DS21T06 데이터 시트보기 (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS21T06

SCSI Terminator

Dallas Semiconductor -> Maxim Integrated 

www.dalsemi.com

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

DS21T06

SCSI Terminator

PIN ASSIGNMENT

PD 1

R1 2

R2 3

R3 4

R4 5

R5 6

HS-GND 7

HS-GND 8

NC 9

R6 10

R7 11

R8 12

R9 13

TPWR 14

28 GND

27 R18

26 R17

25 R16

24 R15

23 R14

22 NC

21 HS-GND

20 NC

19 R13

18 R12

17 R11

16 R10

15 VREF

DS21T06S 28-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. 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.

Active termination provides 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. One DS21T06 can be used to terminate the Narrow SCSI bus, or a

DS21T07 can be used with a DS21T06 for termination of a Wide SCSI bus.

REFERENCE DOCUMENTS

SCSI-2 (X3.131-1994)

SCSI-3 Parallel Interface (X3T10/855D)

SCSI-3 Fast–20 (X3T10/1071D)

Available from: Global Engineering Documents

15 Inverness Way East

Englewood, CO 80112-5704

Phone: (800) 854-7179,(303) 792-2181

Fax: (303) 792-2192

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