MAX6326:3-Pin, Ultra-Low-Power SC70/SOT µP Reset Circuits

Industry's Lowest-Power Reset IC Consumes Only 500nA with No External Components Required

The MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348 microprocessor (µP) supervisory circuits monitor the power supplies in µP and digital systems. These devices provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with 2.5V, 3V, 3.3V, and 5V powered circuits. These circuits perform a single function: they assert a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least 100ms after VCC has risen above the reset threshold. The only difference between the devices is their output. The MAX6326/MAX6346 (push-pull) and MAX6328/MAX6348 (open-drain) have an active-low reset output. The MAX6327/MAX6347 have an active-high push-pull reset output. All of these parts are guaranteed to be in the correct state for VCC down to 1V. The reset comparator is designed to ignore fast transients on VCC. Reset thresholds are factory-trimmable between 2.2V and 4.63V, in approximately 100mV increments. Twenty-one standard versions are available. Contact the factory for availability of nonstandard versions. Ultra-low supply currents (1µA max for the MAX6326/MAX6327/MAX6328) make these parts ideal for use in portable equipment. All six devices are available in space-saving SOT23 and SC70 packages.

Key Features
  • Ultra-Low 1µA (max) Supply Current (MAX6326/MAX6327/MAX6328)
  • Precision Monitoring of 2.5V, 3V, 3.3V, and 5V Power-Supply Voltages
  • Reset Thresholds Available from 2.2V to 4.63V
  • Fully Specified Over Temperature
  • 100ms (min) Power-On Reset Pulse Width
  • Low Cost
  • Available in Three Versions: Push-Pull Active-Low RESET, Push-Pull RESET, and Open-Drain Active-Low RESET
  • Power-Supply Transient Immunity
  • No External Components
  • 3-Pin SC70/SOT23 Packages
  • Pin Compatible with MAX803/MAX809/MAX810
MAX6326, MAX6327, MAX6328, MAX6346, MAX6347, MAX6348: Pin Configuration
MAX6326, MAX6327, MAX6328, MAX6346, MAX6347, MAX6348: Pin Configuration
Applications/Uses
  • Computers: Desktop, Workstation, Server
  • Controllers
  • Critical µP and µC Power Monitoring
  • Intelligent Instruments
  • Portable Battery-Powered Equipment
DataSheet
titleDownload file
MAX6326-MAX6348 Data SheetMAX6326-MAX6348.pdf
Parametrics
Part NumberReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
MAX63261.8 to 2.5
2.5 to 3.3
Active Low
Push-Pull
85ms to 300msNo Watchdog1.51SC-70/3
SOT/3
$1.16 @1k
MAX63271.8 to 2.5
2.5 to 3.3
Active High
Push-Pull
1SC-70/3
SOT/3
$1.47 @1k
MAX63281.8 to 2.5
2.5 to 3.3
Active Low
Open Drain
1SC-70/3
SOT/3
$1.16 @1k
MAX63463.3 to 5.5Active Low
Push-Pull
1.75SC-70/3
SOT/3
$1.16 @1k
MAX63473.3 to 5.5Active High
Push-Pull
1.75SC-70/3
SOT/3
$1.88 @1k
MAX63483.3 to 5.5Active Low
Open Drain
1.75SC-70/3
SOT/3
$1.16 @1k
Quality and Environmental Data
Related Products
  • MAX6333:3-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits
  • MAX6332:3-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits
  • MAX6334:3-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits
  • MAX6335:4-Pin, Ultra Low-Voltage, Low-Power µP Reset Circuits with Manual Reset
  • MAX6336:4-Pin, Ultra Low-Voltage, Low-Power µP Reset Circuits with Manual Reset
  • MAX6337:4-Pin, Ultra Low-Voltage, Low-Power µP Reset Circuits with Manual Reset
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6326UR22No Longer AvailableMAX6326UR22+SOT,;3 pin;8 mm²-40°C to +85°CNo
