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Special Focus on Logic Breaking the high-speed barrier LVC logic now specified to 1.8 V New bus switch keeps data moving LV CMOS redesigns provide faster speeds, lower power and lower noise New UBT optimized for high-performance backplane uses |
New UBT optimized for high-performance backplane usesTelecommunications and network designers have a new solution for their high-performance backplane applications. TI’s 3.3-V GTL1655 Universal Bus Transceiver (UBT™) is well suited for high-speed backplane uses with a focus on high data rate and live-insertion support. The 16-bit, LVTTL-to-GTL+ UBT offers backplane designers an effective way to migrate to the next generation of performance. The UBT’s high drive of 100 mA is complemented by a maximum frequency of 160 MHz and a maximum propagation delay of 4.9 ns, (VERC=0). The GTL1655 is the first product to combine these characteristics in a single discrete transceiver. The GTL1655 provides live-insertion capability for backplane applications by tolerating active signals on the data ports when the device is powered off. In addition, a biasing pin (BIAS VCC) preconditions the GTL/GTL+ port to minimize disruption to an active backplane. An edge rate control pin (VERC) allows optimization of the B port’s output rise and fall times to meet various backplane loading conditions. Output edge-rate control (OEC™) is especially important for the reduction of electromagnetic interference, which traditionally has been associated with the high frequencies supported by GTL devices. TI provides OEC on all of its GTL devices. The A port features active bus-hold circuitry that allows for the holding of unused or floating data inputs at a valid logic level, eliminating the need for external pullup/pulldown resistors. The GTL1655 is available in a thin shrink small-outline package (TSSOP) for improved performance as well as significant savings in board space. n For complete information, order: GTL1655 Data Sheet (SCBS696). See Releated Product Information. UBT and OEC are trademarks of Texas Instruments. Comparison of GTL and FB+ technologies
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