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TL2218-285

Texas Instruments
Part Number TL2218-285
Manufacturer Texas Instruments
Description Current-Mode SCSI Terminator
Published Feb 8, 2020
Detailed Description ą TL2218Ć285, TL2218Ć285Y EXCALIBUR CURRENTĆMODE SCSI TERMINATOR ą SLVS072C − DECEMBER 1992 − REVISED OCTOBER 1995 avai...
Datasheet PDF File TL2218-285 PDF File

TL2218-285
TL2218-285

Overview
ą TL2218Ć285, TL2218Ć285Y EXCALIBUR CURRENTĆMODE SCSI TERMINATOR ą SLVS072C − DECEMBER 1992 − REVISED OCTOBER 1995 available features • Fully Integrated 9-Channel SCSI Termination • No External Components Required • Maximum Allowed Current Applied at First High-Level Step • 6-pF Typical Power-Down Output Capacitance • Wide Vterm† (Termination Voltage) Operating Range, 3.
5 V to 5.
5 V • TTL-Compatible Disable Feature • Compatible With Active Negation • Thermal Regulation PW PACKAGE (TOP VIEW) TERMPWR NC NC D0 D1 D2 D3 D4 NC GND 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 NC − No internal connection TERMPWR DISABLE NC D8 D7 NC D6 D5 NC GND description The TL2218-285 is a current-mode 9-channel monolithic terminator specially designed for single-ended small-computer-systems-interface (SCSI) bus termination.
A user-controlled disable function is provided to reduce standby power.
No impedance-matching resistors or other external components are required for its operation as a complete terminator.
The device operates over a wide termination-voltage (Vterm†) range of 3.
5 V to 5.
5 V, offering an extra 0.
5 V of operating range when compared to the minimum termination voltage of 4 V required by other integrated active terminators.
The TL2218-285 functions as a current-sourcing terminator and supplies a constant output current of 23 mA into each asserted line.
When a line is deasserted, the device senses the rising voltage level and begins to function as a voltage source, supplying a fixed output voltage of 2.
85 V.
The TL2218-285 features compatibility with active negation drivers and has a typical sink current capability of 20 mA.
The TL2218-285 is able to ensure that maximum current is applied at the first high-level step.
This performance means that the device should provide a first high-level step exceeding 2 V even at a 10-MHz rate.
Therefore, noise margins are improved considerably above those provided by resistive terminators.
A key difference between the ...


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