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Voltage supervisor monitors 27 unique thresholds

Posted: 16 Aug 2007 ?? ?Print Version ?Bookmark and Share

Keywords:voltage supervisor? unique thresholds? network servers?

Linear Technology Corp. has introduced the LTC2915, a single voltage supervisor with 27 unique pin-selectable thresholds. This voltage supervisor can be easily configured to meet different monitoring tasks, eliminating the need to qualify and stock multiple supervisors.

LTC2915 can be used in applications ranging from network servers monitoring 12V to low-voltage portable equipment. The 27 selectable thresholds are specified with an overall accuracy of 1.5 percent without the need for 0.1 percent external resistors.

The LTC2915 includes two three-state input pins that select one of nine internally programmed thresholds: 12V, 5V, 3.3V, 2.5V, 1.8V, 1.5, 1.2V, 1V or an adjustable 0.5V. A third three-state input determines if the input threshold is -5 percent, -10 percent or -15 percent below the selected voltage level, allowing for margining.

Offered in low-profile (Linear also offers the LTC2916, a variation on the LTC2915, which provides the same nine input thresholds, but with a fixed -5 percent tolerance. However, the LTC2916 includes a separate manual reset input for a simple pushbutton interface.

Both the LTC2915 and LTC2916 operate from a single 1.5-5.5V supply and consume only 30?A of quiescent current. To reduce sensitivity to short glitches from a noisy power supply, the LTC2915/LTC2916 input comparator's glitch immunity ensures reliable reset operation without false triggering. These supervisors include an active-low reset output with a delay time that can be set to 200ms, 400?s, or an adjustable period, allowing a processor time to initialize and load memory before it begins operating.

Pricing starts at $1.05 each in quantities of 1,000. Both the LTC2915 and LTC2916 are available in commercial, industrial, and automotive temperature grades.

- Gina Roos

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