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DS2118MB

Ultra3 LVD/SE SCSI Terminator

Maxim Integrated 

DS2118M

PIN DESCRIPTION

PIN

NAME

1

VREF

2, 3

4–7, 11–16,

22–25, 29–32

8, 10, 26, 9,

28, 27

NC

RxP,

RxN

HS GND

17

ISO

18

GND

19

MSTR/SLV

20

DIFFSENSE

21

DIFF_CAP

33

SE

34

LVD

35

HVD

36

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.

No Connection. Do not connect these pins.

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 DS2118M isolates its bus pins (RxP,

FxP) from the SCSI bus.

Ground. Signal ground; 0V.

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

pulled high (MSTR), the DIFFSENSE driver is enabled.

DIFFSENSE. Output to drive the SCSI bus DIFFSENS line.

DIFFSENSE Capacitor. Connect 0.1µF capacitor for DIFFSENSE

filter. Input to detect the type of device (differential or single-ended) on

the SCSI bus.

Single-Ended. SE output of DIFFSENSE receiver; indicates SE bus

operation.

Low-Voltage Differential. LVD output of DIFFSENSE receiver;

indicates LVD bus operation.

High-Voltage Differential. HVD output of DIFFSENSE receiver;

indicates HVD bus operation or thermal shutdown.

Termination Power. Connect to the SCSI TERMPWR line and

decouple with 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

5.5

5.5

+0.8

VTPWR +

0.3

70

UNITS

V

V

V

V

°C

NOTES

7 of 10

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