MAX809HTRG(2010) View Datasheet(PDF) - ON Semiconductor

Part Name

Description

Manufacturer

MAX809HTRG
(Rev.:2010)

Very Low Supply Current 3-Pin Microprocessor Reset Monitors

ON Semiconductor 

MAX809 Series, MAX810 Series

Detail Operation Description

The MAX809/810 series microprocessor reset

supervisory circuits are designed to monitor the power

supplies in digital systems and provide a reset signal to the

processor without any external components. Figure 2 shows

the timing diagram and a typical application below. Initially

consider that input voltage VCC is at a nominal level greater

than the voltage detector upper threshold (VTH). And the

RESET (RESET) output voltage (Pin 2) will be in the high

state for MAX809, or in the low state for MAX 810 devices.

If there is an input power interruption and VCC becomes

significantly deficient, it will fall below the lower detector

threshold (VTH−). This event causes the RESET output to be

in the low state for the MAX809, or in the high state for the

NCP810 devices. After completion of the power

interruption, VCC will rise to its nominal level and become

greater than the VTH. This sequence activates the internal

oscillator circuitry and digital counter to count. After the

count of the timeout period, the reset output will revert back

to the original state.

Input Voltage

VVVCTTHHC+–

Reset Output

MAX809, NCP803

VCC

VTH–

0V

Reset Output

MAX810

VCC

VTH–

0V

tRP

Figure 15. Timing Waveforms

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