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參數(shù)資料
| 型號： | 853S314AGILFT |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時鐘及定時 |
| 英文描述： | 853S SERIES, LOW SKEW CLOCK DRIVER, 4 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO20 |
| 封裝： | 4.40 MM X 6.50 MM, 0.925 MM HEIGHT, ROHS COMPLIANT, MO-153, TSSOP-20 |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 282K |
| 代理商： | 853S314AGILFT |
IDT / ICS 3.3V, 2.5V LVPECL/ECL FANOUT BUFFER
11
ICS853S314AFI REV. A JANUARY 24, 2009
ICS853S314I
LOW SKEW, 1-TO-4 DIFFERENTIAL-TO-2.5V, 3.3V LVPECL/ECL FANOUT BUFFER
3. Calculations and Equations.
LVPECL output driver circuit and termination are shown in
Figure 3.
To calculate worst case power dissipation into the load, use the following equations which assume a 50
Ω load, and a
termination
voltage of V
CC
- 2V.
For logic high, V
OUT
= V
OH_MAX
= V
CC_MAX
– 0.7V
(V
CC_MAX
- V
OH_MAX
) = 0.7V
For logic low, V
OUT
= V
OL_MAX
= V
CC_MAX
– 1.5V
(V
CC_MAX
- V
OL_MAX
) = 1.5V
Pd_H is power dissipation when the output drives high.
Pd_L is the power dissipation when the output drives low.
Pd_H = [(V
OH_MAX
– (V
CC_MAX
- 2V))/R
L
] * (V
CC_MAX
- V
OH_MAX
) = [(2V - (V
CC_MAX
- V
OH_MAX
))/R
L
] * (V
CC_MAX
- V
OH_MAX
) =
[(2V - 0.7V)/50
Ω] * 0.7V = 18.0mW
Pd_L = [(V
OL_MAX
– (V
CC_MAX
- 2V))/R
L
] * (V
CC_MAX
- V
OL_MAX
) = [(2V - (V
CC_MAX
- V
OL_MAX
))/R
L
] * (V
CC_MAX
- V
OL_MAX
) =
[(2V - 1.5V)/50
Ω] * 1.5V = 15mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 33mW
FIGURE 3. LVPECL DRIVER CIRCUIT AND TERMINATION
Q1
V
OUT
V
CC
RL
50
V
CC - 2V
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