Difficulty: Easy
Correct Answer: Correct
Explanation:
Introduction / Context:
The 74194 class of devices implements a bidirectional universal shift register with serial and parallel paths plus directional control. Such capability allows designers to bridge serial and parallel domains, manipulate data order, and implement compact state machines or counters with minimal glue logic.
Given Data / Assumptions:
Concept / Approach:
With parallel load, data from a bus can be captured and then shifted out serially; conversely, serial data can be shifted in and then presented in parallel. Bidirectional shifting enables MSB-first or LSB-first sequencing as needed. These features underpin wide application: format conversion (PISO/SIPO), time-division serialization, sequence generation, simple counters, and programmable delays.
Step-by-Step Solution:
1) Use parallel load to capture a 4-bit word.2) Select shift direction to serialize MSB-first or LSB-first.3) Chain multiple devices for wider words.4) Employ mode controls to alternate between load and shift phases.
Verification / Alternative check:
Typical application notes show the device in serial/parallel conversion, temporary storage, and small sequence generators.
Why Other Options Are Wrong:
“Incorrect” and claims of 'only ring counter' or 'only serial output' contradict the documented capabilities.
Common Pitfalls:
Ignoring timing (synchronous vs asynchronous load); misinterpreting direction controls; not providing proper chaining for wider widths.
Final Answer:
Correct
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