ICS8535AGI-31LF datasheet(11/15 Pages) IDT

Part #	ICS8535AGI-31LF

Description	LOW SKEW, 1-TO-4, CRYSTAL OSCILLATOR/LVCMOS-TO-3.3V LVPECL FANOUT BUFFER

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Manufacturer	IDT [Integrated Device Technology]

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11 / 15 page

ICS8535I-31

LOW SKEW, 1-TO-4, CRYSTAL OSCILLATOR/LVCMOS-TO-3.3V LVPECL FANOUT BUFFER

IDT™ / ICS™ 3.3V LVPECL FANOUT BUFFER

11

ICS8535AGI-31 REV. A AUGUST 16, 2007

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 5.

Figure 5. LVPECL Driver Circuit and Termination

To calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load, and a termination voltage

of VCC – 2V.

•

For logic high, VOUT = VOH_MAX = VCC_MAX – 0.9V

(VCC_MAX – VOH_MAX) = 0.9V

•

For logic low, VOUT = VOL_MAX = VCC_MAX – 1.7V

(VCC_MAX – VOL_MAX) = 1.7V

Pd_H is power dissipation when the output drives high.

Pd_L is the power dissipation when the output drives low.

Pd_H = [(VOH_MAX – (VCC_MAX – 2V))/RL] * (VCC_MAX – VOH_MAX) = [(2V - (VCC_MAX – VOH_MAX))/RL] * (VCC_MAX – VOH_MAX) =

[(2V - 0.9V)/50

Ω] * 0.9V = 19.8mW

Pd_L = [(VOL_MAX – (VCC_MAX – 2V))/RL] * (VCC_MAX – VOL_MAX) = [(2V – (VCC_MAX – VOL_MAX))/RL] * (VCC_MAX – VOL_MAX) =

[(2V – 1.7V)/50

Ω] * 1.7V = 10.2mW

Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW

V

OUT

V

CC

V

CC - 2V

Q1

RL

50

Ω

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ICS8535AGI-31LF Datasheet(PDF) 11 Page - Integrated Device Technology

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