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Timers ease mobile lock up reset

Posted: 21 May 2012 ?? ?Print Version ?Bookmark and Share

Keywords:reset timer? pulse widths? supply current?

Fairchild Semiconductor has expanded its line of reset timers with three devices that are designed for resolving system freezes in mobile devices. The FT7522 and FT10001 provide fixed delays of 7.5 and 10 seconds and offer inputs for single-button resetting capability. The FT3001 provides design flexibility with two inputs for single- or dual-button resetting capability as well as four different delay values that can be selected using the DSR0 and DSR1 pins.

Reset timers provide a delay between when a button/key is pressed and when the system resets, thereby preventing an unintended reset. The new devices are designed with a variety of delay times for resetting mobile devices and product options that provide both fixed and selectable delays, single- or dual-button reset, and fixed or variable reset pulse widths.

All the devices function over a power supply range of 1.65V to 5V and draw minimal supply current when inactive, making them suitable for use in portable devices where battery conservation is essential.

The FT10001has one input reset pin; an open-drain output pin with fixed 530ms pulse; and The FT7522 also has one input reset pin, but its open-drain output pin has a fixed 400ms pulse and its ICCQ consumption is at 1?A. It is also zero-second test-mode enabled.

The FT3001 offers selectable reset delays of 3s, 3.75s, 4.5s, or 6s. Its ICC current consumption in standby mode is ?1?A. It offers primary and secondary input reset pins as well as push-pull and open-drain output pins.

The times are available in 8-Lead MLP and10-Lead UMLP packages. They are priced, in 1,000 quantity pieces, at $.22, $.28 and $.29 for the FT7522, FT10001 and FT3001, respectively.

Samples are available upon request, with delivery taking 8-12 weeks ARO.





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