Datasheet > DS21T09

DS21T09

更新时间： 2024-10-27 22:50:51

品牌	Logo	应用领域
达拉斯 - DALLAS		/
页数	文件大小	规格书
10页	223K
描述
Plug and Play SCSI Terminator

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数据手册

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DS21T09 数据手册

DS21T09

Plug and Play SCSI Terminator

www.dalsemi.com

FEATURES

PIN ASSIGNMENT

ꢀ Fully compliant with SCSI-1, Fast SCSI and

Ultra SCSI

PDI

GND

R18

R17

R16

R15

R14

TCS

HS-GND

PDE

R13

ꢀ Compatible with Plug and Play SCSI Profile

ꢀ Functional drop in replacement for the

DS2109

ꢀ Complementary part to DS21T07 for wide

SCSI

HS-GND

PDO

ꢀ Provides active termination for 18 signal lines

ꢀ 2% tolerance on termination resistors and

voltage regulator

R12

R11

R10

V_REF

ꢀ Bus termination sensing

ꢀ Low power-down capacitance of 3 pF

ꢀ Onboard thermal shutdown circuitry

TPWR

DS21T09S 28-Pin SOIC (300-mil)

DESCRIPTION

The DS21T09 is intended for one-chip Plug and Play (PnP) SCSI termination. Plug and Play SCSI

requires the exit-point terminator on computer motherboards or host bus adapters to automatically switch

off if an external device is connected to the system. The DS21T09 satisfies this requirement by offering

the engineer a choice of onboard current sensing circuitry or onboard ground detect circuitry. If an

external device is connected, the DS21T09 will automatically be isolated from the SCSI bus thereby

maintaining proper system termination.

The DS21T09 integrates a low drop-out regulator, 18 precisely switched 110Ω=termination resistors, and

bus termination sensors 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. The DS21T09

contains an output port that can control the power-down pin of additional terminators (DS21T07) for

Wide SCSI applications.

REFERENCE DOCUMENTS

SCSI-2 (X3.131-1994)

SCSI-3 Parallel Interface (X3T10/855D)

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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与DS21T09相关器件

型号	品牌	获取价格	描述	数据表
DS21T09S	DALLAS	获取价格	Plug and Play SCSI Terminator
DS21T09S	MAXIM	获取价格	SCSI Terminator, 18-Line, 110ohm, MOS, PDSO28, 0.300 INCH, SOIC-28
DS21T09S+	MAXIM	获取价格	SCSI Terminator, 18-Line, 110ohm, PDSO28, 0.300 INCH, SOIC-28
DS21T11	ETC	获取价格	Terminator
DS21T11S/T&R	MAXIM	获取价格	SCSI Terminator, 18-Line, 110ohm, PDSO28, 0.300 INCH, SOIC-28
DS21T16E	DALLAS	获取价格	SCSI Terminator, 9-Line, PDSO20,
DS21T16E	MAXIM	获取价格	SCSI Terminator, 9-Line, PDSO20, 0.173 INCH, PLASTIC, TSSOP-20
DS21T26	DALLAS	获取价格	Bus Terminator, MOS, PDSO36,
DS21T26	MAXIM	获取价格	Bus Terminator, MOS, PDSO36,
DS21T26B	DALLAS	获取价格	SCSI Terminator, 27-Line, 110ohm, PDSO36,