Recognizing edge-triggered flip-flops in schematics: Devices can be identified by a triangle drawn on the clock input. Evaluate this statement.

Introduction / Context:
Schematic symbols carry compact information about device behavior. For flip-flops, knowing how to spot edge-triggered versus level-sensitive devices quickly prevents design errors in synchronous systems.

Given Data / Assumptions:

• A flip-flop is shown with a triangle on the clock input pin.
• Standard schematic conventions are used (ANSI/IEEE/IEC).

Concept / Approach:
The triangle symbol on the clock input indicates that the device responds on an edge (transition). If there is a bubble in addition to the triangle on the clock pin, it indicates a negative-edge (falling-edge) triggered device; without the bubble, it is positive-edge (rising-edge) triggered. Level-sensitive elements typically lack the triangle and often include a gate-enable marking instead.

Step-by-Step Solution:

Verification / Alternative check:
Datasheets for common families (e.g., 74HC74, 74HC76) show the triangle convention. Simulation libraries and schematic templates follow the same rule.

Why Other Options Are Wrong:
Incorrect: Conflicts with standard symbol usage.

Only true for positive-edge devices / TTL only: The triangle convention spans CMOS, TTL, and mixed-signal libraries.

Common Pitfalls:
Confusing active-low asynchronous inputs (PRE/CLR with bubbles) with edge-trigger indicators, or mistaking enable pins for clocks.

Final Answer:
Correct