ST offers a wide portfolio of real-time clock (RTC) ICs with parallel or serial interface, including ultra-low-power devices and the world’s smallest package with embedded crystal.
Our devices offer many value-added features such as supervisory functions that include alarm, battery switchover, and reset as well as special features with time stamp, anti-tamper for secure applications and an integrated audio section.
ST's SNAPHAT® devices have a special removable/replaceable top that contains a lithium coin-cell battery and a 32-kHz crystal designed to be "snapped on" after the surface mount process. It solves the reflow compatibility of the lithium batteries and provides a solution compatible with all of ST's real-time clocks in surface-mount SOH-28 and SOH-44 packages.
All ST RTCs are Underwriters Laboratories® (UL) Recognized, see application note AN1011 ;"Battery technology used in NVRAM and real-time clock (RTC) products".
Real-Time Clock (RTC) design support
To make designing with real-time clock ICs even easier, ST offers two simulators:
- Battery life calculator evaluates the battery capacity consumption and lifetime of ST's real-time clock ICs
- Clock calibration calculator demonstrates the digital calibration feature of RTC ICs
See also our summary of development hints in application note AN3060;"Application guide for serial real-time clocks (RTCs)"
Real-time clock for demanding wearable devices
ST’s M41T62LC6F real-time clock is the perfect match for wearable devices when size, weight, and power-efficiency matters.
It offers a very low frequency error at 25 °C which equates to about 5 seconds per month, an ultra-low power consumption of 350 nA in standby, and comes in an ultra-small 1.5 x 3.2 mm package with an embedded crystal oscillator.