PI6C5916004ZHIE datasheet(9/12 Pages) PERICOM

Part #	PI6C5916004ZHIE

Description	6 GHz 1:4 LVPECL Fanout Buffer with Internal Termination

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Manufacturer	PERICOM [Pericom Semiconductor Corporation]

Direct Link	http://www.pericom.com

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9

PI6C5916004 Rev C

10/27/2014

PI6C5916004

6 GHz 1:4 LVPECL Fanout Buffer with Internal Termination

Device LVPECL Output Terminations

LVPECL Output Popular Termination

The most popular LVPECL termination is 150ohm pull-down

bias and 100ohm across at RX side. Please consult ASIC data-

sheet if it already has 100ohm or equivalent internal termina-

tion. If so, do not connect external 100ohm across as shown in

Fig. 8. This popular termination’s advantage is that it does not

allow any bias through from VDD. This prevents VDD system

noise coupling onto clock trace.

LVPECL Output Thevenin Termination

Fig. 9 shows LVPECL output Thevenin termination which is

used for shorter trace drive (<5in.), but it takes VDD bias current

and VDD noise can get onto clock trace. It also requires more

component count. So it is seldom used today.

Fig. 8 LVPECL Output Popular Termination

Fig. 9 LVPECL Thevenin Output Termination

LVPECL Output AC Thevenin Termination

LVPECL AC Thevenin terminations require a 150ohm pull-

down before the AC coupling capacitor at the source as shown

in Fig. 10. Note that pull-up/down resistor value is swapped

compared to Fig. 9. This circuit is good for short trace (<5in.)

application only.

LVPECL Output Drive HCSL Input

Using the LVPECL output to drive a HCSL input can be done

using a typical LVPECL AC Thenvenin termination scheme.

Use pull-up/down 450/60ohm to generate Vcm=0.4V for the

HCSL input clock. This termination is equivalent to 50Ohm

load as shown in Fig. 11.

Fig. 11 LVPECL Output Drive HCSL Termination

Fig. 10 LVPECL Output AC Thenvenin Termination

14-0181

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PI6C5916004ZHIE Datasheet(PDF) 9 Page - Pericom Semiconductor Corporation

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