PI6C5946002ZHIE datasheet(8/12 Pages) PERICOM

Part #	PI6C5946002ZHIE

Description	6 GHz / 12 Gbps Clock / Data Fanout Buffer with Internal Termination

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Manufacturer	PERICOM [Pericom Semiconductor Corporation]

Direct Link	http://www.pericom.com

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8

PI6C5946002 Rev A

11/04/14

PI6C5946002

6 GHz / 12 Gbps Clock / Data Fanout Buffer with Internal Termination

CML and LVDS Input Interface

LVPECL and LVDS DC Input

LVPECL and LVDS clock input to this IC is connected as shown

in the Fig. 3.

LVPECL and LVDS AC Input

LVPECL and LVDS AC drive to this clock IC requires the use of

the VREF-AC output to recover the DC bias for the IC input as

shown in Fig. 4

CML AC-Coupled Input

CML AC-coupled drive requires a connection to VREF-AC as

shown in Fig. 5. The CML DC drive is not recommended as

different vendors have different CML DC voltage level. CML

is mostly used in AC coupled drive configuration for data and

clock signals.

Fig 3: CML/ LVDS Input

Fig 4: CML/ LVDS AC Coupled Input

Fig 5: CML AC-Coupled Input Interface

HCSL AC-Coupled Input

It is suggested to use AC coupling to buffer PCIe HCSL 100MHz

clock since its V_cm is relatively low at about 0.4V, as shown in

Fig. 6.

CMOS Clock DC Drive Input

LVCMOS clock has voltage Voh levels such as 3.3V, 2.5V, 1.8V.

CMOS drive requires a Vcm design at the input: Vcm= ½

(CMOS V) as shown in Fig. 7. Rs =22 ~33ohm typically.

Fig 6: HCSL AC-Coupled Input Interface

Fig 7: CMOS DC Input Vcm Design

Device IC

+ -

Zo =100

*150

LVPECL Drive

REF_IN+

REF_IN-

VTH

VREF-AC

50

*150 removed for LVDS

Device IC

+ -

Zo =100

REF_IN+

REF_IN-

VTH

VREF-AC

50

VDD

0.01uf

0.01u

LVPECL Drive

*150

*150 removed for LVDS

Device IC

+ -

Zo =100

CML

REF_IN+

REF_IN-

VTH

VREF-AC

50

CML AC-Coupled

VDD

0.01uf

0.01u

Device IC

+ -

Zo =100

REF_IN+

REF_IN-

VTH

VREF-AC

50

VDD

0.01uf

0.01u

33

HCSL

PCIe Ref_CLK

50

CMOS Driver

3.3V, 2.5V, 1.8V

Rs

Zo

Ro

REF_IN+

REF_IN-

VDD

3.3V

0.1u

Rup

Rdn

Vcm design

Vcm

CMOS V

Rup

Rdn

Vcm

3.3V

1k

1.65V

2.5V

1k

610

1.25V

1.8V

1k

380

0.9V

Diff. Input

VTH

VREF-AC

14-0180

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PI6C5946002ZHIE Datasheet(PDF) 8 Page - Pericom Semiconductor Corporation

PI6C5946002ZHIE Datasheet(HTML) 8 Page - Pericom Semiconductor Corporation

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