853S9252BKILF IDT, 853S9252BKILF Datasheet - Page 15

• Manufacturer Part Number: 853S9252BKILF
• Description: Clock Drivers & Distribution
• Manufacturer: IDT

Specifications of 853S9252BKILF

• Product Category: Clock Drivers & Distribution
• Rohs: yes
• Part # Aliases: ICS853S9252BKILF

ICS853S9252I Data Sheet
3. Calculations and Equations.
The purpose of this section is to calculate the power dissipation for the LVPECL output pairs.
The LVPECL output driver circuit and termination are shown in Figure 8.
Figure 8. LVPECL Driver Circuit and Termination
T
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 – 0.76V)/50Ω] * 0.76V = 18.8mW
Pd_L = [(V
[(2V – 1.6V)/50Ω] * 1.6V = 12.8mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 31.6mW
ICS853S9252BKI REVISION A JULY 29, 2011
o calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load, and a termination voltage of
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
OUT
Q1
= V
= V
) = 1.6V
) = 0.76V
– 2V))/R
V
– 2V))/R
CC
OL_MAX
OH_MAX
L
= V
L
] * (V
] * (V
= V
CC_MAX
CC_MAX
CC_MAX
CC_MAX
RL
50Ω
V
– 1.6V
CC
V
– 0.76V
– V
– V
OUT
- 2V
OL_MAX
OH_MAX
) = [(2V – (V
) = [(2V – (V
15
CC_MAX
CC_MAX
– V
– V
OL_MAX
OH_MAX
))/R
2.5V, 3.3V ECL/LVPECL CLOCK/DATA FANOUT BUFFER
))/R
L]
L
* (V
] * (V
CC_MAX
CC_MAX
©2011 Integrated Device Technology, Inc.
– V
– V
OL_MAX
OH_MAX
) =
) =