DS2117MB

Overview

The DS2117MB is a SCSI bus terminator integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It supports Single-Ended (SE), Low-Voltage Differential (LVD), and Ultra3 SCSI standards, providing termination for nine signal lines. The device operates within a supply voltage range of 4V to 5.5V and functions at temperatures between 0°C and 70°C. It is housed in a 36-pin SSOP package with dimensions of 0.295 inches (7.50mm) width. The component is classified as obsolete and has been subject to product change notices.

Feature Summary

• Provides simultaneous termination for SE, LVD, and Ultra3 SCSI interfaces
• Integrates nine distinct termination channels for comprehensive bus control
• Operates on standard CMOS logic levels

Applications

• SCSI bus termination in legacy computer systems
• Peripheral interface cards requiring multi-standard SCSI support
• Industrial equipment utilizing SCSI data transmission protocols

Procurement Notes

This component is officially listed as obsolete by the manufacturer. Verification of current availability requires checking authorized distributors or secondary market suppliers. Buyers must confirm the specific revision level and packaging format against original design specifications before procurement. Compliance with RoHS3 standards is documented, but lead-free status should be verified against the latest datasheet revisions.

Selection Notes

Designers replacing this part must ensure compatibility with existing SCSI architecture requirements. The fixed 36-SSOP package necessitates careful PCB footprint verification. Since the device handles multiple SCSI standards, substitute components must offer equivalent termination capabilities for SE, LVD, and Ultra3 modes to maintain signal integrity across different bus speeds.

Part Context

The DS2117MB belongs to the DS2117M family of SCSI terminators. It was produced by Dallas Semiconductor, which later became part of Maxim Integrated and subsequently Analog Devices Inc. The part serves as a specialized interface solution for managing electrical loads on SCSI buses, distinguishing it from general-purpose logic ICs through its dedicated termination resistors and control circuitry.

Replacement Considerations

Public records indicate potential substitutes include variants such as DS2117MB/T&R. Users should verify functional equivalence regarding pinout and termination resistance values when considering these alternatives.