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SN75LVDM977DL Datasheet(PDF) 2 Page - Texas Instruments |
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SN75LVDM977DL Datasheet(HTML) 2 Page - Texas Instruments |
2 / 30 page www.ti.com DESCRIPTION (CONTINUED) SN75LVDM976 SN75LVDM977 SLLS292B – APRIL 1998 – REVISED JANUARY 2000 The signal symmetry requirements of the LVD-SCSI bus mean you can no longer obtain logical inversion of a signal by simply reversing the differential signal connections. This requires the ability to invert the logic convention through the INV/NON terminal. This input would be a low for SCSI controllers with active-high data and high for active-low data. In either case, the B+ signals of the transceiver must be connected to the SIGNAL+ line of the SCSI bus and the B- of the transceiver to the SIGNAL- line. The CDE0 input incorporates a window comparator to detect the status of the DIFFSENS line of a SCSI bus. This line is below 0.5 V, if using single-ended signals, between 1.7 V and 1.9 V if low-voltage differential, and between 2.4 V and 5.5 V if high-voltage differential. The outputs assume the characteristics of single-ended or LVD accordingly or place the outputs into high-impedance, when HVD is detected. This, and the INV/NON input, are the only differences to the trade-standard function of the SN75976A HVD transceiver. Two options are offered to minimize the signal noise margins on the interface between the communications controller and the transceiver. The SN75LVDM976 has logic input voltage thresholds of about 0.5 VCC. The SN75LVDM977 has a fixed logic input voltage threshold of about 1.5 V. The input voltage threshold should be selected to be near the middle of the output voltage swing of the corresponding driver circuit. The SN75LVDM976 and SN75LVDM977 are characterized for operation over an free-air temperature range of TA = 0°C to 70°C. 2 Submit Documentation Feedback |
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