TPC 291 Digital Logic Systems Flashcards
In Boolean algebra, all logic functions can be expressed by equations based on three operations _______,________ and _______
AND, OR, NOT
For an AND gate, the output is TRUE if the input A is ________ and the input B is ______.
TRUE; TRUE
A solid-state logic switch must be able to
indicate which state is at its input
The AND function in positive logic is equivalent to the ________ function in negative logic.
OR
If CMOS logic is used in a circuit with TTL logic, the input voltage usually is
5V
An application requests an R-S flip flop that will trigger when S goes HIGH and reset when R goes HIGH. The required flip flop can be made of _______.
Two NOR
The advantage of using an R-S flip flop with a mechanical switch is that the flip flop _______ the output when the switch changes.
Eliminates extra pulses from
The output of a clocked flip flop will change only when the clock pulse is
present
If you need to use a sine wave to control the frequency of a logic clock, you can use a ________ to produce sharp clock pulses
Schmitt trigger
What is the hexadecimal equivalent of the binary numeral 11100
1C
The problem with ripple counters is that the
Propagation delay is cumulative
A device commonly used for converting parallel data to serial data is the
mutiplexer
A half-adder can be made of an _____ gate and an _______ gate.
AND; exclusive OR
Large memories are typically accessed by
matrix addressing
Unlike a RAM a ROM
stores data that do not change
An output interface contains a _______ that produces a _______ signal in response to the output of the logic system.
Transistor; high-voltage
A programmable logic array consists of many _____ that can be connected in various ways by ______.
Logic gates; fusible links
One of the problems with micro processors is that they must perform logic operations ________, and perform them _______.
one by one; in sequence
Seven binary digits in the ASCII code can represent a certain number of alphanumeric characters. How many characters can be represented by a code that uses one more digit?
twice as many
Parallel data transfer is _______ than serial transfer, but serial transfer is ________.
faster; simpler
Intermittent problems in solid state equipment are often cause by
faults in the software
Your first step in troubleshooting a solid-state system should be to
gather information
One of the best ways to speed up troubleshooting in logic circuits is to
follow a troubleshooting tree
A good general practice for localizing trouble in logic systems includes
performing the easy tests first
The best instrument for viewing many logic levels at once is the
logic analyzer
