Summary of steps to fully test for I/O-to-I/O shorts
A companion table to "Continuity testing," which we published in our August 2005 issue.
C.H. Lim -- Test & Measurement World, 7/26/2005 2:49:00 PM
| Step 1 | Perform parallel continuity testing by setting device grounds to reference potential (usually ground potential).
This step detects continuity open on all singular I/O’s that are not fanned out from an internally shorted plane like the device power supply or ground.
All I/O’s adjacent to the reference ground I/O’s used for this parallel continuity test can be detected when shorted to the ground I/O’s themselves.
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| Step 2 |
Vertically ground alternate columns on the package plus the device ground I/O’s and test for continuity on remaining I/O’s. Note that if the device contains multiple supplies and grounds internally shorted together, all of them will have the same potential when any one of them is grounded. ![]() This step detects I/O-to-I/O shorts horizontally and diagonally. |
| Step 3 | Horizontally ground alternate rows on the package plus the device ground I/O’s and test for continuity on remaining I/O’s. As before, all supplies and grounds internally connected on the die have the same potential when any one of them is grounded.
![]() This step detects I/O-to-I/O shorts vertically. |
| Step 4 | By doing a logical AND followed by a logical XOR operation on I/O’s with undetectable shorts from steps 2 and steps 3 above, identify the final map of I/O’s that would not fail when shorted to adjacent pins. From here, ground all device supplies and grounds and test for continuity on the identified I/O’s to complete the test iteration.
This final step completes the detection of I/O-to-I/O short on the package.
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This step detects continuity open on all singular I/O’s that are not fanned out from an internally shorted plane like the device power supply or ground.
All I/O’s adjacent to the reference ground I/O’s used for this parallel continuity test can be detected when shorted to the ground I/O’s themselves.


This final step completes the detection of I/O-to-I/O short on the package.



