ICS85310AI11L datasheet(12/16 Pages) ICST

12 / 16 page

85310AYI-11

www.icst.com/products/hiperclocks.html

REV. E JULY 7, 2005

Integrated

Circuit

Systems, Inc.

ICS85310I-11

LOW SKEW, 1-TO-10

DIFFERENTIAL-TO-2.5V/3.3V ECL/LVPECL FANOUT BUFFER

3. Calculations and Equations.

LVPECL output driver circuit and termination are shown in Figure 6.

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

Ω load, and a termination

voltage of V

CCO

- 2V.

•

For logic high, V

OUT

= V

OH_MAX

= V

CCO_MAX

– 1.0V

CCO_MAX

- V

OH_MAX

) = 1.0V

•

For logic low, V

OUT

= V

OL_MAX

= V

CCO_MAX

– 1.7V

CCO_MAX

- V

OL_MAX

) = 1.7V

Pd_H = [(V

OH_MAX

– (V

CCO_MAX

- 2V))/R

] * (V

CCO_MAX

- V

OH_MAX

) = [(2V - (V

CCO_MAX

- V

OH_MAX

))/R

] * (V

CCO _MAX

- V

OH_MAX

) =

[(2V - 1V)/50

Ω] * 1V = 20.0mW

Pd_L = [(V

OL_MAX

– (V

CCO_MAX

- 2V))/R

] * (V

CCO_MAX

- V

OL_MAX

) = [(2V - (V

CCO_MAX

- V

OL_MAX

))/R

] * (V

CCO_MAX

- V

OL_MAX

) =

[(2V - 1.7V)/50

Ω] * 1.7V = 10.2mW

Total Power Dissipation per output pair = Pd_H + Pd_L = 30.2mW

Figure 6. LVPECL Driver Circuit and Termination

OUT

CCO

CCO - 2V

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