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Analog Devices Inc./Maxim Integrated MAX6826WUT-T
- Part No.:
- MAX6826WUT-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6826WUT-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
MAX6826WUT-T from Maxim Integrated is a dual ultra-low-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring primary supply (VCC) and user-adjustable secondary input (RESET IN) with push-pull active-low RESET output. It asserts reset when VCC falls below 1.67V (W-suffix), RESET IN drops below 0.63V, or manual reset/watchdog triggers - ensuring reliable power-up/brownout protection for battery-powered embedded systems.
For engineers reviewing the MAX6826WUT-T datasheet, MAX6826WUT-T pinout, MAX6826WUT-T application, or MAX6826WUT-T equivalent, key selection criteria include guaranteed reset validity down to VCC = +1.0V, 140ms minimum reset timeout, manual reset with internal 50kΩ pullup, 1.6s watchdog timer, and compatibility with multivoltage systems requiring precise low-threshold monitoring.
Technical Context
The MAX6826WUT-T integrates two independent voltage monitors: one factory-trimmed VCC threshold (1.67V ±0.055V over -40°C to +125°C) and one high-impedance RESET IN comparator with 0.63V typical trip point. Its push-pull RESET output drives low during fault conditions and returns high after 140–320ms timeout, with propagation delay under 20µs.
It features a 1.6s watchdog timer cleared by WDI edges or reset assertion, immune to short negative VCC transients (<20µs at 100mV overdrive), and operates with zero external components. The MR input includes internal 50kΩ pullup and 100ns glitch rejection, supporting momentary switch or CMOS-level reset initiation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 1.67V (W-suffix), ±0.055V over full temperature range - sets precise brownout detection for 1.8V systems |
| RESET IN Threshold | 0.63V typical, adjustable via resistor divider - enables monitoring of sub-1V rails like core supplies |
| Reset Timeout Period | 140ms minimum, up to 320ms - ensures µP completes power stabilization before release |
| Watchdog Timeout | 1.6s nominal, 0.8–2.6s over temperature - provides robust software execution monitoring |
| Operating Voltage Range | +1.2V to +5.5V on VCC - supports operation down to ultralow-voltage states while maintaining reset integrity |
| Supply Current | 30µA max at -40°C to +125°C - enables multi-year battery life in portable equipment |
| MR Input Pullup | 50kΩ internal - eliminates need for external resistor; allows direct switch-to-GND connection |
Pinout & Package
MAX6826WUT-T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant, lead-free compatible (ordered as +T variant). Pin 1 is marked with dot; pin numbering follows standard SOT23 top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output - drives low during fault and remains asserted for full timeout period |
| 2 | GND | Ground reference for all internal comparators and logic - must be low-impedance connection |
| 3 | MR | Manual reset input, active-low with internal 50kΩ pullup - initiates reset on falling edge; no external pullup needed |
| 4 | WDI | Watchdog input - toggling within 1.6s prevents reset; unconnected disables watchdog |
| 5 | RESET IN | User-adjustable monitor input - high-impedance node for resistor-divider network to set custom threshold ≥0.63V |
| 6 | VCC | Main supply input - powers device and defines primary reset threshold (1.67V for W-suffix) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent monitoring | Simultaneously supervises VCC (1.67V) and user-defined rail via RESET IN (0.63V base) - eliminates need for separate supervisors in multivoltage designs |
| No external components required | Internal pullup on MR, precision thresholds, and integrated timeout generator - reduces BOM count and PCB area in space-constrained applications |
| Guaranteed reset validity to VCC = +1.0V | Ensures deterministic reset behavior even during deep brownout - critical for fail-safe shutdown in automotive and industrial systems |
| Immunity to short VCC transients | Withstands ≤20µs negative glitches at 100mV overdrive without spurious reset - improves noise resilience in electrically harsh environments |
| 1.6s watchdog with edge-triggered clear | Timer resets on any WDI transition (rising or falling), not just periodic pulses - simplifies firmware integration and avoids stuck-loop blind spots |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Long-life coin-cell or Li-ion powered sensor nodes requiring reliable power-on reset and brownout recovery. IC Role / Device Role / Timing Role: Primary supervisor asserting active-low RESET to ARM Cortex-M0+ MCU during startup and voltage sag. Use Value: 30µA max ICC and VCC-down-to-1.0V operation extend battery life while ensuring deterministic reset across discharge curve. | Use Scenario: Industrial PLC I/O modules with dual-rail power (3.3V I/O, 1.2V core) needing coordinated reset sequencing. IC Role / Device Role / Timing Role: Monitors 3.3V VCC and 1.2V core rail via RESET IN divider; asserts synchronized reset to FPGA and microcontroller. Use Value: Eliminates discrete resistor networks and timing ICs - single-chip solution reduces footprint and qualification effort. |
| Intelligent Instruments | Automotive Systems |
Use Scenario: Handheld multimeters with LCD, ADC, and flash memory where corrupted boot must be prevented. IC Role / Device Role / Timing Role: Provides 140ms reset hold time and manual reset via front-panel button (MR pin). Use Value: Internal 50kΩ MR pullup removes external component; 100ns glitch rejection prevents false triggers from ESD events. | Use Scenario: Body control modules exposed to load-dump and cold-crank transients in 12V automotive systems. IC Role / Device Role / Timing Role: Supervises 5V regulated supply and 3.3V microcontroller rail; watchdog monitors firmware health. Use Value: Immunity to ≤20µs VCC glitches avoids nuisance resets during cranking; -40°C to +125°C rating meets AEC-Q100 ambient requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6827WUT-T | Active-high push-pull RESET output instead of active-low; identical thresholds, timing, and pinout | Required when host µP expects active-high reset assertion (e.g., certain Renesas RL78 variants) | Select MAX6827WUT-T only if system design mandates active-high reset polarity - same footprint and electrical behavior otherwise |
| TPS3808G16DBVR | Single-supply monitor (no RESET IN input); 1.6V threshold, 200ms timeout; SOT23-6 package | Lacks dual-monitor capability and adjustable secondary input - suitable only for single-rail systems | Choose TPS3808G16DBVR for cost-sensitive single-supply applications where RESET IN functionality is unnecessary |
Compared with MAX6827WUT-T, MAX6826WUT-T provides active-low reset polarity essential for legacy µPs like PIC16F and MSP430; versus TPS3808G16DBVR, it adds critical flexibility for monitoring core voltages below 1V via resistor-divider on RESET IN - enabling true dual-rail supervision in compact IoT endpoints.
