Flip-Flop Applications
What is the simplest application of a flip-flop?
Event Detect
What is the difference between synchronous and asynchronous counters?
synchronous counters have one external clock into each CLK, asynchronous have one clock into the first CLK and then they cascade into the others
What are the advantages of Synchronous Counters over Asynchronous Counters?
There is no ripple effect.
What is a state machine?
A synchronous sequential circuit, consisting of a sequential logic section and a combinational logic section, whose outputs and internal flip-flops progress through a predictable sequence of states in response to a clock and other input signals.
What is an example of a shift register in real life?
calculator screen
What is the ripple effect?
As the clock input “ripples” from the first flip-flop to the last, the propagation delays from the flip-flops accumulate
What are the advantages of implementing a synchronous counter with the 74LS163 integrated circuit versus using discrete flip-flops and gates?
It is packaged into one gate so it is easier to use and less expensive.
What is an example of a state machine?
traffic lights, numeric keypads, vending machines
What are other devices than a security system might use an event detector?
Alarm Clocks
Car Door Alarms (Keys are still in ignition)
How do you determine the range of a counter?
# bits (#flip-flops)
74LS193
What is the purpose of the C's on a state machine graph?
to display the output signal on probes
How do you determine the sequence a shift register is designed to detect?
Look at the combinational logic in the bottom right and track back to the D-Flip-Flop Outputs.
What is the MSI IC used for an asynchronous counter?
74LS93
What does a 74LS163 do?
Why are there 2 rows for each state on a state machine transition table?
To account for the state and transitioning between states
List two additional applications of the flip-flop aside from a shift register and event detect.
Data Synchronizer
Frequency Divider
Draw a 3 bit down counter using D-Flip Flops.
MS. EPPERSON WILL DRAW
How do you determine the pre-loaded number in a 74LS193?
Read the binary from D to A
If Ms. Epperson's last four digits of her number are 7304, what is the C2 in state 1?
0