74LS/74HC family pinout knowledge — 7432 quad 2-input OR In the standard 7432 (quad 2-input OR) IC, identify the set of pin numbers that are the four OR gate outputs, according to the conventional DIP pinout.

Difficulty: Easy

Correct Answer: 3, 6, 8, and 11

Explanation:


Introduction / Context:
Recognizing standard TTL/CMOS logic IC pinouts is practical for wiring, testing, and debugging. The 7432 contains four independent 2-input OR gates. Each gate has two input pins and one output pin. Correctly identifying outputs avoids wiring errors and simplifies troubleshooting with a logic probe.


Given Data / Assumptions:

  • Device: 7432, quad 2-input OR.
  • Assume conventional 14-pin DIP package with VCC on pin 14 and GND on pin 7.


Concept / Approach:
In many 74xx quad-gate devices, outputs are located at positions 3, 6, 8, and 11 (mirrored across the package centerline), while inputs are adjacent pins. This consistency helps memorization across related parts like 7408 (AND), 7432 (OR), and 7400 (NAND) with similar output placements.


Step-by-Step Solution:

Recall the standard pinout mapping for 7432.Identify the four output pins: 3, 6, 8, 11.Confirm that pin 14 is VCC and pin 7 is GND, leaving outputs at the stated pins.Therefore, select 3, 6, 8, and 11.


Verification / Alternative check:
Cross-compare with 7408 and 7400 families: these often share output positions 3, 6, 8, 11, reinforcing the memory pattern for quad logic ICs in DIP-14 packages.


Why Other Options Are Wrong:

  • 3, 6, 10, 13 or 1, 4, 10, 13 or 1, 4, 8, 11: These sets include pins typically used as inputs or rails; they do not match the known output positions for the 7432.


Common Pitfalls:
Swapping inputs and outputs, or confusing pinouts across different packages or manufacturers. Always confirm with the specific datasheet when in doubt.


Final Answer:
3, 6, 8, and 11

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