ICS853017AM datasheet(12/15 Pages) IDT

12 / 15 page

IDT™ / ICS™ 2.5V, 3.3V, 5V LVPECL/ECL RECEIVER

ICS853017AM REV. B OCTOBER 24, 2007

ICS853017

QUAD, 1-TO-1, DIFFERENTIAL-TO-2.5V, 3.3V, 5V LVPECL/ECL RECEIVER

PRELIMINARY

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

- 2V.

•

For logic high, V

OUT

= V

OH_MAX

= V

CC_MAX

– 0.935V

CC_MAX

- V

OH_MAX

) = 0.935V

•

For logic low, V

OUT

= V

OL_MAX

= V

CC_MAX

– 1.67V

CC_MAX

- V

OL_MAX

) = 1.67V

Pd_H = [(V

OH_MAX

– (V

CC_MAX

- 2V))/R

] * (V

CC_MAX

- V

OH_MAX

) = [(2V - (V

CC_MAX

- V

OH_MAX

))/R

] * (V

CC _MAX

- V

OH_MAX

) =

[(2V - 0.935V)/50

Ω] * 0.935V = 19.92mW

Pd_L = [(V

OL_MAX

– (V

CC_MAX

- 2V))/R

] * (V

CC_MAX

- V

OL_MAX

) = [(2V - (V

CC_MAX

- V

OL_MAX

))/R

] * (V

CC_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 6. LVPECL Driver Circuit and Termination

VOUT

VCC - 2V

VCC

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