AnsweredAssumed Answered

Characteristic Impedance of 60x bus of MPC8270 for PCB Stackup and Routing

Question asked by Muhammad Ahmed on Mar 15, 2018
Latest reply on Mar 19, 2018 by Muhammad Ahmed

Hi,  i am routing 60x bus of MPC8270 at 100Mhz for SDRAM interfacing and PCI bus also.

In data sheet of MPC8270 output buffer impedances are given as follows: 

Are these also characteristic impedance of PCB Track or these are just output impedances and i need to change my PCB Track impedance. Like when we route USB Signals we must make sure that the differential impedance of PCB Track must be 90 ohm. So what is the characteristic impedance of 60x / local and PCI bus.  

Thanks

Outcomes