NXP PCF2129T/2,518 4.2V Clock IC SOIC-16 Package

Its PCF2129T/2‚518 NXP Semiconductor‚ The PCF2129T/2‚518 is a precise RTC with an inbuilt temperature compensated crystal (Xtal) oscillator (TCXO) and a 32.768kHz quartz crystal that has been optimized for excellent accuracy and low power consumption. This has an I2C or SPI bus that may be selected‚ a backup battery switch-over circuit‚ a programmable watchdog function‚ and a timestamp function.

Features:

• Timestamp function with interrupt capability

• 3 Line SPI-bus with separate data input and output

• Battery backup input pin and switch-over circuitry

• Oscillator stop detection function

• Open-drain interrupt output

• Programmable watchdog timer with interrupt