DS2109 datasheet(3/10 Pages) DALLAS

tên linh kiện	DS2109

Giải thích chi tiết về linh kiện	Plug and Play SCSI Terminator

PDF	10 Pages

Scroll/Zoom	100%

nhà sản xuất	DALLAS [Dallas Semiconductor]

Trang chủ	https://www.maximintegrated.com/en.html

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3 / 10 page

DS2109

022698 3/10

The DS2109 consists of 3 major functional blocks,

Figure 2:

• Voltagereference, terminating resistors, andisolation

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

VREF

–

TCS

R14

R18

110 OHMS

BANDGAP

REFERENCE

POWER

DOWN

BUFFER

BUS CURRENT

SENSING

CIRCUITRY

BUS GROUND

SENSING

CIRCUITRY

PDI

PDE

PDO

DISABLE

DS2109 bảng dữ liệu(PDF) 3 Page - Dallas Semiconductor