Integrated-Circuit Logic Families - General Questions

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Integrated-Circuit Logic Families - General Questions

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: Option D

Explanation:

No answer description available for this question.

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: Option B

Explanation:

No answer description available for this question.

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: Option A

Explanation:

No answer description available for this question.

Refer to the figure given below. What type of device is shown and what input levels are required to turn the LED off?

mcq8_1014_1 (1)

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: Option A

Explanation:

No answer description available for this question.

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: Option D

Explanation:

No answer description available for this question.

What does ECL stand for?

A.	It stands for electron-coupled logic; all of the devices used within the gates are N-type transistors.
B.	It stands for emitter-coupled logic; all of the inputs are coupled into the device through the emitters of the input transistors.
C.	It stands for emitter-coupled logic; all of the emitters of the input transistors are connected together and each transistor functions as an emitter follower.
D.	It stands for energy-coupled logic; the input energy is amplified by the input transistors and allows the device to deliver higher output currents.

Answer: Option C

Explanation:

No answer description available for this question.

A logic signal experiences a delay in going through a circuit. The two propagation delay times are defined as:

A.	tPLH and tPHL.
B.	tDLH and tDHL.
C.	tHPL and tlph.
D.	tLDH and tHDL.

Answer: Option A

Explanation:

No answer description available for this question.

What is the increase in switching speed between 74LS series TTL and 74HC/HCT (High-Speed CMOS)?

A.	5
B.	10
C.	50
D.	50

Answer: Option B

Explanation:

No answer description available for this question.

Integrated-Circuit Logic Families - General Questions

Integrated-Circuit Logic Families - General Questions

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