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参数资料
| 型号： | ICS8422002AGIT |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 226.66 MHz, OTHER CLOCK GENERATOR, PDSO20 |
| 封装： | 6.50 X 4.40 MM, 0.92 MM HEIGHT, MO-153, TSSOP-20 |
| 文件页数： | 13/13页 |
| 文件大小： | 315K |
| 代理商： | ICS8422002AGIT |
8422002AGI
9
REV. B JANUARY 11, 2008
ICS8422002I
FEMTOCLOCKS CRYSTAL-TO-
LVHSTL FREQUENCY SYNTHESIZER
PRELIMINARY
POWER CONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS8422002I.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS8422002I is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for V
DD = 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 * 100mA = 346.5mW
Power (outputs)
MAX = 32.8mW/Loaded Output pair
If all outputs are loaded, the total power is 2 * 32.8mW = 65.6mW
Total Power
_MAX (3.465V, with all outputs switching) = 346.5mW + 65.6mW = 412.1mW
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 66.6°C/W per Table 6 below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.412W * 66.6°C/W = 112.4°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).
θθθθθ
JA by Velocity (Linear Feet per Minute)
0
200
500
Single-Layer PCB, JEDEC Standard Test Boards
114.5°C/W
98.0°C/W
88.0°C/W
Multi-Layer PCB, JEDEC Standard Test Boards
73.2°C/W
66.6°C/W
63.5°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
TABLE 6. THERMAL RESISTANCE
θθθθθ
JA
FOR
20-PIN TSSOP, FORCED CONVECTION
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS8422002I | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
| ICS8422002I-01 | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
| ICS8422004-01I | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
| ICS8422004AGI | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS? LVCMOS/CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
| ICS8422004AGI-01 | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER |
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