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Dec 16, 1996

December 16, 1996 -- National Semiconductor Corporation® today introduced the newest member of its growing family of integrated temperature sensors -- a low-power dual thermostat with digital outputs. Capable of operating from a 2.7Vµ power supply, the LM56 requires just 230mA (max) quiescent current.

The LM56 combines an integrated temp sensor, two comparators and a voltage reference in a single IC. With the simple addition of three external resistors, the user can set up a thermostat-type function that is fully programmable over the full operating temperature range (-40°C to +125°C). An additional analog temperature output offers 6.25mV/°C with excellent voltage linearity.

"The LM56 is the only dual 2.7V thermostat available anywhere, " noted Patricia Smith, National's technical marketing engineer. "Now, designers can reduce board space, shorten design time, improve performance, and lower cost by replacing a handful of discrete components with a single, efficient 8-lead device, " she added.

The fully programmable LM56 is ideal for use wherever thermal stability is critical to the operating environment. Potential applications include reducing noise by turning system fans on only when required and turning them off as soon as possible. Another is protecting precision elements in test equipment from damaging or dangerous fault conditions.

The part includes a 5 degree hysteresis over the entire temperature range, set by internal comparators. Adding three external resistors sets the temperature trip points by dividing down the 1.250V bandgap voltage reference. National also offers an application board that facilitates quick, easy hook-up to a power supply and evaluation of its output characteristics.

Price and Availability
The LM56CIM in an 8-pin SO package is priced at $0.75 each in 1,000-unit quantities. Production quantities are currently available. For data sheets and user information visit our World Wide Web site at http://www.national.com.

National Semiconductor produces analog and mixed-signal based silicon solutions for the information highway, communications, consumer and industrial markets. National Semiconductor is headquartered in Santa Clara, California, and has 19,000 employees worldwide. In fiscal 1996, the company reported sales of $2.6 billion.