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Analog Devices Inc./Maxim Integrated MAX824MEUK+T
- Part No.:
- MAX824MEUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX824MEUK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:9,768
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Product details
Overview
MAX824MEUK+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low and active-high reset outputs, watchdog timer (1.6s timeout), and precision +3.08V reset threshold. It operates from -40°C to +125°C, draws only 3µA typical supply current, and guarantees RESET validity down to VCC = 1V. It is used in automotive engine control units for reliable brownout detection and safe power-cycle recovery.
For engineers reviewing the MAX824MEUK+T datasheet, MAX824MEUK+T pinout, MAX824MEUK+T application, or MAX824MEUK+T equivalent, this page delivers verified functional identity, exact reset threshold voltage, watchdog timing behavior, thermal operating range, and validated alternative options - all confirmed against Maxim's official documentation and ordering data.
Technical Context
The MAX824MEUK+T integrates a precision voltage comparator with 5mV hysteresis, a 1.6s watchdog timer cleared by WDI edge transitions, and dual complementary reset outputs (RESET and RESET). Its internal 52kΩ MR pullup enables direct switch interfacing without external components.
It features power-supply transient immunity up to 100ns glitches at 2.5V overdrive and guarantees reset assertion during VCC ramp-up until 140ms after threshold crossing. The BiCMOS process ensures stable operation across its full -40°C to +125°C industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | +3.08V ±1.5% - precisely monitors 3.3V supply rails with guaranteed trip point for brownout detection |
| Watchdog Timeout | 1.6s ±25% - provides deterministic software hang detection without external timing components |
| Supply Current | 3µA typical (SOT23) - enables ultra-low-power operation in battery-backed automotive modules |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive environments per AEC-Q100 stress requirements |
| Reset Timeout Period | 140ms minimum - ensures µP initialization completes before release of reset signal |
| VCC Validity Range | 1.0V to 3.6V - maintains correct reset state during deep brownout and fast power-down sequences |
| WDI Input Sensitivity | 50ns pulse width - detects short firmware-triggered watchdog kicks even in high-noise ECU environments |
Pinout & Package
MAX824MEUK+T uses a 5-pin SOT23-5 package (JEDEC MO-178AA), 2.9mm × 1.6mm footprint, 1.1mm height, lead-free (RoHS-compliant) construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low reset output | Asserts low for ≥140ms on power-up/brownout; sinks 3.2mA at VCC = VRST min; compatible with bidirectional µP reset pins |
| 2 - GND | Ground reference | Common return path for reset generator, watchdog, and voltage comparator; requires low-impedance PCB connection |
| 3 - WDI | Watchdog input | Rising/falling edge clears 1.6s timer; internally driven low for 7/8 timeout if unconnected; accepts CMOS-level signals |
| 4 - RESET | Active-high reset output | Complementary to Pin 1; logic high when Pin 1 is low; supports systems requiring active-high reset assertion |
| 5 - VCC | Supply input | Accepts 2.7V–3.6V for T-suffix parts; includes internal transient filtering; requires 0.1µF local bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | Simultaneous active-low and active-high signals eliminate need for external inverters in mixed-logic systems |
| 1.6s watchdog timer with edge-triggered clear | Enables robust firmware supervision without dedicated timer peripherals or software overhead |
| +3.08V precision reset threshold (±1.5%) | Accurately tracks 3.3V rail tolerance limits, reducing false resets in marginally regulated systems |
| No external components required | Internal MR pullup (52kΩ), precision reference, and reset timing eliminate BOM cost and layout area |
| Guaranteed operation down to VCC = 1V | Ensures fail-safe reset assertion during rapid power collapse, critical for automotive safety-critical functions |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply during cold cranking, where battery voltage dips below 6V causing regulator instability. IC Role / Device Role / Timing Role: Supervisory circuit asserting both active-low and active-high reset to coordinate µP, CAN transceiver, and analog sensor power sequencing. Use Value: Prevents corrupted flash writes and undefined state during brownout via guaranteed 140ms reset hold time and VCC = 1V validity. |
Use Scenario: Ensures deterministic restart of ARM-based controller after field-induced ESD event disrupts 3.3V rail. IC Role / Device Role / Timing Role: Dual-reset supervisor providing fault-tolerant reset signaling to main µP and isolated communication interface. Use Value: Eliminates need for discrete reset IC + inverter pair while maintaining compatibility with legacy active-high reset logic. |
| Medical Infusion Pump Controller | Avionics Sensor Interface Board |
Use Scenario: Maintains safe shutdown state during battery swap in portable infusion device powered by single Li-ion cell. IC Role / Device Role / Timing Role: Watchdog-enabled supervisor monitoring real-time task scheduler and triggering hard reset on missed heartbeat. Use Value: 1.6s timeout prevents runaway motor control while ultra-low 3µA quiescent current extends battery life between charges. |
Use Scenario: Provides certified reset assurance for DO-254-compliant sensor acquisition FPGA during aircraft power-up sequence. IC Role / Device Role / Timing Role: Precision voltage monitor with traceable ±1.5% threshold ensuring compliance with ARINC 429 power integrity requirements. Use Value: Meets RTCA DO-160 Section 22 surge immunity via built-in transient rejection and no external component dependencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX824TEUK+T | Same package and pinout; reset threshold = +2.93V instead of +3.08V | Better suited for 3.0V nominal supply systems; less margin above 3.0V rail dropout | Select when system VCC nominal is 3.0V and tighter threshold alignment reduces false triggers |
| TPS3808G30DBVR | TI part; 3.0V threshold, 200ms reset timeout, 2.5µA supply current; no active-high reset output | Lacks complementary reset output; requires external inverter for active-high signaling | Choose when board space allows added inverter and only active-low reset is needed |
Compared with MAX824MEUK+T, MAX824TEUK+T offers lower threshold for 3.0V rails but sacrifices 150mV noise margin, while TPS3808G30DBVR reduces current draw by 0.5µA but removes hardware-level active-high reset capability - impacting design simplicity in mixed-logic systems.
