October 2006
Intermediate to advanced
544 pages
20h 23m
English
Content preview from Digital Systems: Principles and Design
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348
Digital Systems
Let the state at Q is idle (rest or steady) state of the switch when a switch is in the
middle. A cross-coupled gated NAND latch at left side of Figure 14.4(a) is now useful for
the debouncing action. In the idle state, the both inputs, R and S are 1, and the output, Q, is
as per table in Figure 14.4(b). The Q is unchanged (stable at 1 or 0). When the switch is
moved up side at first time contact, the R input is 0 while S input is at 1 (being connected to
far of down end of the switch to the supply V
CC
end. For R = 0 and S = 1, the Q becomes 1.
When switch is bouncing that making repeated contacts for a short while. It means S
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