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Fabricante

DS2120

Ultra3 LVD SCSI Terminator

Maxim Integrated 

DS2120

PIN DESCRIPTION

PIN

TSSOP

SSOP

1

1

2–5, 7–12,

18–21,

23–26

4–7, 11–16,

22–25,

29–32

6, 22 8–10, 26–28

13

17

14

18

15

19

16

20

17

21

27, 28

—

—

36

34

2, 3, 33, 35

NAME

VREF

RxP, RxN

HS_GND

ISO

GND

MSTR/SLV

DIFFSENSE

DIFF_CAP

TPWR

LVD

NC

FUNCTION

Regulator Output Voltage. 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 connected to ground.

Isolation. When pulled high, terminating resistors and

biasing current sources are isolated from the SCSI bus.

Signal Ground

Master/Slave. Mode select for the noncontrolling

terminator. When pulled high (MSTR), the DIFFSENS

driver is enabled.

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 2.2µF capacitor.

Low-Voltage Differential. Output of DIFFSENSE

receiver; output high indicates LVD bus operation.

No Connection. Do not connect pins.

RECOMMENDED OPERATING CONDITIONS

PARAMETER

SYMBOL MIN

Termpower 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

+0.8

VTPWR +

0.3

70

UNITS

V

V

V

°C

NOTES

13

13

6 of 10

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