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Analog Devices Inc./Maxim Integrated MAX824REXK-T
- Part No.:
- MAX824REXK-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX824REXK-T.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:95,000
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Product details
Overview
MAX824REXK-T from Maxim Integrated is a 5-pin SC70-packaged microprocessor supervisory circuit with active-low and active-high reset outputs, watchdog timer (1.6s timeout), and immunity to fast VCC transients down to 1V. It monitors +2.63V power supplies with ±1.5% threshold accuracy over -40°C to +85°C, enabling reliable brownout detection in battery-powered embedded controllers.
For engineers reviewing the MAX824REXK-T datasheet, MAX824REXK-T pinout, MAX824REXK-T application, or MAX824REXK-T equivalent, this device serves as a precision voltage-monitoring supervisor for systems requiring dual-reset polarity, transient-robust reset assertion, and watchdog-enabled firmware recovery without external components.
Technical Context
The MAX824REXK-T integrates a precision bandgap-based reset comparator with 5mV hysteresis and 40ppm/°C temperature coefficient, ensuring stable threshold behavior across industrial temperature ranges. Its dual-reset architecture delivers complementary active-low RESET and active-high RESET outputs, both guaranteed functional down to VCC = 1V.
Watchdog functionality uses an internal 1.6s timeout timer cleared by edges on WDI; it disables automatically when WDI is unconnected or three-stated. The device operates with only 2µA supply current in SC70 package and requires no external timing or pullup components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±1.5% at +25°C; enables precise monitoring of +2.6V rails in portable instrumentation |
| Supply Current | 2µA typical (SC70); supports ultra-low-power operation in battery-backed systems |
| Reset Timeout | 140ms minimum; ensures sufficient hold time for µP initialization during power-up |
| Watchdog Timeout | 1.6s nominal; provides robust firmware hang detection without software overhead |
| Operating Temp | -40°C to +85°C; qualified for industrial and automotive under-hood environments |
| VCC Immunity | Valid reset assertion down to VCC = 1V; maintains supervision during deep brownouts |
| Package | SC70-5; 2.0mm × 2.1mm footprint ideal for space-constrained PCB layouts |
Pinout & Package
MAX824REXK-T is housed in a 5-pin SC70 package (2.0mm × 2.1mm, 0.65mm pitch) with gull-wing leads, optimized for automated assembly and thermal performance in compact designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-low) | Asserts logic-low reset pulse for ≥140ms on power-up, brownout, or WDI timeout |
| 2 | GND | Ground reference for all internal comparators and output drivers |
| 3 | WDI | Watchdog input; edge-sensitive trigger requiring ≥50ns pulses to reset 1.6s timer |
| 4 | RESET (active-high) | Complementary output to pin 1; high during normal operation, low during reset |
| 5 | VCC | Power supply input; operates from 2.7V to 3.6V for R-threshold variant |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity reset outputs | Simultaneous active-low and active-high reset signals eliminate need for external inverters in bidirectional reset interfaces |
| 1.6s watchdog timer | Hardware-enforced firmware recovery path that triggers reset if µP fails to toggle WDI within timeout window |
| 2.63V precision threshold | Factory-trimmed reset point matching common +2.6V LDO outputs used in low-voltage microcontrollers |
| 1V reset validity | Guaranteed correct reset state even during severe brownout conditions where VCC drops below 1.2V |
| No external components | Internal 52kΩ MR pullup and self-contained timing eliminate capacitors, resistors, or trim pots |
Applications
| Industrial PLC I/O Modules | Portable Medical Sensors |
|---|---|
Use Scenario: Compact programmable logic controller modules powered by single-cell Li-ion batteries with variable discharge profiles. IC Role / Device Role / Timing Role: Supervisory circuit providing dual-reset signaling to ARM Cortex-M0+ MCU and FPGA configuration logic during battery voltage sag. Use Value: Prevents erratic operation during 2.7V–3.3V brownout transitions using 2.63V threshold and 140ms timeout, while WDI monitors firmware health. | Use Scenario: Handheld ECG or pulse oximeter devices requiring fail-safe boot sequencing and low-power operation. IC Role / Device Role / Timing Role: Voltage monitor and watchdog supervisor for ultra-low-power MSP430 microcontroller running clinical firmware. Use Value: 2µA quiescent current extends battery life; 1V reset validity ensures supervision remains active until battery reaches end-of-life at ~2.2V. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: Under-dash electronic control units exposed to load-dump and cold-crank transients in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: Reset generator and watchdog enforcer for Infineon AURIX TC2xx MCU managing door lock, lighting, and HVAC functions. Use Value: Immunity to sub-100ns VCC glitches prevents spurious resets during alternator switching; -40°C to +85°C rating covers full automotive ambient range. | Use Scenario: DIN-rail mounted electricity meters with isolated RS-485 communication and tamper detection logic. IC Role / Device Role / Timing Role: Power-on reset and brownout detector for Renesas RL78/I1C MCU handling metrology calculations and secure firmware updates. Use Value: Complementary RESET/RESET outputs interface directly with both MCU reset pin and isolated gate driver enable logic, reducing BOM count. |
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 | SOT23-5 package, -40°C to +125°C rating, same 2.93V threshold and dual-reset functionality | Better suited for under-hood automotive applications requiring extended temperature range | Select when operating ambient exceeds +85°C or board layout accommodates larger SOT23 footprint |
| TPS3808G33DBVR | Texas Instruments part with 3.3V threshold, 350ms reset timeout, and 1.25µA supply current | Lacks watchdog timer and manual reset; offers tighter 0.5% threshold accuracy | Choose when only basic reset supervision is needed and ultra-low current (<2µA) is critical |
Compared with MAX824REXK-T, MAX824SEUK-T provides higher temperature capability in a larger package, while TPS3808G33DBVR trades watchdog functionality for lower quiescent current and improved threshold tolerance-neither is pin-compatible, requiring PCB redesign.
