October 2006
Intermediate to advanced
544 pages
20h 23m
English
Content preview from Digital Systems: Principles and Design
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186
Digital Systems
When we use two multi-emitter junctions of T, one for control input and others for the
input A, the circuit works as tristate input NOT. (Refer inset within the dotted square). When
we use more than two multi-emitter junctions of T, one for control input and others for the
inputs A, B,.., the circuit works as tristate input NAND.
When E = 1, high the output at F will depend on the inputs at the other multi-emitter
junctions of T. When
E
= 0, low the emitter-base junction gets the threshold voltage and
transistor T goes to saturation mode. The output at collector of T is can go high as T is
expected to be operating in cut-off ...
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