ICS853111AV-01T datasheet(11/15 Pages) ICST

Part #	ICS853111AV-01T

Description	LOW SKEW, 1-TO-9 DIFFERENTIAL-TO-3.3V LVPECL/ECL FANOUT BUFFER

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Manufacturer	ICST [Integrated Circuit Systems]

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11 / 15 page

853111AV-01

www.icst.com/products/hiperclocks.html

REV. A APRIL 25, 2005

11

Integrated

Circuit

Systems, Inc.

ICS853111-01

LOW SKEW, 1-TO-9

DIFFERENTIAL-TO-3.3V 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

(V

CCO_MAX

- V

OH_MAX

) = 0.935V

•

For logic low, V

OUT

= V

OL_MAX

= V

CCO_MAX

– 1.67V

(V

CCO_MAX

- V

OL_MAX

) = 1.67V

Pd_H is power dissipation when the output drives high.

Pd_L is the power dissipation when the output drives low.

Pd_H = [(V

OH_MAX

– (V

CCO_MAX

- 2V))/R

L

] * (V

CCO_MAX

- V

OH_MAX

) = [(2V - (V

CCO_MAX

- V

OH_MAX

))/R

L

] * (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

L

] * (V

CCO_MAX

- V

OL_MAX

) = [(2V - (V

CCO_MAX

- V

OL_MAX

))/R

L

] * (V

CCO_MAX

- V

OL_MAX

) =

[(2V - 1.67V)/50

Ω] * 1.67V = 11.2mW

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

Figure 5. LVPECL Driver Circuit and Termination

VCCO - 2V

Q1

VOUT

RL

50

VCCO

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