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參數(shù)資料
| 型號： | SC3308Q/TD |
| 廠商： | APPLIEDMICRO INC |
| 元件分類： | 時鐘及定時 |
| 英文描述： | LVTTL SERIES, LOW SKEW CLOCK DRIVER, 20 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP52 |
| 封裝： | 0.039 INCH PITCH, PLASTIC, QFP-52 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大?。?/td> | 115K |
| 代理商： | SC3308Q/TD |
Applied Micro Circuits Corporation
6290 Sequence Dr., San Diego, CA 92121-4358
7
20-OUTPUT LVTTL CLOCK DRIVERS
SC3306/08
Power Management
The overall goal of managing the power dissipated by
the clock driver is to limit its junction (die) temperature
to 140
°C. A major component of the power dissipated
internally by the clock driver is determined by the load
that each output drives and the frequency that each
output is running. The “Output Power Dissipation”
table summarizes these dependencies (see “AC Test/
Evaluation Circuit”, for complete load definition).
The output power must be added to the core power
(600 mW) of the clock driver to determine the total
power being dissipated by the clock driver. This total
power is then multiplied by the clock driver’s thermal
resistance, with the result being added to the ambient
temperature to determine the junction temperature of
the clock driver. For greatest reliability, this junction
temperature should not exceed 140
°C. The thermal
resistance for the clock driver is detailed in the 52-pin
PQFP Thermal Dissipation vs. Airflow graph in the
Package appendix at the end of this section.
For example: An application utilizes a clock driver
with 8 Fb outputs driving 10 pF loads at 66 MHz, 3 Fa
outputs driving 5 pF loads at 33 MHz and 2 Fa out-
puts driving 15 pF loads at 33 Mhz. Total chip power
is calculated as follows:
Core Power
= 600 mW
8 Fb, 10 pF, 66 MHz = (8 x 33 mW)
= 264 mW
2 Fb, no load, 66 MHz = (2 x 11 mW)
= 22 mW
3 Fa1, 5 pF, 33 MHz = (3 x 13 mW)
= 39 mW
2 Fa1, no load, 33 MHz = (2 x 8 mW)
= 16 mW
2 Fa2, 15 pF, 33 MHz = (2 x 17 mW)
= 34 mW
3 Fa2, no load, 33 MHz = (3 x 8 mW)
= 24 mW
Total Power = 999 mW
The design specifies a 70C still air ambient. Refer-
ring to the 52-pin PQFP Thermal Dissipation vs. Air-
flow graph in the Package appendix, the
Θja for still
air is 46.2C/watt. The clock driver’s junction tem-
perature would then be:
70C + (.999 watts x 46.2C/watt) = 116C
Note this is below the 140C maximum junction tem-
perature.
FREQUENCY CLOAD=5pF CLOAD=10pF
CLOAD=15pF CLOAD=25pF
NO LOAD
80 MHz
29 mW
36 mW
43 mW
62 mW
13 mW
66 MHz
27 mW
33 mW
39 mW
53 mW
11 mW
50 MHz
20 mW
23 mW
27 mW
42 mW
10 mW
40 MHz
18 mW
21 mW
25 mW
36 mW
9 mW
33 MHz
13 mW
15 mW
17 mW
32 mW
8 mW
25 MHz
11 mW
13 mW
14 mW
22 mW
8 mW
20 MHz
10 mW
11 mW
13 mW
17 mW
7 mW
Output Power Dissipation
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