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DS2127

Ultra3 LVD/SE SCSI 14-Line Terminator

Maxim Integrated 

Ultra3 LVD/SE SCSI 14-Line Terminator

ABSOLUTE MAXIMUM RATINGS

Voltage Range on All Pins Relative to Ground ......-0.3V to +6.0V

VREF Continuous Output Current....................................±200mA

Operating Temperature Range...............................0°C to +70°C

Junction Temperature ......................................................+150°C

Storage Temperature Range .............................-65°C to +160°C

Soldering Temperature .......................................See IPC/JEDEC

J-STD-020A Specification

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

absolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(TPWR = VTPWR(MIN) to VTPWR(MAX), TA = 0°C to +70°C, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP MAX UNITS

TPWR Operating Supply Range

(Note 1)

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 14 in LVD mode)

Differential-Mode Termination

Resistance

RDM

Common-Mode Termination

Resistance

RCM

RP and RN shorted together

(VCM(MAX) = 2V, VCM(MIN) = 0.5V)

Differential-Mode Bias

VDM All lines open

Common-Mode Bias

VCM RP and RN shorted together (Note 1)

SE TERMINATION (Applies to single-ended terminators, 1 to 14 in SE mode)

2.7

3.3

5.5

V

4

5.0

5.5

32

mA

10

750

µA

100

110

Ω

110

165

Ω

100

125

mV

1.15 1.25 1.35

V

Single-Ended Mode Termination

Resistance

RSE = (VLX - 0.2) / ILX, where VLX = voltage

RSE

at terminator pin with pin unloaded and

ILX = current for each terminator pin with

104.5

110 115.5

Ω

the pin forced to 0.2V

Termination Current

ISE

SE Voltage Reference

Pin Leakage

Single-Ended GND Resistance

TERMINATOR PIN CAPACITANCE

Terminator Pin Capacitance

VREF REGULATOR

VREF

RGND

CIN

1.25V Regulator Output Voltage VREF_LVD

Signal level at 0.2V, all lines low

Signal level at 0.5V

With ISO high

Measured at RP pins, I = 10mA

With ISO high (Note 2)

0.5V ≤ VCM ≤ 2.0V, VCM applied to all RP

and RN lines simultaneously

-21

-24 -25.4

mA

-18

-22.4

2.7

2.85 3.0

V

400

nA

20

60

Ω

3

pF

1.15 1.25 1.35

V

1.25V Regulator Short-Circuit

Source Current

ISOURCE VREF = 0V

-375 -700 -1000 mA

1.25V Regulator Short-Circuit

Sink Current

ISINK VREF = 3.3V

170

300

700

mA

2 _____________________________________________________________________

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