Availability
MAX824REXK-T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, portable medical sensors, automotive body control units, and smart energy meters requiring stable component supply and long-term lifecycle support.
Supply support for MAX824REXK-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, and communications markets, emphasizing reliability, integration, and low-power operation.
The MAX823/MAX824/MAX825 family targets cost-sensitive embedded systems needing compact, self-contained reset supervision with watchdog safety features-specifically engineered for µP-based equipment where board space and external component count are constrained.
FAQ
What is the exact reset threshold voltage of the MAX824REXK-T and how is it specified?
The MAX824REXK-T has a factory-trimmed reset threshold of 2.63V, with ±1.5% tolerance over the full -40°C to +85°C operating range and 40ppm/°C temperature coefficient. This value is confirmed in the Reset Threshold Table and Electrical Characteristics section of the official datasheet, applying specifically to the "R" suffix variant in SC70 packaging.
Does the MAX824REXK-T include both active-low and active-high reset outputs?
Yes, the MAX824REXK-T provides complementary reset outputs: pin 1 is active-low RESET and pin 4 is active-high RESET. This dual-output architecture is explicitly defined in the Pin Description and Selector Guide sections, distinguishing it from the MAX823 (active-low only) and MAX825 (active-high only with manual reset).
What is the watchdog timeout period of the MAX824REXK-T and how is it triggered?
The MAX824REXK-T features a 1.6s nominal watchdog timeout period, with a guaranteed range of 1.12s to 2.40s over temperature. It triggers a reset if the WDI input (pin 3) remains static-either high or low-for longer than this interval. Edges on WDI reset the timer, and the function disables automatically when WDI is left unconnected or three-stated.
Can the MAX824REXK-T operate reliably during deep brownout conditions?
Yes, the MAX824REXK-T guarantees correct reset output states down to VCC = 1V, as verified in the Absolute Maximum Ratings and Electrical Characteristics tables. This allows continuous supervision during severe brownouts where other supervisors may lose functionality, making it suitable for battery-powered systems approaching end-of-discharge.
What package type and footprint does the MAX824REXK-T use?
The MAX824REXK-T uses the SC70-5 package: a 5-pin surface-mount outline measuring 2.0mm × 2.1mm with 0.65mm lead pitch. This is confirmed in the Ordering Information table and Package Information section, and differs from the SOT23-5 option used in higher-temperature variants like MAX824SEUK-T.
MAX824REXK-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Bulk
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
MAX824REXK-T FAQ
1.How can I place an order for MAX824REXK-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX824REXK-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 MAX824REXK-T reliable?
The price and inventory of MAX824REXK-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX824REXK-T is usually 5 days.
3.What payment methods are accepted for MAX824REXK-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX824REXK-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX824REXK-T?
MAX824REXK-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX824REXK-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 MAX824REXK-T?
For technical support, including MAX824REXK-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX824REXK-T requirements.
6.How does Aetrix verify that MAX824REXK-T is sourced from the original manufacturer or authorized distributors?
All MAX824REXK-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 MAX824REXK-T meets industry standards.
7.What is the process for return or replacement of MAX824REXK-T?
All MAX824REXK-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX824REXK-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 MAX824REXK-T part is unused and in its original packaging.
Return procedure for MAX824REXK-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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