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48 Cards in this Set
- Front
- Back
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3-33E1
What is the voltage range considered to be valid logic low input in a TTL device operating at 5 volts? |
Zero to 0.8 volts
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3-33E2
What is the voltage range considered to be a valid logic high input in a TTL device operating at 5.0 volts? |
2.0 to 5.5 volts
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3-33E3
What is the common power supply voltage for TTL series integrated circuits? |
5 volts
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3-33E4
TTL inputs left open develop what logic state? |
A high-logic state
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3-33E5
Which of the following instruments would be best for checking a TTL logic circuit? |
Logic probe
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3-33E6
What do the initials TTL stand for? |
Transistor-transistor logic
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3-34E1
What is a characteristic of an AND gate? |
Produces a logic “1” at its output only if all inputs are logic “1”
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3-34E2
What is a characteristic of a NAND gate? |
Produces a logic “0” at its output only when all inputs are logic “1”
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3-34E3
What is a characteristic of an OR gate? |
Produces a logic “1” at its output if any input is logic “1”
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3-34E4
What is a characteristic of a NOR gate? |
Produces a logic “0” at its output if any or all inputs are logic “1”
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3-34E5
What is a characteristic of a NOT gate? |
Produces a logic “0” at its output when the input is logic “1” and vice versa
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3-34E6
Which of the following logic gates will provide an active high out when both inputs are active high? |
AND
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3-35E1
In a negative-logic circuit, what level is used to represent a logic 0? |
High level
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3-35E2
For the logic input levels shown in Figure 3E12, what are the logic levels of test points A, B and C in this circuit? (Assume positive logic.) |
A is low, B is high and C is high
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3-35E3
For the logic input levels given in Figure 3E13, what are the logic levels of test points A, B and C in this circuit? (Assume positive logic.) |
A is high, B is high and C is high
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3-35E4
In a positive-logic circuit, what level is used to represent a logic 1? |
High level
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3-35E5
Given the input levels shown in Figure 3E14 and assuming positive logic devices, what would the output be? |
A is low, B is high and C is high
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3-35E6
What is a truth table? |
A list of input combinations and their corresponding outputs that characterizes a digital device’s function.
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3-36E1
A flip-flop circuit is a binary logic element with how many stable states? |
2
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3-36E2
What is a flip-flop circuit? A binary sequential logic element with ___stable states. |
2
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3-36E3
How many flip-flops are required to divide a signal frequency by 4? |
2
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3-36E4
How many bits of information can be stored in a single flip-flop circuit? |
1
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3-36E5
How many R-S flip-flops would be required to construct an 8 bit storage register? |
8
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3-36E6
An R-S flip-flop is capable of doing all of the following except: |
Operate in toggle mode with R-S inputs held constant and CLK initiated
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3-37E1
The frequency of an AC signal can be divided electronically by what type of digital circuit? |
B. Bistable multivibrator
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3-37E2
What is an astable multivibrator? |
A circuit that alternates between two unstable states
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3-37E3
What is a monostable multivibrator? |
A circuit that can be switched momentarily to the opposite binary state and then returns after a set time to its original state.
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3-37E4
What is a bistable multivibrator circuit commonly named? |
Flip-flop
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3-37E5
What is a bistable multivibrator circuit? |
Flip-flop
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3-37E6
What wave form would appear on the voltage outputs at the collectors of an astable, multivibrator, common-emitter stage? |
Square wave
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3-38E1
What is the name of the semiconductor memory IC whose digital data can be written or read, and whose memory word address can be accessed randomly? |
RAM – Random-Access Memory
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3-38E2
What is the name of the semiconductor IC that has a fixed pattern of digital data stored in its memory matrix? |
ROM – Read-Only Memory
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3-38E3
What does the term “IO” mean within a microprocessor system? |
Input-output
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3-38E4
What is the name for a microprocessor’s sequence of commands and instructions? |
Program
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3-38E5
How many individual memory cells would be contained in a memory IC that has 4 data bus input/output pins and 4 address pins for connection to the address bus? |
64
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3-38E6
What is the name of the random-accessed semiconductor memory IC that must be refreshed periodically to maintain reliable data storage in its memory matrix? |
DRAM – Dynamic Random-Access Memory
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3-39E1
In a microprocessor-controlled two-way radio, a “watchdog” timer: |
Verifies that the microprocessor is executing the program
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3-39E2
What does the term “DAC” refer to in a microprocessor circuit? |
Digital to analog converter
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3-39E3
Which of the following is not part of a MCU processor? |
Voltage Regulator
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3-39E4
What portion of a microprocessor circuit is the pulse generator? |
Clock
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3-39E5
In a microprocessor, what is the meaning of the term “ALU”? |
Arithmetical logic unit
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3-39E6
What circuit interconnects the microprocessor with the memory and input/output system? |
Data bus line
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3-40E1
What is the purpose of a prescaler circuit? |
Divides an HF signal so that a low-frequency counter can display the operating frequency
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3-40E2
What does the term “BCD” mean? |
Binary coded decimal
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3-40E3
What is the function of a decade counter digital IC? |
Produce one output pulse for every ten input pulses
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3-40E4
What integrated circuit device converts an analog signal to a digital signal? |
ADC
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3-40E5
What integrated circuit device converts digital signals to analog signals? |
DAC
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3-40E6
In binary numbers, how would you note the quantity TWO? |
0010
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