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Analog Devices Inc./Maxim Integrated MAX823MEXK+
- Part No.:
- MAX823MEXK+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX823MEXK+.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
- Shipping:
Inventory:1,717
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Product details
Overview
MAX823MEXK+ from Maxim Integrated is a 5-pin microprocessor supervisory circuit with active-low reset, watchdog timer, and manual reset input in SC70-5 package. It monitors +4.38V power supplies, asserts reset down to VCC = 1V, provides 140ms min power-on reset timeout, and features 1.6s watchdog timeout. It is used in embedded controllers and critical µP monitoring where supply transient immunity and guaranteed reset validity are required.
For engineers reviewing the MAX823MEXK+ datasheet, MAX823MEXK+ pinout, MAX823MEXK+ application, or MAX823MEXK+ equivalent, key selection factors include its 4.38V reset threshold, SC70-5 footprint, -40°C to +85°C operating range, and integrated watchdog/manual reset functions without external components.
Technical Context
The MAX823MEXK+ implements a precision voltage comparator with 40ppm/°C temperature coefficient and hysteresis of 10mV for stable reset assertion during brownout recovery. Its internal watchdog timer clears on any WDI edge (≥50ns pulse width) and times out after 1.6s if unrefreshed, enabling software execution monitoring.
Reset assertion is guaranteed for VCC ≥ 1V, with RESET output sourcing up to 120µA at VCC = VRST max and sinking 3.2mA at VCC = VRST min. The MR input includes a 52kΩ internal pullup resistor and responds to pulses ≥1.0µs, supporting direct CMOS or switch-based manual reset initiation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V ±1.5% - precisely matches +4.5V system rails with margin for tolerance drift |
| Reset Timeout Period | 140–280ms - ensures µP initialization completes before release |
| Watchdog Timeout | 1.12–2.40s - configurable via software refresh timing for robust fault detection |
| Supply Current | 6µA (SC70) - enables ultra-low-power operation in battery-powered equipment |
| Operating Temperature | -40°C to +85°C - supports industrial and automotive ambient conditions |
| VCC Validity Range | 1.0V to 5.5V - guarantees correct reset state during deep brownout and startup |
| MR Input Pullup | 52kΩ - eliminates need for external resistor; allows direct switch-to-ground connection |
Pinout & Package
MAX823MEXK+ uses the SC70-5 surface-mount package (2.0mm × 1.25mm × 0.9mm), optimized for space-constrained portable and embedded designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; sinks 3.2mA, sources 120µA; asserted until VCC > 4.38V + hysteresis and timeout expires |
| 2 | GND | Ground reference for all internal comparators and logic; must be low-impedance return path |
| 3 | WDI | Watchdog input; edge-sensitive (rising/falling); disables watchdog if left floating or three-stated |
| 4 | MR | Manual reset input; active-low with 52kΩ internal pullup; asserts reset for ≥1µs pulse and holds 200ms post-release |
| 5 | VCC | Supply input; operates from 1.0V to 5.5V; internally decoupled; requires local 0.1µF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Power-Supply Transient Immunity | Rejects negative-going VCC glitches ≤100ns at 100mV overdrive, preventing spurious resets in noisy environments |
| No External Components Required | Integrates voltage reference, comparator, timer, pullup resistor, and watchdog logic - reduces BOM count and PCB area |
| Guaranteed RESET Validity to VCC = 1V | Ensures deterministic reset behavior during deep undervoltage events, critical for safe µP shutdown |
| 140ms Minimum Power-On Reset | Meets JEDEC JESD88 requirements for reliable µP boot sequencing across temperature and voltage corners |
| Watchdog Timer with 1.6s Timeout | Enables fail-safe recovery from software lockups without host processor intervention |
Applications
| Embedded Controllers | Portable/Battery-Powered Equipment |
|---|---|
Use Scenario: Real-time control unit in industrial PLCs requiring deterministic restart after power interruption. IC Role / Device Role / Timing Role: Supervisory circuit providing power-on reset, brownout detection, and watchdog-triggered recovery. Use Value: Prevents corrupted firmware execution by holding µP in reset until VCC stabilizes above 4.38V and remains valid for ≥140ms. | Use Scenario: Handheld medical monitor powered by single Li-ion cell with dynamic load switching. IC Role / Device Role / Timing Role: Voltage supervisor ensuring µP only exits reset when battery voltage exceeds 4.38V and remains stable. Use Value: 6µA quiescent current extends battery life; 1V reset validity enables graceful shutdown as battery discharges below 3V. |
| Automotive Systems | Critical µP Monitoring |
Use Scenario: Body control module exposed to cold-crank transients and load-dump spikes. IC Role / Device Role / Timing Role: Reset generator immune to fast VCC transients, with manual reset for service mode entry. Use Value: Rejects ≤100ns negative glitches per Typical Operating Characteristics graph, avoiding false resets during engine cranking. | Use Scenario: Avionics data concentrator requiring certified fault containment and recovery. IC Role / Device Role / Timing Role: Dual-fault detector using both watchdog timeout and supply monitoring to trigger controlled reboot. Use Value: Independent 1.6s watchdog and 4.38V threshold provide orthogonal failure detection paths per DO-254 safety guidelines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX823TEXK+ | 3.08V reset threshold; identical SC70-5 package, pinout, and feature set | Targets +3.3V systems instead of +4.5V rails; lower threshold increases noise margin in low-voltage domains | Select MAX823TEXK+ when monitoring 3.3V supplies; MAX823MEXK+ is optimal for 4.5V nominal rails. |
| TPS3808G33DBVR | 3.3V threshold, 200ms reset timeout, 1.5µA supply current, SOT-23-5 package | Lacks watchdog and manual reset inputs; simpler supervision for cost-sensitive non-safety-critical applications | Choose TPS3808G33DBVR only if watchdog/manual reset are unnecessary; MAX823MEXK+ provides full feature integration. |
Compared with MAX823TEXK+, MAX823MEXK+ offers higher reset threshold for 4.5V systems and identical watchdog/manual reset capability; versus TPS3808G33DBVR, it adds critical safety features at slightly higher quiescent current and cost.
