Data Sheet - Freescale Semiconductor

Terminology and guidelines
5.5 Result of exceeding a rating
Failures in time (ppm)
40
30
20
10
0
Measured characteristic
The likelihood of permanent chip failure increases rapidly as
soon as a characteristic begins to exceed one of its operating ratings.
Operating rating
5.6 Relationship between ratings and operating requirements
–∞
–∞
Fatal range
Expected permanent failure
Fatal range
Expected permanent failure
Operating rating (min.)
Operating requirement (min.)
Degraded operating range Normal operating range Degraded operating range
- No permanent failure
- Possible decreased life
- Possible incorrect operation
Handling rating (min.)
- No permanent failure
- Correct operation
Operating (power on)
Handling range
No permanent failure
Handling (power off)
Operating requirement (max.)
- No permanent failure
- Possible decreased life
- Possible incorrect operation
5.7 Guidelines for ratings and operating requirements
Follow these guidelines for ratings and operating requirements:
Operating rating (max.)
Fatal range
Expected permanent failure
Handling rating (max.)
Fatal range
Expected permanent failure
• Never exceed any of the chip’s ratings.
• During normal operation, don’t exceed any of the chip’s operating requirements.
• If you must exceed an operating requirement at times other than during normal
operation (for example, during power sequencing), limit the duration as much as
possible.
MC56F8458x Advance Information Data Sheet, Rev. 2, 06/2012.
20 Preliminary Freescale Semiconductor, Inc.
General Business Information
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