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| 型号： | ICS843021AGLF |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 2/15页 |
| 文件大小： | 0K |
| 描述： | IC CLK GEN 1GIG LVPECL 8-TSSOP |
| 特色产品： | Gigabit Ethernet Clock Synthesizer |
| 标准包装： | 96 |
| 系列： | HiPerClockS™, FemtoClock™ |
| 类型： | 时钟/频率合成器，时钟发生器 |
| PLL： | 是 |
| 输入： | 晶体 |
| 输出： | LVPECL |
| 电路数： | 1 |
| 比率 - 输入:输出： | 1:1 |
| 差分 - 输入:输出： | 无/是 |
| 频率 - 最大： | 140MHz |
| 除法器/乘法器： | 是/无 |
| 电源电压： | 2.97 V ~ 3.63 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 8-TSSOP |
| 包装： | 管件 |
| 产品目录页面： | 1250 (CN2011-ZH PDF) |
| 其它名称： | 800-1133 800-1133-5 800-1133-ND 843021AGLF |
ICS843021AG REVISION D OCTOBER 12, 2010
10
2010 Integrated Device Technology, Inc.
ICS843021 Data Sheet
FEMTOCLOCK CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR
Power Considerations
This section provides information on power dissipation and junction temperature for the ICS843021.
Equations and example calculations are also provided.
1.
Power Dissipation.
The total power dissipation for the ICS843021 is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for VCC= 3.3V + 10% = 3.63V, 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 = 3.63V * 85mA = 308.6mW
Power (outputs)MAX = 30mW/Loaded Output pair
Total Power_MAX (3.63V, with all outputs switching) = 308.6mW + 30mW = 338.6mW
2. Junction Temperature.
Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad directly affects the reliability of the device. The
maximum recommended junction temperature is 125°C. Limiting the internal transistor junction temperature, Tj, to 125°C ensures that the bond
wire and bond pad temperature remains below 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)
TA = 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 90.5°C/W per Table 8 below.
Therefore, Tj for an ambient temperature of 70°C with all outputs switching is:
70°C + 0.339W * 90.5°C/W = 100.7°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 (multi-layer).
Table 8. Thermal Resitance θJA for 8 Lead TSSOP, Forced Convection
θ
JA vs. Air Flow
Meters per Second
01
2.5
Multi-Layer PCB, JEDEC Standard Test Boards
101.7°C/W
90.5°C/W
89.8°C/W
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS843021AGLFT | 功能描述:IC CLK GENERATOR LVPECL 8-TSSOP RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:HiPerClockS™, FemtoClock™ 标准包装:1,000 系列:- 类型:时钟/频率合成器，扇出分配 PLL:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 除法器/乘法器:- 电源电压:- 工作温度:- 安装类型:表面贴装 封装/外壳:56-VFQFN 裸露焊盘 供应商设备封装:56-VFQFP-EP（8x8） 包装:带卷 (TR) 其它名称:844S012AKI-01LFT |
| ICS843021AGT | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V LVPECL CLOCK GENERATOR |
| ICS843021I-01 | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS-TM CRYSTAL-TO-3.3V, 2.5V 125MHZ LVPECL CLOCK GENERATOR |
| ICS843022 | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V LVPECL CLOCK GENERATOR |
| ICS843022AG | 制造商:INT_DEV_TECH 功能描述: |
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