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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 1 CHANNEL SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,281
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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 precision reset threshold of 2.63V ±15mV. It operates from 2.7V to 3.6V, draws only 2µA typical supply current, and guarantees RESET validity down to VCC = 1V - used in embedded controllers and portable equipment for reliable power-on/brownout reset and software fault recovery.
For engineers reviewing the MAX824REXK+T datasheet, MAX824REXK+T pinout, MAX824REXK+T application, or MAX824REXK+T equivalent, this page delivers verified functional identity, confirmed SC70-5 package mapping, validated 5-pin terminal roles, exact reset threshold and watchdog timing, and two field-validated alternative parts for µP monitoring designs requiring 2.63V threshold and dual-reset polarity.
Technical Context
The MAX824REXK+T integrates a precision voltage comparator with 40ppm/°C temperature coefficient, a monostable watchdog timer cleared by WDI edge transitions, and dual complementary reset outputs driven by a single internal reset generator. Its reset timeout is fixed at 140ms minimum and fully specified over –40°C to +85°C.
It features transient-immune reset detection that ignores VCC glitches below 100ns duration at 200mV overdrive, and includes internal 52kΩ MR pullup (not applicable to MAX824) - confirming this variant excludes manual reset but retains watchdog input and both RESET/RESET outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±15mV - sets precise brownout detection point for 2.7–3.6V systems |
| Watchdog Timeout | 1.6s nominal - provides deterministic software execution monitoring window |
| Supply Current | 2µA typical (SC70) - enables multi-year battery life in portable applications |
| Reset Timeout Period | 140ms min - ensures sufficient hold time for µP initialization sequences |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive under-hood environments |
| VCC Range | 2.7V to 3.6V - matches 3.3V logic and low-voltage microcontroller rails |
| Reset Propagation Delay | 20µs max - guarantees fast response to VCC dip below threshold |
Pinout & Package
MAX824REXK+T is housed in a lead-free SC70-5 package (2.0mm × 1.25mm × 0.95mm), optimized for space-constrained PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low reset output | Drives low for ≥140ms on power-up, brownout, or watchdog timeout; sinks 1.2mA @ VCC = VRST min |
| 2 - GND | Ground reference | Return path for all internal circuits; must be low-impedance connection to system ground plane |
| 3 - WDI | Watchdog input | Edge-sensitive input; rising/falling edges clear 1.6s timer; unconnected disables watchdog |
| 4 - RESET | Active-high reset output | Complementary to pin 1; logic high during valid operation; sources 0.8×VCC @ 150µA |
| 5 - VCC | Power supply input | Accepts 2.7V–3.6V; internally regulated for comparator and timer; requires local 0.1µF bypass |
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 software supervision without CPU overhead for periodic pulse generation |
| 2.63V precision reset threshold (±15mV) | Matches 2.7V/3.0V system rails with margin for voltage droop and tolerance stacking |
| 2µA typical quiescent current (SC70) | Extends battery runtime in always-on monitoring nodes and IoT endpoint devices |
| VCC transient immunity (100ns @ 200mV overdrive) | Prevents spurious resets from switching noise or ESD-induced supply glitches |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
|
Use Scenario: Power sequencing and runtime supervision in DIN-rail mounted programmable logic controllers exposed to 24V rail transients. IC Role / Device Role / Timing Role: Supervisory circuit providing brownout reset, watchdog-triggered recovery, and dual-polarity reset signaling to ARM Cortex-M7 host MCU. Use Value: Guarantees clean restart after line dips; 2.63V threshold aligns with 3.3V I/O domain; 2µA draw minimizes auxiliary supply loading. |
Use Scenario: Battery-powered ECG and SpO₂ monitors requiring fail-safe boot and crash recovery without user intervention. IC Role / Device Role / Timing Role: System-level reset manager asserting both active-low and active-high signals to microcontroller and analog front-end ASIC. Use Value: 140ms reset pulse ensures full ADC calibration before data acquisition; SC70 footprint saves board area in compact enclosures. |
| Automotive Body Control Modules | Smart Energy Meters |
|
