DS2106S/T&R

Overview

The DS2106S/T&R is a SCSI bus terminator integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It features an 18-line termination network with a nominal impedance of 110 ohms, designed for high-speed data transmission integrity. The device utilizes bipolar technology and is housed in a 28-pin Small Outline Integrated Circuit (SOIC) package, specifically identified as PDSO28 with a 0.300-inch body width. It operates from a single 5V power supply and supports a maximum slew rate of 500 mA. The component is classified under signal terminators within the interface category.

Feature Summary

• Provides precise 110-ohm differential termination for SCSI bus lines to minimize signal reflections.
• Integrates 18 termination lines into a compact surface-mount package for space-constrained designs.
• Utilizes bipolar process technology to ensure stable performance at standard 5V logic levels.

Applications

• Termination of SCSI parallel interfaces in computer peripheral systems.
• Signal integrity management in high-speed digital data buses requiring 110-ohm characteristic impedance.
• End-of-bus termination in legacy SCSI disk drive and controller architectures.

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels due to discontinued status. Confirm RoHS compliance requirements against specific project standards, as original versions may not meet current environmental regulations. Request full datasheets and application notes to validate electrical characteristics before integration into new designs.

Selection Notes

Select this component only for legacy SCSI systems requiring exact 110-ohm bipolar termination. Evaluate alternative modern terminators if designing new hardware, as this part is obsolete. Ensure PCB layout accommodates the 28-SOIC footprint and that power supply noise remains within acceptable limits for the specified 500 mA slew rate capability.

Part Context

The DS2106S belongs to the broader family of SCSI interface components produced by Maxim Integrated, now part of Analog Devices. It serves as a specialized passive-active hybrid terminator, distinct from active power management or sensing devices in the same portfolio. Its primary role was maintaining signal fidelity in parallel SCSI environments during the era of high-performance storage solutions.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. As the DS2106S is marked as obsolete, engineers must design around existing inventory or consult manufacturer support for qualified replacement recommendations tailored to specific SCSI implementation requirements.