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DS21S07ASTR

更新时间： 2024-10-28 04:15:11

品牌	Logo	应用领域
美信 - MAXIM		/
页数	文件大小	规格书
10页	89K
描述
SCSI Terminator

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中文翻译

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数据手册

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DS21S07ASTR 数据手册

DS2109

Plug and Play SCSI Terminator

FEATURES

PIN ASSIGNMENT

• Fully compliant with SCSI–1, Fast SCSI and Ultra

PDI

GND

R18

SCSI

• Compatible with Plug and Play SCSI Profile

• Functionally compatible with DS21S07A

• Provides active termination for 18 signal lines

R17

R16

R15

R14

HS–GND

PDO

TCS

HS–GND

PDE

R13

• 2% tolerance on termination resistors and voltage

regulator

• Bus termination sensing

R12

• Low power down capacitance of 3 pF

• Onboard thermal shutdown circuitry

R11

R10

TPWR

REF

DS2109, DS2109S 28–PIN SOIC (300 MIL)

DESCRIPTION

The DS2109 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 exter-

naldeviceisconnectedtothesystem. TheDS2109sat-

isfies 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

DS2109 will automatically be isolated from the SCSI

bus thereby maintaining proper system termination.

The DS2109 integrates a low drop–out regulator, 18

precise switched 110 ohm termination resistors, and

bus termination sensors into a 28–pin 300 mil SOIC

package. Active termination provides: greater immu-

nity to voltage drops on the TERMPWR (TERMination

PoWeR) line, enhanced high–level noise immunity,

intrinsic TERMPWR decoupling, and very low quies-

cent current consumption. The DS2109 contains an

output port that can control the power down pin of addi-

tional terminators (DS21S07A) for Wide SCSI applica-

tions.

022698 1/10

12 3 4 5 6 7...10

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