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ST announces 24 industry standard supervisor chips

Posted: 07 Jan 2005 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? st? supervisor chip?

STMicroelectronics (ST) announced the availability of 24 industry standard supervisor chips, produced using by what the company claims as an innovative manufacturing flow that will reduce lead times to as little as four weeks, compared to the typical 12 or more weeks of processing and assembly time required by other suppliers.

According to ST, the new 5V and 3/3.3V supervisors are suitable for virtually all applications. Many of the parts, such as the STM706, have a manual reset input. The STM802, like most of the other devices, includes a battery switchover circuit which can be used to battery back other components in the system. Coupled with a coin cell battery, the switchover circuit turns a low-power SRAM into an NVRAM automatically switching to the battery when Vcc fails. Designed for NVRAM applications, the STM795 also includes a chip-enable gate (write protect) function.

Active-high and active-low reset output polarities are offered, and the STM707 and 708 have both. Most of the parts include a PFI/PFO circuit (power-fail in/power-fail out) which can be used to implement an early power-fail warning function or to monitor a second voltage supply. All the 3/3.3V parts include options for 2.63-, 2.93- and 3.08V reset thresholds while the 5V parts offer 4.4V and 4.65V threshold options. Counting all the voltage options, there are 46 different part numbers.

The new chips from ST are offered in a lead-free 8-pin SOIC package with an 8-pin TSSOP option to be made available this quarter. They operate over the industrial temperature range, and are 100 percent pin-compatible drop-ins to parts commonly available throughout the industry.

Samples of all the 24 devices are already available. At mid-range volume, pricing ranges from 25 cents for the STM706 to $1.30 for the STM795.

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