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参数资料
| 型号： | FMS6144AMTC14X |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 2/13页 |
| 文件大小： | 0K |
| 描述： | IC DVR VID FILTER SD 4CH 14TSSOP |
| 标准包装： | 2,500 |
| 类型： | 视频滤波器 |
| 应用： | 机顶盒，视频播放器，录音机 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 14-TSSOP |
| 包装： | 带卷 (TR) |
ICS8545-02
LOW SKEW, 1-TO-4, LVCMOS/LVTTL-TO-LVDS FANOUT BUFFER
IDT / ICS LVDS FANOUT BUFFER
10
ICS8545AG-02 REV. A March 3, 2009
Power Considerations
This section provides information on power dissipation and junction temperature for the ICS8545-02.
Equations and example calculations are also provided.
1.
Power Dissipation.
The total power dissipation for the ICS8545-02 is the sum of the core 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 = 3.465V * 90mA = 311.85mW
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 HiPerClockS 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)
TA = Ambient Temperature
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance
θ
JA must be used. Assuming no air flow
and a multi-layer board, the appropriate value is 91.1°C/W per Table 6 below.
Therefore, Tj for an ambient temperature of 70°C with all outputs switching is:
70°C + 0.312W * 91.1°C/W = 98.4°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 θJA for 20 Lead TSSOP, Forced Convection
θ
JA by Velocity
Meters per Second
01
2.5
Multi-Layer PCB, JEDEC Standard Test Boards
91.1°C/W
86.7°C/W
84.6°C/W
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