MAX6421:Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay

The MAX6340/MAX6421–MAX6426 low-power microprocessor supervisor circuits monitor system voltages from 1.6V to 5V. These devices perform a single function: they assert a reset signal whenever the VCC supply voltage falls below its reset threshold. The reset output remains asserted for the reset timeout period after VCC rises above the reset threshold. The reset timeout is externally set by a capacitor to provide more flexibility. The MAX6421/MAX6424 have an active-low, push-pull reset output. The MAX6422 has an active-high, push-pull reset output and the MAX6340/MAX6423/MAX6425/MAX6426 have an active-low, open-drain reset output. The MAX6421/MAX6422/MAX6423 are offered in 4-pin SC70 or SOT143 packages. The MAX6340/MAX6424/MAX6425/MAX6426 are available in 5-pin SOT23-5 packages.

Key Features
  • Monitor System Voltages from 1.6V to 5V
  • Capacitor-Adjustable Reset Timeout Period
  • Low Quiescent Current (1.6µA typ)
  • Three RESET Output Options
    • Push-Pull Active-Low RESET
    • Push-Pull RESET
    • Open-Drain Active-Low RESET
  • Guaranteed Reset Valid to VCC = 1V
  • Immune to Short VCC Transients
  • Small 4-Pin SC70, 4-Pin SOT143, and 5-Pin SOT23 Packages
  • MAX6340 Pin Compatible with LP3470
  • MAX6424/MAX6425 Pin Compatible with NCP300–NCP303, MC33464/MC33465, S807/S808/S809, and RN5VD
  • MAX6426 Pin Compatible with PST92XX
MAX6340, MAX6421, MAX6422, MAX6423, MAX6424, MAX6425, MAX6426: Typical Operating Circuit
MAX6340, MAX6421, MAX6422, MAX6423, MAX6424, MAX6425, MAX6426: Typical Operating Circuit
Applications/Uses
  • Automotive
  • Battery-Powered Computers/Controllers
  • Computers
  • Critical µP Monitoring
  • Embedded Controllers
  • Intelligent Instruments
  • Medical Equipment
  • Portable Equipment
  • Set-Top Boxes
DataSheet
titleDownload file
MAX6340-MAX6426 Data SheetMAX6340-MAX6426.pdf
Parametrics
Part NumberReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
MAX63401.2 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
<1ms
>1s
Adjustable
No Watchdog1.52.5SOT/5$1.30 @1k
MAX6421Active Low
Push-Pull
SC-70/4
SOT/4
MAX6422Active High
Push-Pull
SC-70/4
SOT/4
MAX6423Active Low
Open Drain
SC-70/4
SOT/4
MAX6424Active Low
Push-Pull
SOT/5
MAX6425Active Low
Open Drain
SOT/5
MAX6426Active Low
Open Drain
SOT/5
Quality and Environmental Data
Related Products
  • MAX6420:Low-Power, Single/Dual-Voltage µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay
  • MAX6412:Low-Power, Single/Dual-Voltage µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay
  • MAX6381:SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset Circuits
  • MAX6303:+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
  • MAX6304:+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
  • MAX6301:+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
  • MAX6302:+5V, Low-Power, µP Supervisory Circuits with Adjustable Reset/Watchdog
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6421US16+TActiveSOT,;4 pin;8 mm²-40°C to +125°CLead Free
