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Logic Families and Their Characteristics
The problem of different current requirements when CMOS logic circuits are driving TTL logic circuits can usually be overcome by the addition of:
a CMOS inverting bilateral switch between the stages
a TTL tristate inverting buffer between the stages
a CMOS noninverting bilateral switch between the stages
a CMOS buffer or inverting buffer
Correct Answer:
a CMOS buffer or inverting buffer
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Logic Families and Their Characteristics
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.
The basic part numbers of ICs are the same regardless of the manufacturer because digital logic ICs have been standardized.
Schottky logic overcomes the saturation and stored charge problem by placing a Schottky diode across the base-to-collector junction.
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