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Analog Devices Inc./Maxim Integrated MAX822LUS+T
- Part No.:
- MAX822LUS+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX822LUS+T.pdf
- Description:
- IC MONITOR VOLT MPU SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,954
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Product details
Overview
MAX822LUS+T from Maxim Integrated is an active-high microprocessor supervisory circuit in a 4-pin SOT143 package, monitoring +4.63V supply voltage with ±1.5% threshold accuracy over -40°C to +125°C, 2.5µA quiescent current, and pin-selectable reset timeout (1ms max / 20ms min / 100ms min) for reliable power-on/brownout reset assertion in portable and industrial µP systems.
For engineers reviewing the MAX822LUS+T datasheet, MAX822LUS+T pinout, MAX822LUS+T application, or MAX822LUS+T equivalent, this page delivers verified electrical parameters, thermal performance data, SRT input configuration logic, reset timing behavior across temperature, and real-world transient immunity characteristics critical for embedded system reliability validation.
Technical Context
The MAX822LUS+T implements a precision bandgap-based voltage comparator with 30ppm/°C tempco to detect VCC falling below 4.63V (±1.5%), asserting an active-high RESET output guaranteed valid down to VCC = 1V. Its internal timer initiates only after VCC rises above threshold, with timeout duration strictly determined by SRT pin state (GND/VCC/open).
Reset assertion is immune to fast transients - a 12µs negative-going 100mV VCC glitch does not trigger false reset - and the device draws just 2.5µA at +25°C, scaling to ≤7µA across full -40°C to +125°C range, enabling battery-powered operation without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±1.5% - ensures reset asserts before downstream logic fails under +5V rail droop |
| Supply Current | 2.5µA typical at +25°C - enables multi-year battery life in always-on monitoring applications |
| Operating Temp | -40°C to +125°C - supports automotive under-hood and industrial control environments |
| Reset Timeout Options | 1ms (max), 20ms (min), or 100ms (min) - selectable via SRT pin connection for custom power-up sequencing |
| VCC Range | 1.0V to 5.5V - guarantees RESET validity during deep brownout recovery down to 1V |
| Reset Output Type | Active-high - directly interfaces with µP reset inputs requiring high-asserted initialization signal |
Pinout & Package
MAX822LUS+T uses a 4-pin SOT143 surface-mount package (1.3mm × 2.1mm × 0.95mm), optimized for space-constrained PCB layouts in portable instrumentation and embedded controllers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Low-impedance return path for internal comparator and output driver; must be connected to system ground plane |
| 2 RESET | Active-high reset output | Drives high during VCC undervoltage and remains high for selected timeout period after VCC recovery |
| 3 SRT | Set Reset Timeout input | Configures timeout: GND → 1ms, VCC → 20ms, open → 100ms; requires <200pF loading for stable 100ms mode |
| 4 VCC | Supply voltage input | Power source for internal circuitry; monitors itself for reset assertion; operates from 1.0V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable reset timeout | Three deterministic delay options (1ms/20ms/100ms) set by simple SRT connection - no firmware or external RC timing needed |
| +4.63V precision threshold | Guaranteed ±1.5% accuracy over full temperature range eliminates calibration overhead in 5V systems |
| Ultra-low 2.5µA supply current | Enables continuous supervision in coin-cell–powered devices without measurable battery drain impact |
| VCC transient immunity | Rejects 12µs, 100mV VCC glitches - prevents spurious resets during switching noise or ESD events |
| Valid RESET to VCC = 1V | Ensures controlled µP reset release even during severe brownout recovery, avoiding undefined logic states |
Applications
| Bar-Code Scanners | Portable Medical Devices |
|---|---|
Use Scenario: Handheld scanners powered by rechargeable Li-ion batteries experience rapid VCC sag during laser activation and RF transmission bursts. IC Role / Device Role / Timing Role: MAX822LUS+T continuously monitors the 5V rail and asserts active-high RESET if voltage drops below 4.63V, holding it for 20ms after recovery to ensure clean µP restart. Use Value: Prevents corrupted scan data and firmware lockups caused by brownout-induced instruction corruption during high-current pulses. | Use Scenario: Battery-powered glucose meters and pulse oximeters require guaranteed reset on cold-start and low-battery shutdown. IC Role / Device Role / Timing Role: MAX822LUS+T supervises the regulated 3.3V supply, asserting RESET when VCC falls below 4.63V (used with 5V LDO output), with 100ms timeout ensuring full capacitor discharge before safe shutdown. Use Value: Eliminates need for discrete reset IC + RC network, reducing BOM count while meeting IEC 60601-1 reliability requirements. |
| Industrial PLC I/O Modules | Automotive Body Control Units |
Use Scenario: DIN-rail mounted PLC modules endure wide ambient temperature swings (-40°C to +85°C) and noisy 24VDC supply rails. IC Role / Device Role / Timing Role: MAX822LUS+T provides temperature-stable reset supervision of the local 5V logic supply, using SRT tied to GND for fast 1ms reset release after power restoration. Use Value: Guarantees µP initialization within strict 10ms window required by Modbus RTU timing specifications. | Use Scenario: BCMs operate near engine compartments where supply voltage dips occur during cranking (6V–9V) and load-dump spikes. IC Role / Device Role / Timing Role: MAX822LUS+T monitors post-LDO 5V rail, asserting RESET during cranking-induced brownouts and holding for 100ms to prevent partial firmware execution. Use Value: Meets ISO 16750-2 pulse 4 (slow drop) and pulse 4a (fast drop) reset timing compliance without external hysteresis components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G15DBVR | Fixed 1.5V reset threshold; 350ms default timeout; requires external resistor for adjustment | Designed for ultra-low-voltage systems (<2V); lacks pin-selectable timeout flexibility | Choose only for sub-2V supply monitoring where 1.5V threshold is mandatory |
| ADM6705ARTZ-REEL7 | 4.63V threshold matches exactly; 200ms fixed timeout; no SRT pin; higher 8µA ICC | Targeted at cost-sensitive consumer electronics; no field-configurable timing | Select when board layout prohibits SRT routing and 200ms timeout suffices |
Compared with TPS3808G15DBVR and ADM6705ARTZ-REEL7, the MAX822LUS+T uniquely combines exact 4.63V threshold matching, three factory-trimmed timeout options via single-pin configuration, and industry-leading 2.5µA supply current - making it optimal for space-, power-, and timing-critical embedded designs requiring zero-compromise reset supervision.
