DS2109 Просмотр технического описания (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS2109

Plug and Play SCSI Terminator

Dallas Semiconductor -> Maxim Integrated 

DS2109

The DS2109 consists of 3 major functional blocks,

Figure 2:

• Voltage reference, terminating resistors, and isolation

switches

• Bus current sensing circuitry

• Bus ground sensing circuity

When the Bus Ground Sensing Circuitry or Bus Current

Sensing Circuitry determine that the SCSI bus is prop-

erly terminated without the DS2109, the power down

buffer isolates the resistors from the SCSI bus and dis-

ables the power amp, thereby placing the DS2109 in a

low power mode (the bus sensing circuitry always stays

active). The PDO (Power Down Output) pin can be con-

nected to the pin of a DS21S07A SCSI terminator for

Wide SCSI configurations, Figure 8.

DS2109 BLOCK DIAGRAM Figure 2

PDI

PDE

BUS GROUND

SENSING

CIRCUITRY

DISABLE DISABLE

BUS CURRENT

SENSING

CIRCUITRY

TCS

PDO

POWER

DOWN

BUFFER

BANDGAP

REFERENCE

+

–

110 OHMS

110 OHMS

110 OHMS

R14

R18

R1

VREF

022698 3/10

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