MAX6455:µP Supervisors with Separate VCC Reset and Manual Reset Outputs

µP Supervisors with Separate VCC Reset and Manual Reset Outputs Simplify Set-Top Box Design

The MAX6453–MAX6456 are low-power, dual-voltage µP supervisors featuring separate VCC reset and manual reset outputs. The dual outputs support both soft-system reset (interrupt) and hard-system reset (reboot) functions. The reset output asserts when any of the monitored voltages falls below its specified threshold and remains asserted for the reset timeout (140ms min) after all voltages exceed their respective reset thresholds. All devices are offered with nine factory-fixed reset thresholds for monitoring primary system voltages (VCC) from 1.8V to 5V and an adjustable reset input for monitoring a secondary system voltage down to 0.63V. Each device has a manual reset input, a VCC reset output, and a manual reset output. The MAX6453/MAX6454 manual reset output asserts when the manual reset input is low. It remains asserted for the manual reset timeout period (140ms min) after the manual reset input transitions high. The MAX6453/MAX6454 manual reset input controls only the manual reset output and does not affect the VCC reset output. The manual reset input of the MAX6455/MAX6456 controls both the manual reset and VCC reset outputs. When the manual reset input is low for less than the extended setup timeout period, only the manual reset output asserts and remains asserted for the manual reset timeout period (140ms min) after the manual reset input transitions high. If the manual reset input is low for at least the extended setup timeout period, the reset output also asserts and remains asserted for the reset timeout period (140ms min) after the manual reset input transitions high. This enhanced feature allows the implementation of a soft/hard-system reset combination. The MAX6453/MAX6455 have active-low, push-pull reset and manual reset outputs, and the MAX6454/MAX6456 have active-low, open-drain reset and manual reset outputs. All devices are available in small SOT23-6 packages and are fully specified over the extended temperature range (-40°C to +85°C).

Key Features
  • Precision Factory-Set Reset Thresholds From 1.6V to 4.6V
  • Adjustable Threshold to Monitor Voltages Down to 0.63V
  • Manual Reset Input with Extended Setup Period
  • Immune to Short Voltage Transients
  • Low 6µA Supply Current
  • Guaranteed Valid Reset Down to VCC = 1.0V
  • Active-Low RESET (Push-Pull or Open-Drain) Outputs
  • 140ms (min) Reset Timeout Period
  • Small SOT Package
MAX6453, MAX6454, MAX6455, MAX6456: Functional Diagram
MAX6453, MAX6454, MAX6455, MAX6456: Functional Diagram
Applications/Uses
  • Cable/DSL Modems
  • Consumer Electronics
  • DVD Players
  • Industrial Equipment
  • Medical Devices
  • MP3 Players
  • Set-Top Boxes
DataSheet
titleDownload file
MAX6453-MAX6456 Data SheetMAX6453-MAX6456.pdf
Parametrics
Part NumberMonitored VoltagesManual Reset FeatureMR1 Setup TimeReset Thresh.
(V)
Reset OuttRESETReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
MAX64532Independent Soft and Hard Reset Outputs1µs1.2 to 1.79
1.8 to 2.49
2.5 to 3.29
3.3 to 4.99
Active Low
Push-Pull
85ms to 300ms2.516SOT/6$1.42 @1k
MAX64541µsActive Low
Open Drain
SOT/6$1.56 @1k
MAX64551µs (Soft)
3.36s (Hard)
Active Low
Push-Pull
SOT/6$1.43 @1k
MAX64561µs (Soft)
3.36s (Hard)
Active Low
Open Drain
SOT/6$1.40 @1k
Related Products
  • MAX6468:Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset
  • MAX6467:Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6455UT16S+ActiveSOT,;6 pin;9 mm²-40°C to +85°CLead Free
MAX6455UT16S+TActiveSOT,;6 pin;9 mm²-40°C to +85°CLead Free
MAX6455UT16S-TNo Longer AvailableMAX6455UT16S+TSOT,;6 pin;9 mm²-40°C to +85°CNo
MAX6455UT17S+TActiveSOT;-40°C to +85°CSee data sheet
MAX6455UT17S-TNo Longer AvailableMAX6455UT17S+SOT,;6 pin;9 mm²-40°C to +85°CNo
MAX6455UT22S+TActiveSOT;-40°C to +85°CSee data sheet
MAX6455UT22S-TNo Longer AvailableMAX6455UT22S+SOT,;6 pin;9 mm²-40°C to +85°CNo
MAX6455UT23S+TActiveSOT,;6 pin;9 mm²-40°C to +85°CLead Free
MAX6455UT23S-TNo Longer AvailableMAX6455UT23S+TSOT,;6 pin;9 mm²-40°C to +85°CNo
MAX6455UT26L+TActiveSOT,;6 pin;9 mm²-40°C to +85°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6455UT26S+ActiveSOT,;6 pin;9 mm²-40°C to +85°CLead Free
MAX6455UT26S+TActiveSOT,;6 pin;9 mm²-40°C to +85°CLead Free
MAX6455UT26S-TNo Longer AvailableMAX6455UT26S+TSOT,;6 pin;9 mm²-40°C to +85°CNo
MAX6455UT29K+TActiveSOT,;6 pin;9 mm²-40°C to +85°CLead Free
MAX6455UT29S+ActiveSOT,;6 pin;9 mm²-40°C to +85°CLead Free
MAX6455UT29S+TActiveSOT,;6 pin;9 mm²-40°C to +85°CLead Free
MAX6455UT29S-TNo Longer AvailableMAX6455UT29S+TSOT,;6 pin;9 mm²-40°C to +85°CNo
MAX6455UT31S+TActiveSOT,;6 pin;9 mm²-40°C to +85°CLead Free
MAX6455UT31S-TNo Longer AvailableMAX6455UT31S+TSOT,;6 pin;9 mm²-40°C to +85°CNo
MAX6455UT44S+TActiveSOT;-40°C to +85°CSee data sheet
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6455UT44S-TNo Longer AvailableMAX6455UT44S+SOT,;6 pin;9 mm²-40°C to +85°CNo
MAX6455UT46S+ActiveSOT,;6 pin;9 mm²-40°C to +85°CLead Free
MAX6455UT46S+TActiveSOT,;6 pin;9 mm²-40°C to +85°CLead Free
MAX6455UT46S-TNo Longer AvailableMAX6455UT46S+TSOT,;6 pin;9 mm²-40°C to +85°CNo
MAX6453-MAX6456.pdf MAX6456
功能框图 MAX6456