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Flip Flops-Microprocessors-Assignment, Exercises of Microprocessors

Birla Institute of Technology and ScienceMicroprocessors

Assignment for Microprocessors course. Assigned by Prof. Purumitra Negi at Birla Institute of Technology and Science. It includes: Level, Active, Control, Input, 74HCT373, Trigered, Common, Clock, Signal, Tramission, Edge

Typology: Exercises

2011/2012

Uploaded on 07/31/2012

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Class: Telecom 5.
Assignment # 1.
Question: What is the essential difference between 74AHC74
(D-Flip Flop) and 74HCT373 (D-Latch)? Write one paragraph in
your own words with an example of each is required.
Answer: The essential difference between 74AHC74 (D-FLIP
Flop) and 74HCT373 (D- Latch) is that 74AHC74 (D-Flip Flop) is
“Edge Triggered” however 74HCT373 (D- Latch) is “Level
Triggered”.
The state of a Latch or Flip Flop is switched by a change in the
Control Input. In 74HCT373 (D- Latch) the state of Latch may
keep changing for as long as the clock pulse stays in the Active
level due to the change in input. Thus for whole active region any
change in input appears on output. Hence it is “Level Triggered”
and results in an unpredictable situation (not constant,
continuously changing).
(Positive Level Triggered).
Example: If the clock is in active level and we apply an input
“1” it will appear on the output. At the same time when the clock is
in active level we change the input from “1” to “0”.The output will
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Class: Telecom 5.

Assignment # 1.

Question: What is the essential difference between 74AHC

(D-Flip Flop) and 74HCT373 (D-Latch)? Write one paragraph in your own words with an example of each is required.

Answer: The essential difference between 74AHC74 (D-FLIP

Flop) and 74HCT373 (D- Latch) is that 74AHC74 (D-Flip Flop) is “Edge Triggered” however 74HCT373 (D- Latch) is “Level Triggered”.

The state of a Latch or Flip Flop is switched by a change in the Control Input. In 74HCT373 (D- Latch) the state of Latch may keep changing for as long as the clock pulse stays in the Active level due to the change in input. Thus for whole active region any change in input appears on output. Hence it is “Level Triggered” and results in an unpredictable situation (not constant, continuously changing).

(Positive Level Triggered).

Example: If the clock is in active level and we apply an input

“1” it will appear on the output. At the same time when the clock is in active level we change the input from “1” to “0”.The output will

change and become “0”. Thus the output will not remain constant but it will change frequently as far as the clock is in Active level.

In D-Flip Flop both the control inputs are connected to the “Common Clock”. It Triggers only during a “Signal Transition”. Hence it is “Edge Triggered”.

(Positive Edge Triggered)

(Negative Edge Triggered)

Example: If we apply input „1‟ it will only go to the output at

the edge of the clock pulse either positive or negative. Now if we apply “0” the output will remain unchanged and there will be no effect of the input on output and it will remain “1” unless the next clock edge is arrived. It gives more time to read and process Data.

 Apart from this essential Difference some other important differences between the two are,