mc68331cpv20b1 Freescale Semiconductor, Inc, mc68331cpv20b1 Datasheet - Page 179

• Manufacturer Part Number: mc68331cpv20b1
• Description: Mc68331 32 Bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

MC68331
USER’S MANUAL
Num
1
2
3
4
5
6
NOTES:
Num
PLL Reference Frequency Range
System Frequency
On-Chip PLL System Frequency
External Clock Operation
PLL Lock Time
VCO Frequency
Limp Mode Clock Frequency
CLKOUT Stability
1
The average chip-junction temperature (T
where
For most applications P
T
Solving equations 1 and 2 for K gives:
where K is a constant pertaining to the particular part. K can be determined from equation (3) by mea-
suring P
tained by solving equations (1) and (2) iteratively for any value of T
J
(if P
SYNCR X bit = 0
SYNCR X bit = 1
Short term (5 s interval)
Long term (500 s interval)
Thermal Resistance
I/O
Plastic 132-Pin Surface Mount
Plastic 144-Pin Surface Mount
Thin Plastic 144-Pin Surface Mount
D
is neglected) is:
T
P
P
P
(at equilibrium) for a known T
(V
A
D
INT
I/O
Table A-4 16.78 MHz Clock Control Timing
Characteristic
DD
Freescale Semiconductor, Inc.
2,3,4,5
6
and V
=
=
=
=
=
For More Information On This Product,
Table A-3 Thermal Characteristics
2,3,4,7
1
Ambient Temperature, C
Package Thermal Resistance, Junction-to-Ambient, C/W
P
I
Power Dissipation on Input and Output Pins — User Determined
ELECTRICAL CHARACTERISTICS
DD
DDSYN
Rating
INT
I/O
+ P
< P
V
Go to: www.freescale.com
DD
K = P
= 5.0 Vdc 10%, V
I/O
INT
32.768 kHz reference)
, Watts — Chip Internal Power
and can be neglected. An approximate relationship between P
D
P
T
+ (T
J
D
= T
= K
A
A
. Using this value of K, the values of P
J
A
+ 273 C) +
) in C can be obtained from:
+ (P
Symbol
(T
C
f
f
f
VCO
t
f
limp
sys
lpll
stab
J
ref
D
SS
+ 273 C)
Symbol
= 0 Vdc, T
)
0.131
–0.05
–0.5
Min
25
dc
dc
P
—
—
—
A
D
= T
2
Value
L
A
to T
38
46
49
.
2 (f
f
sys
f
H,
sys
16.78
16.78
16.78
sys
Max
0.05
0.5
50
20
max/2
max
max)
D
Unit
C/W
and T
MHz
MHz
MHz
Unit
kHz
ms
J
can be ob-
D
and
A-3
(1)
(3)
(2)
A