Terminology and guidelines
3.4.1 Example
This is an example of an operating rating:
Symbol
V
DD
Description
1.0 V core supply
voltage
–0.3
Min.
1.2
Max.
V
Unit
3.5 Result of exceeding a rating
40
Failures in time (ppm)
30
20
The likelihood of permanent chip failure increases rapidly as
soon as a characteristic begins to exceed one of its operating ratings.
10
0
Operating rating
Measured characteristic
3.6 Relationship between ratings and operating requirements
go
rh
ng
dli
an
(
ing
rat
n.
mi
)
n
me
ire
u
req
)
in.
t (m
in
rat
pe
gr
u
eq
me
ire
nt
(m
.)
ax
go
rh
dli
an
ng
rat
(
ing
ma
x.)
Op
tin
era
Op
g
tin
era
O
e
Op
in
rat
Fatal
range
- Probable permanent failure
Limited
operating
range
- No permanent failure
- Possible decreased life
- Possible incorrect operation
Normal
operating
range
- No permanent failure
- Correct operation
Limited
operating
range
- No permanent failure
- Possible decreased life
- Possible incorrect operation
Fatal
range
- Probable permanent failure
Handling range
- No permanent failure
–∞
∞
3.7 Guidelines for ratings and operating requirements
Follow these guidelines for ratings and operating requirements:
• Never exceed any of the chip’s ratings.
MCF51JU128 Data Sheet, Rev. 4, 01/2012.
6
Freescale Semiconductor, Inc.
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
