DS2125+T&R Maxim Integrated Products, DS2125+T&R Datasheet

DS2125+T&R

Manufacturer Part Number

DS2125+T&R

Description

IC TERM SCSI ULT3 LVD/SE 48-LQFP

Manufacturer

Maxim Integrated Products

Type

SCSI, LVD, SEr

Datasheet

1.DS2125TR.pdf (7 pages)

Specifications of DS2125+T&R

Number Of Terminations

Voltage - Supply

2.7 V ~ 5.5 V

Operating Temperature

0°C ~ 70°C

Mounting Type

Surface Mount

Package / Case

48-LQFP

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Current page: 1 of 7
Download datasheet (183Kb)

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.

www.maxim-ic.com

GENERAL DESCRIPTION

The DS2125 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

compatibility with legacy devices. If the device is

connected in an LVD-only bus, the DS2125 uses

LVD termination. If any SE devices are connected to

the bus, the DS2125 uses SE termination, which is

accomplished automatically inside the part by

sensing the voltage on the SCSI bus DIFFSENS line.

For the LVD termination, the DS2125 integrates two

current sources with 15 precision resistor strings. For

the SE termination, one regulator and 15 precision

110Ω resistors are used. Two DS2125 terminators

are needed for a wide SCSI bus.

APPLICATIONS

Raid Systems

SCSI Host Bus Adapter (HBA) Cards

Servers

SCSI Cables

Network Attached Storage (NAS)

Storage Area Networks (SANs)

ORDERING INFORMATION

range, 0

**The top mark includes a “+” for lead-free packages.

+Denotes lead-free/RoHS-compliant package.

All devices rated over the commercial operating temperature

DS2125

DS2125+

DS2125/T&R

DS2125+T&R

PART*

C to +70

allowing

48 LQFP

48 LQFP/Tape and Reel

the

PIN-PACKAGE

end

user

TOP MARK**

DS2125

backward

Ultra3 LVD/SE SCSI 15-Line Terminator

1 of 7

FEATURES

PIN CONFIGURATION

TOP VIEW

HS_GND

Fully Compliant with Ultra3 SCSI

Provides Multimode Low-Voltage

Differential/Single-Ended (LVD/SE)

Termination for 15 Signal Line Pairs

Auto-Selection of LVD or SE Termination

5% Tolerance on SE and LVD Termination

Resistance

Low 3pF Power-Down Capacitance

On-Board Thermal-Shutdown Circuitry

SCSI Bus Hot-Plug Compatible

Fully Supports Actively Negated SE SCSI

Signals

GND

R1N

R2N

R3N

R4N

R5N

R6N

R7N

R8N

R1P

R2P

R3P

R4P

R5P

R6P

R7P

R8P

REF

Semiconductor

LQFP (1.4mm)

DS2125

Dallas

DS2125

REV: 012306

DIFF_CAP

HS_GND

TPWR

R15N

R15P

R14N

R14P

R13N

R13P

R12N

R12P

R11N

R11P

R10N

R10P

R9N

R9P

ISO

DIFFSENSE

HS_GND

Related parts for DS2125+T&R

DS2125+T&R Summary of contents

Page 1

GENERAL DESCRIPTION The DS2125 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 compatibility with legacy devices. ...

Page 2

ABSOLUTE MAXIMUM RATINGS V , ISO, GND, DIFFSENSE, DIFF_CAP, TPWR, RxP, RxN ( 15)………………………………-0.3V, +6.0V REF V Continuous Output Current………………………………………………………………………………………±200mA REF Continuous Power Dissipation (T Operating Temperature Range………………………………………………………………………………….0°C to +70°C Junction Temperature…………………………………………………………………………………………………...+150°C Storage Temperature Range………………………………………………………………………………...-65°C ...

Page 3

ELECTRICAL CHARACTERISTICS (continued) (TPWR = 3.3V 0°C to +70°C, unless otherwise noted.) A PARAMETER SYMBOL V REGULATOR REF 2.85V Regulator Line Regulation DIFFSENS OUTPUT DIFFSENS Driver Output V DSO Voltage DIFFSENS Driver Source I DSH Current DIFFSENS Driver ...

Page 4

Figure 1. Block Diagram DIFF_CAP V REF BANDGAP 1.25V DIFFSENSE THERMAL- SHUTDOWN CIRCUITRY SE DIFFENSE LVD CIRCUITRY HVD V REF + - 10Ω 10Ω Dallas Semiconductor DS2125 + - ISO CONTROL LOGIC R1N R15N R1P ...

Page 5

Figure 2. SCSI Bus Configuration TERMPWR TPWR ISO DIFFSENS V DIFF_CAP REF 4.7µF 0.1µF TPWR ISO DIFFSENS V DIFF_CAP REF 4.7µF Note: The following terms are used throughout this data sheet: DIFFSENS: Refers to the SCSI bus signal. DIFFSENSE: Refers ...

Page 6

The DS2125’s DIFF_CAP pin monitors the DIFFSENS line to determine the device’s proper operating mode. The DIFFSENSE pin can also drive the SCSI DIFFSENS line to determine the SCSI bus-operating mode. The DS2125 switches to the termination mode that is ...

Page 7

... No circuit patent licenses are implied. Maxim/Dallas Semiconductor reserves the right to change the circuitry and specifications without notice at any time The Maxim logo is a registered trademark of Maxim Integrated Products, Inc. The Dallas logo is a registered trademark of Dallas Semiconductor. DS2125 Ultra3 LVD/SE SCSI 15-Line Terminator © ...

Related keywords

ds2125
DS2125+T&R datasheet
DS2125+T&R data sheet
DS2125+T&R pdf datasheet
DS2125+T&R component
DS2125+T&R part
DS2125+T&R distributor
DS2125+T&R RoHS
DS2125+T&R datasheet download