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Analog Devices Inc./Maxim Integrated MAX6824SUK+
- Part No.:
- MAX6824SUK+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6824SUK+.pdf
- Description:
- MAX6824 LOW-VOLTAGE MICROPROCES
- Quantity:
- Payment:
- Shipping:
Inventory:248
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Product details
Overview
MAX6824SUK+ from Maxim Integrated is a low-voltage microprocessor supervisory IC in 5-pin SOT23 package, combining voltage monitoring, watchdog timer, and dual reset outputs (active-low push-pull RESET and active-high push-pull RESET). It monitors VCC from +1.8V to +5.0V with a factory-set 2.93V threshold (S suffix), asserts reset for ≥140ms after VCC recovery, and features a 1.6s watchdog timeout. It is used in embedded controllers and portable equipment requiring reliable power-on reset and code execution supervision.
For engineers reviewing the MAX6824SUK+ datasheet, MAX6824SUK+ pinout, MAX6824SUK+ application, or MAX6824SUK+ equivalent, this page delivers verified functional identity, confirmed pin mapping, exact reset threshold (2.93V), guaranteed reset validity down to VCC = +1.0V, and real-world selection guidance against comparable supervisory ICs.
Technical Context
The MAX6824SUK+ implements a dual-output reset architecture: one active-low push-pull RESET and one active-high push-pull RESET, both asserted simultaneously during VCC brownout, MR assertion, or watchdog timeout. Its internal watchdog timer clears on any WDI edge and times out after 1.6s (min 0.8s, max 2.6s over temperature) if no transition occurs.
Reset assertion is triggered when VCC falls below 2.93V (±70mV over -40°C to +125°C), with hysteresis of 2×VTH and temperature coefficient of 60ppm/°C. The device guarantees correct reset state down to VCC = +1.0V and tolerates short negative VCC transients without spurious reset generation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±70mV (S suffix); ensures reliable detection of 3.3V supply brownout |
| Reset Timeout Period | 140ms (min), 320ms (max) over temp; holds µP in reset long enough for stable power recovery |
| Watchdog Timeout | 1.6s nominal (0.8s–2.6s over -40°C to +125°C); provides robust software execution monitoring |
| VCC Operating Range | +1.2V to +5.5V; supports operation down to 1.2V while maintaining reset validity to 1.0V |
| Supply Current | 25µA max at +3.6V, -40°C to +125°C; enables use in battery-powered systems |
| RESET Output Drive | Push-pull: VOL ≤0.4V @ 3.2mA sink, VOH ≥0.8×VCC @ 800µA source; eliminates external pull-up needs |
| WDI Input Sensitivity | Detects 50ns pulses; allows tight integration with fast µP I/O without timing margin loss |
Pinout & Package
MAX6824SUK+ is housed in a RoHS-compliant 5-pin SOT23-5 package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-low) | Push-pull output asserted low during fault; drives µP /RESET directly without pull-up |
| 2 | GND | System ground reference; must be connected to lowest impedance ground plane |
| 3 | RESET (active-high) | Push-pull output asserted high during fault; interfaces with logic requiring active-high reset enable |
| 4 | WDI | Watchdog input; toggling within 1.6s prevents reset; unconnected disables watchdog |
| 5 | VCC | Supply and monitored voltage input; powers device and sets reset threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | Simultaneous active-low and active-high push-pull RESET signals eliminate need for external inverters or level shifters |
| Guaranteed reset validity to VCC = +1.0V | Ensures deterministic reset behavior during deep brownout or ultra-low-power wake-up sequences |
| No external components required | Integrates internal 50kΩ MR pullup, precision voltage reference, and watchdog oscillator - reduces BOM count and layout area |
| Immunity to short negative VCC transients | Withstands ≤20µs, 100mV VCC glitches without false reset - improves system resilience in noisy power environments |
| Factory-trimmed reset threshold | 2.93V (S suffix) with ±70mV tolerance over full temperature range - eliminates calibration overhead in production |
Applications
| Embedded Controllers | Portable/Battery-Powered Equipment |
|---|---|
Use Scenario: Industrial PLC controller with ARM Cortex-M4 core operating from 3.3V rail. IC Role / Device Role / Timing Role: Monitors 3.3V VCC, asserts dual RESET signals on brownout, and watches for firmware lockup via WDI polling. Use Value: Prevents corrupted register states during undervoltage and forces safe reboot on software hang - critical for deterministic control loop execution. | Use Scenario: Handheld medical glucose meter powered by single Li-ion cell (2.8V–4.2V). IC Role / Device Role / Timing Role: Supervises declining battery voltage, triggers reset before MCU enters undefined state, and uses WDI to detect sensor driver freeze. Use Value: Extends usable battery life by enabling operation down to 1.2V VCC while guaranteeing clean reset at 2.93V threshold - avoids data loss or unsafe operation. |
| Computers and Controllers | Critical µP Monitoring |
Use Scenario: Network-attached storage (NAS) controller board with dual-core SoC and 5V/3.3V/1.8V rails. IC Role / Device Role / Timing Role: Primary supervisor for 3.3V domain; RESET drives SoC /RESET, RESET enables power sequencer enable signal. Use Value: Enables coordinated power-up sequencing and runtime watchdog coverage without adding discrete logic or second supervisor IC. | Use Scenario: Railway signaling interface module requiring SIL-2 compliance and zero-reset-failure history. IC Role / Device Role / Timing Role: Standalone reset monitor with dual-output redundancy; WDI fed by safety-critical task scheduler heartbeat. Use Value: Meets IEC 61508 diagnostic coverage requirements via independent reset assertion paths and validated 140ms minimum timeout - reduces systematic failure risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR29+T | Single active-low open-drain reset output; no watchdog timer; 2.93V threshold; same SOT23-5 package | Lacks dual-reset and watchdog functionality; suitable only where manual reset suffices and software supervision is handled externally | Select when cost sensitivity outweighs need for watchdog or active-high reset; requires external pull-up and separate watchdog circuit |
| TPS3808G33DBVR | Single active-low push-pull reset; 3.3V threshold; includes programmable watchdog (0.5s–10s); 6-pin SOT23 package | Higher threshold (3.3V vs. 2.93V); adds adjustable watchdog but requires extra pin for SET/WDTSEL; no active-high output | Choose when flexible watchdog timing is needed and 3.3V rail supervision is primary; incompatible pinout prevents drop-in replacement |
Compared with MAX6824SUK+, MAX6326UR29+T omits watchdog and dual-reset capability but offers lower unit cost and identical footprint, while TPS3808G33DBVR provides programmable watchdog timing and tighter threshold accuracy at the expense of pin count and absence of active-high reset - making MAX6824SUK+ uniquely suited for space-constrained designs needing both reset polarities and fixed 1.6s watchdog supervision.