Availability
MAX822LUS+T is available at Aetrix Electronics and suitable for bar-code scanners, portable medical devices, industrial PLC I/O modules, automotive body control units, and battery-powered instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX822LUS+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for industrial, automotive, communications, and computing markets, with emphasis on high-reliability, low-power, and integrated functionality.
The MAX822LUS+T belongs to Maxim's µP supervisory product line, engineered specifically for deterministic power-on reset generation in resource-constrained embedded systems where supply voltage stability, timing predictability, and minimal quiescent power are non-negotiable design requirements.
FAQ
What is the exact reset threshold voltage for MAX822LUS+T and how is it specified over temperature?
The MAX822LUS+T has a nominal reset threshold of 4.63V with ±1.5% tolerance over the full operating temperature range of -40°C to +125°C. This value is guaranteed by production testing, not just typical, and its temperature coefficient is 30ppm/°C - meaning threshold drift is bounded to ±0.014V across the entire range. The device maintains this accuracy without external calibration, making it suitable for mission-critical 5V system supervision where rail margin is tight.
How does the SRT pin configure the reset timeout delay on MAX822LUS+T?
The SRT pin on MAX822LUS+T selects one of three factory-trimmed timeout durations: connect SRT to GND for 1ms (maximum), to VCC for 20ms (minimum), or leave unconnected for 100ms (minimum). For stable 100ms operation, capacitive loading on SRT must remain below 200pF. Driving SRT with an external signal is possible but requires <500µs edge transition times to avoid unintended timeout selection - a design constraint explicitly documented in the MAX822LUS+T datasheet.
Is MAX822LUS+T compatible with 3.3V microprocessors despite its 4.63V threshold?
Yes, MAX822LUS+T is commonly used with 3.3V µPs when monitoring the upstream 5V supply feeding a 3.3V LDO regulator. Its 4.63V threshold ensures reset is asserted before the LDO output collapses - for example, if the 5V rail sags to 4.6V, the LDO may still deliver ~3.2V, but the MAX822LUS+T triggers reset early enough to prevent µP malfunction. This cascaded supervision strategy is validated in Maxim's application notes and widely deployed in industrial controllers using the MAX822LUS+T.
What is the minimum VCC voltage at which MAX822LUS+T guarantees valid RESET output?
The MAX822LUS+T guarantees valid active-high RESET output down to VCC = 1V. Below 1V, the output enters high-impedance state and is no longer driven. This specification is critical for brownout recovery: when VCC recovers from a deep dip (e.g., 0.8V), the MAX822LUS+T will assert RESET as soon as VCC crosses 1V and hold it for the configured timeout - ensuring the µP remains held in reset until sufficient supply stability is restored. This behavior is tested and guaranteed across temperature.
Does MAX822LUS+T provide immunity to VCC supply transients, and what is the documented limit?
Yes, MAX822LUS+T is designed to reject short-duration VCC transients. Per the datasheet, a negative-going glitch of 100mV magnitude (i.e., VCC dipping 100mV below the 4.63V threshold) lasting ≤12µs will not cause a false reset. This immunity is achieved through internal comparator hysteresis and filtering, and is characterized across temperature. For enhanced robustness in noisy environments, Maxim recommends placing a 0.1µF ceramic capacitor close to the VCC pin - a practice confirmed effective in MAX822LUS+T reference designs.
MAX822LUS+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX822LUS+T FAQ
1.How can I place an order for MAX822LUS+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX822LUS+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX822LUS+T reliable?
The price and inventory of MAX822LUS+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX822LUS+T is usually 5 days.
3.What payment methods are accepted for MAX822LUS+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX822LUS+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX822LUS+T?
MAX822LUS+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX822LUS+T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX822LUS+T?
For technical support, including MAX822LUS+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX822LUS+T requirements.
6.How does Aetrix verify that MAX822LUS+T is sourced from the original manufacturer or authorized distributors?
All MAX822LUS+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX822LUS+T meets industry standards.
7.What is the process for return or replacement of MAX822LUS+T?
All MAX822LUS+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX822LUS+T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX822LUS+T part is unused and in its original packaging.
Return procedure for MAX822LUS+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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