Lexington, Mass.—STMicroelectronics' 20-strong series of three-pin reset ICs, the STM18xx series, are designed as lower current drop-in replacements for the industry standard DS18xx (Dallas/Maxim) series for voltage monitoring in high volume, cost sensitive MCU-based applications. To cut overhead and speed delivery, the chip's final attributes are programmed by laser just prior to assembly, with some options being determined during the assembly process.
An extension of the company's STM809-812 reset IC series, the new family consists of eight basic circuits. Four devices are for 5-volt applications, each with 4.62- and 4.37-volt (nominal) threshold options. The remaining four are 3-volt devices, each with three threshold options: 3.06, 2.88, and 2.55 volts (nominal). The chips generate a reset signal when monitored voltage falls below tolerance and at start-up (power on reset).
Designers have a choice of active-high or active-low outputs (push-pull configuration), or active-low output (open drain and a built-in pull-up resistor). The STM1813 and STM1818 each include a reset monitor function, which allows them to be used with processors that have bidirectional reset pins such as the ST7 family. The same feature can also be used to implement push-button reset with no need for debounce circuitry.
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The STM18xx series, in lead-free, SOT23-3L packages on reels of 2500 pieces and rated for use over the industrial temperature range (–40 to +85°C), are priced starting at 23 cents each in high volume.
STMicroelectronics, 1-888-787-3550, www.st.com