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DS2125
(Rev.:2004)

Ultra3 LVD/SE SCSI 15-Line Terminator

Maxim Integrated 

DS2125 Ultra3 LVD/SE SCSI 15-Line Terminator

ABSOLUTE MAXIMUM RATINGS

VREF, ISO, GND, DIFFSENSE, DIFF_CAP, TPWR, RxP, RxN (x = 1 . . . 15)

VREF Continuous Output Current

Continuous Power Dissipation (TA = +70°C), 48-Pin LQFP

Operating Temperature Range

Junction Temperature

Storage Temperature Range

Lead Temperature (soldering, 10s)

-0.3V, +6.0V

±200mA

2W

0°C to +70°C

+150°C

-65°C to +160°C

+300°C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only,

and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is

not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(TPWR = 3.3V, TA = 0°C to +70°C, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

TPWR Operating Supply

Range

VTPWR

LVD

SE

TPWR SUPPLY CURRENT

TPWR Supply Current

(All Lines Open)

ITPWR_LVD

ITPWR_SE

ITPWR_ISO

LVD SCSI mode

SE SCSI mode

ISO mode (terminators disabled)

LVD TERMINATION (Applies to each line pair, 1 to 15 in LVD mode)

Differential-Mode

Termination Resistance

RDM

Common-Mode

Termination Resistance

RCM

RP and RN shorted together

Differential-Mode Bias

VDM

All lines open

Common-Mode Bias

VCM

RP and RN shorted together

SE TERMINATION (Applies to SE terminators, 1 to 15 in SE mode)

Single-Ended Mode

Termination Resistance

RSE = (VLx - 0.2) / ILx,

where VLx = voltage at terminator

RSE

pin with pin unloaded and

ILx = current for each terminator pin

with the pin forced to 0.2V (Note 2)

Termination Current

(Note 2)

ISE

Signal level at 0.2V, all lines low

Signal level at 0.5V

SE Voltage Reference

VREF

(Note 2)

Pin Leakage

With ISO high

Single-Ended GND

Resistance

RGND

TERMINATOR PIN CAPACITANCE

Terminator Pin

Capacitance

CIN

VREF REGULATOR

1.25V Regulator Output

Voltage

VREF_LVD

1.25V Regulator Short-

Circuit Source Current

ISOURCE

1.25V Regulator Short-

Circuit Sink Current

ISINK

1.25V Regulator Line

Regulation

2.85V Regulator

2.85V Regulator Short-

Circuit Source Current

2.85V Regulator Short-

Circuit Sink Current

Measured at RP pins, I = 10mA

With ISO high (Note 1)

VREF = 0V

VREF = 3.3V

VREF unloaded; vary TPWR from

2.7V to 5.5V

(Note 2)

VREF = 0V (Note 2)

VREF = 3.3V (Note 2)

MIN

2.7

4.0

100

110

100

1.15

104.5

-21.0

-18.0

2.7

1.15

-375

170

2.7

-375

170

TYP

MAX UNITS

5.5

5.5

V

20

32

mA

1.6

10

mA

250

750

mA

110

W

165

W

125

mV

1.25

1.35

V

110

115.5

W

-24

-25.4

-22.4

mA

2.85

3.0

V

400

nA

20

60

W

3

pF

1.25

1.35

V

-700

-1000

mA

300

700

mA

1.0

2.5

%

2.85

3.0

V

-700

-1000

mA

300

700

mA

2 of 7

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