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DS21T06

Description
SCSI Terminator
File Size112KB,6 Pages
ManufacturerDALLAS
Websitehttp://www.dalsemi.com
Download Datasheet Compare View All

DS21T06 Overview

SCSI Terminator

DS21T06
SCSI Terminator
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
PIN ASSIGNMENT
PD
R1
R2
R3
R4
R5
HS-GND
HS-GND
NC
R6
R7
R8
R9
TPWR
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
GND
R18
R17
R16
R15
R14
NC
HS-GND
NC
R13
R12
R11
R10
V
REF
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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