ICS8741004

DIFFERENTIAL-TO-LVDS/0.7V DIFFERENTIAL PCI EXPRESS™ JITTER ATTENUATOR

IDT™ / ICS™ PCI EXPRESS™ JITTER ATTENUATOR

14

ICS8741004AG REV. AAUGUST 3, 2007

3. Calculations and Equations.

The purpose of this section is to calculate power dissipation on the IC per HCSL output pair.

HCSL output driver circuit and termination are shown in Figure 6.

Figure 6. LVHSTL Driver Circuit and Termination

Pd_H is power dissipation when the output drives high.

Pd_L is the power dissipation when the output drives low.

Pd_H = (0.85V/50

Ω) * (3.465V – 0.87V) = 44.1mW

Pd_L = (0.15V/50

Ω) * 0.15V = 0.45mW

Total Power Dissipation per output pair = Pd_H + Pd_L = 45mW

IC

VOU T

RL

50

VDD O