85222AM

www.icst.com/products/hiperclocks.html

REV. B MARCH 31, 2005

8

Integrated

Circuit

Systems, Inc.

ICS85222

3. Calculations and Equations.

The purpose of this section is to derive the power dissipated into the load.

LVHSTL output driver circuit and termination are shown in

Figure 2.

Ω load.

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

/R

L

) * (V

DD_MAX

- V

OH_MAX

)

Pd_L = (V

OL_MAX

/R

L

) * (V

DD_MAX

- V

OL_MAX

)

Pd_H = (1.2V/50

Ω) * (3.465V - 1.2V) = 54.4mW

Pd_L = (0.4V/50

Ω) * (3.465V - 0.4V) = 24.52mW

Total Power Dissipation per output pair = Pd_H + Pd_L = 78.9mW

V

DD

V

OUT

RL

50

Ω

Q1