Real time clock/calendars

NXP Semiconductors offers a number of real time clock/calendars based on 32kHz quartz oscillators. With these products, time keeping is made easy, and alarm, timer, and watch-dog features complement the basic functionality. Extremely low power consumption, down to 250nA, outperforms most RTCs in microcontrollers. This allows you to use the RTC to wake up a microcontroller in hibernation mode for greater power savings.

Our real time clock/calendars are primarily differentiated by their I2C- or SPI-bus interfaces. Additional differences include industrial or extended (up to 125°C) temperature ranges and additional scratch pad RAM. State of the art leadless packages keep the application thickness to a minimum.

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PCA8565 Real time clock/calender with I2C-bus interface

PCA8802 Ultra low power Smartcard RTC with Fm+ I2C-bus interface; ultra low power oscillator with integrated counter for initiating one time password generation

PCF8563 Real time clock/calendar with I2C-bus interface

PCF8564A Real time clock and calendar with I2C-bus interface

PCF8583 Clock/calendar with 240 x 8-bit RAM and I2C-bus interface

PCF8593 Low power clock/calendar with I2C-bus interface

PCA2125 Real time clock/calendar for SPI bus

PCF2123 SPI real time clock/calendar

PCF2127A Integrated RTC, TCXO, and quartz crystal

PCF2128 See PCF2127A replacement Datasheet (Jun 4, 2007) PCF2128T/1 SO-20 Withdrawn SOT163-1                   Family Functions Literature

PCF2129A Integrated RTC, TCXO, and quartz crystal

	PL Interface Products in Set-top Box Applications Solutions Marketing Presentation © May 2009; English; Ordering code: Not Orderable
	Highly accurate RTCs with embedded quartz crystal NXP high-precision RTCs with time stamp and advanced power back-up PCF2127A, PCF2129A © May 2009; English; Ordering code: 9397 750 16659
	NXP Real-time clock sets new record in power efficiency NXP ultra-low-power RTC with electronic frequency tuning PCF2123 © May 2009; English; Ordering code: 9397 750 16658
	System Management Device Overview © January 2009; English; Ordering code: Not Orderable
	Your complete choice for I2C-bus peripherals Our invention, your solution to everyday design challenges © December 2007; English; Ordering code: 9397 750 15669
	Real-time clocks for low power, high temps, or scratch-pad memory NXP real-time clock/calendars with SPI or I2C-bus interfaces PCF2124, PCA2125, PCF8563, PCA8565, and PCF8583 © December 2006; English; Ordering code: 9397 750 15686

• More Literature

• AN10382 Using the RTC Efficiently in the LPC213x, V1 (Jun 6, 2005)
• AN10652 Improved timekeeping accuracy with PCF8563 using external temperature sensor, V1.01 (Nov 2, 2007)
• AN10770 P89LPC9351 Readable RTC (with Software), V1 (Dec 2, 2008)
• AN10849 LPC1700 RTC hardware auto calibration (with software), V1 (Oct 1, 2009)
• I2C Demonstration Board 2005-1 Training Module 7. Real Time Clocks (Oct 2006)
• LH75400/01/10/11 Creating a Real-Time Clock (RTC) with an On-chip Timer and Software (Sep 17, 2007)
• User Manual for NXP Real Time Clocks PCF85x3, PCA8565 and PCF2123, PCA2125, V1 (Dec 23, 2008)

• More Support Documents