D-6 Flashcards

1
Q

How to “DeMorganize”

A

Change the operator

Negate all the gate’s inputs and outputs

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2
Q

Boolean algebra assumes that variables are either

A

on or off

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3
Q

All flip-flops have ___________________ outputs

A

complementary

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4
Q

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

A

Reset and set

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5
Q

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

A

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

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6
Q

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

A

R and S = 0

making Q and bar Q = high

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7
Q

Describe an asynchronous flip-flop

A

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

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8
Q

Three types of synchronous flip-flops are

A

Clocked R-S FF

D type FF

J-K FF

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9
Q

Describe a synchronous FF

A

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

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10
Q

D type FF is a

A

leading-edge triggered FF

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11
Q

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

A

possesses a unique toggle feature

can be adapted to any of the other three FF

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12
Q

Many J-K FF use __________________ triggering

A

trailing-edge

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13
Q

In input state will a J-K FF toggle?

A

When J and K = 1

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14
Q

What is the formal term for flip-flop

A

Bistable multivibrator

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15
Q

List the four common FF

A

R-S Latch FF

D (data) FF

J-K FF

Clocked R-S

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16
Q

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

A

J-K or D type FF

17
Q

What is meant by the modulus of a counter?

A

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

18
Q

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

A

Rotary selector switch

19
Q

List 5 advantages ICs have over discrete ccts

A
  1. High reliability
  2. Small size
  3. Low cost
  4. High speed
  5. Less power consumed
20
Q

What are the disadvantages of ICs?

A
  1. Current and voltage must be low
  2. Limited component selection
  3. Non-repairable
21
Q

A common way to classify an IC is either

A
  1. Digital (sometimes called logic)
  2. Linear (sometimes called analogue)
22
Q

List the four levels of integration for IC

A
  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
23
Q

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

A

bipolar transistors

24
Q

The CMOS logic family uses

A

field-effect transistor (FETS)

25
A CMOS logic chip is susceptible to being wrecked by
static electricity
26
What does DIP stand for?
Dual-in-package
27
In a TTL chip a floating input behaves as a
high
28
In a CMOS chip a floating input can cause
1. unpredictable output 2. may create excessive heating
29
How to handle floating inputs for AND and NAND gates
may be connected directly to the supply voltage or to one of the used inputs
30
In a DIP, where is the highest pin number located relative to pin #1
directly opposite
31
Which two of the logic families have the faster switching speed
TTL
32