MAX6835

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


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Description

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.
MAX6832, MAX6833, MAX6834, MAX6835, MAX6836, MAX6837, MAX6838, MAX6839, MAX6840: Typical Operating Circuit MAX6832, MAX6833, MAX6834, MAX6835, MAX6836, MAX6837, MAX6838, MAX6839, MAX6840: Typical Operating Circuit Enlarge+

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

Applications/Uses

  • Computers: Desktop, Workstation, Server
  • Controllers
  • Critical µP and µC Power Monitoring
  • Intelligent Instruments
  • Portable Battery-Powered Equipment
Part NumberReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
MAX6832 
0 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-1.513
SC70/3
SC70/4
-
MAX6833 
0 to 1.2
1.2 to 1.8
Active High
Push-Pull
-1.5
SC70/3
-
MAX6834 
0 to 1.2
1.2 to 1.8
Active Low
Open Drain
-1.5
SC70/3
$1.16 @1k
MAX6835 
0 to 1.2
1.2 to 1.8
Active Low
Push-Pull
Manual Reset2.5
SC70/4
$1.42 @1k
MAX6836 
0 to 1.2
1.2 to 1.8
Active High
Push-Pull
Manual Reset1.5
SC70/4
-
MAX6837 
0 to 1.2
1.2 to 1.8
Active Low
Open Drain
Manual Reset1.5
SC70/4
$1.16 @1k
MAX6838 
0 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 Input1.5
SC70/4
$1.16 @1k
MAX6839 
0 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 Input2.5
SC70/4
-
MAX6840 
0 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 Input2.5
SC70/4
$1.42 @1k
See All Supervisors (1 Monitored Voltage) (258)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Quality and Environmental Data

Request Reliability Report for: MAX6835 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX6835FXSD3+
  • MAX6835FXSD3+T
  • MAX6835VXSD0+
  • MAX6835VXSD0+T
  • MAX6835VXSD1+
  • MAX6835VXSD1+T
  • MAX6835VXSD3+
  • MAX6835VXSD3+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
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