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DS21T09, DS21T0S, DS21T11

Table of contents:
Info of DS21T09
Info of DS21T0S
Info of DS21T11

DS21T09, DS21T0S, DS21T11 Selling Leads, Datasheet

MFG:DALLAS Package Cooled:SOP D/C:00+

DS21T09, DS21T0S, DS21T11 Datasheet download

Five Points

Part Number: DS21T09

MFG: DALLAS

Package Cooled: SOP

D/C: 00+

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DS21T09 Parameters

DS21T09 Features

Fully compliant with SCSI-1, Fast SCSI, and Ultra SCSI

Compatible with PnP SCSI Profile

Functional drop-in replacement for the DS2109

Complementary part to DS21T07 for Wide SCSI

Provides active termination for 18 signal lines

2% tolerance on termination resistors and voltage regulator

Bus termination sensing

Low power-down capacitance of 3pF

On-board thermal shutdown circuitry

DS21T09 General Description

Plug and Play SCSI Terminator

DS21T09 Maximum Ratings

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

DS21T09 Features

Fully compliant with SCSI-1, Fast SCSI, and Ultra SCSI

Compatible with PnP SCSI Profile

Functional drop-in replacement for the DS2109

Complementary part to DS21T07 for Wide SCSI

Provides active termination for 18 signal lines

2% tolerance on termination resistors and voltage regulator

Bus termination sensing

Low power-down capacitance of 3pF

On-board thermal shutdown circuitry

DS21T09 Typical Application

DS21T09 Datasheet

DS21T09 Connection Diagram

DS21T11 General Description

Fast SCSI and Ultra SCSI require the use of active terminations at both ends of every cable segment in SCSI system with singleended drivers and receivers. Ultra SCSI requires support of active negation and hot plugging. The DS21T11 is fully compliant with these standards.

The DS21T11 integrates a low dropout regulator and 18 precise switched 110 ohms termination resistors into a 28pin 300 mil SOIC package.

Active termination provides: greater immunity to voltage drops on the TERMPWR (TERMination PoWeR) line, enhanced highlevel noise immunity, intrinsic
TERMPWR decoupling, and very low quiescent current
consumption. One DS21T11 can be used to terminate
the Narrow SCSI bus, and a DS21T07 can be used with
a DS21T11 for termination of a Wide SCSI bus.

DS21T11 Maximum Ratings

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

DS21T11 Features

• Fully compliant with SCSI1, Fast SCSI and Ultra 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

DS21T11 Connection Diagram

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