8421004AGI-01

www.icst.com/products/hiperclocks.html

REV. A MACH 29, 2005

10

Integrated

Circuit

Systems, Inc.

ICS8421004I-01

PRELIMINARY

3. Calculations and Equations.

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

HSTL output driver circuit and termination are shown in

Figure 3.

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_MIN

/R

L

) * (V

DD_MAX

- V

OH_MIN

)

Pd_L = (V

OL_MAX

/R

L

) * (V

DD_MAX

- V

OL_MAX

)

Pd_H = (1V/50

Ω) * (2V - 1V) = 20mW

Pd_L = (0.4V/50

Ω) * (2V - 0.4V) = 12.8mW

Total Power Dissipation per output pair = Pd_H + Pd_L = 32.8mW

V

DDO

V

OUT

RL

50

Ω

Q1