SN75LBC978 Datasheet | Texas Instruments

description The SN75LBC978 is a nine-channel differential transceiver based on the 75LBC176 Lin ASIC cell. Use of TI’s Lin Bi CMOS† process technology allows the power reduction necessary to integrate nine differential balanced transceivers†. On-chip enabling logic makes this device applicable for the data path (eight data bits plus parity) and the control path (nine bits) for the Small puter Systems Interface (SCSI) standard. The WRAP function allows in-circuit testing and wired-OR channels for the BSY, RST, and SEL signals of the SCSI bus. The SN75LBC978 is packaged in a shrink small-outline package (DL) with improved thermal characteristics using heat-sink terminals. This package is ideal for low-profile, space-restricted applications such as hard disk drives. DL PACKAGE (TOP VIEW) NC WRAP2 WRAP1 1A 1DE/RE 2A 2DE/RE 3A 3DE/RE 4A 4DE/RE VCC GND GND GND GND GND VCC 5A 5DE/RE 6A 6DE/RE 7A 7DE/RE 8A 8DE/RE 9A 9DE/RE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 56 NC 55 NC 54 CE 53 9B + 52 9B - 51 8B + 50 8B - 49 7B + 48 7B - 47 6B + 46 6B - 45 VCC 44 GND 43 GND 42 GND 41 GND 40 GND 39 VCC 38 5B + 37 5B - 36 4B + 35 4B - 34 3B + 33 3B - 32 2B + 31 2B - 30 1B + 29 1B - Pins 13 through 17 and 40 through 44 are connected together to the package lead frame and signal ground. The switching speed of the SN75LBC978 is sufficient to transfer data over the data bus at 10 million transfers per second. Each of the nine identical channels conforms to the requirements of the ANSI RS-485 and ISO 8482:1987(E) standards referenced by ANSI X3.131-1993 (SCSI-2) and the proposed SCSI-3 standards. The SN75LBC978 is characterized for operation from 0°C to 70°C. † Patent Pending Lin ASIC and Lin Bi CMOS are trademarks of Texas Instruments Incorporated. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include...