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MAX6312UK48D4-T Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX6312UK48D4-T Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 16 page open-drain, N-channel output. The MAX6308/MAX6309/ MAX6310 feature an active-low, complementary output structure that both sinks and sources current, and the MAX6311/MAX6312/MAX6313 have an active-high com- plementary reset output. The MAX6305/MAX6308/MAX6311 switch from under- voltage lockout operation to normal operation between 1.5V < VCC < 2.5V. Below 1.5V, VCC undervoltage- lockout mode asserts RESET. Above 2.5V, VCC normal- operation mode asserts reset if RST IN_ falls below the RST IN_ threshold. Manual-Reset Input (MAX6306/MAX6309/MAX6312) Many µP-based products require manual-reset capability, allowing an operator or external logic circuitry to initiate a reset. A logic low on MR asserts reset. Reset remains asserted while MR is low, and for a reset active timeout period (tRP) after MR returns high. This input has an inter- nal 63.5k Ω pull-up resistor, so it can be left open if it is not used. MR can be driven with TTL-logic levels in 5V sys- tems, with CMOS-logic levels in 3V systems, or with open- drain/collector output devices. Connect a normally open momentary switch from MR to GND to create a manual- reset function; external debounce circuitry is not required. If MR is driven from long cables or if the device is used in a noisy environment, connecting a 0.1µF capacitor from MR to ground provides additional noise immunity. The MR pin has internal ESD-protection circuitry that may be forward biased under certain conditions, drawing excessive current. For example, assume the circuitry driv- ing MR uses a +5V supply other than VCC. If VCC drops or browns out lower than +4.7V, MR’s absolute maximum rat- ing is violated (-0.3V to (VCC + 0.3V)), and undesirable current flows through the ESD structure from MR to VCC. To avoid this, it is recommended that the supply for the MR pin be the same as the supply monitored by VCC. In this way, the voltage at MR will not exceed VCC. Adjustable Reset Inputs The MAX6305–MAX6313 each have one or more reset inputs (RST IN_ /OVRST IN). These inputs are com- pared to the internal reference voltage (Figure 1). Connect a resistor voltage divider to RST IN_ such that VRST IN_ falls below VRSTH (1.23V) when the monitored voltage (VIN) falls below the desired reset threshold (VTH) (Figure 2). Calculate the desired reset voltage with the following formula: R1 + R2 VTH = ________ x VRSTH R2 5-Pin, Multiple-Input, Programmable Reset ICs 6 _______________________________________________________________________________________ RST IN1 * †† † ††† +1.23V +1.23V +1.23V +1.23V RST IN2 RESET GENERATOR RESET*** OVRST IN GND VCC VCC MR RESET** MAX6306/MAX6307/MAX6309/MAX6310/MAX6312/MAX6313 ONLY MAX6305–MAX6310 ONLY MAX6311/MAX6312/MAX6313 ONLY MAX6307/MAX6310/MAX6313 ONLY MAX6305/MAX6308/MAX6311 ONLY MAX6306/MAX6309/MAX6312 ONLY * ** *** † †† ††† MAX6305–MAX6313 Figure 1. Functional Diagram |
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