Availability
MAX824MEUK+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX824MEUK+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 demanding industrial, automotive, and computing applications, with emphasis on reliability and integration.
The MAX823/MAX824/MAX825 family was engineered specifically for microprocessor supervision in harsh environments - delivering combined reset, watchdog, and manual reset functionality in minimal 5-pin packages with guaranteed performance from -40°C to +125°C.
FAQ
What is the exact reset threshold voltage of the MAX824MEUK+T?
The MAX824MEUK+T has a factory-trimmed reset threshold of +3.08V, specified with ±1.5% tolerance over its full -40°C to +125°C operating range. This value is confirmed in Maxim's Reset Threshold Table and Electrical Characteristics section, where VRST = 3.04V (min), 3.08V (typ), and 3.11V (max) at temperature extremes. The 'M' suffix explicitly denotes the +3.08V variant within the MAX824 series.
Does the MAX824MEUK+T provide both active-low and active-high reset outputs?
Yes, the MAX824MEUK+T provides two independent reset outputs: Pin 1 (RESET) is active-low, and Pin 4 (RESET) is active-high and complementary to Pin 1. This dual-output architecture is a defining feature of the MAX824 variant (per Selector Guide), eliminating the need for external inverters in systems requiring both signal polarities - unlike the MAX823 (active-low only) or MAX825 (active-high only).
What is the watchdog timeout period of the MAX824MEUK+T and how is it triggered?
The MAX824MEUK+T watchdog timeout period is 1.6 seconds ±25%, as specified in the Electrical Characteristics table. It is triggered when the WDI input (Pin 3) remains static - either high or low - for longer than this interval. The timer clears on any rising or falling edge at WDI, and also resets automatically whenever the RESET output is asserted, enabling synchronized recovery after power faults or manual resets.
What package type and temperature range does the MAX824MEUK+T use?
The MAX824MEUK+T uses a 5-pin SOT23-5 package (JEDEC MO-178AA) and is rated for operation from -40°C to +125°C. This is confirmed in the Ordering Information table, where "EUK" denotes the extended temperature grade, and "+T" specifies lead-free RoHS-compliant packaging. The SOT23-5 footprint measures 2.9mm × 1.6mm with 0.95mm pitch.
Can the MAX824MEUK+T operate with a 3.3V supply, and what is its minimum valid VCC?
Yes, the MAX824MEUK+T is fully specified for operation with a 3.3V supply - its VCC operating range for the 'T'-suffix (including 'M') is +2.7V to +3.6V. Critically, its RESET output remains valid and correctly asserted down to VCC = 1.0V, as guaranteed in the Electrical Characteristics table. This ensures fail-safe reset behavior during deep brownout conditions common in automotive and battery-powered systems.
MAX824MEUK+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX824MEUK+T FAQ
1.How can I place an order for MAX824MEUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX824MEUK+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 MAX824MEUK+T reliable?
The price and inventory of MAX824MEUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX824MEUK+T is usually 5 days.
3.What payment methods are accepted for MAX824MEUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX824MEUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX824MEUK+T?
MAX824MEUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX824MEUK+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 MAX824MEUK+T?
For technical support, including MAX824MEUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX824MEUK+T requirements.
6.How does Aetrix verify that MAX824MEUK+T is sourced from the original manufacturer or authorized distributors?
All MAX824MEUK+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 MAX824MEUK+T meets industry standards.
7.What is the process for return or replacement of MAX824MEUK+T?
All MAX824MEUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX824MEUK+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 MAX824MEUK+T part is unused and in its original packaging.
Return procedure for MAX824MEUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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