IndiaBIX

Digital Electronics - Integrated-Circuit Logic Families

Exercise : Integrated-Circuit Logic Families - General Questions
26.
What is unique about TTL devices such as the 74S00?
The gate transistors are silicon (S), and the gates therefore have lower values of leakage current.
The S denotes the fact that a single gate is present in the IC rather than the usual package of 2–6 gates.
The S denotes a slow version of the device, which is a consequence of its higher power rating.
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
Explanation:
No answer description is available. Let's discuss.
27.

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

The device is an open-collector AND gate and requires both inputs to be HIGH in order to turn the LED off.
The device is a Schottky AND gate and requires only one low input to turn the LED off.
The device is an open-collector AND gate and requires only one low input to turn the LED off.
The device is a Schottky open-collector AND gate and requires a low on both inputs to turn the LED off.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
28.
Generally, the voltage measured at an unused TTL input would typically be measured between:
1.4 to 1.8 V.
0 to 5 V.
0 to 1.8 V.
0.8 to 5 V.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
The IEEE/ANSI notation of an internal underlined diamond denotes:
totem-pole outputs.
open-collector outputs.
quadrature amplifiers.
tristate buffers.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
The bipolar TTL logic family that was developed to increase switching speed by preventing transistor saturation is:
emitter-coupled logic (ECL).
current-mode logic (CML).
transistor-transistor logic (TTL).
emitter-coupled logic (ECL) and transistor-transistor logic (TTL).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers