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Logic Families and Their Characteristics
What is the difference between the 74HC00 series and the 74HCT00 series of CMOS logic?
The HCT series is faster.
The HCT series is slower.
The HCT series is input and output voltage compatible with TTL.
The HCT series is not input and output voltage compatible with TTL.
Correct Answer:
The HCT series is input and output voltage compatible with TTL.
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Logic Families and Their Characteristics
The word "interfacing" as applied to digital electronics usually means:
The problem of different current requirements when CMOS logic circuits are driving TTL logic circuits can usually be overcome by the addition of:
What is the major advantage of ECL logic?
Interfacing (74HCMOS to 74ALSTTl or 74TTL to 74LSTTL) can be done with no danger.
The AND is the simplest of the gates, requiring the least amount of circuitry to implement in TTL.
Propagation delay in TTL is due to slow switching speeds.
A pulse is not perfectly square; it takes time for the digital level to rise from 0 up to 1 and to fall from 1 down to 0.
In TTL the noise margin is between 0.8 V and 0.4 V.
PMOS and NMOS are commonly used for small memories and microprocessors.
In ECL, the HIGH and LOW levels are determined by which transistor in a differential amplifier is conducting more.
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