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Dual-Voltage µP Supervisory Circuits with Sequenced Reset Outputs

Product Details

Key Features

Parametric specs for Supervisors (2 Monitored Voltages)
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) 1.5
Reset Out Active Low
Open Drain
tRESET (min) 85ms to 300ms
300ms to 1s
>1s
Adjustable
Watchdog Feature No Watchdog
Supervisor Features Adjustable Reset Input
ICC (µA) (max) 25
Package/Pins SOT23/8
Budgetary
Price (See Notes)
2.03
Parametric specs for Power-Supply Sequencers and Voltage Trackers
# Input Channels 2
Interface Factory Fixed
R/C Adjustable
Option Sequence
VIN (V) (max) <6
Oper. Temp. (°C) -40 to +85
0 to +70
Package/Pins SOT23/8
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Simplified Block Diagram

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Parameters

Parametric specs for Supervisors (2 Monitored Voltages)
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) 1.5
Reset Out Active Low
Open Drain
tRESET (min) 85ms to 300ms
300ms to 1s
>1s
Adjustable
Watchdog Feature No Watchdog
Supervisor Features Adjustable Reset Input
ICC (µA) (max) 25
Package/Pins SOT23/8
Budgetary
Price (See Notes)
2.03
Parametric specs for Power-Supply Sequencers and Voltage Trackers
# Input Channels 2
Interface Factory Fixed
R/C Adjustable
Option Sequence
VIN (V) (max) <6
Oper. Temp. (°C) -40 to +85
0 to +70
Package/Pins SOT23/8

Key Features

  • Preset VCC Reset Threshold Voltages from 1.58V to 4.63V (master supply)
  • Customer-Adjustable RESET IN2 to Monitor Voltages Down to 625mV (secondary supply)
  • Fixed (140ms min) active-low RESET1 Timeout
  • Fixed (140ms min) or Customer-Adjustable active-low RESET2 Timeout Period
  • Guaranteed Reset Valid to VCC = 1V
  • Active-Low Open-Drain Outputs or Push-Pull/Open-Drain Combination
  • Internal Open-Drain Pullup Resistors (for external VOH voltage connections)
  • Manual Reset Input (MAX6392 only)
  • Immune to Short Negative VCC Transients
  • 15µA Typical Supply Current
  • Few External Components
  • Small 8-Pin SOT23 Package
  • Applications/Uses

    • Computers: Desktop, Workstation, Server
    • Controllers
    • Critical µP Monitoring
    • Industrial Equipment
    • Multivoltage Monitoring
    • Printers
    • Servers and Workstations
    • Set-Top Boxes

    Description

    The MAX6391/MAX6392 microprocessor (µP) supervisory circuits provide sequenced logic reset outputs for multicomponent or dual-voltage systems. Each device can monitor two supply voltages and time-sequence two reset outputs to control the order in which system components are turned on and off. The MAX6391/MAX6392 increase system reliability and reduce circuit complexity and cost compared to separate ICs or discrete components.

    The MAX6391/MAX6392 monitor VCC as the master reset supply. Both active-low RESET1 and active-low RESET2 are asserted whenever VCC drops below the selected factory-fixed reset threshold voltage. RESET1 remains asserted as long as VCC is below the threshold and deasserts 140ms (min) after VCC exceeds the thresholds.

    RESET IN2 is monitored as the secondary reset supply and is adjustable with an external resistive-divider network. Active-low RESET2 is asserted whenever either VCC or RESET IN2 is below the selected thresholds. Active-low RESET2 remains asserted 140ms (min) or a capacitor-adjustable time period after VCC and RESET IN2 exceed their thresholds. RESET2 is always deasserted after active-low RESET1 during system power-up and is always asserted before active-low RESET1 during power-down.

    The MAX6391 includes two internal pullup resistors for active-low RESET1 and active-low RESET2 (the open-drain outputs can be externally connected to the desired pullup voltages). The MAX6392 includes an active-low manual reset input (MR) that asserts both active-low RESET1 (push-pull) and RESET2 (open drain).

    The MAX6391/MAX6392 are available in small 8-pin SOT23 packages and are specified over the -40°C to +85°C extended temperature range.

    Simplified Block Diagram

    MAX6391, MAX6392: Typical Operating Circuit MAX6391, MAX6392: 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 .

    Sampling:
    Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.