SI53323 datasheet(8/23 Pages) SILABS

Part #	SI53323

Description	1:4 LOW-JITTER LVPECL CLOCK BUFFER WITH 2:1 INPUT MUX

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Manufacturer	SILABS [Silicon Laboratories]

Direct Link	http://www.silabs.com

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Si53323

8

Rev. 1.0

Figure 4. Differential DC-Coupled Input Terminations

VDD

Si533xx

R1

VDD

R2

R1

R2

“Standard”

LVPECL

Driver

VTERM = VDD – 2V

R1 // R2 = 50 Ohm

CLKx

= 3.3V or 2.5V

VDD

3.3V LVPECL:

R1 = 127 Ohm, R2 = 82.5 Ohm

2.5V LVPECL:

R1 = 250 Ohm, R2 = 62.5 Ohm

DC Coupled LVPECL Termination Scheme 1

/CLKx

50

VDD

Si533xx

50

VTERM = VDD – 2V

= 3.3V or 2.5V

VDD

50

“Standard”

LVPECL

Driver

CLKx

/CLKx

DC Coupled LVPECL Termination Scheme 2

VDD

Si533xx

50

DC Coupled LVDS Termination

= 3.3V or 2.5V

VDD

100

Standard

LVDS

Driver

CLKx

/CLKx

VDD

Si533xx

50

DC Coupled HCSL Source Termination Scheme

= 3.3V

VDD

Standard

HCSL Driver

50

33

CLKx

/CLKx

Note: 33 Ohm series termination is optional depending on the location of the receiver.

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