DS2119M 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS2119M

Ultra3 LVD/SE SCSI Terminator

Dallas Semiconductor -> Maxim Integrated 

DS2119M

Table 1. PIN DESCRIPTION

PIN

1

2–5, 7–12,

18–21, 23–26

6, 22

13

14

15

16

17

27, 28

SYMBOL

VREF

RxP,

RxN

HS GND

ISO

GND

MSTR/SLV

DIFFSENSE

DIFF_CAP

TPWR

DESCRIPTION

Reference Voltage. 2.85V reference in SE mode and 1.25V reference in

LVD mode; must be decoupled with a 4.7µF cap.

Signal Termination. Connect to SCSI bus signal lines.

Heat Sink Ground. Internally connected to the mounting pad. Should

be grounded.

Isolation. When pulled high, the DS2119M isolates its bus pins (RxP,

RxN) from the SCSI bus.

Ground. Signal ground; 0V.

Master/Slave. Mode-select for the noncontrolling terminator. When

pulled high, MSTR enables the DIFFSENSE driver.

DIFFSENSE. Output to drive the SCSI bus DIFFSENS line.

DIFFSENSE CAPACITOR. Connect a 0.1µF capacitor for

DIFFSENSE filter. Input to detect the type of device (differential or

single-ended) on the SCSI bus.

Termination Power. Connect to the SCSI TERMPWR line and

decouple with a 2.2µF capacitor.

RECOMMENDED OPERATING CONDITIONS

PARAMETER

Termpower Voltage

SE Mode

LVD Mode

Logic 0

Logic 1

Operating Temperature

SYMBOL MIN TYP

VTPWR(SE)

4.0

VTPWR(LVD) 2.7

VIL

-0.3

VIH

2.0

VAMB

0

MAX

5.5

5.5

+0.8

VTPWR + 0.3

70

UNITS

V

V

V

V

°C

NOTES

6 of 9

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