Hi,You should supply the RTC | Microcontroller › 8051 › rtc power supply microcontroller interfacing › Hi,You should supply the RTC June 17, 2013 at 11:06 am #9972 AJISH ALFREDParticipant Hi, You should supply the RTC chip with the voltage mentioned in its datasheet. If it works on 3.3V then you should supply atleast 3V, if it is 5V then you have to supply atleast 4.5V
