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To study of 2-bit magnitude comparator using basic gates.

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Apparatus required:-The following electronics components are required.

  • AND Gate (IC-7408)
  • OR Gate (IC-7432)
  • NOT Gate (IC-7404)
  • EX-OR Gate (IC-7486)
  • IC-7485
  • Digital IC Trainer KIT
  • Connecting wires
Description:-
The comparison of two numbers is an operator that determines one number is greater than, less than (or) equal to the other number. A magnitude comparator is a combinational circuit that compares two numbers A and B and determines their relative magnitude. The outcome of the comparator is specified by three binary variables that indicate whether A>B, A=B (or) A

A = A3 A2 A1 A0

B = B3 B2 B1 B0

The equality of the two numbers and B is displayed in a combinational circuit designated by the symbol (A=B).

This indicates A greater than B, then inspect the relative magnitude of pairs of significant digits starting from most significant position. A is 0 and that of B is 0.

We have A

A>B = A3B31+X3A2B21+X3X2A1B11+X3X2X1A0B01

A3
1B3 + X3A21B2 + X3X2A11B1 + X3X2X1A01B0
The same circuit can be used to compare the relative magnitude of two BCD digits.

Where, A = B is expanded as,

A = B = (A3 + B3) (A2 + B2) (A1 + B1) (A0 + B0)
Symbol:-


Pin-diagram of IC 7485:-


Truth-table for comparator:-


Procedure to Perform:-

  • Take Digital Trainer KIT including Breadboard, ICs and connecting leads (wires).
  • Insert ICs on the Breadboard.
  • According to pin configuration of IC perform the connections.
  • Connect VCC (+5V) to pin no.14 and Connect Pin no. 7 to GND of IC.
  • Apply different input and observe output at LED.
  • Verify the output according truth-table.
Conclusion: - All the output verified the result of Truth Table.
Precaution in lab:- 

  • All the connections should be tight and proper. 
  • Handle the ICs carefully. 
  • Check the connection once again before Switching on the Digital Trainer KIT. 
  • Switch of the Trainer Kit after performing the Experiment.

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