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SN75LVDM977DL Datasheet(PDF) 2 Page - Texas Instruments

Part # SN75LVDM977DL
Description  9-CHANNEL DUAL-MODE TRANSCEIVERS
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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SN75LVDM977DL Datasheet(HTML) 2 Page - Texas Instruments

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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
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