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MAX6451 Dataheets PDF



Part Number MAX6451
Manufacturers Maxim Integrated Products
Logo Maxim Integrated Products
Description uP Reset Circuits
Datasheet MAX6451 DatasheetMAX6451 Datasheet (PDF)

19-2656; Rev 1; 1/03 µP Reset Circuits with Long Manual Reset Setup Period General Description The MAX6443–MAX6452 low-current microprocessor reset circuits feature single or dual manual reset inputs with an extended 6.72s setup period. Because of the extended setup period, short switch closures (nuisance resets) are ignored. On all devices, the reset output asserts when any of the monitored supply voltages drops below its specified threshold. The reset output remains asserted for the reset tim.

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19-2656; Rev 1; 1/03 µP Reset Circuits with Long Manual Reset Setup Period General Description The MAX6443–MAX6452 low-current microprocessor reset circuits feature single or dual manual reset inputs with an extended 6.72s setup period. Because of the extended setup period, short switch closures (nuisance resets) are ignored. On all devices, the reset output asserts when any of the monitored supply voltages drops below its specified threshold. The reset output remains asserted for the reset timeout period (210ms typ) after all monitored supplies exceed their reset thresholds. The reset output is one-shot pulse asserted for the reset timeout period (140ms min) when selected manual reset input(s) are held low for an extended setup timeout period of 6.72s. These devices ignore manual reset transitions of less than 6.72s (typ). The MAX6443–MAX6448 are single fixed-voltage µP supervisors. The MAX6443/MAX6444 have a single extended manual reset input. The MAX6445/MAX6446 have two extended manual reset inputs. The MAX6447/ MAX6448 have one extended and one immediate manual reset input. The MAX6449–MAX6452 have one fixed-threshold µP supervisor and one adjustable-threshold µP supervisor. The MAX6449/MAX6450 have two delayed manual reset inputs. The MAX6451/MAX6452 have one delayed and one immediate manual reset input. The MAX6443–MAX6452 have an active-low RESET with push-pull or open-drain output logic options. These devices, offered in small SOT packages, are fully guarwww.DataSheet4U.com anteed over the extended temperature range (-40°C to +85°C). Features o Single- or Dual-Supply Voltage Monitors o Precision Factory-Set Reset Thresholds from 1.6V to 4.6V o Adjustable Threshold to Monitor Voltages Down to 0.63V (MAX6449–MAX6452) o Single or Dual Manual Reset Inputs with Extended 6.72s Setup Period o Optional Short Setup Time Manual Reset Input (MAX6447/MAX6448 and MAX6451/MAX6452) o Immune to Short Voltage Transients o Low 6µA Supply Current o Guaranteed Valid Reset Down to VCC = 1.0V o Active-Low RESET (Push-Pull or Open-Drain) Outputs o 140ms (min) Reset Timeout Period o Small SOT143 and SOT23 Packages MAX6443–MAX6452 Ordering Information PART MAX6443 US_ _L -T MAX6444 US_ _L -T TEMP RANGE -40°C to +85°C -40°C to +85°C PIN-PACKAGE 4 SOT143-4 4 SOT143-4 Applications Set-Top Boxes Consumer Electronics DVD Players Modems MP3 Players Industrial Equipment Automotive Medical Devices Note: The “_ _ ” is a placeholder for the threshold voltage level of the devices. A desired threshold level is set by the two-number suffix found in Table 1. All devices are available in tapeand-reel only. There is a 2500-piece minimum order increment for standard versions (Table 2). Sample stock is typically held on standard versions only. Nonstandard versions require a minimum order increment of 10,000 pieces. Contact factory for availability. Pin Configurations TOP VIEW GND 1 4 VCC MAX6443 MAX6444 RESET 2 3 MR1 SOT143 Pin Configurations continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. µP Reset Circuits with Long Manual Reset Setup Period MAX6443–MAX6452 ABSOLUTE MAXIMUM RATINGS All Voltages Referenced to GND VCC ..........................................................................-0.3V to +6V Open-Drain RESET ..................................................-0.3V to +6V Push-Pull RESET ........................................-0.3V to (VCC + 0.3V) MR1, MR2, MR2, RSTIN ..........................................-0.3V to +6V Input Current, All Pins.......................................................±20mA Continuous Power Dissipation (TA = +70°C) 4-Pin SOT143-4 (derate 4.0mW/°C above +70°C) .....320mW 5-Pin SOT23-5 (derate 7.1mW/°C above +70°C) .......571mW 6-Pin SOT23-6 (derate 8.7mW/°C above +70°C) .......696mW Operating Temperature Range .......................... -40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C 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 (VCC = 1.0V to 5.5V, TA = -40°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.) (Note 1) PARAMETER Operating Voltage Range VCC Supply Current SYMBOL VCC ICC VCC = 5.5V, no load VCC = 3.6V, no load 46 44 31 29 VCC Reset Threshold VTH 26 23 22 17 16 Reset Th.


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