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RS Flip-Flop, Latch, Sequential Logic
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Flip FlopNugroho Adi Pramono
[email protected],[email protected] http://aravir-rose.blogspot.com/p/digital
“But, before that…”
Real Gate
Interfacing
It must work
It must NOT damage other circuit
How fast?
How much current?
What voltage
Things we may have overlooked
How Fast?
As fast as slowest chip (chip to chip)
How Fast?
Irrelevant (chip to something else)
How much current?
What voltage
Others Things
Switch Bounce
Switch Bounce
Smile or Smoke?
Smile or Smoke?
Smile or Smoke?
Power Supply
Sequential Logic
Combinational Logic
some gates
some inputs
output (with certainty)
Sequential Logic
inputs
gates
previous state
Sequential Logic
tombol televisi
saklar lampu
bel pintu
Switches
Latching
non-Latching
Switches
RS bistable
SR bistable
RS Flip-Flop
SR Flip-Flop
RS Latch
RS bistable
RS bistable
NAND Latch
(1) = 1 (3) = 0 atau 1 tergantung (2)
(5) = 0 (6) = 1 (sifat NAND) (6) — (2)
gate A punya input 1 semua (3) = 0 (4) = 0
Q = 0 (reset) Q’ = 1
S = 1, R = 0
(1) = 0 (3) = 1
(5) = R = 1 (6) = 0
gate B punya input 1 semua (3) — (4) = 1
Q = 1 (set) Q’ = 0
S = 0, R = 1
–Active Low Input
“nol untuk menyalakan”
Dan dia hidup bahagia selama-lamanya...
(1) = 0 (3) = 1
(5) = 0 (6) = 1
Q = 1 Q’ = 1 Forbidden
S = 0, R = 0
S = 1, R = 1
Tak ada yang terjadi
Selesai
Dan dia hidup bahagia selama-lamanya...
