DS21T05

Features:

  Fully compliant with SCSI-1, Fast SCSI andUltra SCSI
  Functionally compatible to the DS21T07,targeted for high volume applications
  Provides active termination for nine signallines
  Laser-trimmed 110-ohm termination resistorhave 5% tolerance
  Low dropout voltage
  Power-down mode isolates terminationresistors from the bus
  SCSI bus hot-plug compatible
  Fully supports actively negated SCSI signals
  Onboard thermal shutdown circuitry
  16-pin plastic narrow SOIC


Pinout




Specifications

Voltage on Any Pin Relative to Ground............... -1.0V to +7.0V
Operating Temperature .......................................... .0 to 70
Storage Temperature................ ........................-55 to +125
Soldering Temperature ..............................260 for 10 seconds


Description

Fast SCSI and Ultra SCSI require the use of active terminations at both ends of every cable segment in aSCSI system with single-ended drivers and receivers. The DS21T05 SCSI Terminator, which is fullycompliant with these standards, enables the designer to gain the benefits of active termination: greaterimmunity to voltage drops on

the TERMPWR (TERMination PoWeR) line, enhanced high-level noiseimmunity, intrinsic TERMPWR decoupling, and very low quiescent current consumption. The DS21T05,which integrates a regulator and nineprecise-switched, 110-ohm termination resistors into a monolithicIC, is a functionally compatible versionof the DS21T07. With relaxed output current and terminationtolerances, the DS21T05 is intended for high volume applications which require active termination butnot the high performance of the DS21T07.