1.
What advantage does the 74HXX series device have over standard TTL?
A
reduced propagation delay
B
higher propagation delay
C
low power consumption
D
lower voltage requirements
Loading practice questions
74 practice sets · Page 1 of 4
What advantage does the 74HXX series device have over standard TTL?
reduced propagation delay
higher propagation delay
low power consumption
lower voltage requirements
Unused inputs on TTL, AND, and NAND gates
degrade the gates noise immunity.
if left open will have the same effect as HIGH inputs.
should be tied HIGH.
All of the above are correct.
Typical TTL LOW level output voltage is
0.3 V.
0.0 V.
3.4 V.
4.0 V.
Typical TTL HIGH level output voltage is
0.3 V.
5.0 V.
3.4 V.
4.8 V.
The upper transistor of a totem-pole output is saturated when the gate output is
shorted.
HIGH.
logic 0.
LOW.
The upper transistor of a totem-pole output is OFF when the gate output is
logic 1.
malfunctioning.
HIGH.
LOW.
The unused input for a NOR gate should be tied to
HIGH.
ground.
another unused input.
both B and C
The time it takes for an input signal to pass through internal circuitry and generate the appropriate output effect is known as
propagation delay.
rise time.
fan-out.
fall time.
The time it takes for a square wave to go from 90% to 10% of its voltage level is called
rise time.
fan-out.
fall time.
propagation delay.
The time it takes for a square wave to go from 10% to 90% of its voltage level is called
fan-out.
rise time.
propagation delay.
fall time.
The standard 74XX TTL IC family was originally developed in the
1970s.
1960s.
1950s.
1940s.
The propagation delay of standard TTL gates is approximately
2 µsec.
10 nsec.
4 nsec.
1 µsec.
The primary advantage of ECL over TTL is that ECL integrated circuits have
very low power dissipation.
low noise margins.
very short propagation delay times.
both A and C
The output stage of a TTL gate is a special design called a(n)
totem-pole.
DIP.
MSI.
multiemitter.
The output current for a LOW output is called a(n)
exit current.
sink current.
ground current.
fan-out.
The output current capability for a HIGH output condition is called a(n)
source current.
exit current.
sink current.
fan-out.
The original CMOS line of circuits is the
5400 series.
4000 series.
74C00 series.
74HCOO series.
The number of gates that can be connected to a single output without exceeding the current ratings of the gate is called
dissipation.
propagation.
fan-out.
SSI.
The noise margin for a standard TTL gate is
1.0 V.
0.4 V.
1.4 V.
0.8 V.
The minimum output voltage recognized as a HIGH by a TTL gate is
0.8 V.
2.4 V.
5.0 V.
2.0 V.