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Title: Digital Electronics Latches
Description: easy and organised notes about latches and how to implement them and their applications
Description: easy and organised notes about latches and how to implement them and their applications
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EMT 125/3
DIGITAL ELECTRONIC PRINCIPLES
INTRODUCTION TO
SEQUENTIAL LOGIC CIRCUIT
SITI ZARINA BINTI MD NAZIRI | SCHOOL OF MICROELECTRONIC ENGINEERING | UniMAP
Sequential Logic Circuit
Describe and explain Latches, Gated Latches
and Edge triggered flip flops characteristic
...
Explain and demonstrate the applications of
flip flops
...
Latches are bistable devices whose state normally
depend on asynchronous input
...
Introduction (cont
...
Flip-Flop:
The output of a flip-flop also depends on current inputs and its
previous output but the change of state occurs at specific times
determined by a clock input
...
Latches
A type of temporary storage device that has two stable (bi-stable)
states
...
S-R latch, Gated/Enabled S-R latch and Gated D latch
...
, active high input SR latch – form with 2cross-coupled NOR gates
...
, active low input SR latch – form with 2cross-coupled NAND
gates
...
Output of latch always complement of each others:
-when Q is high, Q’ is low
...
Latches
Latches:
S-R Latch(active high input & active low input)
Gated S-R Latch
Gated D Latch
S-R Latch (Set-Reset Latch)
Active HIGH S-R Latch
Logic Diagram
S
R Q
Q
0
0
0 NC
1 0
NC
1
No change
Reset state
1
0 1
0
Set state
1
1 0
0
Undefined
Function table
Two Logic Symbols
Active LOW S-R Latch
Logic Diagram
S
R Q
Q
0
0
0 NC
1 1
NC
0
No change
Set State
1
0 0
1
Reset state
1
1 1
1
Undefined
Function table
Two Logic Symbols
S-R Latch (cont…)
Example 1:
If S’ and R’ waveform is applied to the input of latch in
given figures, determine the waveform that will be observed
on the Q output
...
S-R Latch (cont…)
Answer 1:
Gated S-R Latch
Logic Diagram
EN
S
R
Q
Q
0
1
X
0
X
0
Q
Q
Q’
Q’
No change
No change
1
1
0
1
1
0
0
1
1
0
Reset state
Set state
1
1
1
1
1
Undefined
Function table
EN
EN
Two Logic Symbols
Gated S-R Latch (cont…)
Example 2:
Determine the Q output waveform if the inputs shown are
applied to Gated S-R Latch that is initially RESET
...
Gated D Latch (cont…)
Answer:
Title: Digital Electronics Latches
Description: easy and organised notes about latches and how to implement them and their applications
Description: easy and organised notes about latches and how to implement them and their applications