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Preparation

1.

From the data sheets, draw the pin-out diagram for the 74LS00 chip, labeling each pin. Draw the physical truth table from the data sheet, Table 14.

 

Table 14: NAND physical truth table from data sheet.

A	B	X
L	L
L	H
H	L
H	H

 

2.

Define the quantities t_PD(ave), t_PLH, t_PHL. What are the units? From the data sheets, write down or calculate these values (typical and max).

3.

Assemble the circuit of Figure 61 on your breadboard; this can be used to verify NAND operation as well as to measure propagation delay.

4.

Minimise the logic function $F=\overline{A}C + \overline{A}B +A\overline{B}C +BC$. Draw a truth table for F unminimised and minimised and check that they agree. Record your calculations in Table 15. Draw a circuit diagram of the minimised function.

5.

Build a circuit implementing the function $F=\overline{A}C + \overline{A}B +A\overline{B}C +BC$.

 

Table 15: Truth table.

A	B	C	F (unminimised)	F (minimised)
0	0	0
0	0	1
0	1	0
0	1	1
1	0	0
1	0	1
1	1	0
1	1	1

 

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