Logics 9: Latches and Flip Flops Flashcards
It is a type of temporary storage device that has two stable states and is normally placed in a category separate from that of flip-flops
Latch
It means having two stable states
Bistable
Is the simplest for of latches
Set-Reset (SR) Latch
In an SR Latch, what is Q when S is 1 and R is 0?
1
In an SR Latch, what is Q when S is 0 and R is 1?
0
Are synchronous bistable devices
Flip-flops
Another name for flip-flops
Bistable Multivibrators
Are flip-flops edge-triggered or level-triggered?
edge-triggered
Are latches edge-triggered or level-triggered?
level-triggered
What value for S and R will an SR flip-flop be invalid?
S=R=1
What happens to Q if J=K=1 in a JK flip-flop
Toggles
What happens to Q if J=K=0 in a JK flip-flop
No Change
Is the interval of time required after an input signal has been applied for the resulting output change to occur
Propagation Delay Time
It is the minimum interval required for the logic levels to be maintained constantly on the inputs
Set-up Time
It is the minimum interval required for the logic levels to remain on the inputs
Hold Time
Is the highest rate at which a flip-flop can be reliably triggered
Maximum Clock Frequency
It is the total power consumption of the device
Power Dissipation
Are circuits whose outputs depends on the sequence of inputs applied and are analyzed with respect to time
Sequential Logic Circuits
The reference of sequential circuit operation
Clock
The output will remain in its present state until some input change is described
Stable State
The output will change logic state after a given time, even if the inputs remain unchanged
Unstable State
The process of connecting the output of the device to the input of the same device
Feedback
The truth table used to analyze sequential circuits
State Table
The time it takes the output of the device to respond to change in the inputs of the device
Propagation Delay
A sequential circuit with one stable and one unstable state
Monostable Multivibrator
The time that the one shot is in its unstable state
Pulse Width
Also known as oscillator
Astable Multivibrator
A sequential circuit with no stable state
Astable Multivibrator
A linear IC capable of producing various types of oscillation timing waveforms and other digital waveform
555 Timer IC
A type of circuit that causes a logic device to switch logic states abruptly at a specific input voltage
Schmitt Trigger Devices
Sequential circuits with two stable states
Bistable Multivibrator
A memory device capable of storing 1 bit of information
Latch
Also known as a delay latch
D Latch
A memory device capable of storing 1 bit of information
Flip-flops
A flip-flop with no invalid state
JK Flip-flop
Forces output to be high in flip-flop asynchronous inputs
PRE
Forces output to be low in flip-flop asynchronous inputs
CLR
A flip-flop circuit that is pulse triggered
Master-Slave Flip-Flop
Is a device that generates binary number in a specified count sequence
Digital Counter
The total number of states or values generated by the counter as it progresses through its specified count sequence
Count Modulus
Counters with modulus of 10 and also known as MOD 10 counters
Decade Counter
Counters with n bits that are also known as modulus of 2^n
Binary Counter
The incoming clock signal of this is routed into the first stage of the counter which generates the LSB of the numbers in the count sequence
Asynchronous Counters
It is constructed with one common clock signal as the input to all the flip-flops simultaneously
Synchronous Counters
A special class of synchronous counter circuit designed from cascaded D flip-flops
Ring Counterss
Produce but patterns that shifts through all counter stages
Ring Counters
It cycles a single logic-HIGH output pulse through the stages of the counter
Basic Ring Counter
It is also known as switch tail counter, Johnson counter, or moebus counter
Twisted Ring Counter
It generates a count sequence where only one output changes between consecutive count states
Twisted Ring Counter
