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參數(shù)資料
| 型號： | ICS843251AGI-14LFT |
| 廠商： | IDT, Integrated Device Technology Inc |
| 文件頁數(shù)： | 3/15頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CLK GEN ETHERNET 25MHZ 8TSSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | HiPerClockS™, FemtoClock™ |
| 類型： | 時鐘發(fā)生器 |
| PLL： | 是 |
| 輸入： | 晶體 |
| 輸出： | LVPECL |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 1:1 |
| 差分 - 輸入:輸出： | 無/是 |
| 頻率 - 最大： | 170MHz |
| 除法器/乘法器： | 是/是 |
| 電源電壓： | 2.375 V ~ 3.465 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-TSSOP |
| 包裝： | 帶卷 (TR) |
ICS844251-14
FEMTOCLOCK CRYSTAL-TO-LVDS CLOCK GENERATOR
IDT / ICS LVDS CLOCK GENERATOR
11
ICS844251BG-14 REV. A NOVEMBER 19, 2012
Power Considerations
This section provides information on power dissipation and junction temperature for the ICS844251-14.
Equations and example calculations are also provided.
1.
Power Dissipation.
The total power dissipation for the ICS844251-14 is the sum of the core power plus the analog power plus the power dissipated in the
load(s). The following is the power dissipation for VDD = 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 = VDD_MAX * (IDD_MAX + IDDA_MAX) = 3.465V * (100mA + 10mA) = 381.15mW
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 is 125°C.
The equation for Tj is as follows: Tj =
JA * Pd_total + TA
Tj = Junction Temperature
JA = Junction-to-Ambient Thermal Resistance
Pd_total = Total Device Power Dissipation (example calculation is in section 1 above)
TA = Ambient Temperature
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance
JA must be used. Assuming no air flow
and a multi-layer board, the appropriate value is 129.5.°C/W per Table 6 below.
Therefore, Tj for an ambient temperature of 70°C with all outputs switching is:
70°C + 0.381W *129.5°C/W = 119.3°C. This is 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).
Table 6. Thermal Resistance JA for 8 Lead TSSOP, Forced Convection
JA by Velocity
Meters per Second
01
2.5
Multi-Layer PCB, JEDEC Standard Test Boards
129.5°C/W
125.5°C/W
123.5°C/W
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICS843251BGI-12 | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR |
| ICS843251BGI-12FT | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR |
| ICS843251BGI-12LF | 功能描述:IC CLK GENERATOR LVPECL 8-TSSOP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:HiPerClockS™, FemtoClock™ 標(biāo)準(zhǔn)包裝:27 系列:Precision Edge® 類型:頻率合成器 PLL:是 輸入:PECL，晶體 輸出:PECL 電路數(shù):1 比率 - 輸入:輸出:1:1 差分 - 輸入:輸出:無/是 頻率 - 最大:800MHz 除法器/乘法器:是/無 電源電壓:3.135 V ~ 5.25 V 工作溫度:0°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC 包裝:管件 |
| ICS843251BGI-12LFT | 功能描述:IC CLK GENERATOR LVPECL 8-TSSOP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:HiPerClockS™, FemtoClock™ 標(biāo)準(zhǔn)包裝:1,000 系列:- 類型:時鐘/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 |
| ICS843251BGI-12T | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR |
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