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Hot-switchable SCSI controller having output drivers with quick turn-on

  • US 5,919,253 A
  • Filed: 06/25/1997
  • Issued: 07/06/1999
  • Est. Priority Date: 06/25/1997
  • Status: Expired due to Term
First Claim
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1. An integrated circuit including an output driver coupled to a terminated SCSI bus, the output driver having a quick turn-on characteristic and configured to be hot-switchable onto and off of an active SCSI bus, the integrated circuit comprising:

  • an output driver including an N-channel pull-up transistor and an N-channel pull-down transistor, the pull-up transistor having a turn-on characteristic in operative response to a charge current magnitude provided on a gate terminal thereof;

    a resistor divider network coupled to the gate terminal, the resistor divider network including a resistor coupled in series with the charge current path and a resistor coupled in parallel to the charge current path;

    bypass means coupled in parallel with series resistor; and

    feedback means coupled between an output of said output driver and the bypass means, the feedback means in operative response to an output voltage of said output driver output, the feedback means configured in a first state when said output voltage is below a trigger value, the feedback means first state for maintaining feedback means in an on condition thereby bypassing said series resistor, the feedback means configured in a second state said output voltage is above a trigger value, said feedback means second state turning off said bypass means thereby allowing current flow through said series resistor.

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