PCF85263AUKZ

Real Time Clock Overview

The PCF85263AUKZ is a CMOS Real-Time Clock (RTC) and calendar optimized for low power consumption, featuring automatic switching to battery backup upon main power loss. It supports I²C-bus interface with a maximum data rate of 400 kbit/s and operates within a voltage range of 0.9 V to 5.5 V. The device provides year, month, day, weekday, hours, minutes, seconds, and 100th seconds based on a 32.768 kHz quartz crystal. It includes two independent alarms, three timestamp registers, a watchdog timer, and configurable clock outputs. Typical current consumption is 0.28 μA at VDD = 3.0 V and Tamb = 25 °C.

Real Time Clock Feature Summary

• Automatic battery switch-over circuit for continuous operation during power loss
• Two independent alarms and three timestamp registers triggered by events or battery switch
• Programmable clock output frequencies: 32.768 kHz, 16.384 kHz, 8.192 kHz, 4.096 kHz, 2.048 kHz, 1.024 kHz, and 1 Hz
• Configurable oscillator circuit supporting CL = 6 pF, CL = 7 pF, and CL = 12.5 pF

Real Time Clock Applications

• Printers and copiers
• Electronic metering
• Digital cameras
• White goods
• Data loggers

Real Time Clock Procurement Notes

Verify the WLCSP12 package type (SOT2035-1) and dry pack shipping method. Confirm the operating temperature range is -40 °C to +85 °C. Ensure compatibility with the 400 kHz I²C bus interface requirements for the target system design.

Real Time Clock Selection Notes

Select this component when a compact WLCSP12 package is required for space-constrained designs. It is suitable for applications needing precise timekeeping with low power consumption and multiple interrupt sources. Consider the stop-watch mode capability if elapsed time counting is necessary alongside standard RTC functions.

Real Time Clock Part Context

The PCF85263AUKZ belongs to the PCF85263A family of tiny RTCs. It shares functional similarities with other packages in the series, such as SO8, TSSOP8, and DFN2626-10, but differs in physical dimensions and pin configuration. The UK suffix specifically denotes the Wafer Level Chip Scale Package.

Real Time Clock Replacement Considerations

PCF85263ATT1/AZ is listed as a drop-in replacement for discontinued variants, though it uses a TSSOP10 package rather than WLCSP12. Verify mechanical fit and pinout compatibility before substitution.