Fairchild Semiconductor Announces FM809, FM810 and FM1233 Supervisory ICs

Fairchild Semiconductor International (San Jose, CA) announced the new FM809, FM810 and FM1233 supervisory ICs. Featuring a precision comparator and a reset generator, these devices are designed to monitor power supplies and other system voltages to generate a reset output when the voltage being monitored is out-of-tolerance. Fairchild's new supervisory ICs consume a typical current of 2µA and are suitable for use in battery-based applications.

TheFM809, FM810 and FM1233 represent three families having reset threshold voltages in the 2.63V to 4.63V range to accommodate system voltages of 5.0V, 3.3V, 3.0V and 2.7V. In addition, the FM1233 family features bi-directional reset support with on chip de-bounce circuit. This feature allows a push-button to be directly connected to its reset output, to manually generate a reset without adding logic or extra pins. The FM809 and FM1223 feature an active low-reset polarity while the FM810 features active high-reset polarity. The reset output of both FM809 and FM810 is of the push-pull type while the reset output of FM1233 is of the open-drain type. With all three products, when the supply voltage (VCC) is out-of-tolerance, the reset line of the IC is driven to its active state and is held there until VCC returns to an in-tolerance state and the time for the reset pulse has expired. The standard offering has reset pulse duration of 256ms, but other reset pulse choices from 32 to 128ms are available upon request. Customers are also able to order products with custom voltage threshold settings.

All three devices are available in SOT-23 packages and each have an operating temperature range of -40 to 105 degrees C. Other package options such as SOT-223 and SC-70 will be available soon. Pricing starts at $0.49 each in 1,000-piece quantities for the FM1233. Delivery is in two to four weeks ARO.