Adaptec 2740A User Manual - Page 85
Extended Industry-Standard Architecture, Interface, SCSI Interface
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AHA-2740 Series User's Manual Extended Industry-Standard Architecture Interface Table A-1. Standard EISA Bus Electronic and Physical Interface Driver Output Signals VOL 0 volts minimum IOL 24 mA VOH 2.4 volts minimum IOH 8 mA Receiver Input Signals VIL 0.8 volts maximum VIH 2.0 volts minimum 0.4 volts maximum 5.25 volts maximum SCSI Interface Electrical Interface These are the specifications listed in ANSI X3.131-1986 for single-ended operation. Output Signals All signals use open collector or three-state drivers. Each signal driven by a SCSI device has the following output characteristics when measured at the SCSI device's connector: Table A-2. Output Signals Signal VOL VOH Definition Characteristics Low-level output voltage 0.0 to 0.5 volts DC at 48 mA sinking (signal assertion) High-level output voltage 2.5 to 5.25 volts DC (signal negation) A-4 Adaptec AHA-2740 Series User's Manual Stock Number: 510381-00 / Rev. C (Page A-4) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93