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SN75LVDM976DLR

SN75LVDM976DLR
Mfr. #:
SN75LVDM976DLR
Descrizione:
IC TXRX 9/9 HALF 56SSOP
Ciclo vitale:
Nuovo da questo produttore.
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SN75LVDM976DLR maggiori informazioni SN75LVDM976DLR Product Details
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SN75LVDM976DL, SN75LVDM976, SN75LVDM, SN75LVD, SN75LV, SN75L, SN75, SN7
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Step1: Vacuum Packaging with PL
Step1:
Vacuum Packaging with PL
Step2: Anti-Static Bag
Step2:
Anti-Static Bag
Step3: Packaging Boxes
Step3:
Packaging Boxes
***ser
LVDS/M-LVDS/ECL/CML 9-Channel LVD-SCSI Transceiver
***i-Key
IC 9-CH DIFF TRANSCEIVER 56SSOP
***as Instruments
The SN75LVDM976 and SN75LVDM977 have nine transceivers for transmitting or receiving the signals to or from a SCSI data bus. They offer electrical compatibility to both the single-ended signaling of X3.277:1996-SCSI-3 Parallel Interface (Fast-20) and the new low-voltage differential signaling method of proposed standard 1142-D SCSI Parallel Interface - 2 (SPI-2). The differential drivers are nonsymmetrical. The SCSI bus uses a dc bias on the line to allow terminated fail safe and wired-OR signaling. This bias can be as high as 125 mV and induces a difference in the high-to-low and low-to-high transition times of a symmetrical driver. In order to reduce pulse skew, an LVD SCSI driver's output characteristics become nonsymmetrical. In other words, there is more assertion current than negation current to or from the driver. This allows the actual differential signal voltage on the bus to be symmetrical about 0 V. Even though the driver output characteristics are nonsymmetrical, the design of the 'LVDM976 drivers maintains balanced signaling. Balanced means that the current that flows in each signal line is nearly equal but opposite in direction and is one of the keys to the low-noise performance of a differential bus. 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 logic input voltage thresholds of about 1.5 VCC. 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 = 0C to 70C.
Parte # Descrizione Azione Prezzo
SN75LVDM976DLR
DISTI # SN75LVDM976DLR-ND		IC TXRX 9/9 HALF 56SSOP
RoHS: Compliant
Min Qty: 1000
Container: Tape & Reel (TR)		Limited Supply - Call
    SN75LVDM976DLRG4
    DISTI # SN75LVDM976DLRG4-ND    		IC TXRX 9/9 HALF 56SSOP
    RoHS: Compliant
    Min Qty: 1000
    Container: Tape & Reel (TR)    		Limited Supply - Call
      SN75LVDM976DLR
      DISTI # N/A      		SCSI Interface IC 9 CHANNEL DUAL MODE TRANSCEIVER0
        SN75LVDM976DLRG4
        DISTI # 595-SN75LVDM976DLRG4        		SCSI Interface IC 9-Channel LVD-SCSI Transceiver
        RoHS: Compliant        		0
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