ICS853017AMLFT View Datasheet(PDF) - Integrated Device Technology

Part Name

Description

MFG CO.

ICS853017AMLFT

QUAD, 1-TO-1, DIFFERENTIAL-TO-2.5V, 3.3V, 5V LVPECL RECEIVER

Integrated Device Technology 

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ICS853017

QUAD, 1-TO-1, DIFFERENTIAL-TO-2.5V, 3.3V, 5V LVPECL/ECL RECEIVER

3. Calculations and Equations.

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

VCC

PRELIMINARY

Q1

VOUT

RL

50

VCC - 2V

FIGURE 6. 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 of V - 2V.

CC

• For logic high, V = V = V – 0.935V

OUT

OH_MAX

CC_MAX

(V - V ) = 0.935V

CC_MAX

OH_MAX

• For logic low, V = V = V – 1.67V

OUT

OL_MAX

CC_MAX

(V - V ) = 1.67V

CC_MAX

OL_MAX

Pd_H = [(V – (V - 2V))/R ] * (V - V ) = [(2V - (V - V ))/R ] * (V - V ) =

OH_MAX

CC_MAX

L

CC_MAX

OH_MAX

CC_MAX

OH_MAX

L

CC _MAX

OH_MAX

[(2V - 0.935V)/50Ω] * 0.935V = 19.92mW

Pd_L = [(V – (V - 2V))/R ] * (V - V ) = [(2V - (V - V ))/R ] * (V - V ) =

OL_MAX

CC_MAX

L

CC_MAX

OL_MAX

CC_MAX

OL_MAX

L

CC_MAX

OL_MAX

[(2V - 1.67V)/50Ω] * 1.67V = 11.02mW

Total Power Dissipation per output pair = Pd_H + Pd_L = 30.94mW

IDT™ / ICS™ 2.5V, 3.3V, 5V LVPECL/ECL RECEIVER

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ICS853017AM REV. B OCTOBER 24, 2007

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