ICS8536-02 IDT [Integrated Device Technology], ICS8536-02 Datasheet - Page 14

• Manufacturer Part Number: ICS8536-02
• Description: Low Skew, 1-to-6, Dual Crystal/LVCMOS-to-3.3V, 2.5V LVPECL Fanout Buffer
• Manufacturer: IDT [Integrated Device Technology]

ICS8536-02 Data Sheet
3. Calculations and Equations.
The purpose of this section is to calculate the power dissipation for the LVPECL output pair.
LVPECL output driver circuit and termination are shown in Figure 6.
Figure 6. 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 – 0.9V)/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
ICS8536AG-02 REVISION A JULY 21, 2010
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
CC_MAX
OH_MAX
OL_MAX
CC_MAX
OUT
OUT
= V
– 2V))/R
V
= V
) = 1.7V
Q1
CC
) = 0.9V
– 2V))/R
OL_MAX
OH_MAX
L
] * (V
= V
L
] * (V
= V
CC_MAX
CC_MAX
CC_MAX
CC_MAX
RL
50Ω
V
– V
CC
– 1.7V
– 0.9V
-
– V
2V
OL_MAX
V
OUT
OH_MAX
) = [(2V – (V
) = [(2V – (V
14
CC_MAX
1-TO-6, DUALCRYSTAL/LVCMOS-TO-3.3V, 2.5V LVPECL FANOUT BUFFER
CC_MAX
– V
– V
OL_MAX
OH_MAX
))/R
))/R
L
] * (V
L
] * (V
CC_MAX
©2010 Integrated Device Technology, Inc.
CC_MAX
– V
OL_MAX
– V
OH_MAX
) =
) =