MAX6326UR22+ActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX6326UR22+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX6326UR22-TNo Longer AvailableMAX6326UR22+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX6326UR23+ActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX6326UR23+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX6326UR23-TNo Longer AvailableMAX6326UR23+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX6326UR24+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX6326UR24-TNo Longer AvailableMAX6326UR24+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX6326UR25No Longer AvailableMAX6326UR25+SOT,;3 pin;8 mm²-40°C to +85°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6326UR25+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX6326UR25-TNo Longer AvailableMAX6326UR25+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX6326UR26+ActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX6326UR26+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX6326UR26-TNo Longer AvailableMAX6326UR26+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX6326UR27+ActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX6326UR27+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX6326UR27-TNo Longer AvailableMAX6326UR27+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX6326UR28+ActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX6326UR28+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6326UR28-TNo Longer AvailableMAX6326UR28+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX6326UR29+ActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX6326UR29+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX6326UR29-TNo Longer AvailableMAX6326UR29+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX6326UR30+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX6326UR30-TNo Longer AvailableMAX6326UR30+TSOT,;3 pin;8 mm²-40°C to +85°CNo
MAX6326UR31No Longer AvailableMAX6326UR31+SOT,;3 pin;8 mm²-40°C to +85°CNo
MAX6326UR31+ActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX6326UR31+TActiveSOT,;3 pin;8 mm²-40°C to +85°CLead Free
MAX6326UR31-TNo Longer AvailableMAX6326UR31+TSOT,;3 pin;8 mm²-40°C to +85°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6326XR22+ActiveSC-70,;3 pin;5.3 mm²-40°C to +85°CLead Free
MAX6326XR22+TActiveSC-70,;3 pin;5.3 mm²-40°C to +85°CLead Free
MAX6326XR22-TNo Longer AvailableMAX6326XR22+TSC-70,;3 pin;5.3 mm²-40°C to +85°CNo
MAX6326XR23+ActiveSC-70,;3 pin;5.3 mm²-40°C to +85°CLead Free
MAX6326XR23+TActiveSC-70,;3 pin;5.3 mm²-40°C to +85°CLead Free
MAX6326XR23-TNo Longer AvailableMAX6326XR23+TSC-70,;3 pin;5.3 mm²-40°C to +85°CNo
MAX6326XR24+ActiveSC-70,;3 pin;5.3 mm²-40°C to +85°CLead Free
MAX6326XR24+TActiveSC-70,;3 pin;5.3 mm²-40°C to +85°CLead Free
MAX6326XR24-TNo Longer AvailableMAX6326XR24+TSC-70,;3 pin;5.3 mm²-40°C to +85°CNo
MAX6326XR25+ActiveSC-70,;3 pin;5.3 mm²-40°C to +85°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6326XR25+TActiveSC-70,;3 pin;5.3 mm²-40°C to +85°CLead Free
MAX6326XR25-TNo Longer AvailableMAX6326XR25+TSC-70,;3 pin;5.3 mm²-40°C to +85°CNo
MAX6326XR26+ActiveSC-70,;3 pin;5.3 mm²-40°C to +85°CLead Free
MAX6326XR26+TActiveSC-70,;3 pin;5.3 mm²-40°C to +85°CLead Free
MAX6326XR26-TNo Longer AvailableMAX6326XR26+TSC-70,;3 pin;5.3 mm²-40°C to +85°CNo
MAX6326XR27+TActiveSC70;-40°C to +85°CSee data sheet
MAX6326XR27-TNo Longer AvailableMAX6326XR27+TSC-70,;3 pin;5.3 mm²-40°C to +85°CNo
MAX6326XR28+ActiveSC-70,;3 pin;5.3 mm²-40°C to +85°CLead Free
MAX6326XR28+TActiveSC-70,;3 pin;5.3 mm²-40°C to +85°CLead Free
MAX6326XR28-TNo Longer AvailableMAX6326XR28+TSC-70,;3 pin;5.3 mm²-40°C to +85°CNo
MAX6326-MAX6348.pdf MAX6348
HFAN-08.2.1: PWM Temperature Controller for Thermoelectric Modules Keeps Components within 0.1°C MAX4250
Maximize Battery Life and Minimize Replacements MAX6801
Switching Between Battery and External Power Sources MAX6801
Choosing Supervisor Outputs MAX6328
Micropower Circuit Offers Automatic Shutdown and Low-Battery Lockout MAX6346
MAX6326.pdf MAX6326
MAX6326-MAX6348.pdf MAX6348