MAX6745:Low-Power Dual-/Triple-Voltage SC70 µP Supervisory Circuits

Low-Power, Dual-/Triple-Voltage SC70 µP Supervisory Circuits are Ideal for Portable Equipment

The MAX6736–MAX6745 are low-power dual-/triple-voltage microprocessor (µP) supervisors. These devices assert a 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 reduce size and power compared to separate ICs or discrete components. The low supply current of 6µA makes these devices ideal for portable equipment. The MAX6736/MAX6737 are dual fixed-voltage µP supervisors with a manual reset input. The MAX6738/MAX6739 have one fixed and one adjustable reset threshold and a manual reset input. The MAX6740/MAX6743 are triple-voltage µP supervisors with two fixed and one user-adjustable reset threshold inputs. The MAX6741/MAX6744 are dual-voltage µP supervisors with a power-OK (POK) output ideal for power-supply sequencing. The MAX6742/MAX6745 monitor the primary VCC supply and have an independent power-fail comparator. The MAX6736–MAX6745 monitor I/O supply voltages (VCC1) from 1.8V to 5.0V and core supply voltages (VCC2) from 0.9V to 3.3V with factory-trimmed reset threshold voltage options (Table 1). An external adjustable RSTIN input option allows monitoring voltages down to 0.5V. A variety of push-pull or open-drain reset outputs along with manual reset input and power-fail input/output features are available (see the Selector Guide). The MAX6736–MAX6745 are offered in a space-saving 5-pin SC70 package and operate over the -40°C to +85°C temperature range.

Key Features
  • Dual-/Triple-Supply Reset Voltage Monitors
  • Precision Factory-Set Reset Thresholds for Monitoring from 0.9V to 5.0V
  • Adjustable Reset Input Down to 0.488V
  • 150ms and 1200ms (min) Reset Timeout Period Options
  • VCC1 Power-OK Output for Power-Supply Sequencing Applications (MAX6741/MAX6744)
  • Power-Fail Input/Power-Fail Output (MAX6742/MAX6745)
  • 6µA Supply Current
  • Tiny SC70 Package
MAX6736, MAX6737, MAX6738, MAX6739, MAX6740, MAX6741, MAX6742, MAX6743, MAX6744, MAX6745: Functional Diagram
MAX6736, MAX6737, MAX6738, MAX6739, MAX6740, MAX6741, MAX6742, MAX6743, MAX6744, MAX6745: Functional Diagram
Applications/Uses
  • Controllers
  • GPS Equipment
  • Multivoltage Systems
  • Notebook Computers
  • PDAs
  • Portable Battery-Powered Equipment
  • POS Equipment
DataSheet
titleDownload file
MAX6736-MAX6745 Data SheetMAX6736-MAX6745.pdf
Parametrics
Part NumberOptionInterfaceInput Chan.VIN
(V)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
maxSee Notes
MAX6741SequenceFactory Fixed
R/C Adjustable
2<6-40 to +85
0 to +70
SC-70/5$1.62 @1k
MAX6744SC-70/5$1.44 @1k

Part NumberReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
MAX67450 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
85ms to 300ms
>1s
No WatchdogPower Fail Comparator/Low Battery Detect310SC-70/5$1.59 @1k

Part NumberInterfaceReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
MAX6736Factory 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
85ms to 300ms
>1s
No WatchdogManual Reset312SC-70/5$1.19 @1k
MAX6737Factory FixedActive Low
Push-Pull
Manual Reset12SC-70/5$1.19 @1k
MAX6738Factory Fixed
R/C Adjustable
Active Low
Open Drain
Adjustable Reset Input
Manual Reset
10SC-70/5$1.48 @1k
MAX6741Factory Fixed
R/C Adjustable
Active Low
Open Drain
Manual Reset12SC-70/5$1.62 @1k
MAX6744Factory Fixed
R/C Adjustable
Active Low
Push-Pull
-12SC-70/5$1.44 @1k

Part NumberInterfaceReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
MAX6740Factory Fixed
R/C Adjustable
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
85ms to 300ms
>1s
No WatchdogAdjustable Reset Input
Manual Reset
312SC-70/5$1.38 @1k
MAX6743Active Low
Push-Pull
Adjustable Reset InputSC-70/5$1.39 @1k
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6745XKLD3+TActiveSC-70,;5 pin;5.3 mm²-40°C to +85°CLead Free
MAX6745XKLD3-TActiveSC-70,;5 pin;5.3 mm²-40°C to +85°CNo
MAX6745XKLD7-TNo Longer AvailableSC-70,;5 pin;5.3 mm²-40°C to +85°CNo
MAX6745XKMD3-TActiveSC-70,;5 pin;5.3 mm²-40°C to +85°CNo
MAX6745XKMD7-TActiveSC-70,;5 pin;5.3 mm²-40°C to +85°CNo
MAX6745XKRD3+ActiveSC-70,;5 pin;5.3 mm²-40°C to +85°CLead Free
MAX6745XKRD3+TActiveSC-70,;5 pin;5.3 mm²-40°C to +85°CLead Free
MAX6745XKRD3-TNo Longer AvailableMAX6745XKRD3+TSC-70,;5 pin;5.3 mm²-40°C to +85°CNo
MAX6745XKRD7-TActiveSC-70,;5 pin;5.3 mm²-40°C to +85°CNo
MAX6745XKSD3+ActiveSC-70,;5 pin;5.3 mm²-40°C to +85°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6745XKSD3+TActiveSC-70,;5 pin;5.3 mm²-40°C to +85°CLead Free
MAX6745XKSD3-TNo Longer AvailableMAX6745XKSD3+TSC-70,;5 pin;5.3 mm²-40°C to +85°CNo
MAX6745XKSD7-TActiveSC-70,;5 pin;5.3 mm²-40°C to +85°CNo
MAX6745XKTD3-TActiveSC-70,;5 pin;5.3 mm²-40°C to +85°CNo
MAX6745XKTD7-TActiveSC-70,;5 pin;5.3 mm²-40°C to +85°CNo
MAX6745XKVD3+TActiveSC-70,;5 pin;5.3 mm²-40°C to +85°CLead Free
MAX6745XKVD3-TNo Longer AvailableMAX6745XKVD3+TSC-70,;5 pin;5.3 mm²-40°C to +85°CNo
MAX6745XKVD7-TActiveSC-70,;5 pin;5.3 mm²-40°C to +85°CNo
MAX6745XKWD3-TNo Longer AvailableSC-70,;5 pin;5.3 mm²-40°C to +85°CNo
MAX6745XKWD7-TActiveSC-70,;5 pin;5.3 mm²-40°C to +85°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6745XKYD3-TActiveSC-70,;5 pin;5.3 mm²-40°C to +85°CNo
MAX6745XKYD7-TActiveSC-70,;5 pin;5.3 mm²-40°C to +85°CNo
MAX6745XKZD3+ActiveMAX6745XKZD3+TSC-70,;5 pin;5.3 mm²-40°C to +85°CLead Free
MAX6745XKZD3+TActiveSC-70,;5 pin;5.3 mm²-40°C to +85°CLead Free
MAX6745XKZD3-TNo Longer AvailableMAX6745XKZD3+TSC-70,;5 pin;5.3 mm²-40°C to +85°CNo
MAX6745XKZD7-TActiveSC-70,;5 pin;5.3 mm²-40°C to +85°CNo
MAX6736-MAX6745.pdf MAX6744
MAX6736-MAX6745.pdf MAX6744