Lvd Capacitive Loads; Figure 1.57 Differential Scsi Bus Capacitive Loading - Fujitsu MBA3073 SERIES Technical Manual

1.12.6

LVD capacitive loads

There are three components to differential SCSI bus capacitive loading: –Signal to local ground
(C1), +Signal to local ground (C2), and –signal to +signal (C3) as shown in Figure 1.57. The
values C1, C2, and C3 represent measurements between the indicated points and do not represent
discrete capacitors. Capacitance measurements shall be made with a nominal 1MHz source with
the same nominal D.C. level on the +signal and the -signal as specified in Table 1.33. The driving
source from the instrumentation shall apply an A.C. signal level less than 100 mV rms.
Devices containing the enabled bus termination shall have maximum values 1.5 times the
maximums listed in Table 1.33. Differential bus termination circuitry that is not part of a device
shall have maximum values 0.5 times the maximums listed in Table 1.33.

Figure 1.57 Differential SCSI bus capacitive loading

76 C141-C015