DS2127SLASHT&R datasheet(2/6 Pages) MAXIM

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Ultra3 LVD/SE SCSI 14-Line Terminator

_____________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

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

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.

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

LVD

2.7

3.3

5.5

TPWR Operating Supply Range

(Note 1)

VTPWR

5.0

5.5

TPWR SUPPLY CURRENT

ITPWR_LVD LVD SCSI mode

ITPWR_SE

SE SCSI mode

TPWR Supply Current (All Lines

Open)

ITPWR_ISO ISO mode (terminators disabled)

750

µA

LVD TERMINATION (Applies to each line pair, 1 to 14 in LVD mode)

Differential-Mode Termination

Resistance

RDM

100

110

Ω

Common-Mode Termination

Resistance

RCM

RP and RN shorted together

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

110

165

Ω

Differential-Mode Bias

VDM

All lines open

100

125

Common-Mode Bias

VCM

RP and RN shorted together (Note 1)

1.15

1.25

1.35

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

Single-Ended Mode Termination

Resistance

RSE

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

at terminator pin with pin unloaded and

ILX = current for each terminator pin with

the pin forced to 0.2V

104.5

110

115.5

Ω

Signal level at 0.2V, all lines low

-21

-24

-25.4

Termination Current

ISE

Signal level at 0.5V

-18

-22.4

SE Voltage Reference

VREF

2.7

2.85

3.0

Pin Leakage

With ISO high

400

Single-Ended GND Resistance

RGND

Measured at RP pins, I = 10mA

Ω

TERMINATOR PIN CAPACITANCE

Terminator Pin Capacitance

CIN

With ISO high (Note 2)

VREF REGULATOR

1.25V Regulator Output Voltage

VREF_LVD

0.5V

≤ VCM ≤ 2.0V, VCM applied to all RP

and RN lines simultaneously

1.15

1.25

1.35

1.25V Regulator Short-Circuit

Source Current

ISOURCE

VREF = 0V

-375

-700

-1000

1.25V Regulator Short-Circuit

Sink Current

ISINK

VREF = 3.3V

170

300

700

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