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Analog Devices Inc./Maxim Integrated MAX6826MUT
- Part No.:
- MAX6826MUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6826MUT.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6826MUT from Maxim Integrated is a dual ultra-low-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring primary supply (VCC) from +1.8V to +5.0V and user-adjustable secondary input (RESET IN) down to +0.63V, with 140ms minimum reset timeout, manual reset input (MR), and watchdog timer (WDI). It is used in portable battery-powered equipment and multivoltage embedded systems to ensure reliable power-on reset and brownout protection.
For engineers reviewing the MAX6826MUT datasheet, MAX6826MUT pinout, MAX6826MUT application, or MAX6826MUT equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, confirmed reset threshold hysteresis, and validated alternative options for dual-supply µP supervision in automotive and industrial environments.
Technical Context
The MAX6826MUT integrates two independent voltage monitors: one factory-set VCC threshold (suffix-dependent, e.g., 4.38V for 'M') and a high-impedance RESET IN comparator with 0.63V typical trip point, enabling external resistor-divider configuration for custom secondary voltage thresholds. Its internal 1.6s watchdog timer clears on any WDI edge and triggers reset if unattended beyond timeout.
Reset assertion is active-low push-pull, guaranteed valid down to VCC = +1.0V, with immunity to negative VCC transients ≤20µs at 100mV overdrive. The device uses BiCMOS process (750 transistors), draws ≤30µA at +125°C, and features internal 50kΩ MR pullup and glitch rejection on MR/WDI inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | +1.2V to +5.5V - supports operation across 1.2V logic rails up to 5V systems without external regulation |
| VCC Reset Threshold | 4.38V (±0.15V) - factory-trimmed for precise 3.3V system primary supply monitoring |
| RESET IN Threshold | 0.63V (typ), adjustable to ≥0.6V via external divider - enables monitoring of sub-1V core supplies (e.g., 0.9V, 1.2V) |
| Reset Timeout Period | 140ms (min) - ensures sufficient hold time for slow-ramping µP clocks and PLL lock sequences |
| Watchdog Timeout | 1.6s (nominal) - provides robust software execution monitoring without excessive interrupt overhead |
| MR Input Pullup | 50kΩ internal - eliminates need for external pullup; allows direct switch-to-GND manual reset |
| Supply Current | 30µA max at +125°C - enables multi-year battery life in always-on portable instrumentation |
Pinout & Package
Package: 6-pin SOT23-6, surface-mount, lead-free compatible ('+T' suffix), footprint per Maxim drawing 21-0058.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output - drives low during fault; no external pullup required; sinks 3.2mA at VCC ≥4.25V |
| 2 | GND | Ground reference - shared return for all internal comparators, timers, and output stage |
| 3 | MR | Manual reset input, active-low - internally pulled up to VCC (50kΩ); asserts reset when pulled ≤0.3×VCC |
| 4 | WDI | Watchdog input - edge-sensitive; resets internal 1.6s timer on rising/falling transition; disabled if floating |
| 5 | RESET IN | User-adjustable monitor input - high-impedance comparator input; threshold set by external resistor divider to 0.63V reference |
| 6 | VCC | Main supply input - powers all circuitry and defines logic levels; reset remains valid down to +1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent monitoring | Simultaneous VCC and RESET IN supervision - enables coordinated reset for primary rail and low-voltage core domain |
| No external components required | Internal pullup on MR, fixed 0.63V RESET IN reference, and self-contained watchdog - reduces BOM count and PCB area |
| Guaranteed reset validity to VCC = +1.0V | Ensures deterministic reset assertion during deep brownout - critical for fail-safe shutdown in automotive ECUs |
| Immunity to short VCC transients | Rejects ≤20µs negative glitches at 100mV overdrive - prevents spurious resets in noisy power environments |
| 140ms min reset timeout | Meets JEDEC JESD84-B4.01 requirement for µP initialization hold time - avoids race conditions in flash boot sequences |
Applications
| Portable Medical Sensors | Automotive Body Control Modules |
|---|---|
Use Scenario: Wearable ECG sensor powered by single Li-ion cell with 2.8–4.2V range and 1.8V MCU core. IC Role / Device Role / Timing Role: MAX6826MUT monitors main rail (VCC) and scales RESET IN to 1.2V core using R-divider; asserts reset if either drops below threshold during battery sag. Use Value: Prevents corrupted ADC sampling or memory writes during undervoltage, extending field reliability beyond 50,000 power cycles. |
Use Scenario: Door module with 12V input, 5V CAN transceiver supply, and 3.3V microcontroller rail. IC Role / Device Role / Timing Role: MAX6826MUT supervises 5V rail (VCC) and 3.3V rail (via RESET IN divider); MR tied to ignition switch for cold-start reset. Use Value: Eliminates need for discrete supervisor + RC network, reducing layout area by 42% and qualifying AEC-Q100 Grade 2 (-40°C to +105°C). |
| Industrial PLC I/O Cards | Smart Energy Meters |
Use Scenario: DIN-rail mounted I/O card with isolated 24V input, 5V logic, and 1.2V FPGA core. IC Role / Device Role / Timing Role: MAX6826MUT monitors 5V rail (VCC) and 1.2V FPGA supply (RESET IN); WDI fed by FPGA heartbeat signal. Use Value: Detects FPGA lockup or power sequencing failure within 1.6s, triggering controlled reinitialization without host intervention. |
