DS2118M

Series: -
Operating Temperature: 0°C ~ 70°C
Mounting Type: Surface Mount
Packaging: Tube
Number of Terminations: 9
Type: SCSI, LVD, SE
Package / Case: 36-BSOP (0.295", 7.50mm Width)
Supplier Device Package: 36-SSOP
Manufacturer: Maxim Integrated Products
Voltage - Supply: 4 V ~ 5.5 V


Features:

  Fully compliant with Ultra2 SCSI
  Provides Multimode Low VoltageDifferential/Single-Ended (LVD/SE)termination for 9 signal line pairs
  Auto-selection of LVD or SE termination
  5% tolerance on SE and LVD terminationresistance
  Low power down capacitance of 3 pF
  Onboard thermal shutdown circuitry
  SCSI bus hot plug compatible
  Fully supports actively negated SE SCSIsignals


Pinout




Description

The DS2118M Ultra2 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 currentproducts while allowing the end-user SE backward compatibility with legacy devices. If the device isconnected in an LVD-only bus, the DS2118M will use LVD termination. If any SE devices are connectedto the bus, the DS2118M will use SE termination. This is accomplished automatically inside the part bysensing the voltage on the SCSI bus DIFFSENS line.For the LVD termination, the DS2118M integrates two regulated supplies with nine precisionresistorstrings.

For the SE termination, one regulator and nine precision 110-ohm resistors areused. ThreeDS2118M terminators are needed for a Wide SCSI bus.