SCSI Physical Characteristics
Chapter 5
Technical Reference Manual
Page 63
J5 Auxiliary Connector Signal Characteristics
Table 5-17
J5 Auxiliary Interface Electrical Characteristics
State
Current
Voltage
High
0 < I
IH
< 20
µ
A
2.5 V < V
IH
< V
CC
+ 0.3 V
Low
0 < I
OH
< -48 mA
-0.1 V < V
IL
< 0.4 V
Cable Requirements
A 68 conductor cable no more than 3 meters (9.84 feet) cumulative length with at
least 30 AWG wire size and a characteristic impedance of 70 to 100 ohms (84
ohms nominal) is required. In systems which use the fast synchronous transfer
option, the cable should meet the following additional requirements:
Table 5-18
Interface Cable Electrical Characteristics
Specification
Value
Signal Attenuation
0.095dB maximum per meter at 5 Mhz
Pair-to-Pair Propagation Delay Delta
0.20 ns maximum per meter
DC Resistance
0.230 ohms maximum per meter at 20
°
C
