Savvio 15K SAS Product Manual, Rev. B
9.5.2.3.4 Impedance specifications
Table 21 defines impedance requirements.
Table 21: Impedance requirements (Sheet 1 of 2)
Requirement Units 1.5 Gbps 3.0 Gbps
Time domain reflectometer rise time 20 % to 80 %
a,b
ps 100 50
Media (PCB or cable)
Differential impedance
b,c,d
ohm 100 ± 10 100 ± 10
Differential impedance imbalance
b,c,d,g
ohm 5 5
Common mode impedance
b,c,d
ohm 32.5 ± 7.5 32.5 ± 7.5
Mated connectors
Differential impedance
b,c,d
ohm 100 ± 15 100 ± 15
Differential impedance imbalance
b,c,d,g
ohm 5 5
Common mode impedance
b,c,d
ohm 32.5 ± 7.5 32.5 ± 7.5
Receiver termination
Differential impedance
b,e,f
ohm 100 ± 15 100 ± 15
Differential impedance imbalance
b,e,f,g
ohm 5 5
Receiver termination time constant
b,e,f
ps 150 max 100 max
Common mode impedance
b,e
ohm 20 min/40 max 20 min/40 max
Transmitter source termination
Differential impedance
b
ohm 60 min/115 max 60 min/115 max
Differential impedance imbalance
b,g
ohm 5 5
Common mode impedance
b
ohm 15 min/40 max 15 min/40 max
