ICS8533AGI-31 IDT, Integrated Device Technology Inc, ICS8533AGI-31 Datasheet - Page 13

• Manufacturer Part Number: ICS8533AGI-31
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Clock Driverr

Specifications of ICS8533AGI-31

• Number Of Clock Inputs: 2
• Mode Of Operation: Differential
• Output Frequency: 650MHz
• Output Logic Level: LVPECL
• Operating Supply Voltage (min): 3.135V
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.465V
• Package Type: TSSOP
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 20
• Lead Free Status / RoHS Status: Supplier Unconfirmed

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 7.
Figure 7. 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
ICS8533I-31
LOW SKEW, 1-TO-4, CRYSTAL OSCILLATOR/DIFFERENTIAL-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
CCO_MAX
CC_MAX
OUT
OUT
= V
V
= V
) = 1.7V
) = 0.9V
Q1
CCO
– 2V))/R
OL_MAX
– 2V))/R
OH_MAX
L
= V
L
] * (V
= V
] * (V
CC_MAX
CC_MAX
CC_MAX
CC_MAX
RL
50Ω
V
– 1.7V
CCO
– 0.9V
– V
– V
-
V
2V
OUT
OH_MAX
OL_MAX
) = [(2V – (V
) = [(2V – (V
13
CC_MAX
CC_MAX
– V
– V
OH_MAX
OL_MAX
ICS8533AGI-31 REV. A DECEMBER 13, 2007
))/R
))/R
L
L]
] * (V
* (V
CC_MAX
CC_MAX
– V
– V
OH_MAX
OL_MAX
PRELIMINARY
) =
) =