ds2125 Maxim Integrated Products, Inc., ds2125 Datasheet

ds2125

Manufacturer Part Number

ds2125

Description

Ds2125 Ultra3 Lvd/se 15-line Scsi Terminator

Manufacturer

Maxim Integrated Products, Inc.

Datasheet

1.DS2125.pdf (7 pages)

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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

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