Terminology — a mod-10 counter (counts 0 through 9 repeatedly) is commonly referred to as a ______ counter.

Introduction / Context:
Digital counters are often named by their modulus and by conventional terms. A counter that cycles through ten states (0–9) is encountered in BCD decade divisions and timekeeping. This question asks for the standard common name used for a modulus-10 counter.

Given Data / Assumptions:

• Counter cycles through 10 distinct states per full period.
• Typical application: BCD digit counting for displays or stopwatch seconds.
• We are selecting the widely accepted generic term.

Concept / Approach:
The conventional name for a mod-10 counter is “decade counter.” While many decade counters are indeed used to produce BCD digits (0–9), the umbrella term “decade” describes the modulus itself without implying a specific internal encoding or topology. Other named counters (ring, Johnson) describe different sequence structures and are not inherently mod-10 unless specially configured.

Step-by-Step Solution:

Verification / Alternative check:
Datasheets for classic TTL/CMOS devices (e.g., 74xx90/160/162 families, CD4017) routinely label mod-10 devices as decade counters.

Why Other Options Are Wrong:

• Strobing: Refers to timing technique, not a modulus name.
• Ring: One-hot circulating register; not inherently mod-10.
• Johnson: Twisted-ring with 2N states; not inherently mod-10.

Common Pitfalls:
Assuming “BCD” as a universal synonym; while many decade counters produce BCD, “decade” is the standard generic term for modulus 10.

Final Answer:
Decade.