Ultra2 LVD/SE SCSI Terminator

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Part Number	Status	Replacement	Explanation
DS2117M	This product is No Longer Available. See Ordering Information for recommended replacements.	DS2118M	The DS2118M is pin compatible and the DS2118M 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 allowing the end-user SE-backward compatibility with legacy devices. If the device is connected in an LVD-only bus, the DS2118M will use LVD termination. If any SE devices are connected to the bus, the DS2118M will use SE termination. This is accomplished automatically inside the part by sensing the voltage on the SCSI bus DIFFSENS line.

Description

The DS2117M LVD/SE SCSI Terminator combines a low-voltage differential (LVD) and single-ended (SE) termination. The multimode operation enables the designer to combine LVD capability for current products with SE backwards-compatibility for legacy SCSI devices.

On an LVD-only bus, the DS2117M will use LVD termination. If any SE devices are connected to the bus, then it will use SE termination. If an HVD (high voltage differential) device is connected to the bus, then it will isolate the termination from the bus. All of this is accomplished automatically inside the part by sensing the voltage on the SCSI bus DIFFSENS line. An integrated digital filter eliminates the need for external passive components on the DIFFSENS line.

The DS2117M was designed for a low input capacitance of 3pF that is necessary to support Ultra SCSI transfer rates. Three DS2117M terminators can be used to terminate a wide SCSI bus. Applications include high-end PCs, workstations, SCSI host bus adapters, terminated cable assemblies, terminated connectors, RAID systems, and SCSI peripherals.

All Dallas terminators feature power-down mode with extremely low quiescent consumption. Different SCSI terminators are available to match every existing SCSI protocol and to address different design concerns, such as price, board space and voltage differential.

Data Sheet

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Key Features

Complies with SCSI-1, 2, and 3, Fast SCSI, Ultra, Ultra2, Ultra160, and Ultra320
Actively terminates 9 signal line pairs
Provides multimode low voltage differential/single-ended (LVD/SE) termination
Auto-selection of LVD or SE termination
5% tolerance on both LVD and SE termination resistance
Hardware or software switchable power-down mode
Low power-down capacitance of 3pf
On-chip thermal shutdown circuitry
SCSI bus hot-plug compatible
Operating ranges:
- 2.7V to 5.5V
- 0°C to +70°C

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Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS2117MB/T&R		N/A	No Longer Available	DS2118M	SSOP; Land Pattern: Not Available	0°C to +70°C	See data sheet
DS2117MB/T&R/		N/A	No Longer Available	DS2118M	SSOP; Land Pattern: Not Available	0°C to +70°C	See data sheet

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
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Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Rev 2; 2005-12-01
This page last modified: 2007-07-25