Hot-switchable SCSI controller having output drivers with quick turn-on
US5919253A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 25, 1997 |
| Grant date | Jul 6, 1999 |
| Priority date | — |
| Expiry date | Jun 25, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D10/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An integrated circuit provides for an output driver having a quick turn-on characteristic as well as a maximum V.sub.OH level limited to the maximum SCSI specification limit. The output driver's V.sub.OH is controlled by a resistor divider network, connected between a pull-up signal source and a pull-up output device, and which functions to reduce the gate voltage on the output device such that its maximum V.sub.OH level is limited to the SCSI specification. The quick turn-on characteristic is implemented by coupling a transfer gate in parallel with the series resistor of the resistor divider network, and bypassing the series resistor during a first portion of the pull-up turn-on time of the output driver. A feedback circuit is connected between the output driver output and the transfer gate bypass circuit, in order to turn the transfer gate off when the output voltage reaches a particular trigger value, thus removing the bypass from the series resistor and allowing the resistor divider network to function normally and limit the output driver's pull-up to the maximum SCSI V.sub.OH limit. The transfer gate is further configured to allow an SCSI device incorporating the circuit to be…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.