ICS85356AGI IDT, Integrated Device Technology Inc, ICS85356AGI Datasheet - Page 10

• Manufacturer Part Number: ICS85356AGI
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Clock Multiplexerr

Specifications of ICS85356AGI

• Number Of Clock Inputs: 4/2
• Mode Of Operation: Differential
• Output Frequency: 900MHz
• Output Logic Level: ECL/LVPECL
• Operating Supply Voltage (min): -3/3V
• Operating Supply Voltage (typ): -3.3/3.3V
• Operating Supply Voltage (max): -3.8/3.6V
• Package Type: TSSOP
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 20
• Lead Free Status / RoHS Status: Not Compliant

ICS85356I 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 4.
Figure 4. 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
ICS85356AMI REVISION B MAY 10, 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
OH_MAX
OL_MAX
CC_MAX
CC_MAX
OUT
OUT
= V
V
= V
) = 1.7V
) = 0.9V
Q1
CC
– 2V))/R
– 2V))/R
OL_MAX
OH_MAX
L
= V
L
] * (V
] * (V
= V
CC_MAX
CC_MAX
CC_MAX
CC_MAX
RL
50Ω
V
– 1.7V
CC
– 0.9V
– V
– V
-
2V
V
OUT
OL_MAX
OH_MAX
) = [(2V – (V
) = [(2V – (V
10
CC_MAX
CC_MAX
2:1, DIFFERENTIAL-TO-3.3V LVPECL/ECL CLOCK MULTIPLEXER
– V
– V
OL_MAX
OH_MAX
))/R
))/R
L]
L
* (V
] * (V
CC_MAX
©2010 Integrated Device Technology, Inc.
CC_MAX
– V
– V
OL_MAX
OH_MAX
) =
) =