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參數(shù)資料
| 型號： | S4503 |
| 廠商： | Applied Micro Circuits Corp. |
| 英文描述： | BiCMOS Clock Synthesizer(帶可編程時鐘輸出的BiCMOS時鐘合成器) |
| 中文描述： | BiCMOS工藝時鐘合成器（帶可編程時鐘輸出的BiCMOS工藝時鐘合成器） |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 117K |
| 代理商： | S4503 |
Applied Micro Circuits Corporation
6195 Lusk Blvd., San Diego, CA 92121 (619) 450-9333
Page 6
S4503
CLOCK SYNTHESIZER
Power Management
The overall goal of managing the power dissipated by the S4503 is to limit its junction (die) temperature to 130
°
C. A
major component of the power dissipated internally by the S4503 is determined by the load that each TTL output
drives and the frequency that each output is running. The following table summarizes these dependencies.
C =5pF
42 mW
C =10pF
51 mW
C =15pF
61 mW
C =25pF
88 mW
C =40pF
132 mW
FREQUENCY
NO LOAD
80 MHz
18 mW
66 MHz
50 MHz
38 mW
28 mW
47 mW
33 mW
55 mW
39 mW
75 mW
60 mW
110 mW
85 mW
16 mW
14 mW
40 MHz
33 MHz
25 mW
19 mW
30 mW
22 mW
36 mW
24 mW
52 mW
46 mW
70 mW
65 mW
13 mW
12 mW
25 MHz
16 mW
18 mW
20 mW
32 mW
60 mW
11 mW
20 MHz
14 mW
16 mW
18 mW
24 mW
44 mW
10 mW
The above output power must then be added to the core power (700 mW) of the S4503 to determine the total power
being dissipated by the S4503. This total power is then multiplied by the S4503’s thermal resistance, with the result
being added to the ambient temperature to determine the junction temperature of the S4503. For greatest reliability
this junction temperature should not exceed 130
°
C. The thermal resistance for the S4503 soldered to a multi-layer
PCB is as follows:
Designing the S4503 for “Real Loads”
The S4503 is designed to provide clean clock transitions when presented with a realistic load. The assumptions
are that the S4503 will be driving a selected length(s) of 70 Ohm (Zo) P.C. board trace terminated by a small
number of end of line clustered TTL or CMOS input receiver pins. This end of line capacitive loading can cause
overall impedance to drop to under 60 Ohms. Therefore, to a first approximation, this clock output driver will
cleanly drive P.C. line lengths of 6" to 12" with capacitive loads ranging up to 20 pF at frequencies up to 80 MHz.
Higher capacitive loads (greater than 25 pF) at high frequencies (greater than 50 MHz) may require the like
output drivers to be strapped in parallel.
Within this general circuit model, AMCC has developed the Evaluation Circuit presented on the following page.
This is a mid-point model and can be modified to reflect a specific end use. More details concerning this are
presented in the Application Note.
Still Air
50C/Watt
45C/Watt
40C/Watt
Thermal Resistance
100 Lin Ft/Min
200 Lin Ft/Min
相關(guān)PDF資料 |
PDF描述 |
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| S4505 | RAMBUS COMPATIBLE CLOCK GENERATORS |
| S4505S | RAMBUS COMPATIBLE CLOCK GENERATORS |
| S4506 | RAMBUS COMPATIBLE CLOCK GENERATORS |
| S4506S | RAMBUS COMPATIBLE CLOCK GENERATORS |
| S4507 | RAMBUS COMPATIBLE CLOCK GENERATORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S450-31 1M SET4+8 | 制造商:RAACO 功能描述:SHELVING BAY SET, 4 SHELVES, 2M HIGH |
| S4505 | 制造商:AMCC 制造商全稱:Applied Micro Circuits Corporation 功能描述:RAMBUS COMPATIBLE CLOCK GENERATORS |
| S4505S | 制造商:AMCC 制造商全稱:Applied Micro Circuits Corporation 功能描述:RAMBUS COMPATIBLE CLOCK GENERATORS |
| S4505S/D | 制造商:AMCC 制造商全稱:Applied Micro Circuits Corporation 功能描述:RAMBUS COMPATIBLE CLOCK GENERATORS |
| S4505S/TD | 制造商:AMCC 制造商全稱:Applied Micro Circuits Corporation 功能描述:RAMBUS COMPATIBLE CLOCK GENERATORS |
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