ICS85222-02 查看數據表（PDF） - Integrated Device Technology

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ICS85222-02

1-TO-2, LVCMOS/LVTTL-TO-DIFFERENTIAL HSTL TRANSLATOR

Integrated Device Technology 

ICS85222-02

1-TO-2, LVCMOS/LVTTL-TO-DIFFERENTIAL HSTL TRANSLATOR

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 1.

V

DD

Q1

VOUT

RL

50Ω

FIGURE 1. HSTL DRIVER CIRCUIT AND TERMINATION

To calculate worst case power dissipation into the load, use the following equations which assume a 50Ω 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 /R ) * (V - V )

OH_MAX L

DD_MAX

OH_MAX

Pd_L = (V /R ) * (V - V )

OL_MAX L

DD_MAX

OL_MAX

Pd_H = (1.4V/50Ω) * (3.465V - 1.4V) = 57.8mW

Pd_L = (0.4V/50Ω) * (3.465V - 0.4V) = 24.52mW

Total Power Dissipation per output pair = Pd_H + Pd_L = 82.3mW

IDT™ / ICS™ DIFFERENTIAL HSTL TRANSLATOR

7

ICS85222AM-02 REV. B SEPTEMBER 12, 2007

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