Exercise: Integrated Circuit Logic Families

Questions for: Integrated Circuit Logic Families

The bipolar TTL logic family that was developed to increase switching speed by preventing transistor saturation is:
A:
emitter-coupled logic (ECL).
B:
current-mode logic (CML).
C:
transistor-transistor logic (TTL).
D:
emitter-coupled logic (ECL) and transistor-transistor logic (TTL).
Answer: D
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The IEEE/ANSI notation of an internal underlined diamond denotes:
A:
totem-pole outputs.
B:
open-collector outputs.
C:
quadrature amplifiers.
D:
tristate buffers.
Answer: B
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Generally, the voltage measured at an unused TTL input would typically be measured between:
A:
1.4 to 1.8 V.
B:
0 to 5 V.
C:
0 to 1.8 V.
D:
0.8 to 5 V.
Answer: A
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Refer to the figure given below. What type of device is shown and what input levels are required to turn the LED off?

A:
The device is an open-collector AND gate and requires both inputs to be HIGH in order to turn the LED off.
B:
The device is a Schottky AND gate and requires only one low input to turn the LED off.
C:
The device is an open-collector AND gate and requires only one low input to turn the LED off.
D:
The device is a Schottky open-collector AND gate and requires a low on both inputs to turn the LED off.
Answer: A
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What is unique about TTL devices such as the 74S00?
A:
The gate transistors are silicon (S), and the gates therefore have lower values of leakage current.
B:
The S denotes the fact that a single gate is present in the IC rather than the usual package of 2–6 gates.
C:
The S denotes a slow version of the device, which is a consequence of its higher power rating.
D:
The devices use Schottky transistors and diodes to prevent them from going into saturation; this results in faster turn on and turn off times, which translates into higher frequency operation.
Answer: D
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