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Microprocessor supervisors designed for multivoltage systems

Posted: 29 Nov 2005     Print Version  Bookmark and Share

Keywords:Maxim Integrated Products  MAX16000  MAX16007  microprocessor supervisor  MAX16001 

The eight new low-voltage microprocessor supervisors from Maxim Integrated Products are housed in a small QFN package. The quad- (MAX16000, MAX16001 and MAX16002), hex- (MAX16003, MAX16004 and MAX16005), and octal-voltage (MAX16006 and MAX16007) devices provide all the supervisory functions necessary for monitoring the complex, multivoltage systems found in telecom, networking, storage and server equipment.

The MAX16000, MAX16001, MAX16003, MAX16004 and MAX16006 offer independent outputs for each monitored voltage. In addition, the MAX16001, MAX16002, MAX16004, MAX16005, MAX16006 and MAX16007 have an additional reset output that asserts whenever any of the monitored voltages falls below its respective threshold or when the manual reset input is asserted.

The reset output remains asserted for the reset timeout after all voltages are above their respective thresholds and the manual reset input is deasserted. The minimum reset timeout is set internally to 140ms. However, it can be adjusted with an external capacitor.

In addition, the MAX16001, MAX16002, MAX16004, MAX16006 and MAX16007 offer a watchdog timer that asserts the active-low reset output, or an independent watchdog output (MAX16005) when the watchdog timeout period (1.6s typical) is exceeded. The watchdog timer can be disabled by floating the input.

All open-drain outputs have internal 305A pullups that eliminate the need for external pullup resistors. Other supervisory features include a tolerance-select input for selecting 5 or 10 per cent input thresholds, and a margin-enable function for de-asserting the outputs during margin testing.

The new microprocessor supervisors are offered in 4-by-4mm QFN packages and are fully specified from -400C to 1250C. Prices start at Rs.122.65 ($2.68) (1,000-up, FOB USA).




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