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Very High 77.7MHz (155.5Mbps) Switching Rates

Ultra-Low CMOS Power Dissipation

Easy Pin-Compatible Upgrades From CMOS or Bipolar RS-422 Solutions

Oct 14, 1996

October 14, 1996 -- The first Mil-Spec quad line driver-receiver devices incorporating the very high-speed, power-saving Low Voltage Differential Signal (LVDS) standard are available now from National Semiconductor Corporation®.

These CMOS devices feature high bandwidth - up to 77.7MHz or 155.5Mbps speed - and ultra low power dissipation to provide pin-compatible upgrade paths from lower-performing LS, FAST, or CMOS RS-422 parts.

Targeted applications include target tracking, communications, graphics, video and other data-highway designs requiring high-speed transfer rates faster than 10Mbps with extremely low power consumption, as well as other high-speed point-to-point data transmission such as box-to-box communication which must meet very low EMI standards. Operating over the military temperature range of -55 to +125 degrees C, the devices are fully compatible with the TIA LVDS and the IEEE 1596.3 SCI (Scaleable Coherent Interface) LVDS standards.

The DS90C031E-QML Quad Driver features a guaranteed maximum differential skew of 3ns and a maximum propagation delay of 5ns. Differential signaling levels are only +/-350 mV - 50% smaller than PECL levels - that enable faster switching and lower EMI emissions.

The DS90C032E-QML quad receiver features a maximum propagation delay of 8ns. It also accepts small 350mV differential signal swings.

Other pertinent specifications include supply currents of 25mA maximum for the driver and 11mA +/-100mV and maximum operating cable length of up to 10 meters.

About LVDS
LVDS technology addresses all issues for most high data-rate applications, such as raw speed, ultra low power consumption, reliable data transmission and low noise emissions. This is because the technology measures only the voltage differential or swings between drivers and receivers instead of a precise voltage level for a one or a zero.

Because the receivers respond only to differential voltages, they reject any noise introduced into the medium as common mode modulation, thus achieving outstanding common mode noise immunity. To reach the very high data rates, LVDS employs much-lower signal levels and signal swings compared to older technologies.

Price & Availability
Available now in ceramic leadless chip carrier (LCC) packages, the devices are fully pin-compatible with RS422 DS26XX31/32 parts in "LS," "F", and "C" versions. Prices are $32.90 resale in 100-piece quantities for each part. The two devices fully meet Mil-PRF 38535 QML-Q under National's DESC (Defense Electronics Supply Center)-validated QML system to operate over the full military temperature range, and further underscore the company's commitment to provide systems-oriented solutions for mil/aero customers.

DESC Standard Microcircuit Drawing (SMD) numbers are 5962-9583301Q2A for the driver and 5962-9583401Q2A for the receiver.

For more information on the DS90C031E-QML Quad Driver (Literature #1003662-001) and the DS90C032E-QML Quad Receiver (Literature # 1003665-001) or other National mil-aero products, visit our world wide web site is http://www.national.com.

National Semiconductor Corporation® provides Technologies for Moving and Shaping Information®. The company focuses on four strategic markets: communications, personal systems, industrial and consumer. Headquartered in Santa Clara, Calif., National has 19,000 employees worldwide and reported sales of $2.6 billion in fiscal 1996.