D-6

Question 1

How to “DeMorganize”

Answer 1

Change the operator

Negate all the gate’s inputs and outputs

Question 2

Boolean algebra assumes that variables are either

Answer 2

on or off

Question 3

All flip-flops have ___________________ outputs

Answer 3

complementary

Question 4

For a R-S flip-flop the R and S stand for

Answer 4

Reset and set

Question 5

For R-S flip-flop what happens when S and R equal 1?

Answer 5

Both Q and bar Q would go low. This is called and illegal, or prohibited condition

Question 6

For NAND gate R-S FF what is the prohibited input?

Answer 6

R and S = 0

making Q and bar Q = high

Question 7

Describe an asynchronous flip-flop

Answer 7

this means the outputs will respond to the R and S input data when that data changes

Question 8

Three types of synchronous flip-flops are

Answer 8

Clocked R-S FF

D type FF

J-K FF

Question 9

Describe a synchronous FF

Answer 9

The data inputs determine what the outputs will be, but the clock inputs determine when the outputs will change.

Question 10

D type FF is a

Answer 10

leading-edge triggered FF

Question 11

J-K FF is the most widely used. Why?

Answer 11

possesses a unique toggle feature

can be adapted to any of the other three FF

Question 12

Many J-K FF use __________________ triggering

Answer 12

trailing-edge

Question 13

In input state will a J-K FF toggle?

Answer 13

When J and K = 1

Question 14

What is the formal term for flip-flop

Answer 14

Bistable multivibrator

Question 15

List the four common FF

Answer 15

R-S Latch FF

D (data) FF

J-K FF

Clocked R-S

Question 16

What devices form the building blocks for counters and shift registers?

Answer 16

J-K or D type FF

Question 17

What is meant by the modulus of a counter?

Answer 17

the number of different states a counter goes through before reset.

Question 18

A multiplexer is the electronic equivalent of what kind of mechanical switch?

Answer 18

Rotary selector switch

Question 19

List 5 advantages ICs have over discrete ccts

Answer 19

1. High reliability
2. Small size
3. Low cost
4. High speed
5. Less power consumed

Question 20

What are the disadvantages of ICs?

Answer 20

1. Current and voltage must be low
2. Limited component selection
3. Non-repairable

Question 21

A common way to classify an IC is either

Answer 21

1. Digital (sometimes called logic)
2. Linear (sometimes called analogue)

Question 22

List the four levels of integration for IC

Answer 22

1. Small-scale integration (SSI) Fewer than 12 gates
2. Medium-scale integration (MSI) 12 to 99 gates
3. Large-scale integration (LSI) 100 to 999 gates
4. Very large-scale integration (VLSI) 10 000 or more gates

Question 23

What type of transistors are used in transistor transitor logic (TTL)

Answer 23

bipolar transistors

Question 24

The CMOS logic family uses

Answer 24

field-effect transistor (FETS)

Question 25

A CMOS logic chip is susceptible to being wrecked by

Answer 25

static electricity

Question 26

What does DIP stand for?

Answer 26

Dual-in-package

Question 27

In a TTL chip a floating input behaves as a

Answer 27

high

Question 28

In a CMOS chip a floating input can cause

Answer 28

1. unpredictable output
2. may create excessive heating

Question 29

How to handle floating inputs for AND and NAND gates

Answer 29

may be connected directly to the supply voltage or to one of the used inputs

Question 30

In a DIP, where is the highest pin number located relative to pin #1

Answer 30

directly opposite

Question 31

Which two of the logic families have the faster switching speed

Answer 31

TTL