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Analog Devices Inc./Maxim Integrated MAX824REUK+T
- Part No.:
- MAX824REUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX824REUK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,794
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Product details
Overview
MAX824REUK+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 +2.63V reset threshold. It operates from -40°C to +125°C, draws 3–8µA supply current, guarantees RESET validity down to VCC = 1V, and is used in automotive systems and critical µP monitoring where transient immunity and dual-reset polarity are required.
For engineers reviewing the MAX824REUK+T datasheet, MAX824REUK+T pinout, MAX824REUK+T application, or MAX824REUK+T equivalent, key selection criteria include its dual-reset output polarity, 2.63V threshold accuracy over temperature, watchdog enable/disable behavior via WDI connection, and SOT23-5 package compatibility with high-temperature industrial designs.
Technical Context
The MAX824REUK+T integrates a precision voltage comparator with 40ppm/°C temperature coefficient, a 1.6s watchdog timer cleared by WDI edge transitions or RESET assertion, and independent active-low (RESET) and active-high (RESET) outputs. Its reset timeout is fixed at 140–280ms, and it features internal MR pullup (52kΩ) and power-supply transient immunity validated for negative-going VCC glitches.
Unlike the MAX823/MAX825 variants, the MAX824REUK+T excludes manual reset input but includes complementary reset outputs - enabling direct interface to µPs requiring either polarity without external inverters. The device's BiCMOS process ensures stable operation across its full -40°C to +125°C range with no external components required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | +2.63V (±0.03V over temp), precisely monitors 2.7V supply rails during brownout |
| Watchdog Timeout | 1.6s nominal, detects µP lockup when WDI fails to toggle within this window |
| Reset Timeout Period | 140–280ms, holds µP in reset long enough for power stabilization post-brownout |
| Supply Current | 3–8µA (SOT23), enables ultra-low-power battery-backed applications |
| Operating Temp Range | -40°C to +125°C, qualified for under-hood automotive and industrial control environments |
| VCC Validity | RESET guaranteed functional down to VCC = 1V, supports deep brownout detection |
| Reset Hysteresis | 5mV (for R/T/S/Z/Y suffixes), prevents chatter near threshold during slow VCC recovery |
Pinout & Package
Package: SOT23-5 (lead-free, +125°C rated). Pinout verified per Maxim's official pin configuration diagram and functional description for MAX824 series.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low reset output | Drives µP reset pin low during power-up, brownout, or watchdog timeout; sinks 3.2mA min |
| 2 - GND | Ground reference | Common return path for all internal circuits; must be low-impedance for noise immunity |
| 3 - WDI | Watchdog input | Edge-sensitive input; toggling clears 1.6s timer; unconnected disables watchdog |
| 4 - RESET | Active-high reset output | Inverse of pin 1; directly drives logic-high reset inputs without external inverter |
| 5 - VCC | Supply voltage input | Accepts 2.7V–3.6V (R-suffix); internal regulator enables operation down to 1V VCC |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity reset outputs | Simultaneous active-low and active-high RESET signals eliminate need for external level-shifting or inversion |
| Watchdog with auto-disable | WDI left floating or three-stated internally services timer every 1.4s, disabling watchdog without firmware changes |
| 2.63V precision threshold | Matches common 2.7V supply rails; ±0.03V tolerance ensures reliable brownout detection across temperature |
| 1V VCC operation guarantee | RESET remains asserted and valid even during severe undervoltage, preventing premature µP release |
| Transient-immune design | Ignores fast negative-going VCC glitches up to 100ns duration at 200mV overdrive, reducing false resets |
Applications
| Automotive Engine Control Units | Industrial PLC Controllers |
|---|---|
Use Scenario: Monitoring 2.7V microcontroller supply in engine control modules exposed to wide thermal cycling and load dump transients. IC Role / Device Role / Timing Role: Dual-reset supervisor providing fail-safe µP reset initiation and watchdog-based software hang detection. Use Value: Active-high RESET directly interfaces with ASIL-B-compliant MCU reset pins; 125°C rating ensures reliability under hood. | Use Scenario: Ensuring deterministic startup and runtime supervision of ARM-based PLC CPUs in factory automation cabinets. IC Role / Device Role / Timing Role: Voltage monitor and watchdog timer enforcing system-level fault containment during firmware execution. Use Value: 140ms minimum reset pulse meets IEC 61131-2 timing requirements for programmable logic controllers. |
| Battery-Powered Medical Devices | Railway Signaling Systems |
Use Scenario: Supervising low-power Cortex-M0+ in portable ECG monitors powered by single-cell Li-ion (2.7–4.2V). IC Role / Device Role / Timing Role: Precision 2.63V threshold detector and watchdog enforcer for safety-critical firmware execution. Use Value: 3µA typical supply current extends battery life; dual-reset outputs simplify interface to mixed-voltage logic domains. | Use Scenario: Providing certified reset supervision for SIL-2-rated signaling processors operating in rail-side cabinets (-40°C to +70°C ambient). IC Role / Device Role / Timing Role: High-reliability µP supervisor with guaranteed 1V VCC operation and transient-hardened reset generation. Use Value: Meets EN 50129 clause 7.3.2 for reset integrity under brownout; lead-free +125°C package supports extended lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX824SEUK+T | 2.93V reset threshold (vs. 2.63V); identical pinout, package, and feature set | Targets 3.0V supply rails instead of 2.7V; same automotive/industrial use cases | Select when monitoring 3.0V systems; no layout or firmware changes needed |
| TLV809E26DBVR | Single active-low reset only; no watchdog or active-high output; 2.63V threshold; SOT23-5 package | Lacks watchdog and complementary reset; suitable only for basic reset-only applications | Choose only if watchdog and dual-reset are unnecessary; lower cost but reduced functionality |
Compared with MAX824REUK+T, the MAX824SEUK+T offers identical supervision architecture with higher threshold for 3.0V rails, while TLV809E26DBVR provides minimal reset-only functionality at lower complexity - neither is pin-compatible for watchdog or dual-reset use, making MAX824REUK+T irreplaceable where those features are required.
