MAX6443MAX6452 P Reset Circuits with Long Manual Reset Setup Period General Description Features Single or Dual-Supply Voltage Monitors The MAX6443MAX6452 low-current microprocessor reset circuits feature single or dual manual reset inputs Precision Factory-Set Reset Thresholds from 1.6V to 4.6V with an extended setup period. Because of the extended Adjustable Threshold to Monitor Voltages Down to setup period, short switch closures (nuisance resets) are 0.63V (MAX6449MAX6452) ignored. Single or Dual Manual Reset Inputs with Extended On all devices, the reset output asserts when any of Setup Period the monitored supply voltages drops below its specified Optional Short Setup Time Manual Reset Input threshold. The reset output remains asserted for the reset (MAX6447/MAX6448 and MAX6451/MAX6452) timeout period (210ms typ) after all monitored supplies Immune to Short Voltage Transients exceed their reset thresholds. The reset output is one- Low 6A Supply Current shot pulse asserted for the reset timeout period (140ms Guaranteed Valid Reset Down to V = 1.0V CC min) when selected manual reset input(s) are held low for Active-Low RESET (Push-Pull or Open-Drain) an extended setup timeout period. These devices ignore Outputs manual reset transitions of less than the extended setup 140ms (min) Reset Timeout Period timeout period. Small SOT143 and SOT23 Packages The MAX6443MAX6448 are single fixed-voltage P AEC-Q100 Qualified (MAX6444US16K/V+T) supervisors. The MAX6443/MAX6444 have a single extended manual reset input. The MAX6445/MAX6446 Ordering Information at end of data sheet. have two extended manual reset inputs. The MAX6447/ MAX6448 have one extended and one immediate manual reset input. The MAX6449MAX6452 have one fixed-threshold P supervisor and one adjustable-threshold P supervisor. The MAX6449/MAX6450 have two delayed manual reset inputs. The MAX6451/MAX6452 have one delayed and Typical Operating Circuit one immediate manual reset input. +3.3V The MAX6443MAX6452 have an active-low RESET with push-pull or open-drain output logic options. These devic- es, offered in small SOT packages, are fully guaranteed V CC V CC over the extended temperature range (-40C to +85C). MAX6444 P Applications MR1 RESET RESET Set-Top Boxes GND GND Consumer Electronics DVD Players Cable/DSL Modems RESET TIMEOUT PERIOD MP3 Players 210ms MR1 SETUP PERIOD Industrial Equipment t MR Automotive MR1 Medical Devices RESET 19-2656 Rev 6 3/18MAX6443MAX6452 P Reset Circuits with Long Manual Reset Setup Period Absolute Maximum Ratings (All voltages referenced to GND.) Operating Temperature Range ........................... -40C to +85C V ........................................................................-0.3V to +6V Junction Temperature ......................................................+150C CC Open-Drain RESET ................................................-0.3V to +6V Storage Temperature Range ............................ -65C to +150C Push-Pull RESET .................................... -0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C CC MR1, MR2, MR2, RSTIN ........................................-0.3V to +6V Soldering Temperature (reflow) Input Current, All Pins ......................................................20mA Lead(Pb)-free...............................................................+260C Continuous Power Dissipation (T = +70C) Containing lead ............................................................+240C A 4-Pin SOT143 (derate 4.0mW/C above +70C) ........320mW 5-Pin SOT23 (derate 7.1mW/C above +70C) ..........571mW 6-Pin SOT23 (derate 8.7mW/C above +70C) ..........696mW Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Electrical Characteristics (V = 1.0V to 5.5V, T = -40C to +85C, unless otherwise specified. Typical values are at T = +25C.) (Note 1) CC A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Voltage Range V 1.0 5.5 V CC V = 5.5V, no load 7 20 CC V Supply Current I A CC CC V = 3.6V, no load 6 16 CC 46 4.50 4.63 4.75 44 4.25 4.38 4.50 31 3.00 3.08 3.15 29 2.85 2.93 3.00 V Reset Threshold V 26 2.55 2.63 2.70 V CC TH 23 2.25 2.32 2.38 22 2.12 2.19 2.25 17 1.62 1.67 1.71 16 1.52 1.58 1.62 Reset Threshold Tempco 60 ppm/C Reset Threshold Hysteresis 2 V mV TH T = 0C to +85C 0.615 0.630 0.645 A RSTIN Threshold V MAX6449MAX6452 V TH-RSTIN T = -40C to +85C 0.610 0.650 A RSTIN Threshold Hysteresis V MAX6449MAX6452 2.5 mV HYST RSTIN Input Current I MAX6449MAX6452 -25 +25 nA RSTIN MAX6449MAX6452, V falling at RSTIN RSTIN to Reset Output Delay 15 s 1mV/s Reset Timeout Period t 140 210 280 ms RP V to RESET Output Delay t V falling at 1mV/s 20 s CC RD CC K 6.72 10.08 13.44 L 4.48 6.72 8.96 Manual Reset Minimum Setup t s MR Period Pulse Width S 2.24 3.36 4.48 T 1.12 1.68 2.24 Maxim Integrated 2 www.maximintegrated.com