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8051 supply voltage

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This topic has 3 replies, 4 voices, and was last updated 9 years, 11 months ago by RUBEN KURIAKOSE.

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March 14, 2013 at 10:39 am #2188

Sanda
Participant

just want to know, if I do not have the 5V supply can I use the 9v supply which I have on the 8051 circuit.

March 15, 2013 at 2:05 pm #9322

Savio
Participant

Hey Sanda,

Always refer the device datasheet to know the absolute maximum ratings.

For the AT89c51 MCU the maximum voltage on the VCC pin is 6.6V. But it is better to restrict it to only 5V. Use a 7805 IC if you want to use a 9V source.

March 15, 2013 at 6:47 pm #9323

AJISH ALFRED
Participant

Hi Sanda,

Always try to use 5V with digital ICs including microcontroller.

April 13, 2013 at 10:24 am #9482

RUBEN KURIAKOSE
Participant

You should always use 5v as input. Use a LM7805 voltage regulator for this purpose
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