SI53306 Datasheet, PDF (12/29 Pages) Silicon Laboratories – 1:4 LOW-JITTER UNIVERSAL BUFFER/LEVEL TRANSLATOR

Si53306
VDDO
DC Coupled LVPECL Termination Scheme 1
VDDO _{= 3.3V or 2.5V}
R1
R1
“Standard”
50
LVPECL
Driver
50
CLKx
/CLKx
VDD
Si533xx
3.3V LVPECL: R1 = 127 Ohm, R2 = 82.5 Ohm
2.5V LVPECL: R1 = 250 Ohm, R2 = 62.5 Ohm
R2
R2
VTERM = VDDO – 2V
R1 // R2 = 50 Ohm
DC Coupled LVPECL Termination Scheme 2
VDDO _{= 3.3V or 2.5V}
“Standard”
50
LVPECL
Driver
50
50
50
CLKx
/CLKx
VDD
Si533xx
VTERM = VDDO – 2V
DC Coupled LVDS Termination
VDDO = 3.3V or 2.5V
Standard
50
LVDS
Driver
50
CLKx
/CLKx
100
VDD
Si533xx
DC Coupled HCSL Source Termination Scheme
VDDO _{= 3.3V}
33
Standard
HCSL Driver
33
50
CLKx
/CLKx
50
VDD
Si533xx
50
50
Note: 33 Ohm series termination is optional depending on the location of the receiver.
Figure 4. Differential DC-Coupled Input Terminations
12
Rev. 1.0