The range of hysteresis values that can be set with threshold detectors has been greatly widened with the development of the MIC833 chip. Melding together a precision, 1% voltage reference with two ultra-low-power comparators and a latch, the MIC833 threshold detector IC for portable, battery-powered products enables hysteresis values to be set anywhere from millivolts to volts, a dramatic improvement over the 100-to-200 mV span for competing comparators with adjustable hysteresis. The independently-adjustable upper and lower detection thresholds are set by three external resistors, with the hysteresis voltage represented by the difference between the two thresholds. Other chip characteristics include: a propagation delay of 5 µs for a low supply current of just 1 µA; inputs and outputs that can pull up to 6V, regardless of supply voltage; built-in hysteresis for noise suppression; and immunity to brief input transients. The micropower precision dual voltage comparator comes in an IttyBitty 5-lead SOT23-5 package.
Company: MICREL SEMICONDUCTOR INC.
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