Digital Electronics - Logic Gates - Discussion

Ic 7451 is a 14 pin IC, pin 7 is GND & pin 14 is Vcc. So here vcc is applied then ic is in on state & now the 2 and gates have 1, 2, 4, 5 as inputs &6 as output pin & another gate has 13, 12, 10, 9 as inputs and 8 as output.

Here given that;

1-on, 2-changing, 4, 5 -on, so output pin 6 depends on only input 2.

10th pin is in the off state so we can get 8 pin always off, by this we can say that there is no need to change the conditions all are correct.

@Ganga.

What about pin number 3 and 11?

Please explain it briefly.

IC 7421 is 4 input single output dual AND gate ic.

Pin no 1, 2, 4 & 5 are inputs to the first AND gate. output is pin no: 6.

So first AND gate output is pulsing because(logic 1 AND pulsing AND logic 1 AND logic 1).

Pin no 14 is power supply to the ic, pin no 13, 12, 10 & 9 are inputs to the second AND gate. Output is pin no: 8.

So second AND gate output is OFF or logic 0 because(logic 1 AND logic 1 AND logic 0 AND pulsing).

So overall there is "no problem" in the circuit or IC.

7421 has 4 inputs and the output is and of all.

Pin 6 and 8 are outputs.

As 2 is pulsating output 6 is pulsating but as 10 is of, output 8 is low.

Please explain.

Could anyone explain this.

Please explain.