7-
15
Input - 15V, 1 kΩ
ΩΩ
Ω range Output pin - 15V, 1 kΩ
ΩΩ
Ω range
Figure 7-15. Signatures Of A 7805 Voltage Regulator By SGS Thomson.
Ground Pin To Common
Input - 15V,1 kΩ
ΩΩ
Ω range Output pin - 15V,1 kΩ
ΩΩ
Ω range
Figure 7-16. Signatures Of A 7805 Voltage Regulator By Motorola.
Ground Pin To Common
Review
• Integrated circuits are complex devices that are built using basic electronic components.
• The IC signatures resemble zener diodes.
• There are many causes for IC failures and the Tracker 2700 can display its "health" as
resistive leakage, an open or a short.
• Functionally identical pins on a single IC out-of-circuit will display the same signature.
• The most common point for reference is ground, but V
CC
or another point might give a more
informative signature.
• Different analog IC families exhibit different characteristic signatures.
• To simplify the large number of signature variations, use the comparison test strategy with
the Tracker 2700. The Tracker 2700 features alternate switching and display of the A and B
channels to allow comparison of two individual signatures.
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