8535AGI-21LF IDT, 8535AGI-21LF Datasheet - Page 11

• Manufacturer Part Number: 8535AGI-21LF
• Description: Clock Drivers & Distribution
• Manufacturer: IDT

Specifications of 8535AGI-21LF

• Product Category: Clock Drivers & Distribution
• Rohs: yes
• Part # Aliases: ICS8535AGI-21LF

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.
Figure 4. LVPECL Driver Circuit and Termination
T
of V
Pd_H is power dissipation when the output drives high.
Pd_L is the power dissipation when the output drives low.
Pd_H = [(V
[(2V – 0.9V)/50Ω] * 0.9V = 19.8mW
Pd_L = [(V
[(2V – 1.7V)/50Ω] * 1.7V = 10.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW
IDT™ / ICS™ 3.3V LVPECL FANOUT BUFFER
o calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load, and a termination voltage
ICS8535I-21
LOW SKEW, 1-TO-2 LVCMOS/LVTTL-TO-3.3V LVPECL FANOUT BUFFER
CC
•
•
– 2V.
For logic high, V
(V
For logic low, V
(V
OL_MAX
OH_MAX –
CC_MAX
CC_MAX
– (V
– V
– V
(V
OH_MAX
OL_MAX
CC_MAX
CC_MAX
OUT
V
OUT
Q1
CC
= V
= V
) = 1.7V
) = 0.9V
– 2V))/R
– 2V))/R
OL_MAX
OH_MAX
L
L
= V
] * (V
] * (V
= V
CC_MAX
CC_MAX
CC_MAX
RL
50Ω
CC_MAX
V
CC
-
2V
V
– 1.7V
OUT
– 0.9V
– V
– V
OL_MAX
OH_MAX
) = [(2V – (V
) = [(2V – (V
11
CC_MAX
CC_MAX
– V
– V
OL_MAX
OH_MAX
ICS8535AGI-21 REV. A NOVEMBER 24, 2008
))/R
))/R
L
L
] * (V
] * (V
CC_MAX
CC_MAX
– V
– V
OL_MAX
OH_MAX
) =
) =