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DS2125

Ultra3 LVD/SE SCSI 15-Line Terminator

Maxim Integrated 

DS2125 Ultra3 LVD/SE SCSI 15-Line Terminator

ELECTRICAL CHARACTERISTICS (continued)

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

PARAMETER

SYMBOL

CONDITIONS

VREF REGULATOR

2.85V Regulator Line

Regulation

DIFFSENS OUTPUT

DIFFSENS Driver Output

Voltage

DIFFSENS Driver Source

Current

DIFFSENS Driver Sink

Current

DIFFSENS Leakage

(Note 3)

VDSO

IDSH

IDSL

ILEAK, LOW

ILEAK, HIGH

THERMAL SHUTDOWN

Thermal-Shutdown

Threshold

Thermal-Shutdown

Hysteresis

MODE CHANGE DELAY/FILTER

Mode Change Delay

tDELAY

LOGICAL SIGNALS (ISO)

Input Low Voltage

VIL

VREF unloaded; vary TPWR from

4.0V to 5.5V

-5mA ≤ IDFFSENS ≤ 50µA

VDIFFSENS = 0V

VDIFFSENS = 3.3V

With ISO high, |VDIFFSENS| = 0.3V

With ISO high, |VDIFFSENS - VTPWR| =

0.3V

For increasing temperature

(Note 1)

(Note 1)

Input High Voltage

VIH

Input Current

DIFF_CAP

Input Current

DIFF_CAP SE

Operating Range

DIFF_CAP LVD

Operating Range

DIFF_CAP HVD

Operating Range

IIL

IL

VSEOR

VLVDOR

VHVDOR

VCC = 3.3V

VIL = -0.3V

Note 1: Guaranteed by design.

Note 2: TPWR = 4.0V.

Note 3: Room temperature only.

MIN

1.2

-15

100

-3

1

0.66

-0.3

2

-30

-1

-0.3

0.7

2.4

TYP

MAX UNITS

1.0

2.5

%

1.4

V

-5

mA

200

µA

+1

µA

3

150

°C

10

°C

1.25

2.00

ms

+0.8

V

TPWR

+ 0.3

V

-10

µA

+1

µA

+0.5

V

1.9

V

VTPWR +

0.3

V

PIN DESCRIPTION

PIN

1, 2, 11–26,

37–48

3

NAME

RxP, RxN

TPWR

FUNCTION

Signal Termination. Connect to SCSI bus signal lines.

Termination Power. Connect to the SCSI TERMPWR line and decouple with a 2.2µF

capacitor.

4–9, 28–33 HS_GND Heat-Sink Ground. Internally connected to the mounting pad. This should be grounded.

10

VREF

Reference Voltage. 2.85V reference in SE mode and 1.25V reference in LVD mode; must be

decoupled with a 4.7µF capacitor.

27

GND

Ground. Signal ground, 0V.

34

DIFF_CAP

DIFFSENSE Capacitor. Connect a 0.1µF capacitor for the DIFFSENSE filter. Input to detect

the type of device (differential or single-ended) on the SCSI bus.

35

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

36

ISO

Isolation. When pulled high, the DS2125 isolates its bus pins (RxN, RxP) from the SCSI bus.

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