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參數(shù)資料
| 型號(hào)： | ICS871002AGI-02LFT |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時(shí)鐘及定時(shí) |
| 英文描述： | 871002 SERIES, PLL BASED CLOCK DRIVER, 2 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO20 |
| 封裝： | 6.50 X 4.40 MM, 0.92 MM HEIGHT, ROHS COMPLIANT, MO-153, TSSOP-20 |
| 文件頁數(shù)： | 14/14頁 |
| 文件大?。?/td> | 281K |
| 代理商： | ICS871002AGI-02LFT |
IDT / ICS 0.7V DIFFERENTIAL JITTER ATTUNUATOR
9
ICS871002AGI-02 REV. A SEPTEMBER 14, 2007
ICS871002I-02
DIFFERENTIAL-TO-0.7V DIFFERENTIAL PCI EXPRESS JITTER ATTENUATOR
PRELIMINARY
POWER CONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS871002I-02.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS871002I-02 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 V
DD
= 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
= V
DD_MAX
* (I
DD_MAX
+ I
DDA_MAX
) = 3.63V * (75mA + 15mA) = 326.7mW
Power (outputs)
MAX
= 47.75mW/Loaded Output pair
If all outputs are loaded, the total power is 2 * 47.75mW = 95.5mW
Total Power
_MAX
(3.63V, with all outputs switching) = 326.7mW + 95.5mW = 422.2mW
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
TM 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 no air
flow and a multi-layer board, the appropriate value is 86.7°C/W per Table 6 below.
Therefore, Tj for an ambient temperature of 85°C with all outputs switching is:
85°C + 0.422W * 86.7°C/W = 121°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
θθθθθ
JA
FOR
20-PIN TSSOP, FORCED CONVECTION
θθθθθ
JA
by Velocity (Meters per Second)
0
1
2.5
Multi-Layer PCB, JEDEC Standard Test Boards
86.7°C/W
82.4°C/W
80.2°C/W
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