Terminology for oscillators: An astable multivibrator is sometimes referred to as a clock because it free-runs and produces a continuous train of pulses. Evaluate the statement.
Correct Answer: Correct
Introduction / Context:Many digital systems need a periodic timing reference. An astable multivibrator, whether discrete or IC-based, generates a continuous sequence of pulses without external triggering and is frequently used as a simple clock source.
Given Data / Assumptions:
- Astable = no stable state; the circuit oscillates continuously.
- Output is a periodic waveform (square/rectangular) suitable for driving counters and flip-flops (with level/edge conditioning as needed).
- Frequency determined by component values or internal timing cells.
Concept / Approach:Because it generates pulses at a set frequency, an astable multivibrator serves as a clock for simple applications. More precise systems may use crystal oscillators, PLLs, or clock generator ICs, but the terminology of “clock” for an astable source is common and practical.
Step-by-Step Solution:
Recognize that a “clock” is any periodic timing reference.Astable circuits provide a self-sustaining periodic output.Therefore, an astable multivibrator can function as, and be called, a clock.Hence, the statement is correct.Verification / Alternative check:Classic 555 in astable mode, or two-inverter RC oscillators, are routinely described as clocks in educational and hobbyist circuits.
Why Other Options Are Wrong:
Incorrect: Ignores the defining oscillatory behavior of astable circuits.True only for crystals or monostables: A monostable is trigger-based (not a clock), and crystals are a subset; astables broadly qualify.Common Pitfalls:Assuming “clock” requires crystal accuracy; neglecting buffering/shaping needed to meet logic-level specs for different families.
Final Answer:Correct