156. The major advantage of a Schmitt trigger input is that it ________.
(a) avoids erratic triggering
(b) has more triggering methods
(c) has a wider range of outputs
(d) can be retriggered
157. The 74121 nonretriggerable multivibrator can have the output pulse set by a single external component. This component is a(n) ________.
(a) capacitor
(b) inductor
(c) resistor
(d) LED
158. The action of ________ a FF or latch is also called resetting.
(a) breaking
(b) clearing
(c) freeing
(d) changing
159. If an input is activated by a signal transition, it is ________.
(a) hair-triggered
(b) line-triggered
(c) pulse-triggered
(d) edge-triggered
160. The ________ is the time interval immediately following the active transition of the clock signal.
(a) hold time
(b) setup time
(c) over-time
(d) hang-time
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