Availability
MAX6826WUT-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, and intelligent instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6826WUT-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 demanding industrial, automotive, and computing applications.
The MAX6826–MAX6831 family was engineered specifically for ultralow-voltage microprocessor supervision in multirail systems, emphasizing guaranteed operation down to VCC = +1.0V and flexible secondary monitoring without external components.
FAQ
What is the exact VCC reset threshold voltage for MAX6826WUT-T?
The MAX6826WUT-T has a factory-trimmed VCC reset threshold of 1.67V, with tolerance of ±0.055V over the full operating temperature range (-40°C to +125°C). This value is specified in the Electrical Characteristics table under "VCC Reset Threshold (VCC Falling)" for the W-suffix variant and is validated across process corners and temperature extremes - ensuring consistent brownout detection for 1.8V supply rails.
Does MAX6826WUT-T support monitoring a 0.9V core supply?
Yes, MAX6826WUT-T supports monitoring a 0.9V core supply using its RESET IN pin. With a typical threshold of 0.63V, a resistor divider (e.g., R1 = 59kΩ, R2 = 100kΩ) scales the 0.9V rail to ~0.56V at RESET IN - below the 0.63V trip point. When the core voltage drops further, RESET IN falls below threshold and triggers reset. This method is explicitly validated in the datasheet's Figure 5 and Applications Information section.
What is the function of the WDI pin on MAX6826WUT-T?
The WDI (Watchdog Input) pin on MAX6826WUT-T monitors microprocessor activity: if WDI remains static (high or low) longer than the 1.6s watchdog timeout, the device asserts RESET for the full reset timeout period. The timer clears on any rising or falling edge at WDI, enabling flexible firmware integration. Leaving WDI unconnected disables the watchdog function entirely - a feature confirmed in the Pin Description and Detailed Description sections of the datasheet.
Can MAX6826WUT-T operate reliably during cold-crank automotive conditions?
Yes, MAX6826WUT-T is rated for -40°C to +125°C operation and guarantees valid reset assertion down to VCC = +1.0V - well below typical cold-crank minimums (~2.2V). Its immunity to ≤20µs negative VCC transients (per Typical Operating Characteristics graph toc06) prevents spurious resets during load-dump events. These characteristics make MAX6826WUT-T suitable for body control modules and infotainment power supervisors in automotive applications.
Is an external pullup resistor required on the MR pin of MAX6826WUT-T?
No, an external pullup resistor is not required on the MR pin of MAX6826WUT-T. The device integrates a 50kΩ internal pullup resistor to VCC, as documented in the Pin Description and Electrical Characteristics tables. MR can be left floating or connected directly to a momentary switch to GND - eliminating BOM items and simplifying layout. This internal pullup is functional across the full temperature and voltage range.
MAX6826WUT-T 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:
- 1.67V, 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
MAX6826WUT-T FAQ
1.How can I place an order for MAX6826WUT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6826WUT-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 MAX6826WUT-T reliable?
The price and inventory of MAX6826WUT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6826WUT-T is usually 5 days.
3.What payment methods are accepted for MAX6826WUT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6826WUT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6826WUT-T?
MAX6826WUT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6826WUT-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 MAX6826WUT-T?
For technical support, including MAX6826WUT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6826WUT-T requirements.
6.How does Aetrix verify that MAX6826WUT-T is sourced from the original manufacturer or authorized distributors?
All MAX6826WUT-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 MAX6826WUT-T meets industry standards.
7.What is the process for return or replacement of MAX6826WUT-T?
All MAX6826WUT-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6826WUT-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 MAX6826WUT-T part is unused and in its original packaging.
Return procedure for MAX6826WUT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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