Pinout

This module steps you through finding the basic pinout of the device before starting to really dive into the logic.

• Identity pin 1
  • Detail
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  1. Pin A
  2. Pin B
  3. Pin C
  4. Pin D
  5. Pin E
  • [4]
  • (1)
  • Many chips make pad 1 irregular or put an indicator marking on it. On this chip it is a pentagon. Some even go so far as to actually number every pin, although that is less common. If there wasn't something like this on the die or verification is needed one can of course also prepare the chip live (or at least with pins in place) by not doing bare die decapsulation.
    • 

• Identity VDD
  • Detail
    • 
    • Delayering showed this to be a basic logic 1 metal chip with poly
    • Hint: think CD4000 compatible. Are there standard pinouts?
  1. Pin A
  2. Pin B
  3. Pin C
  4. Pin D
  5. Pin E
  • [3]
  • (1)
  • You should be able to narrow it to pin C or E without too much trouble as they are the only ones that spider out all over the chip. A lot of chips like this are either 7400 or CD4000 compatible. Combined with this being a very simple chip it makes it a good bet. Assuming that, most CD4000 chips put VDD as the highest numbered pin and VSS as the pin opposite. In our chip we have power pins at pin 7 and 14 which matches this. Therefore, pin 14 is VDD.
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