Technical datasheet for the EPSON RTC-58321/58323 CMOS real-time clock module featuring a built-in quartz resonator, perpetual calendar, and low power…
The EPSON RTC-58321/58323 is a CMOS real-time clock module developed for microcomputer applications. It features a built-in 32.768 kHz quartz resonator and provides clock and calendar registers for year, month, day, day-of-week, hours, minutes, and seconds. The module supports both 12-hour and 24-hour time formats with automatic leap-year correction and software selection for local calendars. As a CMOS device, it is designed for very low power consumption, making it suitable for battery back-up purposes.
| Power supply voltage | 4.5 to 5.5 V |
|---|---|
| Operating temperature (RTC-58321) | -10 to +70 °C |
| Frequency tolerance | ± 50 ppm |
| Aging | ± 5 ppm/y |
| Oscillation start time | 1.5 to 3.0 sec |
| Current consumption (VDD = 5V) | 100 to 500 µA |
| Current consumption (VDD = 3V) | 7 to 20 µA |
The module has a built-in 32.768 kHz quartz resonator.
Yes, it provides automatic leap-year correction with software selection for local calendars.
The output is selectable for 1024 Hz, or 1 second, 1 minute, or 1 hour intervals.