DS2119ME Ver la hoja de datos (PDF) - Maxim Integrated

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DS2119ME

Ultra3 LVD/SE SCSI Terminator

Maxim Integrated 

DS2119M

PIN DESCRIPTION

PIN

NAME

1

VREF

2–5, 7–12,

RxP,

18–21, 23–26

RxN

6, 22

HS GND

13

ISO

14

GND

15

MSTR/SLV

16

DIFFSENSE

17

DIFF_CAP

27, 28

TPWR

FUNCTION

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

SYMBOL MIN

Termpower SE Mode

VTPWR(SE)

4.0

Voltage

LVD Mode

VTPWR(LVD)

2.7

Logic 0

VIL

-0.3

Logic 1

VIH

2.0

Operating Temperature

VAMB

0

TYP

MAX UNITS

5.5

V

5.5

V

+0.8

V

VTPWR +

0.3

V

70

°C

NOTES

6 of 9

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