2. WHAT ARE LOGIC GATES?
The Logic Gate is the simplest
integrated circuit (IC). They are
called logic gates because the circuits
act like gates in a fence.
The gate is either open or closed
depending on the conditions set.
3. THE BASIC LOGIC GATES
AND : acts in the same
way as two switches are
placed in series.
X equals A and B
X= A.B
OR: operates like a
circuit with two
switches placed in
parallel.
X equals A or B
X= A+B
NOT: acts in the same way
as a transistor. It is an
INVERTER.
A with a bar is read as Not A
4. LOGIC GATES consist of diodes, transistors
and resistors assembled in a silicon chip.
5. LOGIC GATES SYMBOL AND TRUTH TABLES
At any given time, every terminal may have an input
or output of 1(high) or 0 (low). In most logic
gates, the low state is approx. 0 volt, while the
high state is 5 volts or 6 volts in some.
6. Take Note:
The inputs and outputs of logic gates are either 1
or 0 which stands for Yes or No; True or False; or
high or low voltages respectively.
7. OTHER TYPES OF LOGIC GATES
These are the simplest combination gates
derived from the basic logic gates.
NAND gate is a combination
of AND and NOT gate.
NOR gate is an OR and
NOT gate combination.