Availability
MAX823MEXK+ is available at Aetrix Electronics and suitable for embedded controllers, portable/battery-powered equipment, and automotive systems requiring stable component supply, lead-free compliance, and tape-and-reel delivery.
Supply support for MAX823MEXK+ 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.
The MAX823 family delivers integrated microprocessor supervision with reset, watchdog, and manual reset in ultra-small packages for space- and power-constrained embedded systems.
FAQ
What is the reset threshold voltage of the MAX823MEXK+?
The MAX823MEXK+ has a factory-trimmed reset threshold of 4.38V ±1.5%, specified over temperature (-40°C to +85°C). This value is confirmed in the Reset Threshold Table and Electrical Characteristics section of the datasheet, where VRST = 4.31V (min), 4.38V (typ), 4.45V (max) at TA = TMIN to TMAX. The threshold is designed for reliable supervision of +4.5V power rails with adequate margin.
Does the MAX823MEXK+ include a watchdog timer?
Yes, the MAX823MEXK+ includes a watchdog timer with a nominal timeout period of 1.6s (1.12–2.40s over temperature). The timer clears on any rising or falling edge at the WDI pin and triggers reset if unrefreshed. This function is explicitly enabled in the MAX823 variant per the Selector Guide and Detailed Description sections, distinguishing it from MAX824/MAX825 variants.
What package type and footprint does the MAX823MEXK+ use?
The MAX823MEXK+ uses the SC70-5 package (2.0mm × 1.25mm × 0.9mm), as confirmed in the Ordering Information table and Pin Configurations diagram. The "EXK" suffix denotes SC70-5 packaging with -40°C to +85°C temperature range, and the "+" indicates lead-free finish. This is distinct from SOT23-5 versions denoted by "EUK".
Can the MAX823MEXK+ operate with supply voltages below 2.0V?
Yes, the MAX823MEXK+ guarantees correct RESET output state down to VCC = 1.0V, as stated in the General Description and Electrical Characteristics tables. While its specified operating voltage range for the M-suffix device is +4.5V to +5.5V, the reset comparator remains functional and valid at VCC ≥ 1.0V, enabling safe brownout detection and controlled shutdown in low-voltage scenarios.
Is a manual reset input available on the MAX823MEXK+?
Yes, the MAX823MEXK+ includes a dedicated manual reset input (MR) pin, as confirmed in the Selector Guide (✔ under "Manual Reset Input" for MAX823), Pin Description table, and Detailed Description section. MR is active-low, features an internal 52kΩ pullup resistor, and accepts pulses ≥1.0µs, allowing direct interface with switches or CMOS logic without external components.
MAX823MEXK+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX823MEXK+ FAQ
1.How can I place an order for MAX823MEXK+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX823MEXK+ 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 MAX823MEXK+ reliable?
The price and inventory of MAX823MEXK+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX823MEXK+ is usually 5 days.
3.What payment methods are accepted for MAX823MEXK+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX823MEXK+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX823MEXK+?
MAX823MEXK+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX823MEXK+ 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 MAX823MEXK+?
For technical support, including MAX823MEXK+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX823MEXK+ requirements.
6.How does Aetrix verify that MAX823MEXK+ is sourced from the original manufacturer or authorized distributors?
All MAX823MEXK+ 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 MAX823MEXK+ meets industry standards.
7.What is the process for return or replacement of MAX823MEXK+?
All MAX823MEXK+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX823MEXK+, 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 MAX823MEXK+ part is unused and in its original packaging.
Return procedure for MAX823MEXK+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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