9S08QG8 family 5V tolerant

[Cram]

Hi all,

Does anybody knows if 9S08QG8 family are 5 V tolerant?
The low Vcc voltage (up to 3.6V) is just a matter of power consumption?

Thxs for any comment

[admin]

Well I see you got an acceptable answer so I guess my reply is immaterial.

Anyway, I was going to say that I thought "5v tolerant" meant that the part was capable of accepting 5v levels on its inputs while operating at some other, lower voltage. But it appears you mean is it capable of actually operating at 5v.

If you run a QG at 3.3v and apply 5v to an input, it won't work. Something will have to give. There are substrate diodes from the I/O pins to the Vdd pin which would be forward biased if you did that.

[peg]

Hello,

For the record the absolute maximum for supply is 3.8 volts and for inputs is supply plus 0.3 volts. So under no circumstances can you apply 5 volts to the input

[celsoken · Accepted solution]

Dear Cram,

Even if you homologate QG8 working on 5V, you'd be working outa specs.

When the next die shrink arrives, you could be in trouble.

Try the SH8, it's quite the same as Qg8, but it works on 5V, with higher pin count, low cost and and it is not hard to find.

Cheers,

Celso

[Cram]

Thx for all,

Yes I found the SH8 family after post the question, yes it pin to pin compatible with a little bit more options, but it will works!

Best rgards,

Cram

[Superberti]

I can confirm that this MCU is working without problems

on 4.0 V, but I did not test it with higher voltages.

Bye,