DESCRIPTION Fast SCSI and Ultra SCSI require the use of active terminations at both ends of every cable segment in a SCSI system with single-ended drivers and receivers. Ultra SCSI requires support of active negation and hot plugging. The DS21T06 is fully compliant with these standards. The DS21T06 integrates a low dropout regulator and 18 precise switched 110 ohms termination resistors into a 28-pin 300-mil SOIC package. FEATURES ■ Fully compliant with SCSI-1, Fast SCSI and Ultra SCSI ■ Functional drop in replacement for the DS2106 ■ Complimentary part to DS21T07 for wide SCSI ■ Provides active termination for 18 signal lines ■ 5% tolerance on termination resistors and voltage regulator ■ 5% tolerance on termination current ■ Low power down capacitance of 3 pF ■ Onboard thermal shutdown circuitry ■ SCSI bus hot plug compatible ■ Fully supports actively negated SCSI signals
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