ENS221/CSC 347 Prof. Herb Schanker

Lab 1

Name ________________________

A1. Investigate the behavior of the following ICs. Be sure to analyze each

IC in terms of AND & OR functionality. Draw the two function symbols for

each gate.

IC # Gate Name AND Funtionality OR Funtionality

7400 Nand

7402 Nor

7408 And

7432 Or

A2. Investigate the behavior of the 7404 inverter and the 7486 exclusive

or IC.

A3. The 7486 XOR IC can be used as a controllable inverter, i.e., when

the control input, C, is 0 the output is the second input, x. When

the control input is 1, the output is x . Verify the above property.

B1. Universality of the NAND gate.

Using a single 7400 IC, realize a circuit that produces a) an inverter,

b) 2-input AND, c) 2-input OR, d) 2-input NOR

and e) 2-input XOR (Ed 3, Fig 3-32 or Ed 2, Fig 4-21 Text).

C. Verify that the output of the 7475 bistable latch follows the input as

long as the enable is asserted. Compare this behavior with that of the

7474 D-Type positive edge triggered flip-flop. The 7474 FF also has

SET* and CLEAR* inputs. If these inputs are not to be used, they should

be tied high. Observe the output as you vary these inputs according

to the function table. What happens if both inputs are simultaneously

asserted?