Datasheet > 8537AY-01

8537AY-01

更新时间： 2024-01-10 09:18:29

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艾迪悌 - IDT		/
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8537AY-01 数据手册

ICS8537-01

HEX, LOW SKEW, 1-TO-2

DIFFERENTIAL-TO-3.3V/2.5V LVPECL CLOCK BUFFER

3. Calculations and Equations.

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

LVPECL output driver circuit and termination are shown in Figure 3.

V_CCO

V_OUT

R L

V_CCO- 2V

FIGURE 3. LVPECL DRIVER CIRCUIT AND TERMINATION

To calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load, and a termination

voltage ofV - 2V.

CCO

•

For logic high, V_OUT= V

= V

– 0.9V

OH_MAX

CCO_MAX

)

= 0.9V

OH_MAX

- V

CCO_MAX

For logic low, V_OUT= V

= V

– 1.7V

OL_MAX

CC_MAX

)

= 1.7V

OL_MAX

- V

CC_MAX

Pd_H is power dissipation when the output drives high.

Pd_L is the power dissipation when the output drives low.

))

Pd_H = [(V

– (V

- 2V))/R ] * (V

- V

) = [(2V - (V

- V

/R ] * (V

- V ) =

OH_MAX

CCO_MAX

OH_MAX

CCO_MAX

OH_MAX

CCO_MAX

[(2V - 0.9V)/50Ω] * 0.9V = 19.8mW

))

Pd_L = [(V

– (V

- 2V))/R ] * (V

- V

) = [(2V - (V

- V

/R ] * (V

- V

) =

OL_MAX

CCO_MAX

OL_MAX

CCO_MAX

OL_MAX

CCO_MAX

OL_MAX

[(2V - 1.7V)/50Ω] * 1.7V = 10.2mW

Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW

8537AY-01

www.idt.com

REV.B NOVEMBER 22, 2010

1...6 7 8910 11 12...14

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