Logic interfacing Clarifications required

HARI T O1

Dear Team,

I need to interface a Logic gate G1 with another Logic gate G2. Please see the figure below. As per my knowledge, the below conditions should be met.

May I know I am correct or not or missing anything.

Voh(G1)>Vih(G2)
Vol(G1)<Vil(G2)

Ioh(G1)>Iih(G2)
Iol(G1)>Iil(G2)

over 4 years ago

+1 Clemens Ladisch over 4 years ago

Guru 316690 points

These equations are correct.

But note that CMOS inputs have a very high impedance, so the input current is approximately zero. This means that the actual output voltages will be at the rails. In practice, you do not need to check these equations for CMOS devices with the same power supply.

0 HARI T O1 over 4 years ago in reply to Clemens Ladisch

Expert 1645 points

Thank you.

Logic

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Logic interfacing Clarifications required