

Real Time Clock Overview

The PCF8563T/F4,112 is a CMOS Real-Time Clock (RTC) and calendar optimized for low power consumption. It provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz quartz crystal. The device features a 400 kHz two-wire I²C-bus interface with target addresses A2h (write) and A3h (read). Operating voltage ranges from 1.0 V to 5.5 V at room temperature, with a typical backup current of 0.25 μA at VDD = 3.0 V and Tamb = 25 °C. It includes programmable clock outputs, alarm/timer functions, an integrated oscillator capacitor, internal Power-On Reset (POR), and an open-drain interrupt pin.

Real Time Clock Feature Summary

• Provides complete timekeeping (year/month/day/weekday/hours/minutes/seconds) using a 32.768 kHz quartz crystal.
• Supports 400 kHz I²C-bus interface operating at VDD levels between 1.8 V and 5.5 V.
• Features low backup current of typically 0.25 μA at VDD = 3.0 V and Tamb = 25 °C.
• Includes programmable clock output (32.768 kHz, 1.024 kHz, 32 Hz, 1 Hz), alarm, timer, and voltage-low detector.

Real Time Clock Applications

• Mobile telephones
• Portable instruments
• Electronic metering
• Battery-powered products

Real Time Clock Procurement Notes

Verify the ordering suffix /F4,112 against the manufacturer's official documentation to confirm specific packaging or tape-and-reel specifications. Ensure compatibility with system requirements regarding the SO8 package dimensions and electrical parameters before procurement.

Real Time Clock Selection Notes

Select this component for applications requiring precise timekeeping with minimal power consumption. Verify that the supply voltage range (1.0 V to 5.5 V) aligns with the system design. Consider the integrated oscillator capacitor and internal POR when designing the external circuitry to simplify layout.

Real Time Clock Part Context

The PCF8563T/F4,112 belongs to the PCF8563 family of real-time clocks manufactured by NXP Semiconductors. It is housed in an SO8 plastic small outline package (SOT96-1). This part is designated as not recommended for new designs, with PCF85063ATL listed as the replacement part.

Real Time Clock Replacement Considerations

The datasheet explicitly states that the PCF8563 is not recommended for new designs. The confirmed replacement part number provided in the ordering information table is PCF85063ATL.

Real Time Clock FAQ

What are the I²C-bus target addresses for the PCF8563?

The I²C-bus target address for write operations is A2h, and for read operations, it is A3h.

How does the PCF8563 handle leap years?

The PCF8563 compensates for leap years by automatically adding a 29th day to February if the year counter contains a value exactly divisible by 4, including the year 00.

What is the function of the STOP bit in Control_status_1?

The STOP bit allows for accurate starting of the time circuits by holding the upper part of the prescaler in reset, preventing 1 Hz ticks until the bit is cleared.