Family resemblance: The GAL16V8 architecture is most similar to which earlier programmable logic device family?

Introduction / Context:
GAL (Generic Array Logic) devices were introduced as reprogrammable, pin-compatible upgrades to popular PAL parts. Recognizing this lineage helps when replacing obsolete PALs in legacy designs.

Given Data / Assumptions:

• Part referenced: GAL16V8.
• PAL devices used a programmable AND array and fixed OR array.
• GALs maintain similar macrocell structures but allow reprogramming.

Concept / Approach:
The GAL16V8 mirrors the PAL16V8’s I/O architecture and macrocell style, enabling drop-in replacement in many circuits. PROMs and PLAs have different internal organizations (PROM: fixed decoder with programmable outputs; PLA: both arrays programmable).

Step-by-Step Solution:

Verification / Alternative check:
Datasheets list PAL-to-GAL migration guidance, including macrocell modes (combinational/registered) and output enable behavior.

Why Other Options Are Wrong:

• PROM: Memory-oriented, different internal structure.
• PLD/SPLD (generic): True categories, but the question asks for the most similar specific family.
• PLA: Both arrays programmable, unlike PAL/GAL pairing.

Common Pitfalls:
Assuming all SPLDs are interchangeable; ignoring pin-compatibility and macrocell mode details when substituting parts.

Final Answer:
PAL