SPLD nomenclature — meaning of “16H8” An SPLD (e.g., PAL/GAL) listed as 16H8 most likely indicates which output polarity characteristic?

Introduction / Context:
Older SPLD parts (PALs/GALs) often use letter codes to denote output behavior and resources. For instance, R, L, and H letters can indicate Registered outputs, active-Low outputs, or active-High outputs, respectively. Understanding these codes helps interpret datasheets and choose pin-compatible replacements.

Given Data / Assumptions:

• Device code format “16H8”.
• “16” typically refers to available input terms; “8” refers to the number of outputs.
• Letter “H” indicates a polarity characteristic of the outputs.

Concept / Approach:
Historically, families such as PAL16L8 (L = active-Low outputs), PAL16H8 (H = active-High outputs), and PAL16R8 (R = registered outputs) follow a naming convention where the letter conveys output style. Therefore, “H” denotes active-High outputs for that device variant.

Step-by-Step Reasoning:

Verification / Alternative check:
Check part tables listing PAL16H8 vs PAL16L8. The latter explicitly states active-Low outputs, while the former specifies active-High, confirming the polarity implication of the letter code.

Why Other Options Are Wrong:

• active-LOW outputs: would be “L” variant.
• variable-level / tristate-only: not standard SPLD naming implications.
• latches at the outputs: would be indicated by other letters or specific part numbers; “R” generally denotes registered outputs (flip-flops), not latches.

Common Pitfalls:

• Assuming all PAL/GAL codes are identical across vendors; always confirm in the specific datasheet.

Final Answer:
active-HIGH outputs