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First in a series, low-power device translates a BLVDS backplane signal into six CMOS outputs for adjacent chips

Nov 22, 1999

November 22, 1999 - National Semiconductor Corporation (NYSE:NSM) today announced a six-channel clock driver with 50psec skew to distribute clock signals within data and telecommunications systems. First in a planned series of clock-driver devices, the DS92CK16 translates one BLVDS (bus low-voltage differential signaling) input signal into six TTL-compatible output signals for adjacent chips on the same board. The 100MHz DS92CK16 also is capable of driving the BLVDS backplane with the clock signal.

"Distributing accurate synchronous clocks is a key issue in large data and telecommunication systems," said Mark Sauerwald, Technical Marketing Manager for National. "BLVDS is the ideal technology for clock distribution with its combination of high speed, low power, low EMI and high noise immunity. The DS92CK16 takes full advantage of the benefits inherent in LVDS technology to simplify clock distribution design challenges."

Clock distribution networks are often not ideal environments, with many stubs attached to the transmission line on the backplane. To help performance in this non-ideal environment, National design engineers implemented a Gradual Turn On (GTO) BLVDS driver which is less sensitive than a very fast signal to a non-ideal environment. Despite these features, power is typically 30mW and the channel-to-channel skew is only 50 picoseconds, ECL performance at a fraction of the power. "Very low power dissipation, and very low EMI further reduce system costs through minimizing power supplies, cooling and shielding requirements. These costs often far outstrip the costs of integrated circuits in large systems," Sauerwald said.

LVDS, with its inherent low power and low EMI emissions, is a National specialty. The company has a portfolio of over 75 LVDS interface devices and is developing more LVDS interface and driver chips to meet customer requirements. Bus LVDS (BLVDS) is a National variation of LVDS, optimized for high-speed bus or backplane data transfers in large, high-performance system applications. The DS92CK16 is produced on a 0.35-micron CMOS process that enhances the low power and high performance attributes of National's LVDS technology.

Pricing and Availability
Available now, theDS92CK16 is priced at $5.00 each in 1000-unit quantities. The device is housed in a space-saving 24-lead TSSOP package. For more information on the DS92CK16, visit National's World Wide Web site at www.national.com or contact National's Customer Response Group at 1-800-272-9959.

About National Semiconductor
National Semiconductor provides system-on-a-chip solutions for the information age. Combining real-world analog and state-of the-art digital technology, the company's chips lead many sectors of the personal computer, communications, and consumer markets. With headquarters in Santa Clara, California, National reported sales of $2 billion for its last fiscal year and currently has about 11,000 employees worldwide. Additional company and product information is available on the World Wide Web at www.national.com