DS21T07

Features:

  Fully compliant with SCSI1, Fast SCSI andUltra SCSI
  Backward compatible to the DS2107,DS2107A, and DS21S07
  Provides active termination for nine signallines
  Lasertrimmed 110 ohms terminationresistors have 2% tolerance
  Low dropout voltage regulator
  Powerdown mode isolates terminationresistors from the bus
  SCSI bus hotplug compatible
  Fully supports actively negated SCSI signals
  Onboard thermal shutdown circuitry
  16pin plastic SOIC (DS21T07S) and 20pinplastic TSSOP (Thin Shrink Small OutlinePackage) (DS21T07E)


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..........................................260for 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 DS21T07 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 DS21T07integrates a regulator and nine precise switched 110 ohms termination resistors into a monolithic IC. TheDS21T07 can be electrically isolated from the SCSI bus without physical removal from the SCSI device.