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Dual/Triple, Ultra-Low-Voltage, SOT23 µP Supervisory Circuits

Dual/Triple-Voltage, µP Supervisors with Watchdog, Manual Reset Input, and/or Power-Fail Comparator

Product Details

Key Features

Parametric specs for Supervisors (3 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) 2.5
Reset Out Active High
Active Low
Open Drain
Interface Factory Fixed
tRESET (min) 1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s
>1s
Watchdog Feature Extended Setup Period
Input (WDI)
Watchdog Timeout 1s to 2s
>2s
Supervisor Features Adjustable Reset Input
Manual Reset
ICC (µA) (max) 39
Package/Pins SOT23/8
Budgetary
Price (See Notes)
1.81
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Simplified Block Diagram

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Parameters

Parametric specs for Supervisors (3 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) 2.5
Reset Out Active High
Active Low
Open Drain
Interface Factory Fixed
tRESET (min) 1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s
>1s
Watchdog Feature Extended Setup Period
Input (WDI)
Watchdog Timeout 1s to 2s
>2s
Supervisor Features Adjustable Reset Input
Manual Reset
ICC (µA) (max) 39
Package/Pins SOT23/8
Budgetary
Price (See Notes)
1.81

Key Features

  • VCC1 (Primary Supply) Reset Threshold Voltages from 1.58V to 4.63V
  • VCC2 (Secondary Supply) Reset Threshold Voltages from 0.79V to 3.08V
  • Externally Adjustable RSTIN Threshold for Auxiliary/Triple-Voltage Monitoring (0.62V Internal Reference)
  • Watchdog Timer Option
    • 35s (min) Long Startup Period
    • 1.12s (min) Normal Timeout Period
  • Manual-Reset Input Option
  • Power-Fail Input/Power-Fail Output Option (Push-Pull and Open-Drain Active-Low)
  • Guaranteed Reset Valid Down to VCC1 or VCC2 = 0.8V
  • Reset Output Logic Options
  • Immune to Short VCC Transients
  • Low Supply Current 14µA (typ) at 3.6V
  • Watchdog Disable Feature
  • Small 5-, 6-, and 8-Pin SOT23 Packages
  • AEC-Q100 Qualified: MAX6719AUTTWD1/V+T

Applications/Uses

  • Computers/Servers
  • Industrial Equipment
  • Multivoltage Systems
  • Portable Battery-Powered Equipment
  • Printers/Fax Machines
  • Set-Top Boxes
  • Telecom/Networking Equipment

Description

The MAX6715A–MAX6729A/MAX6797A are ultra-low-voltage microprocessor (µP) supervisory circuits designed to monitor two or three system power-supply voltages. These devices assert a system reset if any monitored supply falls below its factory-trimmed or adjustable threshold and maintain reset for a minimum timeout period after all supplies rise above their thresholds. The integrated dual/triple supervisory circuits significantly improve system reliability and reduce size compared to separate ICs or discrete components.

These devices monitor primary supply voltages (VCC1) from 1.8V to 5.0V and secondary supply voltages (VCC2) from 0.9V to 3.3V with factory-trimmed reset threshold voltage options (see the Reset Voltage Threshold Suffix Guide in the full data sheet). An externally adjustable RSTIN input option allows customers to monitor a third supply voltage down to 0.62V. These devices are guaranteed to be in the correct reset output logic state when either VCC1 or VCC2 remains greater than 0.8V.

A variety of push-pull or open-drain reset outputs along with watchdog input, manual-reset input, and power-fail input/output features are available (see the Selector Guide in the full data sheet). Select reset timeout periods from 1.1ms to 1120ms (min) (see the Reset Timeout Period Suffix Guide in the full data sheet). The MAX6715A–MAX6729A/MAX6797A are available in small 5-, 6-, and 8-pin SOT23 packages and operate over the -40°C to +125°C temperature range.

Simplified Block Diagram

MAX6715A, MAX6716A, MAX6717A, MAX6718A, MAX6719A, MAX6720A, MAX6721A, MAX6722A, MAX6723A, MAX6724A, MAX6725A, MAX6726A, MAX6727A, MAX6728A, MAX6729A: Typical Operating Circuit MAX6715A, MAX6716A, MAX6717A, MAX6718A, MAX6719A, MAX6720A, MAX6721A, MAX6722A, MAX6723A, MAX6724A, MAX6725A, MAX6726A, MAX6727A, MAX6728A, MAX6729A: 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.