11 Mar
2008
11 Mar
'08
12:12 a.m.
From: ard at p850ug1.demon.co.uk
---snip---
And be very careful with those testers. Some of them will pass chips that
don't work correctly in the circuit. THe main problem is timing-related
(I've had chips 'go slow' and have excessivley large propagation delays,
most testers will not pick that up). But some of the cheaper testers fail
to distinguish between a 'high' output and a floating one, and thuse
don't fial chips where the upper transistor of the output stage has
failed. And yes, I've had that.
Hi
It must have been a Fairchild part. When at Intel they were
notorious for that.
Dwight
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