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 768khz 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