Part # MAX6391-MAX6392 datasheet

Part Manufacturer: Maxim


Part Description: MAX6391 92 DS

Part Details:

19-2210; Rev 2; 12/05 Dual-Voltage µP Supervisory Circuits with Sequenced Reset Outputs MAX6391/MAX6392 General Description Features The MAX6391/MAX6392 microprocessor (µP) supervisory Preset VCC Reset Threshold Voltages from 1.58V circuits provide sequenced logic reset outputs for multi- to 4.63V (master supply) component or dual-voltage systems. Each device canmonitor two supply voltages and time-sequence two reset Customer-Adjustable RESET IN2 to Monitor outputs to control the order in which system components Voltages Down to 625mV (secondary supply) are turned on and off. The MAX6391/MAX6392 increase Fixed (140ms min) RESET1 Timeout system reliability and reduce circuit complexity and costcompared to separate ICs or discrete components. Fixed (140ms min) or Customer-Adjustable The MAX6391/MAX6392 monitor VCC as the master RESET2 Timeout Period reset supply. Both RESET1 and RESET2 are asserted Guaranteed Reset Valid to VCC = 1V whenever VCC drops below the selected factory-fixedreset threshold voltage. RESET1 remains asserted as Active-Low Open-Drain Outputs or Push- long as VCC is below the threshold and deasserts Pull/Open-Drain Combination 140ms (min) after VCC exceeds the thresholds. Internal Open-Drain Pullup Resistors (for external RESET IN2 is monitored as the secondary reset supply VOH voltage connections) and is adjustable with an external resistive-divider net- work. RESET2 is asserted whenever either V Manual Reset Input (MAX6392 only) CC or RESET IN2 is below the selected thresholds. RESET2 Immune to Short Negative VCC Transients remains asserted 140ms (min) or a capacitor-adjustable time period after V 15µA Typical Supply Current CC and RESET IN2 exceed their thresholds. RESET2 is always deasserted Few External Components after RESET1 during system power-up and is alwaysasserted before RESET1 during power-down. Small 8-Pin SOT23 Package The MAX6391 includes two internal pullup resistors for Ordering Information RESET1 and RESET2 (the open-drain outputs can beexternally connected to the desired pullup voltages). PART* TEMP RANGE PIN-PACKAGE The MAX6392 includes an active-low manual reset MAX6391KA_ _-T -40°C to +85°C SOT23-8 input (MR) that asserts both RESET1 (push-pull) andRESET2

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MAX6391-MAX6392.pdf Datasheet