DS2109S/T&R Maxim Integrated Products, DS2109S/T&R Datasheet - Page 2

• Manufacturer Part Number: DS2109S/T&R
• Description: IC TERM SCSI PLUG/PLAY 28-SOIC
• Manufacturer: Maxim Integrated Products
• Type: SCSIr

Specifications of DS2109S/T&R

• Number Of Terminations: 18
• Voltage - Supply: 4 V ~ 5.25 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

REFERENCE DOCUMENTS
SCSI–2 (X3.131–1994)
SCSI–3 Parallel Interface (X3T10/855D)
Available from: Global Engineering Documents
15 Inverness Way East
Englewood, CO 80112–5704
Phone: [phone]
Fax: [phone]
PnP SCSI Specification
PnP ISA Specification
PnP BIOS Specification
PnP Option ROM Specification
Available from: Plug and Play forum on
CompuServe (Go plugplay).
DS2109 APPLICATION ENVIRONMENT Figure 1
DS2109
022698 2/10
PERIPHERAL
EXIT–POINT TERMINATOR
DEVICES
DS2109 AUTOMATIC
SCSI
PROTOCOL CHIP
HOST SCSI
PERIPHERAL
HIGH DENSITY
CONNECTORS
SUBSYSTEM
50–POSITION
(TWO DS21S07A)
TERMINATOR
EXTERNAL
FUNCTIONAL DESCRIPTION
The DS2109 is designed to be a single chip termination
subsystem for use in PnP SCSI systems, Figure 1.
When embedded on a host bus adapter or mother-
board, the DS2109 can automatically sense the ter-
mination status of the SCSI bus and attach or isolate its
resistors as needed to maintain proper bus termination.
External and internal active termination can be provided
by the DS21S07A.
SCSI EXTERNAL
(TWO DS21S07A)
SCSI INTERNAL
TERMINATOR
CABLE
INTERNAL
CABLES