Low-voltage monitors ease power sequencing - Embedded.com

Low-voltage monitors ease power sequencing

Maxim Integrated Products has developed the MAX16025/MAX16026/MAX16041 (dual), the MAX16027/MAX16028/MAX16042 (triple), and the MAX16029/MAX16030/MAX16043 (quad) voltage monitors with capacitor-adjustable timing delays to meet today's complex power-sequencing requirements.

The MAX16025/MAX16027/MAX16029 have open-drain and reset outputs, the MAX16026/MAX16028/MAX16030 have push-pull outputs, and the MAX16041/MAX16042/MAX16043 have open-drain outputs with a push-pull reset output. When all the monitored voltages are above their respective specified threshold, a separate reset output de-asserts to allow the microcontroller to operate. All these devices can operate from 2.2 to 28 V with outputs capable of handling up to 28 V, which lets them interface to standard bus voltages. Two logic inputs are used to select one of nine threshold options. These nine options offer fixed and user-adjustable thresholds for monitoring voltages down to 0.5 V.

The MAX16025-MAX16030 and MAX16041/MAX16042/MAX16043 also include enable inputs for controlling each monitor, a tolerance input to select for a -7.5% or -12.5% nominal threshold, a manual-reset input, and a fixed- or adjustable-reset timeout feature. All devices are specified from -40° to +125°C, and are offered in lead-free, 4- by 4-mm TQFN packages. Prices start at $1.19 each for quantities of 1000. Data sheets are available at www.maxim-ic.com/quick_view2.cfm/qv_pk/5156 (MAX16025-30) and www.maxim-ic.com/quick_view2.cfm/qv_pk/5264 (MAX16041-43).

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