MAX6797A:Dual/Triple, Ultra-Low-Voltage, SOT23 µP Supervisory Circuits

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

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.

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
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
Applications/Uses
  • Computers/Servers
  • Industrial Equipment
  • Multivoltage Systems
  • Portable Battery-Powered Equipment
  • Printers/Fax Machines
  • Set-Top Boxes
  • Telecom/Networking Equipment
DataSheet
titleDownload file
MAX6715A-MAX6797A Data SheetMAX6715A-MAX6797A.pdf
Parametrics
Part NumberInterfaceReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureWatchdog TimeoutSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
MAX6715AFactory Fixed0 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
1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s
>1s
No Watchdog-Manual Reset2.539SOT/6$1.39 @1k
MAX6716AActive Low
Push-Pull
No Watchdog-Manual ResetSOT/6$3.21 @1k
MAX6717AActive Low
Open Drain
No Watchdog-Manual ResetSOT/5$1.16 @1k
MAX6718AActive Low
Push-Pull
No Watchdog-Manual ResetSOT/5$1.39 @1k
MAX6721AActive Low
Open Drain
Extended Setup Period
Input (WDI)
1s to 2s
>2s
Manual ResetSOT/6$3.21 @1k
MAX6722AActive Low
Push-Pull
Extended Setup Period
Input (WDI)
1s to 2s
>2s
Manual ResetSOT/6$3.21 @1k
MAX6728AActive Low
Open Drain
Extended Setup Period
Input (WDI)
1s to 2s
>2s
Adjustable Reset Input
Manual Reset
Power Fail Comparator/Low Battery Detect
SOT/8$1.39 @1k
MAX6729AActive Low
Push-Pull
Extended Setup Period
Input (WDI)
1s to 2s
>2s
Adjustable Reset Input
Manual Reset
Power Fail Comparator/Low Battery Detect
SOT/8$1.77 @1k
MAX6797AActive Low
Push-Pull
Extended Setup Period
Input (WDI)
1s to 2s
>2s
Adjustable Reset Input
Manual Reset
Power Fail Comparator/Low Battery Detect
SOT/8$2.04 @1k

Part NumberInterfaceReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureWatchdog TimeoutSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
MAX6719AFactory Fixed0 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
1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s
>1s
No Watchdog-Adjustable Reset Input
Manual Reset
2.539SOT/6$1.59 @1k
MAX6720AActive Low
Push-Pull
No Watchdog-Adjustable Reset Input
Manual Reset
SOT/6$1.59 @1k
MAX6723AActive Low
Open Drain
Extended Setup Period
Input (WDI)
1s to 2s
>2s
Adjustable Reset InputSOT/6$3.21 @1k
MAX6724AActive Low
Push-Pull
Extended Setup Period
Input (WDI)
1s to 2s
>2s
Adjustable Reset InputSOT/6$3.21 @1k
MAX6725AActive High
Active Low
Open Drain
Extended Setup Period
Input (WDI)
1s to 2s
>2s
Adjustable Reset Input
Manual Reset
SOT/8$1.39 @1k
MAX6726AActive High
Active Low
Push-Pull
Extended Setup Period
Input (WDI)
1s to 2s
>2s
Adjustable Reset Input
Manual Reset
SOT/8$3.21 @1k
MAX6727AActive Low
Open Drain
Extended Setup Period
Input (WDI)
1s to 2s
>2s
Adjustable Reset Input
Manual Reset
SOT/8$3.21 @1k
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6797AKATWD8+ActiveSOT,;8 pin;9 mm²-40°C to +125°CLead Free
MAX6797AKATWD8+TActiveSOT,;8 pin;9 mm²-40°C to +125°CLead Free
MAX6715A-MAX6797A.pdf MAX6727A
MAX6715A-MAX6797A.pdf MAX6797A