SI53305 Datasheet, PDF (13/36 Pages) Silicon Laboratories – 1:10 LOW JITTER UNIVERSAL BUFFER/LEVEL TRANSLATOR WITH 2:1 INPUT MUX AND INDIVIDUAL OE

Si53305
DC Coupled LVPECL Termination Scheme 1
VDDO _{= 3.3 V or 2.5 V}
“Standard”
50
LVPECL
Driver
50
VDDO
R1
R1
CLKx
CLKx
VDD
Si 53305
3.3 V LVPECL: R1 = 127 Ohm, R2 = 82. 5 Ohm
2.5 V LVPECL: R1 = 250 Ohm, R2 = 62. 5 Ohm
R2
R2
VTERM = VDDO – 2V
R1 // R2 = 50 Ohm
DC Coupled LVPECL Termination Scheme 2
VDDO _{= 3.3 V or 2.5 V}
“Standard”
50
LVPECL
Driver
50
50
50
VDD
CLKx
CLKx
Si 53305
DC Coupled LVDS Termination
VDDO _{= 3.3 V or 2.5 V}
Standard
50
LVDS
Driver
50
VTERM = VDDO – 2V
CLKx
CLKx
VDD
Si 53305
100
DC Coupled HCSL Termination Scheme
VDDO _{= 3.3V}
33
50
Standard
HCSL Driver
33
50
50
50
CLKx
CLKx
VDD
Si 53305
Note: 33 Ohm series termination is optional depending on the location of the receiver.
Figure 4. Differential DC-Coupled Input Terminations
Rev. 1.0
13