MAX6821：Low-Voltage SOT23 µP Supervisors with Manual Reset and Watchdog Timer
The MAX6821—MAX6825 are low-voltage microprocessor (µP) supervisory circuits that combine voltage monitoring, watchdog timer, and manual reset input functions in a 5-pin SOT23 package. Microprocessor supervisory circuits significantly improve system reliability and accuracy compared to separate ICs or discrete components. These devices assert a reset signal whenever the monitored voltage drops below its preset threshold, keeping it asserted for a minimum timeout period after VCC rises above the threshold. In addition, a watchdog timer monitors against code execution errors. A debounced manual reset is also available. The MAX6821—MAX6825 monitor voltages from +1.8V to +5.0V. These outputs are guaranteed to be in the correct state for VCC down to +1.0V. Nine preprogrammed reset threshold voltages are available (see the Threshold Suffix Guide). The MAX6821, MAX6822, and MAX6823 all have a manual reset input and a watchdog timer. The MAX6821 has push-pull RESET, the MAX6822 has open-drain active-low RESET, and the MAX6823 has push-pull active-low RESET. The MAX6824 has a watchdog timer and both push-pull active-low RESET and push-pull RESET. The MAX6825 has a manual reset input and both push-pull active-low RESET and push-pull RESET. The Selector Guide explains the functions offered in this series of parts.
Key Features
| MAX6821, MAX6822, MAX6823, MAX6824, MAX6825: Typical Operating Circuit Applications/Uses
|
DataSheet
| title | Download file |
|---|---|
| MAX6821-MAX6825 Data Sheet | MAX6821-MAX6825.pdf |
Parametrics
| Part Number | Reset Thresh. (V) | Reset Out | tRESET | Watchdog Feature | Watchdog Timeout | Supervisor Features | Reset Thresh. Accur. (%) | ICC (µA) | Package/Pins | Budgetary Price |
|---|---|---|---|---|---|---|---|---|---|---|
| min | @ +25°C | max | See Notes | |||||||
| MAX6821 | 1.2 to 1.8 1.8 to 2.5 2.5 to 3.3 3.3 to 5.5 | Active High Push-Pull | 85ms to 300ms | Input (WDI) | 1s to 2s | Manual Reset | 2.5 | 16 | SOT/5 | $1.55 @1k |
| MAX6822 | Active Low Open Drain | Input (WDI) | 1s to 2s | Manual Reset | 16 | SOT/5 | $1.55 @1k | |||
| MAX6823 | Active Low Push-Pull | Input (WDI) | 1s to 2s | Manual Reset | 16 | SOT/5 | $1.77 @1k | |||
| MAX6824 | Active High Active Low Push-Pull | Input (WDI) | 1s to 2s | - | 16 | SOT/5 | $1.77 @1k | |||
| MAX6825 | Active High Active Low Push-Pull | No Watchdog | - | Manual Reset | 12 | SOT/5 | $1.55 @1k | |||
Quality and Environmental Data
Ordering Information
| Part Number | Status | Recommended Replacement | Package | Temp | RoHS |
|---|---|---|---|---|---|
| MAX6821LUK-T | No Longer Available | SOT,;5 pin;9 mm² | -40°C to +125°C | No | |
| MAX6821MUK-T | No Longer Available | SOT,;5 pin;9 mm² | -40°C to +125°C | No | |
| MAX6821RUK+ | Active | SOT,;5 pin;9 mm² | -40°C to +125°C | Lead Free | |
| MAX6821RUK+T | Active | SOT,;5 pin;9 mm² | -40°C to +125°C | Lead Free | |
| MAX6821RUK-T | No Longer Available | MAX6821RUK+T | SOT,;5 pin;9 mm² | -40°C to +125°C | No |
| MAX6821SUK+ | Active | SOT,;5 pin;9 mm² | -40°C to +125°C | Lead Free | |
| MAX6821SUK+T | Active | SOT,;5 pin;9 mm² | -40°C to +125°C | Lead Free | |
| MAX6821SUK-T | No Longer Available | MAX6821SUK+T | SOT,;5 pin;9 mm² | -40°C to +125°C | No |
| MAX6821TUK-T | No Longer Available | SOT,;5 pin;9 mm² | -40°C to +125°C | No | |
| MAX6821VUK-T | No Longer Available | SOT,;5 pin;9 mm² | -40°C to +125°C | No | |
| Part Number | Status | Recommended Replacement | Package | Temp | RoHS |
| MAX6821WUK-T | No Longer Available | SOT,;5 pin;9 mm² | -40°C to +125°C | No | |
| MAX6821YUK-T | No Longer Available | SOT,;5 pin;9 mm² | -40°C to +125°C | No | |
| MAX6821ZUK-T | No Longer Available | SOT,;5 pin;9 mm² | -40°C to +125°C | No |
- MAX6821-MAX6825.pdf MAX6825
- MAX6821.pdf MAX6821
- 典型工作电路 MAX6825