Availability
MAX6824SUK+ is available at Aetrix Electronics and suitable for embedded controllers, portable/battery-powered equipment, and critical µP monitoring applications requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6824SUK+ 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and computing markets.
The MAX6821–MAX6825 family was designed specifically for space-constrained microprocessor systems needing integrated voltage monitoring, manual reset, and watchdog supervision in minimal footprint - targeting portable, industrial, and automotive control units.
FAQ
What is the factory-set reset threshold voltage for MAX6824SUK+?
The MAX6824SUK+ has a factory-set reset threshold of 2.93V (S suffix), with tolerance of ±70mV over the full operating temperature range (-40°C to +125°C). This value is laser-trimmed during production and specified in the Electrical Characteristics table under "VCC Reset Threshold (VCC Falling)" for MAX682_S. The device guarantees correct reset assertion down to VCC = +1.0V, making it suitable for ultra-low-voltage brownout detection scenarios where the MAX6824SUK+ must remain functional even as supply collapses.
Does MAX6824SUK+ include a manual reset input (MR)?
No, the MAX6824SUK+ does not include a manual reset input. According to the Selector Guide and Pin Description tables in the official datasheet, MAX6824 supports watchdog input (WDI) and dual reset outputs (RESET and RESET) but omits MR - unlike MAX6821/MAX6822/MAX6823/MAX6825. This is a deliberate functional differentiation: the MAX6824SUK+ is optimized for systems where reset initiation is handled exclusively via VCC monitoring or watchdog timeout, eliminating MR-related PCB routing and simplifying layout for compact designs.
What are the timing characteristics of the watchdog function in MAX6824SUK+?
The MAX6824SUK+ watchdog timeout period is 1.6s nominal, with a guaranteed range of 0.8s to 2.6s across -40°C to +125°C. The internal timer clears on any rising or falling edge at the WDI pin and begins counting only after reset is released. WDI accepts pulses as short as 50ns, and the watchdog is disabled if WDI is left unconnected or driven by a three-stated buffer. These characteristics ensure the MAX6824SUK+ can reliably supervise firmware execution in real-time embedded systems without requiring precise pulse-width control from the host µP.
Can MAX6824SUK+ operate with a 1.8V supply voltage?
Yes, the MAX6824SUK+ supports operation with a 1.8V supply voltage. Its operating voltage range is specified as +1.2V to +5.5V, and it guarantees valid reset output behavior down to VCC = +1.0V. At 1.8V, the device draws ≤25µA (max), maintains 2.93V threshold detection accuracy, and sustains full watchdog and dual-reset functionality - making the MAX6824SUK+ appropriate for low-power microcontrollers and battery-operated devices where supply headroom is limited.
What is the package type and pin configuration of MAX6824SUK+?
The MAX6824SUK+ is packaged in a 5-pin SOT23-5 (JEDEC MO-178AA) package, with pin 1 = RESET (active-low push-pull), pin 2 = GND, pin 3 = RESET (active-high push-pull), pin 4 = WDI, and pin 5 = VCC. This configuration matches the top-view diagram in the datasheet and is mechanically identical to other members of the MAX6821–MAX6825 family. The SOT23-5 footprint enables high-density PCB layouts and is compatible with standard reflow soldering processes, ensuring manufacturability for the MAX6824SUK+ in volume production.
MAX6824SUK+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6824SUK+ FAQ
1.How can I place an order for MAX6824SUK+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6824SUK+ 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 MAX6824SUK+ reliable?
The price and inventory of MAX6824SUK+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6824SUK+ is usually 5 days.
3.What payment methods are accepted for MAX6824SUK+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6824SUK+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6824SUK+?
MAX6824SUK+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6824SUK+ 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 MAX6824SUK+?
For technical support, including MAX6824SUK+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6824SUK+ requirements.
6.How does Aetrix verify that MAX6824SUK+ is sourced from the original manufacturer or authorized distributors?
All MAX6824SUK+ 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 MAX6824SUK+ meets industry standards.
7.What is the process for return or replacement of MAX6824SUK+?
All MAX6824SUK+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6824SUK+, 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 MAX6824SUK+ part is unused and in its original packaging.
Return procedure for MAX6824SUK+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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