ST offers a wide portfolio of real-time clock (RTC) ICs with parallel or serial interface, including ultra-low-power devices packaged in standard SMD SOX18 and SOX28 with embedded ±5ppm 32kHz factory-calibrated 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 and anti-tamper for secure applications.
Applications
Real-time clock (RTC) ICs can be used on a broad range of applications.
Product types
Advanced RTC ICs include additional features such as programmable alarms, watchdog timers, system reset outputs and battery-low warning flags.
Benefits
Along with ST’s serial and parallel RTC portfolio, ST's unique 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 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".
- Integrated switchover
- Long time retention with capacitor backup
- Embedded crystal
- Low standby current
- Analog and digital calibration
- Analog and digital calibration
- Embedded crystal with factory calibration
- NVRAM for retention of configuration data
- Tamper detection
- Replaceable battery and crystal
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)".
