ICS85222AM-02LFT View Datasheet(PDF) - Integrated Circuit Systems

Part Name

Description

MFG CO.

ICS85222AM-02LFT

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

Integrated Circuit Systems 

1 2 3 4 5 6 7 8 9 10

Integrated

Circuit

Systems, Inc.

PRELIMINARY

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.

VDD

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_MIN L

DD_MAX OH_MIN

Pd_L = (V

/R ) * (V

-V )

OL_MAX L

DD_MAX OL_MAX

Pd_H = (1V/50Ω) * (3.465V - 1V) = 49.3mW

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

Total Power Dissipation per output pair = Pd_H + Pd_L = 73.8mW

85222AM-02

www.icst.com/products/hiperclocks.html

7

REV. A JANUARY 25, 2006

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