Availability
MAX824REUK+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC controllers, and battery-powered medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX824REUK+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.
The MAX824REUK+T belongs to the MAX823/MAX824/MAX825 supervisory family, engineered specifically for high-reliability µP monitoring in environments with voltage transients, wide temperature swings, and safety-critical reset timing requirements.
FAQ
What is the reset threshold voltage of the MAX824REUK+T and how is it specified over temperature?
The MAX824REUK+T has a nominal reset threshold of +2.63V, with ±0.03V tolerance over its full -40°C to +125°C operating range. This value is guaranteed across temperature with a 40ppm/°C coefficient, ensuring stable brownout detection for 2.7V supply rails without calibration. The MAX824REUK+T datasheet specifies VRST = 2.59V (min) to 2.66V (max) at TMIN to TMAX, and 2.63V (typ) at +25°C.
Does the MAX824REUK+T include a manual reset input (MR) pin?
No, the MAX824REUK+T does not include a manual reset input. Per Maxim's Selector Guide and Pin Description, MR is present only on MAX823 and MAX825 variants. The MAX824REUK+T provides watchdog input (WDI) and complementary reset outputs (RESET and RESET) but omits MR - confirming its role as a watchdog-enabled dual-reset supervisor without user-initiated reset capability.
How does the watchdog function behave when the WDI pin is left unconnected on the MAX824REUK+T?
When WDI is left unconnected on the MAX824REUK+T, the internal watchdog timer is automatically serviced every ~1.4 seconds by an internal low-high-low pulse, effectively disabling the watchdog function. This behavior is documented in the "Detailed Description" and "Applications Information" sections, allowing safe deployment without firmware intervention. No external pullup/down is required, and the MAX824REUK+T operates as a pure voltage supervisor in this configuration.
What is the maximum supply voltage range supported by the MAX824REUK+T?
The MAX824REUK+T supports VCC from +2.7V to +3.6V, as defined for the "R" suffix in the Reset Threshold Table and Electrical Characteristics. This range is strictly enforced to ensure accurate 2.63V threshold monitoring - applying voltages outside this window (e.g., 5V) violates absolute maximum ratings and risks incorrect reset assertion or device damage. The MAX824REUK+T is not rated for 5V operation like L/M-suffix variants.
Can the MAX824REUK+T drive a microcontroller with a bidirectional reset pin?
Yes, the MAX824REUK+T can interface with µPs having bidirectional reset pins such as the 68HC11. Its RESET output sources up to 400µA (for T/S/R/Z/Y suffixes) and sinks up to 1.2mA, enabling controlled contention where the µP can override the supervisor's high state. This capability is explicitly confirmed in the "Interfacing to µPs with Bidirectional Reset Pins" section, and the MAX824REUK+T's 2.7V–3.6V VCC range aligns with modern low-voltage µP I/O levels.
MAX824REUK+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:
- 2.63V
- 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
MAX824REUK+T FAQ
1.How can I place an order for MAX824REUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX824REUK+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 MAX824REUK+T reliable?
The price and inventory of MAX824REUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX824REUK+T is usually 5 days.
3.What payment methods are accepted for MAX824REUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX824REUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX824REUK+T?
MAX824REUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX824REUK+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 MAX824REUK+T?
For technical support, including MAX824REUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX824REUK+T requirements.
6.How does Aetrix verify that MAX824REUK+T is sourced from the original manufacturer or authorized distributors?
All MAX824REUK+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 MAX824REUK+T meets industry standards.
7.What is the process for return or replacement of MAX824REUK+T?
All MAX824REUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX824REUK+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 MAX824REUK+T part is unused and in its original packaging.
Return procedure for MAX824REUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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