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ICS853014 Datasheet(PDF) 13 Page - Integrated Circuit Systems

No. de pieza ICS853014
Descripción Electrónicos  LOW SKEW, 1-TO-5 2.5V/3.3V DIFFERENTIAL-TO-LVPECL/ECL FANOUT BUFFER
PDF  17 Pages
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Fabricante Electrónico  ICST [Integrated Circuit Systems]
Página de inicio  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS853014 Datasheet(HTML) 13 Page - Integrated Circuit Systems

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REV. C MAY 13, 2005
13
Integrated
Circuit
Systems, Inc.
ICS853014
LOW SKEW, 1-TO-5
2.5V/3.3V DIFFERENTIAL-TO-LVPECL/ECL FANOUT BUFFER
3. Calculations and Equations.
LVPECL output driver circuit and termination are shown in
Figure 7.
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
– 0.935V
(V
CC_MAX
- V
OH_MAX
) = 0.935V
•
For logic low, V
OUT
= V
OL_MAX
= V
CC_MAX
– 1.67V
(V
CC_MAX
- V
OL_MAX
) = 1.67V
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 - 0.935V)/50
Ω] * 0.935V = 19.92mW
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 - 1.67V)/50
Ω] * 1.67V = 11.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30.94mW
FIGURE 7. LVPECL DRIVER CIRCUIT AND TERMINATION
VOUT
Q1
VCC - 2V
RL
50
VCC



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