ICS853052AM datasheet(10/13 Pages) ICST

10 / 13 page

853052AG

www.icst.com/products/hiperclocks.html

REV. A JULY 1, 2004

Integrated

Circuit

Systems, Inc.

ICS853052

DUAL LVCMOS / LVTTL-TO-DIFFERENTIAL

2.5V, 3.3V, 5V LVPECL MULTIPLEXER

PRELIMINARY

3. Calculations and Equations.

LVPECL output driver circuit and termination are shown in Figure 4.

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 4. LVPECL Driver Circuit and Termination

VOUT

VCC - 2V

VCC

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