ST offers the widest portfolio of real-time clock (RTC) ICs including ultra-low-power devices, the world’s smallest package with embedded crystal, and ST’s SNAPHAT® with battery and crystal integrated.  It supports SPI and I²C buses.

Supervisory functions include alarm, battery switchover, reset, and special features with time stamp, anti-tamper for secure applications, audio, and trickle charge.

To make designing with real-time clock ICs even easier, ST offers two simulators:

• Battery life calculation allows to evaluate the battery capacity consumption and lifetime of ST's real-time clock ICs
• Clock calibration calculator demonstrates the digital calibration feature of RTC ICs