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MAX6418UK16-T Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX6418UK16-T Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 12 page Detailed Description The MAX6412–MAX6420 low-power microprocessor (µP) supervisory circuits provide maximum adjustability for supply-voltage monitoring and reset functionality. In addition, the MAX6412–MAX6420 reset timeout period is adjustable using an external capacitor. The MAX6412/MAX6413/MAX6414 have factory- trimmed reset threshold voltages in approximately 100mV increments from 1.575V to 5.0V with a manual reset input. The MAX6415/MAX6416/MAX6417 contain a reset threshold that can be adjusted to any voltage above 1.26V using external resistors. The MAX6418/ MAX6419/MAX6420 offer both a factory-trimmed reset threshold and an adjustable reset threshold input for dual-voltage monitoring. A reset signal is asserted when VCC and/or RESET IN falls below the preset values or when MR is asserted. The reset remains asserted for an externally pro- grammed interval after VCC and/or RESET IN has risen above the reset threshold or MR is deasserted. Reset Output The reset output is typically connected to the reset input of a µP. A µP’s reset input starts or restarts the µP in a known state. The MAX6412–MAX6420 µP supervi- sory circuits provide the reset logic to prevent code- execution errors during power-up, power-down, and brownout conditions (see Typical Operating Circuit). For the MAX6413, MAX6416, and MAX6419, RESET changes from low to high whenever VCC or RESET IN drops below the reset threshold voltages. Once RESET IN and VCC exceed their respective reset threshold volt- age(s), RESET remains high for the reset timeout period, then goes low. On power-up, once VCC reaches 1V, RESET is guaran- teed to be a logic high. For applications requiring valid reset logic when VCC is less than 1V, see the section Ensuring a Valid RESET/RESET Output Down to VCC = 0V. The active-low RESET output of the remaining supervi- sors is the inverse of the MAX6413, MAX6416, and MAX6419 active-high RESET output and is guaranteed valid for VCC ≥ 1V. Reset Threshold The MAX6415–MAX6420 monitor the voltage on RESET IN with an external resistor voltage-divider (Figure 1). Low-Power, Single/Dual-Voltage µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay MAX6412–MAX6420 Maxim Integrated 5 Pin Description PIN MAX6412/ MAX6413/ MAX6414 MAX6415/ MAX6416/ MAX6417 MAX6418/ MAX6419/ MAX6420 NAME FUNCTION RESET RESET changes from high to low whenever VCC or RESET IN drops below the selected reset threshold voltage (VTH or VRESET IN, respectively) or manual reset is pulled low. RESET remains low for the reset timeout period after all reset conditions are deasserted and then goes high. 11 1 RESET RESET changes from low to high whenever the VCC or RESET IN drops below the selected reset threshold voltage (VTH or VRESET IN) or manual reset is pulled low. RESET remains high for the reset timeout period after all reset conditions are deasserted and then goes low. 2 2 2 GND Ground —3 3 RESET IN Reset Input. High-impedance input to the adjustable reset comparator. Connect RESET IN to the center point of an external resistor-divider network to set the threshold of the externally monitored voltage. See Reset Threshold section. 3— — MR Manual Reset Input. Pull this pin low to manually reset the device. Reset remains asserted for the reset timeout period after MR is released. 444 SRT Set Reset Timeout Input. Connect a capacitor between SRT and ground to set the timeout period. Determine the period as follows: tRP = (2.71 x 10 6) ✕ CSRT + 275µs with tRP in seconds and CSRT in Farads. 555 VCC Supply Voltage and Input for Fixed-Threshold VCC Monitor |
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