1
GATE ECE 1994
True or False
+2
-0
In the output stage of a standard TTL, we have a diode between the emitter of the pull up transistor and the collector of the pull-down transistor. The purpose of this diode is to isolate the output node from the power supply $${V_{cc}}$$.
A
TRUE
B
FALSE
2
GATE ECE 1987
MCQ (Single Correct Answer)
+2
-0.6
Given that for a logic family,

$${V_{OH}}$$ is the minimum output high-level voltage
$${V_{OL}}$$ is the minimum output low-level voltage
$${V_{IH}}$$ is the minimum output high-level voltage and
$${V_{IL}}$$ is the minimum output low-level voltage.
The correct relationship is:

A
$${V_{IH}}$$ >$${V_{OH}}$$ >$${V_{IL}}$$ >$${V_{OL}}$$
B
$${V_{OH}}$$ > $${V_{IH}}$$> $${V_{IL}}$$ >$${V_{OL}}$$
C
$${V_{IH}}$$>$${V_{OH}}$$ >$${V_{OL}}$$ >$${V_{IL}}$$
D
$${V_{OH}}$$ > $${V_{IH}}$$>$${V_{OL}}$$ >$${V_{IL}}$$
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