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MAX6307UK26D1-T Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX6307UK26D1-T Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 16 page _______________Detailed Description The MAX6305–MAX6313 CMOS microprocessor (µP) supervisory circuits are designed to monitor more than one power supply and issue a system reset when any monitored supply falls out of regulation. The MAX6305/ MAX6308/MAX6311 have two adjustable undervoltage reset inputs (RST IN1 and RST IN2). The MAX6306/ MAX6307/MAX6309/MAX6310/MAX6312/MAX6313 mon- itor VCC through an internal, factory-trimmed voltage divider. The MAX6306/MAX6309/MAX6312 have, in addition, an adjustable undervoltage reset input and a manual-reset input. The internal voltage divider sets the reset threshold as specified in the device part number (Table 1). The MAX6307/MAX6310/ MAX6313 feature an adjustable undervoltage reset input (RST IN) and an adjustable overvoltage reset input (OVRST IN) in addition to the factory-trimmed reset threshold on the VCC moni- tor. Program the adjustable reset inputs with an external resistor divider (see Adjustable Reset Inputs section). Reset Outputs A µP’s reset input starts the µP in a known state. These µP supervisory circuits assert reset to prevent code- execution errors during power-up, power-down, or brownout conditions. RESET (MAX6305–MAX6310) and RESET (MAX6311/ MAX6312/MAX6313) are guaranteed to be asserted at a valid logic level for VCC > 1V (see Electrical Characteristics). Once all monitored voltages exceed their programmed reset thresholds, an internal timer keeps reset asserted for the reset timeout period (tRP); after this interval, reset deasserts. If a brownout condition occurs (any or all monitored volt- ages dip outside their programmed reset threshold), reset asserts (RESET goes high; RESET goes low). Any time any of the monitored voltages dip below their reset threshold, the internal timer resets to zero and reset asserts. The internal timer starts when all of the moni- tored voltages return above their reset thresholds, and reset remains asserted for a reset timeout period. The MAX6305/MAX6306/MAX6307 feature an active-low, 5-Pin, Multiple-Input, Programmable Reset ICs _______________________________________________________________________________________ 5 ______________________________________________________________Pin Description MAX6305 MAX6308 MAX6311 NAME FUNCTION Active-Low, Open-Drain Reset Output for the MAX6305/MAX6306/ MAX6307. Active-Low, Push/Pull Reset Output (sources and sinks current) for the MAX6308/MAX6309/MAX6310. 1 RESET Active-High, Push/Pull Reset Output for the MAX6311/MAX6312/MAX6313 2 GND System Ground — OVRST IN Overvoltage Reset Comparator Input. Asserts reset when the monitored voltage exceeds the programmed threshold. Set the reset threshold with an external resistor divider. Connect to GND if unused. — RST IN Undervoltage Reset Comparator Input. Asserts reset when the monitored voltage falls below the programmed threshold. Set the reset threshold with an external resistor divider. Connect to VCC if unused. 3, 4 RST IN1, RST IN2 — MR Manual-Reset Input. Pull low to force a reset. RESET/RESET remains active as long as MR is low and for the timeout period after MR goes high. Leave unconnected or connect to VCC if unused. 5 VCC System Supply. The MAX6306/MAX6307/MAX6309/MAX6310/ MAX6312/MAX6313 also monitor VCC through an internal factory- trimmed resistor divider to the reset comparator. MAX6306 MAX6309 MAX6312 1 2 — 4 — 3 5 MAX6307 MAX6310 MAX6313 PIN 1 2 4 3 — — 5 RESET |
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