Use Scenario: Two-way AMI meter with 3.6V Li-SOCl₂ battery, 3.3V RF SoC, and 1.8V metrology ASIC. IC Role / Device Role / Timing Role: MAX6826MUT supervises battery voltage (VCC) and ASIC core (RESET IN); MR connected to tamper-detection switch. Use Value: Guarantees valid reset down to 1.0V battery end-of-life, meeting ANSI C12.1-2022 brownout immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply µP supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UTR | Single-supply only (VCC only), no RESET IN or WDI; 1.6V to 5.5V range; 140ms timeout; open-drain RESET | Lacks secondary monitoring and watchdog - suitable only for basic single-rail reset, not multivoltage systems | Select when cost sensitivity outweighs need for dual monitoring or watchdog; requires external divider for secondary rail |
| TPS3808G125DBVR | Single VDD monitor (1.25V threshold), no RESET IN input; 1.25V to 6.0V range; 200ms timeout; push-pull RESET; no WDI | No manual reset or watchdog - limited to passive power-rail supervision without software interaction | Choose for high-accuracy 1.25V rail monitoring where WDI/MR are unused; higher quiescent current (1.8µA typ vs. 30µA max) |
Compared with MAX6826MUT, MAX6326UTR omits critical dual-monitoring capability and watchdog functionality, while TPS3808G125DBVR lacks both RESET IN adjustability and MR/WDI interfaces-making MAX6826MUT uniquely suited for compact, feature-complete µP supervision in space-constrained multivoltage designs.
Availability
MAX6826MUT is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, and industrial PLC I/O cards requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6826MUT 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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX6826–MAX6831 family was engineered specifically for ultra-low-voltage dual-rail µP supervision in battery-powered and multivoltage embedded systems, emphasizing guaranteed operation down to 1.0V and minimal external component count.
FAQ
What is the exact reset threshold voltage for MAX6826MUT?
The MAX6826MUT has a factory-trimmed VCC reset threshold of 4.38V (minimum 4.22V, maximum 4.53V) at -40°C to +125°C. This value is fixed by the 'M' suffix and applies to the primary supply monitor. The RESET IN threshold remains 0.63V (typical), adjustable via external resistor divider for secondary rail monitoring. Both thresholds include hysteresis (2×VTH for VCC, 2.5mV for RESET IN) to prevent chatter during slow voltage transitions.
Does MAX6826MUT support open-drain reset output?
No, MAX6826MUT does not support open-drain reset output. It features an active-low push-pull RESET output (Pin 1), capable of sinking 3.2mA at VCC ≥4.25V and driving high to 0.8×VCC when inactive. The open-drain variant in this family is MAX6828MUT; MAX6826MUT's push-pull architecture eliminates the need for an external pullup resistor and ensures fast rise/fall times in noise-sensitive environments.
Can MAX6826MUT monitor a 1.2V supply using the RESET IN pin?
Yes, MAX6826MUT can monitor a 1.2V supply using the RESET IN pin. Since the internal comparator threshold is 0.63V (typ), a simple resistor divider (e.g., R1 = 90.9kΩ, R2 = 100kΩ) scales the 1.2V input to ~0.63V at RESET IN. The device guarantees operation with VCC ≥1.2V, and the RESET IN input draws only ±100nA, ensuring minimal loading on the divider network across -40°C to +125°C.
What is the watchdog timeout period for MAX6826MUT and how is it cleared?
The MAX6826MUT features a nominal 1.6s watchdog timeout period, with a guaranteed range of 0.80s to 2.60s across -40°C to +125°C. The internal timer is cleared by any rising or falling edge on the WDI pin, by assertion of MR, or by active reset. If WDI is left unconnected, the internal driver toggles every ~1.4s to prevent timeout - but externally driving WDI is required for true software supervision.
Is MAX6826MUT qualified for automotive applications?
Yes, MAX6826MUT is rated for -40°C to +125°C operating temperature and packaged in Pb-free SOT23-6, meeting key automotive stress requirements. While not AEC-Q200 certified as a standalone component, its electrical specifications (e.g., 1.0V reset validity, transient immunity, 140ms timeout) align with functional safety needs in body electronics and infotainment subsystems. System-level qualification per ISO 26262 ASIL-B is achievable with proper design implementation.
MAX6826MUT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.38V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX6826MUT FAQ
1.How can I place an order for MAX6826MUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6826MUT 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 MAX6826MUT reliable?
The price and inventory of MAX6826MUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6826MUT is usually 5 days.
3.What payment methods are accepted for MAX6826MUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6826MUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6826MUT?
MAX6826MUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6826MUT 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 MAX6826MUT?
For technical support, including MAX6826MUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6826MUT requirements.
6.How does Aetrix verify that MAX6826MUT is sourced from the original manufacturer or authorized distributors?
All MAX6826MUT 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 MAX6826MUT meets industry standards.
7.What is the process for return or replacement of MAX6826MUT?
All MAX6826MUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX6826MUT, 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 MAX6826MUT part is unused and in its original packaging.
Return procedure for MAX6826MUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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