Datasheet > DS21T05Z

DS21T05Z

更新时间： 2024-10-27 23:48:51

品牌	Logo	应用领域
其他 - ETC		/
页数	文件大小	规格书
7页	127K
描述
Terminator

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中文翻译

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数据手册

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DS21T05Z 数据手册

DS21T05

SCSI Terminator

www.dalsemi.com

FEATURES

PIN ASSIGNMENT

ꢀ Fully compliant with SCSI-1, Fast SCSI and

Ultra SCSI

TERMPWR1

VREF2

ꢀ Functionally compatible to the DS21T07,

targeted for high volume applications

ꢀ Provides active termination for nine signal

lines

ꢀ Laser-trimmed 110-ohm termination resistors

have 5% tolerance

ꢀ Low dropout voltage

ꢀ Power-down mode isolates termination

resistors from the bus

ꢀ SCSI bus hot-plug compatible

ꢀ Fully supports actively negated SCSI signals

ꢀ Onboard thermal shutdown circuitry

ꢀ 16-pin plastic narrow SOIC

VREF1

GND

TERMPWR2

DS21T05Z 16-Pin SOIC (150-mil)

TERMPWR1

VREF2

VREF1

GND

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

resistors when the signal line is low (active). When the driver for a given signal line turns off, the

terminator will pull the signal line to 2.85V (quiescent state). To handle actively negated SCSI signals,

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112099

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中文翻译

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与DS21T05Z相关器件

型号	品牌	获取价格	描述	数据表
DS21T05Z+	MAXIM	获取价格	SCSI Terminator, 9-Line, 110ohm, PDSO16, 0.150 INCH, PLASTIC, SOIC-16
DS21T05Z+T&R	MAXIM	获取价格	SCSI Terminator, 9-Line, 110ohm, PDSO16, 0.150 INCH, PLASTIC, SOIC-16
DS21T06	DALLAS	获取价格	SCSI Terminator
DS21T06S	DALLAS	获取价格	SCSI Terminator
DS21T07	DALLAS	获取价格	SCSI Terminator
DS21T07E	MAXIM	获取价格	SCSI Terminator, 9-Line, 110ohm, PDSO20, 0.173 INCH, PLASTIC, TSSOP-20
DS21T07E	ROCHESTER	获取价格	9-LINE 110 ohm SCSI BUS TERMINATOR, PDSO20, 0.173 INCH, PLASTIC, TSSOP-20
DS21T07E/T&R	MAXIM	获取价格	SCSI Terminator, 9-Line, 110ohm, PDSO20, 0.173 INCH, PLASTIC, TSSOP-20
DS21T07E+	MAXIM	获取价格	SCSI Terminator, 9-Line, 110ohm, PDSO20, 0.173 INCH, PLASTIC, TSSOP-20
DS21T07E+T&R	MAXIM	获取价格	SCSI Terminator, 9-Line, 110ohm, PDSO20, 0.173 INCH, PLASTIC, TSSOP-20

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