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SN75LBC968 Datasheet(PDF) 2 Page - Texas Instruments |
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SN75LBC968 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 19 page SN75LBC968 9CHANNEL BUS TRANSCEIVER WITH ACTIVE TERMINATION SLLS179E − APRIL 1994 − REVISED AUGUST 2005 2 WWW.TI.COM description (continued) The communication between the SN75LBC968 and the controller can be accomplished at 3.3-V logic levels provided that the VCC1 input connects to the same supply rail as the controller. This provides a bridge from the lower-voltage circuit and the 5-V SCSI bus. The SN75LBC968 also removes the need for special I/O buffers (and associated power dissipation) on the controller itself. The SN75LBC968 must be used with a SCSI controller with support for Differential SCSI. The integrated, current-mode, active termination supplies a constant 24 mA of current (TERMPWR) to the bus when the bus voltage falls below 2.5 V. This makes the next low-to-high (negation) signal transition independent of the low-level (asserted) bus voltage, unlike voltage-mode terminators. The termination current is provided through the TE input and from TERMPWR and can be disabled by letting the TE input float or by connecting it to ground. The termination circuitry is independent from the line drivers and receivers and VCC or VCC1. Operational termination is present as long as TERMPWR is applied. The switching speeds of the SN75LBC968 are sufficient to transfer data over the data bus at ten million transfers per second (Fast-SCSI). The specification, tsk(lim), is for system skew budgeting and maintenance of bus set-up and hold times. The device is available in the space-efficient shrink-small-outline package (SSOP) with 25-mil lead pitch. The SN75LBC968 meets or exceeds the requirements of ANSI X3.131−1994 (SCSI-2) and the proposed SPI (SCSI-3) standards, and is characterized for operation from 0 °C to 70°C. logic diagram (positive logic) 31 1B 56 37 35 33 2B 3B 4B 11 10 9 8 7 6 4 2 54 5 Channel 4 Channel 3 Channel 2 4DE/RE 4A 3DE/RE 3A 2DE/RE 2A 1A TE 50 48 46 5B 6B 7B 24 23 22 21 20 19 Channel 7 Channel 6 Channel 5 7DE/RE 7A 6DE/RE 6A 5DE/RE 5A 29 8B 9B 28 27 26 25 Channel 9 Channel 8 9DE/RE 9A 8DE/RE 8A CE 1DE/RE Active Terminator |
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