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PCF8563T/F4,118

PCF8563T/F4,118

NXP Semiconductors
Real Time Clock ULTRA LO PWR CLK/CAL RTC IC
NRND50,708 in stock
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Overview

The PCF8563T/F4,118 is a CMOS Real-Time Clock (RTC) and calendar optimized for very low power consumption. It provides year, month, day, weekday, hours, minutes, and seconds information over an I2C-bus interface. The device features a built-in timer, alarm functions, and an open-drain interrupt output for system wake-up events.

Why Choose This Part

This RTC offers an extremely low timekeeping current of 0.6uA to 0.75uA, significantly extending the life of backup batteries. It supports a wide operating voltage range from 1V to 5.5V and includes an integrated oscillator capacitor to reduce external component count and PCB footprint.

Applications

Electronic Metering
Used in utility meters to provide accurate time-stamping for energy usage data with minimal battery impact.
Mobile Telephony
Maintains system time in handheld devices when the primary application processor is in deep sleep.
Portable Instrumentation
Ideal for data logging equipment that requires long-term operation from a small coin cell battery.
Battery Powered Products
Serves as a reliable time base for any power-constrained device needing wake-up intervals and calendar tracking.

Key Specifications

Type Clock/Calendar
Features Alarm, Leap Year, Watchdog Timer
Interface I2C, 2-Wire Serial
Date Format YY-MM-DD-dd
Time Format HH:MM:SS (24 hr)
Mounting Type Surface Mount
Package / Case 8-SOIC (0.154", 3.90mm Width)
Voltage - Supply 1V ~ 5.5V
Operating Temperature -40degC ~ 85degC
Supplier Device Package 8-SO
Current - Timekeeping (Max) 0.6uA ~ 0.75uA @ 2V ~ 5V

Getting Started

To implement this RTC, connect the SDA and SCL pins to a microcontroller's I2C bus with appropriate pull-up resistors. Use a 32.768 kHz quartz crystal across the OSCI and OSCO pins. Software integration involves reading and writing to the internal registers to set time or configure the alarm and watchdog timer functions.

Also Consider

DS1307 Analog Devices / Maxim Integrated - A widely used 5V RTC with 56 bytes of NV RAM, though it lacks the ultra-low voltage operation of the PCF8563.
DS3231 Analog Devices / Maxim Integrated - Offers significantly higher accuracy due to an integrated temperature-compensated crystal oscillator (TCXO).
MCP7940M MCHPMicrochip Technology - A cost-effective I2C RTC alternative with digital trimming for clock frequency calibration.