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LVDS buffer/repeaters extend signal integrity of FPGAs, ASICs

Posted: 15 Aug 2005 ?? ?Print Version ?Bookmark and Share

Keywords:national semiconductor? buffer? repeater? low-voltage differential signaling system? lvds system?

National Semiconductor Corp.'s two new low-power, high-performance buffer/repeaters for low-voltage differential signaling (LVDS) systems extend the signal reach of fpgas and asic across backplanes and cables in telecom, datacom, industrial, medical, automotive and office imaging applications.

The DS90LV004 and SCAN90004 1.5Gbps, four-channel buffers include configurable output pre-emphasis, hot-plug protection and 15kV of electro-static discharge (ESD) protection. For designers who want to implement system-level test, the SCAN90004 features IEEE 1149.6 (JTAG) testability.

"The DS90LV004 and SCAN90004 dramatically improve the performance of a wide variety of designs driving high-speed signals," said Jeff Waters, product line director for National Semiconductor's interface division. "In FPGA- and ASIC-based designs, for example, these buffers minimize simultaneous switching noise issues, improve ESD protection, and deliver higher-speed and longer-reach signals over lower-cost cables and backplanes."

The four-channel DS90LV004 drives up to four LVDS clock and/or data channels over common backplanes or simple cable configurations. The wide differential input range interfaces to LVDS, low voltage positive-emitter-coupled logic (LVPECL) or current mode logic (CML). Output levels are fully LVDS compliant. The DS90LV004 operates at data rates up to 1.5Gbps and includes configurable output pre-emphasis that allows the designer to "overdrive" the outputs to compensate for a lossey interconnect. In power-sensitive applications, a power-down mode minimizes power consumption when all four channels of a single device are not activein redundancy applications, for example.

The SCAN90004 has the same features as the DS90LV004, and also includes IEEE standard 1149.1 and 1149.6 (JTAG) testability to verify high-speed differential connections in the system. These JTAG-accessible features extend the capability of an existing system or board-level JTAG bus to high-speed mixed-signal environments. The DS90LV004 and SCAN90004 are available now in a 48-pin TQFP.

In 1,000-unit quantities, the DS90LV004 is priced at $4.95 and the SCAN90004 with JTAG is priced at $5.20. An evaluation board and lead-free package options are also available.

- Winn Hardin


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