Fast GTLP Backplanes With the GTLPH1655 (Rev. A)

This revision of the Fast GTL Backplanes With the GTL1655 application report addresses improvements, such as the improved OECE circuitry and implementation of the Texas Instruments TI-OPCE circuitry, that have been incorporated in the GTLPH1655 device. These improvements significantly improve signal integrity in distributed loads. This application report describes the physical principles of fast bus systems and the problems that can arise in their development. These descriptions are based on line theory, and various specifications of TTL, backplane transceiver logic (BTL), Gunning transceiver logic (GTL), and Gunning transceiver logic plus (GTLP) integrated circuits are compared. In addition, this application report presents the performance of the SN74GTLPH1655. This new UBTE device provides an optimum solution for the design of backplanes for future high-speed bus systems. Comprehensive measurement results of the SN74GTLPH1655 also are included in this application report. OEC, TI-OPC, and UBT are trademarks of Texas Instruments.