er ways for obtaining a D latch. In each case, ify the circuit operation. En D Next state of Q

Electric Motor Control
10th Edition
ISBN:9781133702818
Author:Herman
Publisher:Herman
Chapter22: Sequence Control
Section: Chapter Questions
Problem 6SQ: Draw a symbol for a solid-state logic element AND.
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Show your solutions clearly and systematically.
The D latch of Figure 1 is constructed with four NAND gates and an inverter.
Consider the following three other ways for obtaining a D latch. In each case,
draw the logic diagram and verify the circuit operation.
D
En D
Next state of Q
En
0X
No change
10
11
Q = 0; reset state
Q-1; set state
(a) Logic diagram
(b) Function table.
Figure 1: D Latch
1. Use NOR gates for the SR latch part and AND gates for the other two.
An inverter may be needed.
Q
Transcribed Image Text:Show your solutions clearly and systematically. The D latch of Figure 1 is constructed with four NAND gates and an inverter. Consider the following three other ways for obtaining a D latch. In each case, draw the logic diagram and verify the circuit operation. D En D Next state of Q En 0X No change 10 11 Q = 0; reset state Q-1; set state (a) Logic diagram (b) Function table. Figure 1: D Latch 1. Use NOR gates for the SR latch part and AND gates for the other two. An inverter may be needed. Q
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