DS2117M Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS2117M

Ultra3 LVD/SE SCSI Terminator

Dallas Semiconductor -> Maxim Integrated 

DS2117M

PIN DESCRIPTION Table 1

PIN

SYMBOL

DESCRIPTION

1

VREF Reference Voltage. 2.85 volt reference in SE mode and 1.25 volt

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

2, 3

NC

No Connect. Do not connect these pins.

4-7, 11-16,

RxP

Signal Termination. Connect to SCSI bus signal lines.

22-25, 29-32

RxN

8, 10, 26,

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

9, 28, 27

be grounded.

17

ISO

Isolation. When pulled high, the DS2117M isolates its bus pins (RxP,

RxN) from the SCSI bus.

18

GND Ground. Signal ground; 0.0 volts.

19

MSTR/SLV Master/slave. Mode select for the non-controlling terminator. When

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

20

DIFFSENSE DIFFSENSE. Output to drive the SCSI bus DIFFSENS line.

21

DIFF_CAP DIFFSENSE CAPACITOR. Connect 0.1 µF capacitor for

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

single-ended) on the SCSI bus.

33

SE

Single-ended. SE output of DIFFSENSE receiver; output high

indicates SE bus operation.

34

LVD Low Voltage Differential. LVD output of DIFFSENSE receiver;

output high indicates LVD bus operation.

35

HVD High Voltage Differential. HVD output of DIFFSENSE receiver;

output high indicates HVD bus operation or thermal shutdown.

36

TPWR Termination Power. Connect to the SCSI TERMPWR line and

decouple with 2.2 µF capacitor.

RECOMMENDED OPERATING CONDITIONS

PARAMETER

SYMBOL MIN TYP MAX UNITS NOTES

SE mode

Vtpwr(SE)

4.0

Termpower Voltage LVD mode Vtpwr(LVD) 2.7

Logic 0

Vil

-0.3

Logic 1

Vih

2.0

Operating Temperature

Vamb

0

5.5

V

5.5

V

+0.8

V

Vtpwr + 0.3

V

70

°C

6 of 9

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