DS2117M 查看數據表（PDF） - Maxim Integrated

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DS2117M

Ultra3 LVD/SE SCSI Terminator

Maxim Integrated 

DS2117M

Ultra3 LVD/SE SCSI Terminator

www.maxim-ic.com

FEATURES

Fully Compliant with Ultra2, Ultra3, and

Ultra 160/M SCSI

Provides Multimode Low-Voltage

Differential/Single-Ended (LVD/SE)

Termination for Nine Signal Line Pairs

Auto-Selection of LVD or SE Termination

5% Tolerance on SE and LVD

Termination Resistance

Low Power-Down Capacitance of 3pF

On-Board Thermal Shutdown Circuitry

SCSI Bus Hot Plug Compatible

Fully Supports Actively Negated SE SCSI

Signals

PIN CONFIGURATION

TOP VIEW

VREF 1

NC 2

NC 3

R1P 4

R1N 5

R2P 6

R2N 7

HS GND 8

HS GND 9

HS GND 10

R3P 11

R3N 12

R4P 13

R4N 14

R5P 15

R5N 16

ISO 17

GND 18

36 TPWR

35 HVD

34 LVD

33 SE

32 R9N

31 R9P

30 R8N

29 R8P

28 HS GND

27 HS GND

26 HS GND

25 R7N

24 R7P

23 R6N

22 R6P

21 DIFF_CAP

20 DIFFSENSE

19 MSTR/SLV

SSOP

DESCRIPTION

The DS2117M Ultra3 LVD/SE SCSI terminator is both a low-voltage differential (LVD) and single-

ended (SE) terminator. The multimode operation enables the designer to implement LVD in current

products while allowing the end user SE-backward compatibility with legacy devices. If the device is

connected in an LVD-only bus, the DS2117M uses LVD termination. If any SE devices are connected to

the bus, the DS2117M uses SE termination. This is accomplished automatically inside the part by sensing

the voltage on the SCSI bus DIFFSENS line.

For the LVD termination, the DS2117M integrates two current sources with nine precision resistor

strings. For the SE termination, one regulator and nine precision 110Ω resistors are used. Three

DS2117M terminators are needed for a wide SCSI bus.

1 of 9

REV: 112905

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