Epson-Toyocom-Serial-SMT-Real-Time-Clock-Module-with-EEPROM-Epson-Toyocom-Q41970171000101-EEPROM-real-time-clock-module-4-wire-serial-interface-RTC-features-battery-backup-power-500ns-data-setup-time-32-768k Hz-clock-frequency-5-23ppm-frequency-precision-2-7V-to-3-6V-supply-voltage-40-to-85-C-20-VSOJ-case-the-Epson-Toyocom-RTC-9701JE-module-is-a-serial-interface-real-time-clock-that-features-an-onboard-EEPROM-with-4kbit-of-non-volatile-memory-other-features-include-a-built-in-fr