PCF85363ATT1/AZ

Real Time Clock Overview

The PCF85363ATT1/AZ 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 communication with a maximum speed 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. Key features include two independent alarms, three timestamp registers triggered by events or battery switch-over, a watchdog timer, and 64 bytes of battery-backed-up RAM. It also functions as a stopwatch for elapsed time counting.

Real Time Clock Feature Summary

• Provides real-time clock/calendar functionality including 100th seconds, with support for both RTC and stopwatch modes.
• Features two independent alarms and three timestamp registers for event logging.
• Includes 64 bytes of battery-backed-up RAM and an integrated watchdog timer.
• Operates at low current (typical 0.28 μA at 3.0 V) with a wide supply voltage range of 0.9 V to 5.5 V.

Real Time Clock Applications

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

Real Time Clock Procurement Notes

Verify the ordering part number PCF85363ATT1/AZ corresponds to the TSSOP10 package variant. Confirm that the Static Shielding Bag (SSB) packing method requirements are met for storage between uses. Ensure the temperature range specification of -40 °C to +85 °C aligns with the application environment.

Real Time Clock Selection Notes

Select this component when high accuracy and low power consumption are required for industrial applications. The integrated oscillator capacitor adjustment allows configuration for various quartz types (CL = 6 pF, 7 pF, or 12.5 pF). Consider the TSSOP10 package if space constraints allow, noting that pin availability for CLK and INTA/CLK varies by package type.

Real Time Clock Part Context

The PCF85363ATT1/AZ belongs to the NXP PCF85363A series of tiny real-time clocks. It serves as a drop-in replacement for the discontinued PCF85363ATT1/A according to discontinuation notice 202104010DN. The device is part of NXP's portfolio of ultra-low-power RTCs designed for long battery life in portable and battery-backed systems.

Real Time Clock Replacement Considerations

The PCF85363ATT1/AZ is the specified drop-in replacement for the PCF85363ATT1/A per PCN 202104008A. Verify compatibility with existing PCB layouts and software drivers, particularly regarding the TSSOP10 package dimensions and pinout.