DS21T09S Dallas Semiconducotr, DS21T09S Datasheet - Page 5

• Manufacturer Part Number: DS21T09S
• Description: Plug and Play SCSI Terminator
• Manufacturer: Dallas Semiconducotr

BUS GROUND SENSING
If internal and external SCSI devices are connected to the SCSI bus, the DS21T09 will disconnect from
the SCSI bus according to the circuit in Figure 3. To utilize this automatic disconnect method of bus
sensing, configure the DS21T09 as shown in Figure 4. The
connected to pin 22 of the internal SCSI connector, and the
pin 36 of the external SCSI connector.
BUS GROUND SENSING CIRCUIT Figure 3
BUS GROUND DETECT CONFIGURATION Figure 4
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PDI
PDE
(Power Down Internal) pin should be
(Power Down External) connected to