MAX821
MAX821
PRODUCTION4-Pin, µP Voltage Monitors with Pin-Selectable Power-On Reset Timeout Delay
4-Pin SOT Reset ICs with Selectable Reset Timeout Delay
- Part Models
- 16
- 1ku List Price
- Starting From $1.97
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Overview
- Pin-Selectable, Precision Power-On Reset Delay: 1ms (max), 20ms (min), or 100ms (min)
- Precision Monitoring of +3V to +5V Power-Supply Voltages
- 2.5µA Supply Current
- Guaranteed Over Temperature (-40°C to +125°C)
- Guaranteed Active-Low RESET Valid to VCC = 1V (MAX821)
- Power-Supply Transient Immunity
- No External Components
- SOT143 Package
The MAX821/MAX822 microprocessor (µP) supervisory circuits monitor power supplies in µP and digital systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with 5V-powered or 3V-powered circuits. The MAX821/MAX822 also provide a power-on reset timeout delay that is pin selectable to 1ms (max), 20ms (min), or 100ms (min).
These devices perform a single function: they assert a reset signal whenever the VCC supply voltage falls below a preset threshold, and they keep reset asserted for the pin-selected reset timeout delay after VCC has risen above the reset threshold. The only difference between the two devices is that the MAX821 has an active-low RESET output (which is guaranteed to be in the correct state for VCC down to 1V), while the MAX822 has an active-high RESET output. The reset comparator is designed to ignore fast transients on VCC. Reset thresholds suitable for operation with a variety of supply voltages are available.
Low supply current makes the MAX821/MAX822 ideal for use in portable equipment. These devices come in a 4-pin SOT143 package.
Applications
- Bar-Code Scanners
- Computers: Desktop, Workstation, Server
- Controllers
- Critical µP and µC Power Monitoring
- Intelligent Instruments
- Portable Battery-Powered Equipment
Documentation
Data Sheet 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX821LUS+ | SOT_23 | ||
| MAX821LUS+T | SOT_23 | ||
| MAX821LUS/GG8 | Small-Outline Transistor Package | ||
| MAX821MUS+ | SOT_23 | ||
| MAX821MUS+T | SOT_23 | ||
| MAX821PUS+ | SOT_23 | ||
| MAX821PUS+T | SOT_23 | ||
| MAX821RUS+ | SOT_23 | ||
| MAX821RUS+T | SOT_23 | ||
| MAX821SUS+ | SOT_23 | ||
| MAX821SUS+T | SOT_23 | ||
| MAX821TUS+ | SOT_23 | ||
| MAX821TUS+T | SOT_23 | ||
| MAX821TUS/GG8 | Small-Outline Transistor Package | ||
| MAX821UUS+ | SOT_23 | ||
| MAX821UUS+T | SOT_23 |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 27, 2023 - 2361N1 WAFER FAB |
||
| MAX821LUS+ | PRODUCTION | |
| MAX821LUS+T | PRODUCTION | |
| MAX821PUS+ | PRODUCTION | |
| MAX821PUS+T | PRODUCTION | |
| MAX821SUS+ | PRODUCTION | |
| MAX821SUS+T | PRODUCTION | |
| MAX821UUS+ | PRODUCTION | |
| MAX821UUS+T | PRODUCTION | |
|
Feb 4, 2015 - 1341_CANCELLATION ASSEMBLY |
||
| MAX821LUS+ | PRODUCTION | |
| MAX821LUS+T | PRODUCTION | |
| MAX821MUS+ | PRODUCTION | |
| MAX821MUS+T | PRODUCTION | |
| MAX821PUS+ | PRODUCTION | |
| MAX821PUS+T | PRODUCTION | |
| MAX821RUS+ | PRODUCTION | |
| MAX821RUS+T | PRODUCTION | |
| MAX821SUS+ | PRODUCTION | |
| MAX821SUS+T | PRODUCTION | |
| MAX821TUS+ | PRODUCTION | |
| MAX821TUS+T | PRODUCTION | |
| MAX821UUS+ | PRODUCTION | |
| MAX821UUS+T | PRODUCTION | |
|
Apr 20, 2026 - 2571C PIN/ERRATA |
||
| MAX821LUS+T | PRODUCTION | |
| MAX821MUS+ | PRODUCTION | |
| MAX821MUS+T | PRODUCTION | |
| MAX821PUS+T | PRODUCTION | |
| MAX821RUS+T | PRODUCTION | |
| MAX821SUS+ | PRODUCTION | |
| MAX821SUS+T | PRODUCTION | |
| MAX821TUS+ | PRODUCTION | |
| MAX821TUS+T | PRODUCTION | |
| MAX821UUS+T | PRODUCTION | |
|
Jul 3, 2023 - 2361NA WAFER FAB |
||
| MAX821MUS+ | PRODUCTION | |
| MAX821MUS+T | PRODUCTION | |
| MAX821RUS+ | PRODUCTION | |
| MAX821RUS+T | PRODUCTION | |
| MAX821TUS+ | PRODUCTION | |
| MAX821TUS+T | PRODUCTION | |
| MAX821TUS/GG8 | PRODUCTION | |
|
Jun 29, 2018 - 1703N ASSEMBLY |
||
| MAX821PUS+T | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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| Parts | Product Life Cycle | Description |
|---|---|---|
| Supervisory Circuits & Reset ICs 8 | ||
| MAX6314 | PRODUCTION | 68HC11/Bidirectional-Compatible µP Reset Circuit |
| MAX6315 | PRODUCTION | Open-Drain SOT µP Reset Circuit |
| MAX6332 | Obsolete | 3-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits |
| MAX6333 | PRODUCTION | 3-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits |
| MAX6334 | PRODUCTION | 3-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits |
| MAX6335 | PRODUCTION | 4-Pin, Ultra Low-Voltage, Low-Power µP Reset Circuits with Manual Reset |
| MAX6336 | PRODUCTION | 4-Pin, Ultra Low-Voltage, Low-Power µP Reset Circuits with Manual Reset |
| MAX6337 | PRODUCTION | 4-Pin, Ultra Low-Voltage, Low-Power µP Reset Circuits with Manual Reset |
Tools & Simulations
IBIS Model 1
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