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

Product Details

Key Features

Parametric specs for Supervisors (1 Monitored Voltage)
Reset Thresh. (V) 0 to 1.2
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Reset Thresh. Accur. (%) (@ +25°C) 2.5
Reset Out Active Low
Open Drain
tRESET (min) 1ms to 15ms
15ms to 85ms
85ms to 300ms
<1ms
>1s
Watchdog Feature No Watchdog
Supervisor Features Adjustable Reset Input
ICC (µA) (max) 13
Package/Pins SC70/4
Budgetary
Price (See Notes)
1.58
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Simplified Block Diagram

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Parameters

Parametric specs for Supervisors (1 Monitored Voltage)
Reset Thresh. (V) 0 to 1.2
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Reset Thresh. Accur. (%) (@ +25°C) 2.5
Reset Out Active Low
Open Drain
tRESET (min) 1ms to 15ms
15ms to 85ms
85ms to 300ms
<1ms
>1s
Watchdog Feature No Watchdog
Supervisor Features Adjustable Reset Input
ICC (µA) (max) 13
Package/Pins SC70/4
Budgetary
Price (See Notes)
1.58

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

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.

Simplified Block Diagram

MAX6832, MAX6833, MAX6834, MAX6835, MAX6836, MAX6837, MAX6838, MAX6839, MAX6840: Typical Operating Circuit MAX6832, MAX6833, MAX6834, MAX6835, MAX6836, MAX6837, MAX6838, MAX6839, MAX6840: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .