DS2125

$2.80

Description：IC TERM SCSI ULT3 LVD/SE 48-LQFP
Series：-

SKU:e841dad6ca00 Category: Signal Terminators Brand: Analog Devices Inc./Maxim Integrated

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Product introduction

Product Detailed Parameters

Description：IC TERM SCSI ULT3 LVD/SE 48-LQFP
Series：-
Mfr：Analog Devices Inc./Maxim Integrated
Package：Tube,Tube
Type：SCSI, LVD, SE
Number of Terminations：15
Voltage - Supply：2.7V ~ 5.5V
Operating Temperature：0°C ~ 70°C
Mounting Type：Surface Mount
Package / Case：48-LQFP
Supplier Device Package：48-LQFP (7x7)

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DS2125

Overview

The DS2125 is an Ultra3 LVD/SE SCSI terminator designed for multimode operation, supporting both low-voltage differential and single-ended termination. It automatically selects the appropriate mode by sensing the SCSI bus DIFFSENS line voltage. The device integrates two current sources with precision resistor strings for LVD termination and a regulator with 15 precision 110Ω resistors for SE termination. Operating supply ranges are 2.7V to 5.5V for TPWR in LVD mode and 4.0V to 5.5V for SE mode. It provides termination for 15 signal line pairs with 5% resistance tolerance and features a low 3pF power-down capacitance.

Feature Summary

Fully compliant with Ultra3 SCSI standards
Provides multimode LVD/SE termination for 15 signal line pairs
Auto-selection of LVD or SE termination based on bus conditions
On-board thermal-shutdown circuitry

Applications

Raid Systems
SCSI Host Bus Adapter (HBA) Cards
Servers
Network Attached Storage (NAS)
Storage Area Networks (SANs)

Procurement Notes

Verify the specific package variant required, as the DS2125 is available in 48-pin LQFP and Tape & Reel formats. Confirm lead-free status if RoHS compliance is mandatory for the assembly process. Check for any documented errata associated with specific manufacturing revisions before finalizing the design implementation.

Selection Notes

Select this component when designing systems requiring automatic switching between LVD and SE SCSI modes without external logic. Ensure the PCB layout allows placement close to the SCSI connector to minimize trace length and reflections. Verify that the system power supply can maintain the minimum voltage requirements for the intended operating mode.

Part Context

This device belongs to the Maxim Integrated SCSI interface family, specifically engineered for high-speed data transfer environments. It serves as a critical component for maintaining signal integrity on wide SCSI buses by providing precise impedance matching for both legacy single-ended and modern low-voltage differential signaling protocols.