Examkin

Question

Difficulty: HardIntegrated Circuits

When inspecting a standard 14-pin Dual In-line Package (DIP) integrated circuit with the reference notch oriented at the top, which statement correctly describes the standard pinout numbering convention used to identify pin 1 and pin 14?

  1. A
    Pin 1 is at the top-left beside the notch, and numbering progresses sequentially down the left side from pin 1 to 7, then restarts at the top-right with pin 8 and counts down to pin 14 at the bottom-right.
  2. Pin 1 is at the top-left beside the notch, and numbering progresses counter-clockwise down the left side from pin 1 to 7, across to the bottom-right for pin 8, and up the right side to pin 14 at the top-right.Answer
  3. C
    Pin 1 is at the top-right beside the notch, and numbering progresses clockwise down the right side from pin 1 to 7, across to the bottom-left for pin 8, and up the left side to pin 14 at the top-left.
  4. D
    Pin 1 is at the top-left, and numbering alternates horizontally across opposing pairs (pin 1 top-left, pin 2 top-right, pin 3 second-row left) down the package to pin 14 at the bottom-right.

Answer

Pin 1 is located at the top-left immediately adjacent to the notch, and numbering continues counter-clockwise down the left column (pins 1 through 7) and upward along the right column (pins 8 through 14), placing pin 14 at the top-right directly opposite pin 1.
For all standard Dual In-line Package (DIP) integrated circuits, placing the index notch at the top establishes pin 1 at the top-left. Numbering then advances counter-clockwise down the left row (pins 1 to 7 for a 14-pin IC), transitions across to the bottom-right pin (pin 8), and ascends the right row to pin 14 at the top-right.

Step-by-Step Solution

1
Orient the integrated circuit package correctly.
The reference notch or alignment dot is positioned facing upward (top).
Standardized electronic manufacturing standards (JEDEC) require referencing the orientation marker before indexing lead pins.
2
Identify pin 1 based on the reference notch.
Pin 1 is the lead located immediately to the left of the notch in the top row.
By industry convention, pin 1 is always directly counter-clockwise adjacent to the top reference notch.
3
Trace the indexing sequence around the Dual In-line Package perimeter.
Pins 1 through 7 run down the left side, pin 8 is at the bottom-right, and pins 9 through 14 advance upward on the right side to pin 14 at the top-right.
DIP integrated circuits use a continuous counter-clockwise loop rather than parallel or alternating row numbering.

Key Concept

Dual In-line Package (DIP) Integrated Circuit Pin Numbering Convention
Estimated Time:1m 0s
Rate this question

Topics

Integrated Circuits

More questions from this topic