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ICS5314AI11L Folha de dados(PDF) 13 Page - Integrated Circuit Systems

Nome de Peças ICS5314AI11L
Descrição Electrónicos  LOW SKEW, 1-TO-5 DIFFERENTIAL-TO-2.5V/3.3V LVPECL FANOUT BUFFER
PDF  18 Pages
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Fabricante Electrônico  ICST [Integrated Circuit Systems]
Página de início  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS5314AI11L Folha de dados(HTML) 13 Page - Integrated Circuit Systems

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85314AGI-11
www.icst.com/products/hiperclocks.html
REV. C MAY 24, 2005
13
Integrated
Circuit
Systems, Inc.
ICS85314I-11
LOW SKEW, 1-TO-5
DIFFERENTIAL-TO-2.5V/3.3V LVPECL FANOUT BUFFER
3. Calculations and Equations.
LVPECL output driver circuit and termination are shown in Figure 6.
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
– 1.0V
(V
CC_MAX
- V
OH_MAX
) = 1.0V
•
For logic low, V
OUT
= V
OL_MAX
= V
CC_MAX
– 1.7V
(V
CC_MAX
- V
OL_MAX
) = 1.7V
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 - 1V)/50
Ω] * 1V = 20.0mW
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 - 1.7V)/50
Ω] * 1.7V = 10.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30.2mW
FIGURE 6. LVPECL DRIVER CIRCUIT AND TERMINATION
Q1
V
OUT
V
CC
RL
50
V
CC - 2V



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