MAX6421US16-TNo Longer AvailableMAX6421US16+TSOT,;4 pin;8 mm²-40°C to +125°CNo
MAX6421US17+TActiveSOT,;4 pin;8 mm²-40°C to +125°CLead Free
MAX6421US17-TActiveSOT,;4 pin;8 mm²-40°C to +125°CNo
MAX6421US18+TActiveSOT;-40°C to +125°CSee data sheet
MAX6421US18-TActiveSOT,;4 pin;8 mm²-40°C to +125°CNo
MAX6421US19+TActiveSOT;-40°C to +125°CSee data sheet
MAX6421US19-TActiveSOT,;4 pin;8 mm²-40°C to +125°CNo
MAX6421US20+TActiveSOT;-40°C to +125°CSee data sheet
MAX6421US20-TActiveSOT,;4 pin;8 mm²-40°C to +125°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6421US21+TActiveSOT;-40°C to +125°CSee data sheet
MAX6421US21-TActiveSOT,;4 pin;8 mm²-40°C to +125°CNo
MAX6421US22+TActiveSOT,;4 pin;8 mm²-40°C to +125°CLead Free
MAX6421US22-TNo Longer AvailableMAX6421US22+TSOT,;4 pin;8 mm²-40°C to +125°CNo
MAX6421US23+TActiveSOT,;4 pin;8 mm²-40°C to +125°CLead Free
MAX6421US23-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +125°CNo
MAX6421US24+TActiveSOT;-40°C to +125°CSee data sheet
MAX6421US24-TActiveSOT,;4 pin;8 mm²-40°C to +125°CNo
MAX6421US25+TActiveSOT;-40°C to +125°CSee data sheet
MAX6421US25-TActiveSOT,;4 pin;8 mm²-40°C to +125°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6421US26+ActiveSOT,;4 pin;8 mm²-40°C to +125°CLead Free
MAX6421US26+TActiveSOT,;4 pin;8 mm²-40°C to +125°CLead Free
MAX6421US26-TNo Longer AvailableMAX6421US26+TSOT,;4 pin;8 mm²-40°C to +125°CNo
MAX6421US27+TActiveSOT;-40°C to +125°CSee data sheet
MAX6421US27-TActiveSOT,;4 pin;8 mm²-40°C to +125°CNo
MAX6421US28+TActiveSOT;-40°C to +125°CSee data sheet
MAX6421US28-TNo Longer AvailableSOT,;4 pin;8 mm²-40°C to +125°CNo
MAX6421US29No Longer AvailableMAX6421US29+SOT,;4 pin;8 mm²-40°C to +125°CNo
MAX6421US29+ActiveSOT,;4 pin;8 mm²-40°C to +125°CLead Free
MAX6421US29+TActiveSOT,;4 pin;8 mm²-40°C to +125°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6421US29-TNo Longer AvailableMAX6421US29+TSOT,;4 pin;8 mm²-40°C to +125°CNo
MAX6421US30+TActiveSOT;-40°C to +125°CSee data sheet
MAX6421US30-TActiveSOT,;4 pin;8 mm²-40°C to +125°CNo
MAX6421US31+TActiveSOT,;4 pin;8 mm²-40°C to +125°CLead Free
MAX6421US31-TNo Longer AvailableMAX6421US31+TSOT,;4 pin;8 mm²-40°C to +125°CNo
MAX6421US32+TActiveSOT;-40°C to +125°CSee data sheet
MAX6421US32-TActiveSOT,;4 pin;8 mm²-40°C to +125°CNo
MAX6421US33+TActiveSOT;-40°C to +125°CSee data sheet
MAX6421US33-TActiveSOT,;4 pin;8 mm²-40°C to +125°CNo
MAX6421US34+TActiveSOT;-40°C to +125°CSee data sheet
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6421US34-TActiveSOT,;4 pin;8 mm²-40°C to +125°CNo
MAX6421US35+TActiveSOT;-40°C to +125°CSee data sheet
MAX6421US35-TActiveSOT,;4 pin;8 mm²-40°C to +125°CNo
MAX6421US36+TActiveSOT;-40°C to +125°CSee data sheet
MAX6421US36-TActiveSOT,;4 pin;8 mm²-40°C to +125°CNo
MAX6421US37+TActiveSOT;-40°C to +125°CSee data sheet
MAX6421US37-TActiveSOT,;4 pin;8 mm²-40°C to +125°CNo
MAX6421US38+TActiveSOT;-40°C to +125°CSee data sheet
MAX6421US38-TActiveSOT,;4 pin;8 mm²-40°C to +125°CNo
MAX6421US39+TActiveSOT;-40°C to +125°CSee data sheet
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