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| 型号： | ICS843031AGLFT |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 13/14页 |
| 文件大小： | 0K |
| 描述： | IC CLK GENERATOR LVPECL 8-TSSOP |
| 标准包装： | 2,500 |
| 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： | 350MHz |
| 除法器/乘法器： | 是/是 |
| 电源电压： | 3.135 V ~ 3.465 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： | 带卷 (TR) |
| 其它名称： | 843031AGLFT |
CS843031AG REVISION A OCTOBER 5, 2011
8
2011 Integrated Device Technology, Inc.
ICS843031 Data Sheet
FEMTOCLOCK
CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR
POWER CONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS843051.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS843051 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_TYP = 3.465V * 105mA = 363.83mW
Power (outputs)
MAX = 30mW/Loaded Output pair
Total Power
_MAX (3.465V, with all outputs switching) = 363.8mW + 30mW = 393.8mW
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 the 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 1 meter per second and a multi-layer board, the appropriate value is 90.5°C/W per Table 6 below.
Therefore, Tj for an ambient temperature of 70°C with all outputs switching is:
70°C + 0.394W * 90.5°C/W = 105.65°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).
TABLE 6. THERMAL RESISTANCE
θθθθθ
JA
FOR
8-PIN TSSOP, FORCED CONVECTION
θθθθθ
JA by Velocity (Meters per Second)
0
1
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 |
|---|---|
| ICS843031AGT | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL CLOCK GENERATOR |
| ICS843034 | 制造商:ICS 制造商全称:ICS 功能描述:MULTI-RATE 3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER |
| ICS843034-01 | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS? MULTI-RATE LVPECL FREQUENCY SYNTHESIZER |
| ICS843034A01 | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS⑩ MULTI-RATE LVPECL FREQUENCY SYNTHESIZER |
| ICS843034AY | 制造商:ICS 制造商全称:ICS 功能描述:MULTI-RATE 3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER |
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