1 pcs : RTC-8564NB:B3:ROHS - Real Time Clock 32.768KHz 3.0Volts -40C +85C

Real Time Clock Modules Epson Real Time Clock Modules are available as Serial-interface, 4-bit, and I2C-Bus interface. -- Simple function 3-wire Serial-interface Real Time Clock Module features a built-in frequency adjusted 32.768 kHz crystal unit with a CMOS output with control pin frequency output function. With a 2.5 V to 5.5 V operating voltage range and a 1.4 V to 5.5V wide timekeeper voltage range, the RTC-4543SA includes full calendar, timer, and low voltage detection. -- 4-bit Real Time Clock Modules offer a built-in crystal unit to allow adjustment-free, efficient operation. The RTC-72421/23 also features a 24 h /12 h changeable and leap year automatically adjustable Gregorian calendar. -- I2C-Bus interface Real Time Clock Module features low current consumption, built in frequency adjusted 32.768 kHz crystal unit with a CMOS output with control pin frequency output function. With a 1.8 V to 5.5 V operating voltage range and a 1.0 V to 5.5 V (-20C to +70C) timekeeper voltage range, the RTC-8564NB includes a full calendar, alarm, timer, and power supply voltage monitoring function.