PCF85363ATL/AX

Real Time Clock Overview

The PCF85363ATL/AX 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 provides year, month, day, weekday, hours, minutes, seconds, and 100th seconds based on a 32.768 kHz quartz crystal. The device includes two independent alarms, three timestamp registers triggered by battery switch-over or input events, and 64 bytes of battery-backed-up RAM. Operating voltages range from 0.9 V to 5.5 V with typical standby current of 0.28 μA at 3.0 V. It supports a 400 kHz I²C interface and programmable clock outputs.

Real Time Clock Feature Summary

• Automatic battery switch-over circuit with three timestamp registers for power failure logging
• Stop-watch mode capable of counting elapsed time from 100th seconds up to 999,999 hours
• Two independent alarms and configurable interrupt generators with predefined periodic interrupts
• Programmable offset register for frequency adjustment and configurable oscillator load capacitors (6 pF, 7 pF, 12.5 pF)

Real Time Clock Applications

• Elapsed time counter applications
• Network powered devices requiring precise timing
• Printers and copiers
• Battery backed up systems
• Digital voice recorders

Real Time Clock Procurement Notes

Verify the ordering part number PCF85363ATL/AX corresponds to the DFN2626-10 package in the REEL 7" Q1 NDP packing method with a minimum order quantity of 4000 units. Confirm the temperature range is -40 °C to +85 °C. Check for discontinuation notices regarding replacement parts such as PCF85363ATT1/AZ if alternative packaging is required.

Real Time Clock Selection Notes

Select this component when a tiny RTC with integrated timestamping for power failures is required. Ensure the application voltage falls within the 0.9 V to 5.5 V range. Verify that the DFN2626-10 package fits the PCB layout constraints. Consider the need for stopwatch functionality or specific alarm configurations before finalizing the design.

Real Time Clock Part Context

The PCF85363ATL/AX belongs to the NXP PCF85363A series of real-time clocks. It is the tape-and-reel version of the PCF85363ATL/A, housed in a DFN2626-10 package. This series is designed for low-power consumer and industrial applications where accurate timekeeping and data retention during power outages are critical.

Real Time Clock Replacement Considerations

According to Discontinuation Notice 202104010DN, the drop-in replacement for the PCF85363ATT1/A variant is PCF85363ATT1/AZ. For the TL package, verify direct compatibility or consult NXP for equivalent solutions if the DFN2626-10 package becomes unavailable.