Dallas Semiconductor DS2109 Datasheet

The DS2109 is a single-chip Plug and Play (PnP) SCSI terminator.

Brand: Dallas Semiconductor
Category: Other Electronics
Document type: Datasheet
Language: English
Pages: 10
File format: PDF
File size: 86 KB
Published: 07 May, 2012
Updated: 01 October, 2023
Model: DS2109
MD5 checksum: B18692E090377EFEA3E0D0C9CE9AB6AC
PDF: Dallas Semiconductor DS2109 Datasheet PDF

About this manual

The DS2109 is a single‑chip Plug‑and‑Play SCSI terminator that provides active termination for 18 signal lines. It includes a low‑dropout regulator, 110 Ω termination resistors, and bus‑termination sensing circuitry to automatically isolate the device when an external device is attached.

The document details functional blocks, pin assignments, electrical characteristics, absolute maximum ratings, recommended operating conditions, and package dimensions, enabling designers to integrate the DS2109 into host bus adapters or motherboards.

What's inside

Features
Description
Pin Assignment
Detailed Pin Description
Active Termination
Bus Ground Sensing
Bus Current Sensing
Absolute Maximum Ratings
Recommended Operating Conditions
DC Characteristics

Specifications

Termination Resistance	110 Ω (typical)
VREF Output Voltage	2.85 V (typical)
Power Down Current	2 mA (typical)
Bus Current Sense Trip Point	32 mA

Frequently asked questions

How does the DS2109 detect bus termination status?

It uses either bus‑ground sensing or bus‑current sensing circuitry to automatically connect or disconnect the termination resistors.

What is the recommended operating temperature range?

The DS2109 is specified to operate from 0 °C to 70 °C.

What is the typical output voltage of the internal regulator?

The regulator provides a typical output of 2.85 V.

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