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Analog Devices Inc./Maxim Integrated MAX824SEUK-T
- Part No.:
- MAX824SEUK-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX824SEUK-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,252
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Product details
Overview
MAX824SEUK-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 power supply monitoring for +2.93V systems. It guarantees RESET validity down to VCC = 1V, features 140ms min power-on reset, and operates across –40°C to +125°C. Used in automotive ECUs and industrial controllers for reliable brownout and startup supervision.
For engineers reviewing the MAX824SEUK-T datasheet, MAX824SEUK-T pinout, MAX824SEUK-T application, or MAX824SEUK-T equivalent, key selection criteria include reset threshold accuracy (2.93V ±15mV), watchdog immunity to WDI floating conditions, dual-reset polarity support, and SOT23-5 thermal performance up to +125°C.
Technical Context
The MAX824SEUK-T integrates a precision voltage comparator with 40ppm/°C temperature coefficient, 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 operates over VCC = +3.0V to +3.6V (matched to 2.93V threshold), delivers RESET output sinking capability of 1.2mA at VCC = VRST min, and maintains functional reset assertion during fast VCC transients due to built-in hysteresis (5mV) and transient immunity design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±15mV - precisely monitors +3.0V–+3.6V supplies with guaranteed trip point |
| Watchdog Timeout | 1.6s ±0.48s - provides robust software execution monitoring with edge-triggered clearing |
| Reset Timeout Period | 140–280ms - ensures sufficient µP initialization time after power-up or brownout recovery |
| Supply Current | 3µA typical (SOT23) - enables ultra-low-power operation in battery-backed systems |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial embedded environments |
| VCC Range | +3.0V to +3.6V - tightly matched to 2.93V threshold for stable margin and noise immunity |
| Reset Propagation Delay | 20µs max - ensures rapid response to VCC dip below threshold |
Pinout & Package
MAX824SEUK-T uses a 5-pin SOT23-5 package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm, rated for 571mW continuous dissipation at +70°C with 7.1mW/°C derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low reset output | Asserts low for ≥140ms on power-up/brownout; sinks 1.2mA at VCC = VRST min |
| 2 - GND | Ground reference | Common return path for all internal circuits and reset load current |
| 3 - WDI | Watchdog input | Edge-sensitive; clears 1.6s timer on rising/falling transition; disabled if floating |
| 4 - RESET | Active-high reset output | Complementary to pin 1; logic high when pin 1 is low - supports bidirectional µP reset pins |
| 5 - VCC | Supply input | Accepts +3.0V to +3.6V; internally regulated for precise threshold comparison |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity reset outputs | Simultaneous active-low and active-high signals eliminate need for external inverters in bidirectional µP interfaces |
| Watchdog with auto-disable | WDI left unconnected or three-stated disables watchdog via internal 1.4s servicing pulse - no risk of spurious resets |
| Guaranteed reset at 1V VCC | Ensures fail-safe behavior during deep brownouts where other supervisors lose functionality |
| No external components required | Internal MR pullup (52kΩ), precision voltage reference, and timing elements enable drop-in system integration |
| Transient-immune reset detection | Rejects negative VCC glitches ≤100ns at 100mV overdrive - prevents false resets in noisy power rails |
Applications
| Automotive Engine Control Unit | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply in engine ECU exposed to wide temperature swings and load dump transients. IC Role / Device Role / Timing Role: Supervisory circuit providing power-on reset, brownout detection, and watchdog supervision of main MCU firmware execution. Use Value: Dual RESET/RESET outputs interface directly with bidirectional reset pins on Renesas RH850 or Infineon AURIX MCUs; 125°C rating ensures reliability under hood. | Use Scenario: Embedded in modular I/O base unit requiring deterministic restart after power interruption or firmware hang. IC Role / Device Role / Timing Role: System-level supervisor generating synchronized reset pulses for ARM Cortex-M7 host and FPGA configuration logic. Use Value: 140ms reset timeout meets IEC 61000-4-11 immunity requirements; 3µA quiescent current extends backup battery life in uninterruptible operation. |
| Portable Medical Diagnostic Device | Railway Signaling Controller |
Use Scenario: Powers up and monitors low-voltage logic supply in handheld ultrasound processor with Li-ion battery input. IC Role / Device Role / Timing Role: Voltage supervisor ensuring safe boot sequence and runtime watchdog coverage for safety-critical DSP firmware. Use Value: 2.93V threshold matches nominal 3.0V LDO output; 1.6s watchdog timeout aligns with diagnostic loop timing without overspecifying margin. | Use Scenario: Installed in wayside signaling controller operating continuously in outdoor cabinets with wide ambient temperature variation. IC Role / Device Role / Timing Role: Critical reliability component asserting reset during AC mains dropout or DC rail sag in SIL-2 compliant systems. Use Value: Guaranteed RESET validity down to VCC = 1V prevents silent failure during extended brownouts; –40°C to +125°C range covers full EN 50121-3-2 environmental envelope. |
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 SOT23-5 package and temperature range, but 3.08V reset threshold (±15mV) | Suitable for +3.3V systems with tighter VCC margin; requires validation against 3.0V LDO tolerance stack-up | Select when system VCC nominal is 3.3V and minimum operating voltage exceeds 3.08V |
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms reset timeout, 2.5µA IQ, SOT23-5, but no active-high reset output or watchdog | Lacks watchdog and complementary reset - requires external inverter and separate watchdog IC for equivalent functionality | Choose only if watchdog and dual-reset are not required; lower IQ benefits ultra-low-power standby modes |
Compared with MAX824SEUK-T, MAX824TEUK-T offers higher reset threshold for improved noise margin in 3.3V rails, while TPS3808G33DBVR reduces quiescent current but sacrifices integrated watchdog and dual-reset capability - requiring additional components to match MAX824SEUK-T's feature set.
