voltage drop

S

samina

Member

• Mar 11, 2010

• #1

can anyone tell me why the voltage drop or loss occur at different logic gates
for example the input of an And gate was 3.3 v and output was 2.9, why it happened?

 

L

legend killer

Member

• Mar 11, 2010

• #2

Ideally the output should be 5 V.But since you are drawing some current from its output,there is
some voltage drop in the internal resistance.The more current you draw,the less voltage you get

 

M

mneary

New Member

• Mar 12, 2010

• #3

5V is not the ideal output from 3.3V logic.

The rest of the answer is correct; the output will always be some amount less than the power supply due to resistance and other losses.

 

audioguru

Well-Known Member

Most Helpful Member

• Mar 12, 2010

• #4

A Cmos output goes up to the supply voltage when it drives Cmos inputs.
Old TTL outputs have base-emitter and resistor voltage drops at their output.