gates remain not only in transistor cutoff but also output stage itself in complete cutoff state?
An alternative way of putting this question is that can a logic gate have three states; 1, 0 and
a tristate. A tristate means high impedance state in which there is no i
source
or i
sink
at the out-
put stage transistor or MOSFET. We shall be learning in this chapter use of tristate gates to
accomplish the output from different gates on a common wire.
8.1OPEN COLLECTOR GATE
Recall the NAND TTL shown in Figure 6.6(a). The T F output pulls up to voltage level V
cc
when the collector of T logic state output is 1. Let us consider an
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