PCF8564ACX9/1,005

Real Time Clock Overview

The PCF8564ACX9/1,005 is a CMOS real-time clock 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 wide clock operating voltage range of 1.0 V to 5.5 V and a low backup current typical of 250 nA at 3.0 V and 25 °C. Communication occurs via a 400 kHz two-wire I²C interface (operating from 1.8 V to 5.5 V). Additional functions include a programmable clock output, interrupt output, alarm and timer capabilities, a low-voltage detector, and an internal Power-On Reset.

Real Time Clock Feature Summary

• Provides timekeeping based on a 32.768 kHz quartz crystal with BCD-coded registers.
• Wide operating voltage range of 1.0 V to 5.5 V with typical backup current of 250 nA at 3.0 V.
• Supports 400 kHz I²C bus interface and includes a low-voltage detector.
• Features programmable clock outputs (32.768 kHz, 1.024 kHz, 32 Hz, 1 Hz) and alarm/timer functions.

Real Time Clock Applications

• Timing devices including time-of-day tracking and process timing
• Portable instruments
• Electronic metering
• Battery-powered products

Real Time Clock Procurement Notes

Verify the specific package type and revision level against the datasheet before procurement. Confirm that the ordering suffix matches the required delivery form and IC revision. Ensure compatibility with the target system's I²C voltage levels and address configuration.

Real Time Clock Selection Notes

Select this component for applications requiring low-power RTC functionality with a wide supply voltage range. Consider the integrated oscillator capacitors and low-voltage detector for simplified design. Verify that the 400 kHz I²C speed meets system requirements and check if the programmable clock outputs are needed for peripheral synchronization.

Real Time Clock Part Context

The PCF8564A series is designed as a CMOS real-time clock and calendar. It serves as a low-power alternative for timekeeping in battery-operated systems. The device integrates necessary components like the oscillator and capacitors, reducing external part count. It supports standard I²C communication protocols for easy integration with microcontrollers.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers only; omit otherwise.