ADDER A.I.M. User Manual download pdf (Page 32)

III Sem E&C Engg. LOGIC DESIGN LAB (10ESL38)

Dept. of E&C K.I.T - Tiptur

Octal to Binary conversion using IC 74148:

Truth Table:

Enable Octal inputs Binary outputs

E1 I/P0 I/P1 I/P2 I/P3 I/P4 I/P5 I/P6 I/P7 A2 A1 A0 GS E0

X X X X X X X X X 1 1 1 1 1

0 1 1 1 1 1 1 1 1 1 1 1 1 0

0 X X X X X X X 0 0 0 0 0 1

0 X X X X X X 0 1 0 0 1 0 1

0 X X X X X 0 1 1 0 1 0 0 1

0 X X X X 0 1 1 1 0 1 1 0 1

0 X X X 0 1 1 1 1 1 0 0 0 1

0 X X 0 1 1 1 1 1 1 0 1 0 1

0 X 0 1 1 1 1 1 1 1 1 0 0 1

0 0 1 1 1 1 1 1 1 1 1 1 0 1

Note :

1. Both E0 & Gs are active high when the enable I/P is high.

2. GS : Group signal is active low when any I/P is low

3. E0 : active low when all I/Ps are high.

Procedure:

1. The IC is fixed on the IC zip socket and Vcc & Gnd connections are given from

5V Supply.

2. Connections are made as shown in the Logic diagram.

3. All the inputs are connected to the switches & output to the LEDs.

4. Truth table is verified for different combinations of input.

Result:

Date of Completion of Exp. Staff Signature Remarks

IC 74148

Vcc E0

O\P

Gnd

Inputs

O\P

I/P4

I/P5

I/P6

I/P7

I/P0

I/P1

I/P2

I/P3

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 63 64

IC 74153 18
IC 74139 20
A<B 26
IC 7485 28
IC 74147 31
IC 74148 32
IC 7495 54

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