Lesson 10 Logic and Digital Electronic
Inverter (also called NOT
Gate）
In the digital world,
there are only 0 and 1. There is No 1.3, 1.7, 3 or 4. in digital world.
The function of
inverter is to convert 0 to 1, or convert 1 to 0.
We use higher voltage to
present 1, lower voltage to present 0. The interface voltage is
about 1/2 voltage of the
IC power. (2.25V in our case)
There are 6 inverters in
one 4069 IC.
|
input A |
output Y |
|
0 |
1 |
|
1 |
0 |
AND
Gate Both input A and input B must
be 1 ,then the Y output 1
|
A |
B |
Y |
|
0 |
0 |
0 |
|
0 |
1 |
0 |
|
1 |
0 |
0 |
|
1 |
1 |
1 |
OR
Gate Either input A or input B is 1 , then the Y
output 1
|
A |
B |
Y |
|
0 |
0 |
0 |
|
0 |
1 |
1 |
|
1 |
0 |
1 |
|
1 |
1 |
1 |
NAND Gate
NAND=AND+NOT
|
A |
B |
Y |
|
0 |
0 |
1 |
|
0 |
1 |
1 |
|
1 |
0 |
1 |
|
1 |
1 |
0 |
Experiment 1
NOT gate (Invertor)
Be careful when lift IC from breadboard. The pins of IC is easy to bend. and broken.
You may use a pen to lift IC from IC bottom.
The purpose of R1 is to let the input of inverter to be grounded when
switch is off.
Experiment 2 OR gate
Experiment 3 AND Gate
We use 4.5V for IC Power. So the voltage of input greater then 2.25 will
be signal “1”.
The voltage of input smaller then 2.25 will be signal “
Experiment 4 Fill the true value table before doing
experiment.
Experiment 5 Self-keep circuit
Press S , LED keep shining
Press S and loosen, LED keep shining until press R
Experiment 6 NAND Gate
Experiment 7 Make NOT with NAND
Experiment 8 Make AND with NAND
Experiment 9 make OR with NAND
Experiment 10
From Experiment 7,8,9 we
know that NOT,OR,AND can be replace by NANDs.
So, Experiment 4 may be replaced with the following circuit. We use two ICs in experiment 4. But here
we use one IC (4011) Only.
Experiment 11
Self-keep circuit with 4 NAND
gates. ,
This circuit is equql to
experiment 5 .
Experiment 12
When someone near and in
the darkness then the LED shines automatically