Use Scenario: Reset coordination in 12V-derived 3.3V domains for door module ECUs operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Voltage supervisor detecting battery undervoltage events and triggering watchdog-initiated firmware rollback. Use Value: 40ppm/°C threshold drift maintains accuracy over full temp range; dual outputs interface directly with CAN transceiver reset and MCU nRST. |
Use Scenario: Tamper-resistant metering platforms where unexpected code lockup must trigger hardware reset without external intervention. IC Role / Device Role / Timing Role: Independent watchdog supervisor monitoring application processor execution via dedicated GPIO toggle. Use Value: 1.6s timeout balances responsiveness and false-trigger avoidance; 2.63V threshold avoids nuisance resets during AC line sags. |
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 | Same functionality, SOT23-5 package, –40°C to +125°C rating | Required for under-hood automotive applications exceeding +85°C ambient | Select when extended temperature operation and larger SOT23 thermal mass are needed |
| TPS3808G33DBVR | 2.93V fixed threshold, 3.3V supply range, no active-high reset output | Lacks complementary reset; requires external inverter for dual-polarity signaling | Choose only if 2.93V threshold suffices and board space allows added passive components |
Compared with MAX824REXK+T, MAX824SEUK+T offers identical function with higher temperature grade and different package, while TPS3808G33DBVR provides lower-cost supervision at the cost of missing active-high reset and reduced threshold precision - making MAX824REXK+T optimal for space-constrained, dual-output, 2.63V-critical designs.
Availability
MAX824REXK+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, smart energy meters, and battery-powered instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
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 computing applications, with expertise in power management and supervisory circuits.
The MAX823/MAX824/MAX825 family was engineered specifically for reliable µP reset generation, watchdog supervision, and manual reset integration in resource-constrained embedded systems - with MAX824REXK+T targeting 2.63V 3.3V-domain applications needing dual-reset polarity.
FAQ
What is the exact reset threshold voltage of the MAX824REXK+T?
The MAX824REXK+T has a factory-trimmed reset threshold of 2.63V, with ±15mV tolerance over temperature and supply variations. This value is guaranteed across the full –40°C to +85°C operating range and applies to both RESET and RESET outputs. The threshold is set using laser trimming during wafer sort and is documented in the Reset Threshold Table of the official datasheet.
Does the MAX824REXK+T include a manual reset input (MR)?
No, the MAX824REXK+T does not include a manual reset input. Per the Selector Guide and Pin Description, MAX824 variants provide watchdog input (WDI) and complementary reset outputs (RESET and RESET), but omit MR functionality - which is exclusive to MAX823 and MAX825. The MAX824REXK+T pinout contains only VCC, GND, WDI, RESET, and RESET terminals.
What is the watchdog timeout period for the MAX824REXK+T, and how is it cleared?
The MAX824REXK+T features a watchdog timeout period of 1.60 seconds nominal, with 1.12s to 2.40s min/max limits over temperature. It is cleared by any rising or falling edge on the WDI pin - including pulses as short as 50ns - or automatically by assertion of the RESET signal. Leaving WDI unconnected disables the watchdog function entirely.
Can the MAX824REXK+T operate from a 2.5V supply?
No, the MAX824REXK+T is not rated for 2.5V operation. Its specified VCC range is 2.7V to 3.6V, as defined by the MAX82_R suffix group in the Electrical Characteristics table. At 2.5V, the internal voltage reference and comparator may not function reliably, and reset assertion is not guaranteed - use MAX824SEUK+T with R-suffix only within its validated 2.7V–3.6V window.
Is the MAX824REXK+T pin-compatible with other MAX824 variants in SC70-5?
Yes, all MAX824 variants in SC70-5 packaging - including MAX824REXK+T, MAX824SEUK+T, and MAX824TEUK+T - share identical pinout, footprint, and terminal functions. The only differences are reset threshold voltage (R = 2.63V, S = 2.93V, T = 3.08V) and temperature grade (EXK = –40°C to +85°C, EUK = –40°C to +125°C). No PCB redesign is required when substituting within the same package type.
MAX824REXK+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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 ~ 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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