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DS21T05

Dallas Semiconducotr
Part Number DS21T05
Manufacturer Dallas Semiconducotr
Description SCSI Terminator
Published Mar 30, 2005
Detailed Description DS21T05 SCSI Terminator www.dalsemi.com FEATURES PIN ASSIGNMENT Fully compliant with SCSI-1, Fast SCSI and Ultra SCSI...
Datasheet PDF File DS21T05 PDF File

DS21T05
DS21T05

Overview
DS21T05 SCSI Terminator www.
dalsemi.
com FEATURES PIN ASSIGNMENT Fully compliant with SCSI-1, Fast SCSI and Ultra SCSI 16 1 PD TERMPWR1 Functionally compatible to the DS21T07, 15 2 R1 VREF2 targeted for high volume applications 14 3 R2 R9 R8 4 13 Provides active termination for nine signal R3 12 5 R4 R7 lines 11 6 R5 R6 Laser-trimmed 110-ohm termination resistors 10 7 VREF1 NC have 5% tolerance 9 8 GND TERMPWR2 Low dropout voltage DS21T05Z 16-Pin SOIC (150-mil) Power-down mode isolates termination resistors from the bus PD TERMPWR1 1 16 SCSI bus hot-plug compatible R1 VREF2 2 15 Fully supports actively negated SCSI signals R2 NC 3 14 Onboard thermal shutdown circuitry R9 R3 4 16-pin plastic narrow SOIC 13 R4 R5 VREF1 GND 5 6 7 8 12 11 10 9 R8 R7 R6 TERMPWR2 DS21T05S 16-Pin SOIC (300-mil) 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.
The DS21T05 SCSI Terminator, which is fully compliant with these standards, enables the designer to gain the benefits of active termination: greater immunity to voltage drops on the TERMPWR (TERMination PoWeR) line, enhanced high-level noise immunity, intrinsic TERMPWR decoupling, and very low quiescent current consumption.
The DS21T05, which integrates a regulator and nine precise-switched, 110-ohm termination resistors into a monolithic IC, is a functionally compatible version of the DS21T07.
With relaxed output current and termination tolerances, the DS21T05 is intended for high volume applications which require active termination but not the high performance of the DS21T07.
FUNCTIONAL DESCRIPTION The DS21T05 consists of a bandgap reference, buffer amplifier, and nine termination resistors (Figure 1).
The bandgap reference circuit produces a precise 2.
55V level which is fed to a buffer amplifier.
The buffer produces a 2.
85V level and is capable of sourcing at least 24 mA into each of the termination resistor...


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