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| 型號(hào)： | ICS8432CY-111 |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時(shí)鐘及定時(shí) |
| 英文描述： | 8432 SERIES, PLL BASED CLOCK DRIVER, 2 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32 |
| 封裝： | 7 X 7 MM, 1.40 MM HEIGHT, MS-026BBA, LQFP-32 |
| 文件頁(yè)數(shù)： | 4/17頁(yè) |
| 文件大?。?/td> | 144K |
| 代理商： | ICS8432CY-111 |
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8432CY-111
www.icst.com/products/hiperclocks.html
REV. C APRIL 12, 2007
12
Integrated
Circuit
Systems, Inc.
ICS8432-111
700MHZ/350MHZ
DIFFERENTIAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
POWER CONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS8432-111.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS8432-111 is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for V
CC = 3.3V + 5% = 3.465V, which gives worst case results.
NOTE: Please refer to Section 3 for details on calculating power dissipated in the load.
Power (core)
MAX = VCC_MAX * IEE_MAX = 3.465V * 140mA = 485.1mW
Power (outputs)
MAX = 30mW/Loaded Output pair
If all outputs are loaded, the total power is 2 * 30mW = 60mW
Total Power
_MAX (3.465V, with all outputs switching) = 485.1mW + 60mW = 545.1mW
2. Junction Temperature.
Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad and directly affects the reliability of the
device. The maximum recommended junction temperature for HiPerClockSTM devices is 125°C.
The equation for Tj is as follows: Tj =
θ
JA * Pd_total + TA
Tj = Junction Temperature
θ
JA = junction-to-ambient thermal resistance
Pd_total = Total device power dissipation (example calculation is in section 1 above)
T
A = Ambient Temperature
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance
θ
JA must be used. Assuming a
moderate air flow of 200 linear feet per minute and a multi-layer board, the appropriate value is 42.1°C/W per Table 7 below.
Therefore, Tj for an ambient temperature of 70°C with all outputs switching is:
70°C + 0.545W * 42.1°C/W = 93°C. This is well below the limit of 125°C.
This calculation is only an example. Tj will obviously vary depending on the number of loaded outputs, supply voltage, air flow,
and the type of board (single layer or multi-layer).
θθθθθ
JA by Velocity (Linear Feet per Minute)
Table 7. THERMAL RESISTANCE
θθθθθ
JA
FOR
32-PIN LQFP, FORCED CONVECTION
0
200
500
Single-Layer PCB, JEDEC Standard Test Boards
67.8°C/W
55.9°C/W
50.1°C/W
Multi-Layer PCB, JEDEC Standard Test Boards
47.9°C/W
42.1°C/W
39.4°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
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| ICS8432DY-101LF | 8432 SERIES, PLL BASED CLOCK DRIVER, 2 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PQFP32 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICS8432CY-111LF | 功能描述:IC SYNTHESIZER 700/350MHZ 32LQFP RoHS:是 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器 系列:HiPerClockS™ 標(biāo)準(zhǔn)包裝:1,000 系列:- 類型:時(shí)鐘/頻率合成器，扇出分配 PLL:- 輸入:- 輸出:- 電路數(shù):- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 除法器/乘法器:- 電源電壓:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:56-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-VFQFP-EP（8x8） 包裝:帶卷 (TR) 其它名稱:844S012AKI-01LFT |
| ICS8432CY-111LFT | 功能描述:IC SYNTHESIZER 700/350MHZ 32LQFP RoHS:是 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器 系列:HiPerClockS™ 標(biāo)準(zhǔn)包裝:1,000 系列:- 類型:時(shí)鐘/頻率合成器，扇出分配 PLL:- 輸入:- 輸出:- 電路數(shù):- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 除法器/乘法器:- 電源電壓:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:56-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-VFQFP-EP（8x8） 包裝:帶卷 (TR) 其它名稱:844S012AKI-01LFT |
| ICS8432CY-111T | 制造商:ICS 制造商全稱:ICS 功能描述:700MHZ/350MHZ DIFFERENTIAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS8432DI-101 | 制造商:ICS 制造商全稱:ICS 功能描述:700MHZ, DIFFERENTIAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS8432DY101 | 制造商:ICS 功能描述: |
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