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Linear monitor IC features pin-selectable thresholds

Posted: 05 Apr 2004 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? ltc2904? ltc2905? ltc2906? ltc2907?

Linear Technology Corp. has introduced the LTC2904/LTC2905 and the LTC2906/LTC2907, space-saving dual supply monitors.

The LTC2904 and LTC2905 feature nine combinations of input threshold levels, while the LTC2906 and LTC2907 provide one input that is adjustable to as low as 0.5V and another with three possible voltage selections.

All of the ICs offer selectable supply tolerance of 5-, 7.5-, and 10 percent, allowing for possible margining. The threshold and tolerance levels are chosen by three-state input pins and do not require any external components. According to the company, this simple three-state selection provides a diverse choice of voltage thresholds and tolerances, eliminating the need to qualify, source and stock different part numbers for different combinations of input supplies.

The 1.5 percent voltage threshold accuracy and glitch immunity ensure reliable reset operation without false triggering. The LTC2904 and LTC2906 have common RST and RST##CRLF# outputs with 200ms delay, while the LTC2905 and LTC2907 provide only a RST# with a delay time that is adjustable using an external capacitor.

All the devices are offered in 8-pin ThinSOT and DFN packages, with the small size making them suitable for handheld devices and portable intelligent instruments as well as any dual supply voltage system. Specified over the commercial and industrial temperature ranges, the ICs have prices starting at $1.35 in 1,000-piece quantities.

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