DS2114 Datasheet, PDF (3/6 Pages) Dallas Semiconductor – SCSI Terminator

TYPICAL SCSI BUS CONFIGURATION Figure 2
Termination Power Line
C1 ⁺
DS2114
TERMPWR1
TERMPWR2
VREF1
VREF2
GND
R1
R8 R9
+
C2
SCSI
CABLE
C1 ⁺
DS2114
TERMPWR1
TERMPWR2
VREF1
VREF2
GND
R1 R2
R9
DS2114
SCSI
BUS
TRANSCEIVER
SCSI
BUS
TRANSCEIVER
SCSI
BUS
TRANSCEIVER
SCSI
BUS
TRANSCEIVER
NOTES:
1. C1 = 4.7 µF tantalum
C2 = 2.2 µF tantalum or 4.7 µF aluminum
2. If the DS2114 is to be embedded into a peripheral that will act as a target on a SCSI bus, it is recommended that
TERMPWR be derived from the SCSI cable, not generated locally. In this configuration, if a power failure occurs
in the peripheral, it will not affect the bus.
3. A high frequency bypass capacitor (0.1 µF recommended) can be added in parallel to C1 for applications using
fast rise/fall time drivers.
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