MAX6839:Ultra-Low-Voltage SC70 Voltage Detectors and µP Reset Circuits

The MAX6832–MAX6840 are microprocessor (µP) supervisory circuits used to monitor low-voltage power supplies in µP and digital systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with +1.2V to +1.8V powered circuits. These devices assert a reset signal whenever the VCC supply voltage declines below a preset threshold or whenever manual reset (active-low MR) is asserted. Reset remains asserted for a fixed timeout delay after VCC has risen above the reset threshold or when manual reset is deasserted. Five different timeout periods are available: 70µs (voltage detector), 1.5ms, 30ms, 210ms, and 1.68s. Reset thresholds suitable for operation with a variety of supply voltages are available. The MAX6832/MAX6835/MAX6838 have a push-pull active-low reset output (active-low RESET). The MAX6833/MAX6836/MAX6839 have a push-pull active-high reset output (RESET) and the MAX6834/MAX6837/MAX6840 have an open-drain active-low reset output (active-low RESET). The open-drain active-low reset output requires a pullup resistor that can be connected to a voltage higher than VCC. The MAX6835/MAX6836/MAX6837 feature a debounced manual reset input (active-low MR), while the MAX6838/MAX6839/MAX6840 provide a RESET-IN input allowing the user to externally adjust the reset threshold. The reset comparator is designed to ignore fast transients on VCC. Low supply current of 7.5µA makes the MAX6832–MAX6840 ideal for use in portable equipment. These devices are available in 3- and 4-pin SC70 packages.

Key Features
  • Factory-Set Reset Threshold Voltages for Nominal Supplies from 1.2V to 1.8V
  • Low Power Consumption: 7.5µA (typ)
  • Space-Saving 3- and 4-Pin SC70 Packages
  • ±2.5% Reset Threshold Accuracy Over Temperature
  • Five Different Timeout Periods Available: 70µs (voltage detector), 1.5ms, 30ms, 210ms, and 1.68s
  • Three Reset Output Configurations
    • Push-Pull active-low RESET
    • Push-Pull RESET
    • Open-Drain active-low RESET
  • Guaranteed Reset Valid to VCC =
    • 0.55V—Active-Low
    • 0.75V—Active-High
  • Adjustable Threshold Reset-In Option
  • Manual Reset Input Option
  • Immune to Short Negative VCC Transients
  • Pin Compatible with MAX803/MAX809/MAX810, MAX6711/MAX6712/MAX6713, and MAX6381–MAX6390 Series
MAX6832, MAX6833, MAX6834, MAX6835, MAX6836, MAX6837, MAX6838, MAX6839, MAX6840: Typical Operating Circuit
MAX6832, MAX6833, MAX6834, MAX6835, MAX6836, MAX6837, MAX6838, MAX6839, MAX6840: Typical Operating Circuit
Applications/Uses
  • Computers: Desktop, Workstation, Server
  • Controllers
  • Critical µP and µC Power Monitoring
  • Intelligent Instruments
  • Portable Battery-Powered Equipment
DataSheet
titleDownload file
MAX6832-MAX6840 Data SheetMAX6832-MAX6840.pdf
Parametrics
Part NumberReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
MAX68320 to 1.2
1.2 to 1.8
Active Low
Push-Pull
1ms to 15ms
15ms to 85ms
85ms to 300ms
<1ms
>1s
No Watchdog-1.513SC-70/3$1.16 @1k
MAX68330 to 1.2
1.2 to 1.8
Active High
Push-Pull
-1.5SC-70/3$1.13 @1k
MAX68340 to 1.2
1.2 to 1.8
Active Low
Open Drain
-1.5SC-70/3$1.16 @1k
MAX68350 to 1.2
1.2 to 1.8
Active Low
Push-Pull
Manual Reset2.5SC-70/4$1.42 @1k
MAX68360 to 1.2
1.2 to 1.8
Active High
Push-Pull
Manual Reset1.5SC-70/4$1.54 @1k
MAX68370 to 1.2
1.2 to 1.8
Active Low
Open Drain
Manual Reset1.5SC-70/4$1.16 @1k
MAX68380 to 1.2
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active Low
Push-Pull
Adjustable Reset Input1.5SC-70/4$1.16 @1k
MAX68390 to 1.2
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active High
Push-Pull
Adjustable Reset Input2.5SC-70/4$1.13 @1k
MAX68400 to 1.2
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active Low
Open Drain
Adjustable Reset Input2.5SC-70/4$1.42 @1k
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6839XSD0+ActiveSC-70,;4 pin;5.4 mm²-40°C to +85°CLead Free
MAX6839XSD0+TActiveSC-70,;4 pin;5.4 mm²-40°C to +85°CLead Free
MAX6839XSD0-TNo Longer AvailableMAX6839XSD0+TSC-70,;4 pin;5.4 mm²-40°C to +85°CNo
MAX6839XSD1+TActiveSC70;-40°C to +85°CSee data sheet
MAX6839XSD1-TActiveSC-70,;4 pin;5.4 mm²-40°C to +85°CNo
MAX6839XSD2+TActiveSC-70,;4 pin;5.4 mm²-40°C to +85°CLead Free
MAX6839XSD2-TActiveSC-70,;4 pin;5.4 mm²-40°C to +85°CNo
MAX6839XSD3+TActiveSC-70,;4 pin;5.4 mm²-40°C to +85°CLead Free
MAX6839XSD3-TNo Longer AvailableMAX6839XSD3+TSC-70,;4 pin;5.4 mm²-40°C to +85°CNo
MAX6839XSD4+TActiveSC70;-40°C to +85°CSee data sheet
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6839XSD4-TActiveSC-70,;4 pin;5.4 mm²-40°C to +85°CNo
MAX6832-MAX6840.pdf MAX6840
典型工作电路 MAX6840