Arithmetic Logic Unit

ARITHMETIC LOGIC UNIT

Submitted By,

M.GOVINDHASAMY. K.GOWTHAM. K.A.GOWTHAMRAJ.

ARITHMETIC LOGIC UNIT

AIM: To verify the Function table of 4 bit ALU.

APPARATUS REQUIRED:

IC 74181. * Trainer kit(+5v). * Connecting probes.

PROCEDURE:

* Connections are made as shown in the Circuit diagram. * Change the values of the inputs and verify at least 5 functions * given in the function table.
PIN DETAIL & FUNCTION TABLE:-

IC 74181

EXAMPLES:

TRUTH TABLE1:

Kit input | Chip input | A | B | A | B | 0 | 0 | 1 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 1 | 1 | 0 | 0 |

Select lines 0 0 0 0 → A EQU1: A.A=A A→0→0→1 Select lines 0 0 0 1 → AB EQU2: AB→A+B→A+B 0+0=0=1 0+1=1=0 1+0=1=0 1+1=1=0

Select lines 0 1 0 0 → A⊕B
EQU3: A⊕B → A.B+A.B→A.B+A.B 0.0+1.1=1=0 0.1+1.0=0=1 1.0+0.1=0=1 1.1+0.0=1=0
CARRY=LOW MODE=HIGH

TRUTH TABLE2:

Kit input | Chip input | A | B | A | B | 0 | 0 | 1 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 1 | 1 | 0 | 0 |

Select lines 0 0 0 0 → A EQU1: A→1→1→0