SI53340-45 Datasheet, PDF (5/38 Pages) Silicon Laboratories – Multiple configuration options

Si53340-45 Data Sheet
Functional Description
DC Coupled LVPECL Input Termination Scheme 1
R1
VDD _{= 3.3 V or 2.5 V}
“Standard”
50
LVPECL
Driver
50
VDD
R1
CLKx
CLKxb
VDD
Si53340/42/44
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 = VDD – 2V
R1 // R2 = 50 Ohm
DC Coupled LVPECL Input Termination Scheme 2
VDD _{= 3.3 V or 2.5 V}
“Standard”
50
LVPECL
Driver
50
50
50
VDD
CLKx
CLKxb
Si53340/42/44
DC Coupled LVDS Input Termination
VDD _{= 3.3 V or 2.5 V}
Standard
50
LVDS
Driver
50
VTERM = VDD – 2 V
100
VDD
CLKx
CLKxb
Si53340/42/44
DC Coupled HCSL Input Termination Scheme
VDD _{= 3.3 V}
33
50
Standard
HCSL Driver
33
50
50
50
VDD
CLKx
CLKxb
Si53340/42/44
Note: 33 Ohm series termination is optional depending on the location of the receiver.
Figure 2.3. Differential DC-Coupled Input Terminations
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