ICS853013AM datasheet(13/17 Pages) ICST

Numer części	ICS853013AM

Szczegółowy opis	LOW SKEW, DUAL, 1-TO-3, DIFFERENTIAL-TO-2.5V/3.3V/5V LVPECL/ECL FANOUT BUFFER

PDF	17 Pages

Scroll/Zoom	100%

Producent	ICST [Integrated Circuit Systems]

Strona internetowa	http://www.icst.com

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13 / 17 page

853013AM

www.icst.com/products/hiperclocks.html

REV. A OCTOBER 19, 2005

Integrated

Circuit

Systems, Inc.

ICS853013

LOW SKEW, DUAL, 1-TO-3, DIFFERENTIAL-TO-

2.5V/3.3V/5V LVPECL/ECL FANOUT BUFFER

3. Calculations and Equations.

LVPECL output driver circuit and termination are shown in Figure 5.

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

– 0.935V

CC_MAX

- V

OH_MAX

) = 0.935V

•

For logic low, V

OUT

= V

OL_MAX

= V

CCO_MAX

– 1.67V

CCO_MAX

- V

OL_MAX

) = 1.67V

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 - 0.935V)/50

Ω] * 0.935V = 19.92mW

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 - 1.67V)/50

Ω] * 1.67V = 11.02mW

Total Power Dissipation per output pair = Pd_H + Pd_L = 30.94mW

Figure 5. LVPECL Driver Circuit and Termination

VCCO - 2V

VOUT

VCCO

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