Tugas 3, Rangkuman Materi Aljabar Boolean
Aljabar Boolean
3. Operasi OR dengan gerbang OR
> X = 1 when A = 1 or B = 1.
Aljabar Boolean adalah alat yang penting
dalam menggambarkan, menganalisa,
merancang, dan mengimplementasikan
rangkaian digital.
1. Konstanta Boolean dan
Variabel.
- Aljabar Boolean dibawah ini hanya mempunyai dua nilai : 0 dan 1.
- Logika 0 dapat dikatakan : false, off, low, no, saklar terbuka.
- Logika 1 dapat dikatakan: true, on, high, yes, saklar tertutup.
- Tiga operasi logika dasar: OR, AND, dan NOT.
- Sebuah tabel kebenaran menggambarkan hubungan antara input dan ouput sebuah rangkaian logika.
- Jumlah The number of entries corresponds to the number of inputs. For example a 2 input table would have 2 2 = 4 entries. A 3 input table would have 2 3 = 8 entries
- Contoh tabel kebenaran dengan masukan 2, 3 dan 4 buah.
3. Operasi OR dengan gerbang OR
- The Boolean expression for the OR operation is X = A + B
> X = 1 when A = 1 or B = 1.
- The OR operation is similar to addition but when A = 1 and B = 1, the OR operation produces 1 + 1 = 1.
- In the Boolean expression
We could say in English that x is true (1) when A is true
(1) OR B is true (1) OR C is true (1).
- There are many examples of applications where an output function is desired when one of multiple inputs is activated.
5. AND Operations with AND gates
- The Boolean expression for the AND operation is X = A • B
x = 1 when A = 1 and B = 1.
- Truth table and circuit symbol for a two input AND gate are shown. Notice the difference between OR and AND gates.
6. Operation With AND Gates
- The AND operation is similar to multiplication.
- In the Boolean expression
X = 1 only when A = 1, B = 1, and C = 1.
7. NOT Operation
- The Boolean expression for the NOT operation is
- This is read as:
> x equals the inverse of A, or
> x equals the complement of A
8. Describing Logic Circuits
Algebraically
- The three basic Boolean operations (OR, AND, NOT) can describe any logic circuit.
- If an expression contains both AND and OR gates the AND operation will be performed first, unless there is a parenthesis in the expression.
- Rules for evaluating a Boolean expression:
> Perform all operations within parenthesis.
> Perform AND operation before an OR operation
unless parenthesis indicate otherwise.
> If an expression has a bar over it, perform the
operations inside the expression and then invert the result.
10. NOR Gates and NAND Gates
- Combine basic AND, OR, and NOT operations.
- The NOR gate is an inverted OR gate. An inversion “bubble” is placed at the output of the OR gate.
- The Boolean expression is, x = A + B
- NAND or NOR gates can be used to create the three basic logic expressions (OR, AND, and INVERT)
- This characteristic provides flexibility and is very useful in logic circuit design.
- The three basic logic functions are AND, OR, and NOT.
- Logic functions allow us to represent a decision process.
> If I get paid AND I go to the bank I will have
money to spend.
PENULIS : Ananda Bagas Pranata (2F)
SUMBER : https://onlinelearning.uhamka.ac.id
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