Availability
MAX824SEUK-T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, portable medical diagnostics, railway signaling controllers, and battery-powered embedded systems requiring stable component supply across extended temperature ranges.
Supply support for MAX824SEUK-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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX823/MAX824/MAX825 family was engineered specifically for high-reliability microprocessor supervision in harsh environments, integrating reset, watchdog, and manual reset functions into minimal 5-pin packages with guaranteed operation down to 1V VCC.
FAQ
What is the exact reset threshold voltage for MAX824SEUK-T and how is it specified over temperature?
The MAX824SEUK-T has a nominal reset threshold of 2.93V, with ±15mV initial accuracy at +25°C and a temperature coefficient of 40ppm/°C. Over the full –40°C to +125°C operating range, the threshold remains within 2.85V to 3.00V per the Electrical Characteristics table. This specification ensures stable trip-point behavior across automotive and industrial thermal profiles without requiring external calibration.
Does MAX824SEUK-T require external components to operate, and what is the role of the internal MR pullup resistor?
No, MAX824SEUK-T requires no external components for basic operation. It includes an internal 52kΩ pullup resistor on the MR (manual reset) input, allowing direct connection of a momentary switch to ground without external biasing. This resistor ensures MR defaults to logic high when unused, eliminating floating-input risks and simplifying PCB layout in space-constrained applications like portable medical devices.
How does the watchdog function behave if the WDI pin is left unconnected on MAX824SEUK-T?
When WDI is left unconnected on MAX824SEUK-T, the internal watchdog circuit is automatically disabled. The device generates a low-high-low pulse every 1.4s to service the timer, preventing timeout and reset assertion. This behavior is intentional and documented - no external pullup/down is needed, and the watchdog remains inert unless actively toggled by the host µP, avoiding unintended system resets during development or field use.
Can MAX824SEUK-T drive a bidirectional µP reset pin such as those found on Renesas or STMicrocontrollers?
Yes, MAX824SEUK-T can directly interface with bidirectional µP reset pins. Its RESET output sources up to 150µA (VOH ≥ 0.8×VCC) and sinks up to 1.2mA (VOL ≤ 0.3V at VCC = VRST min), matching the drive strength requirements of common bidirectional reset interfaces. The complementary RESET output further simplifies connection to µPs that require active-high assertion, eliminating level-shifting or inversion logic.
What is the minimum VCC voltage at which MAX824SEUK-T guarantees correct RESET output state, and why is this important?
MAX824SEUK-T guarantees correct RESET output state down to VCC = 1.0V - meaning it continues asserting reset even during severe brownout conditions where most supervisors cease functioning. This capability is critical in automotive and industrial systems where partial power collapse must trigger controlled shutdown rather than undefined µP behavior, ensuring deterministic system recovery and compliance with functional safety requirements.
MAX824SEUK-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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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
MAX824SEUK-T FAQ
1.How can I place an order for MAX824SEUK-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX824SEUK-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 MAX824SEUK-T reliable?
The price and inventory of MAX824SEUK-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX824SEUK-T is usually 5 days.
3.What payment methods are accepted for MAX824SEUK-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX824SEUK-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX824SEUK-T?
MAX824SEUK-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX824SEUK-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 MAX824SEUK-T?
For technical support, including MAX824SEUK-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX824SEUK-T requirements.
6.How does Aetrix verify that MAX824SEUK-T is sourced from the original manufacturer or authorized distributors?
All MAX824SEUK-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 MAX824SEUK-T meets industry standards.
7.What is the process for return or replacement of MAX824SEUK-T?
All MAX824SEUK-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX824SEUK-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 MAX824SEUK-T part is unused and in its original packaging.
Return procedure for MAX824SEUK-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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