Identify the TTL family class that (in its standard specification) can sink approximately 16 mA at logic low and source on the order of a fraction of a milliamp at logic high—what is this device class commonly called?

Introduction / Context:
Transistor–Transistor Logic (TTL) families differ in speed, power, and I/O drive characteristics. Recognizing typical sink/source capabilities helps with fan-out calculations and interfacing to loads such as LEDs or other inputs.

Given Data / Assumptions:

• Characteristic low-level sink current is roughly 16 mA for the reference family.
• High-level source capability is much smaller (around 0.4 mA or 400 microamps), reflecting TTL asymmetry.
• We refer to classic 74xx TTL specifications.

Concept / Approach:
Classic 'Standard TTL' (74xx) is known for strong sinking at logic 0 and weak sourcing at logic 1. Variants like LS (Low-power Schottky) and S (Schottky) alter speed/power, but the canonical numbers align most closely with Standard TTL expectations.

Step-by-Step Solution:

Verification / Alternative check:
Reference datasheets (e.g., 7400 series) show I_OL near 16 mA and I_OH in the sub-milliamp range, confirming the identification.

Why Other Options Are Wrong:

• Schottky/Low-power/high-power: these modify speed/power trade-offs and typical currents; the given paired values best match Standard TTL.
• None of the above: incorrect because Standard is correct.

Common Pitfalls:
Misreading microamp (µA) as milliamp (mA); assuming symmetric source/sink drive; conflating CMOS output characteristics with TTL.

Final Answer:
Standard