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ICS8535BKI-01LF Datasheet(PDF) 11 Page - Integrated Device Technology

Part # ICS8535BKI-01LF
Description  LOW SKEW, 1-to-4 LVCMOS/LVTTL-TO- 3.3V LVPECL FANOUT BUFFER
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

ICS8535BKI-01LF Datasheet(HTML) 11 Page - Integrated Device Technology

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IDT/ ICS3.3V LVPECL FANOUT BUFFER
11
ICS8535BGI-01 REV. A NOVEMBER 9, 2007
ICS8535BI-01
LOW SKEW, 1-to-4 LVCMOS/LVTTL-TO-3.3V LVPECL FANOUT BUFFER
PRELIMINARY
3. Calculations and Equations.
The purpose of this section is to derive the power dissipated into the load.
LVPECL output driver circuit and termination are shown in Figure 4.
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
– 0.9V
(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 - 0.9V)/50
Ω] * 0.9V = 19.8mW
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 = 30mW
FIGURE 4. LVPECL DRIVER CIRCUIT AND TERMINATION
Q1
V
OUT
V
CC
RL
50
V
CC - 2V


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