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Analog Devices Inc./Maxim Integrated MAX6826WUT
- Part No.:
- MAX6826WUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6826WUT.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6826WUT 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 140ms min reset timeout, manual reset (MR), and watchdog timer (WDI). It asserts active-low push-pull RESET when VCC falls below 1.67V (W-suffix threshold) or RESET IN drops below 0.63V, ensuring reliable power-up/brownout protection in battery-powered embedded systems.
For engineers reviewing the MAX6826WUT datasheet, MAX6826WUT pinout, MAX6826WUT application, or MAX6826WUT equivalent, this page delivers verified electrical parameters, SOT23-6 terminal mapping, real-world use cases for multivoltage portable equipment, and two validated alternative supervisors with documented functional and interface differences.
Technical Context
The MAX6826WUT integrates dual-supply monitoring with independent thresholds: factory-trimmed VCC reset at 1.67V (±30mV over -40°C to +125°C) and high-impedance RESET IN comparator with 0.63V typical trip point. Its internal 140ms reset timeout generator ensures stable deassertion after supply recovery, while the 1.6s watchdog timer clears on WDI edge transitions or MR assertion.
It features an internal 50kΩ pullup on MR, supports CMOS-level manual reset triggering, and uses BiCMOS process for guaranteed reset validity down to VCC = +1.0V. The push-pull RESET output drives low to 0.3V at 1.2mA sink current and high to ≥0.8×VCC at 200µA source, eliminating external pullups for active-low µP interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 1.67V (W-suffix), ±30mV 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 - ensures µP completes power stabilization before release |
| Watchdog Timeout | 1.6s nominal - provides robust software execution monitoring without excessive overhead |
| Operating Voltage Range | +1.53V to +2.0V for VCC - supports ultra-low-power operation in battery-backed applications |
| RESET Output Type | Active-low push-pull - eliminates need for external pullup resistor on µP reset line |
| Supply Current | 30µA max at -40°C to +125°C - minimizes quiescent drain in always-on monitoring circuits |
Pinout & Package
MAX6826WUT is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant, with gull-wing leads and thermal pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; sinks 1.2mA at VCC ≥ 2.55V; asserts during VCC/RESET IN undervoltage, MR low, or WDI timeout |
| 2 | GND | Ground reference for all internal comparators, timers, and output stage |
| 3 | MR | Manual reset input, active-low, internally pulled up to VCC with 50kΩ - momentary GND connection forces system reset |
| 4 | WDI | Watchdog input; toggling within 1.6s prevents reset; left floating or three-stated disables watchdog function |
| 5 | RESET IN | User-adjustable monitor input; high-impedance comparator with 0.63V threshold - connects to resistor divider for custom voltage sensing |
| 6 | VCC | Main supply input; powers internal circuitry and defines operating range (+1.53V to +2.0V); reset valid down to +1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent monitoring | Simultaneous VCC (1.67V) and RESET IN (0.63V) supervision enables coordinated reset across primary and core supplies |
| No external components required | Internal pullup on MR, fixed threshold comparators, and integrated timeout generators eliminate discrete R/C networks |
| Immunity to short VCC transients | Withstands ≤20µs negative glitches down to 100mV below threshold - avoids spurious resets in noisy environments |
| Guaranteed operation to VCC = +1.0V | Ensures deterministic reset behavior during deep brownout, critical for data retention in backup power scenarios |
| Low-quiescent-current design | 30µA max ICC over full temperature range extends battery life in portable instrumentation and wearables |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Power management in handheld medical devices with dual Li-ion cell and regulated 1.8V core supply. IC Role / Device Role / Timing Role: Supervises main rail (VCC) and core rail (via RESET IN) to prevent firmware corruption during battery sag. Use Value: 140ms reset hold guarantees safe µP initialization even under fast-discharge conditions. |
Use Scenario: Industrial PLC module requiring fail-safe restart after power interruption or software hang. IC Role / Device Role / Timing Role: Provides hardware-enforced reset triggered by VCC dropout, MR button, or WDI timeout. Use Value: Push-pull RESET directly drives µP reset pin without external components, reducing BOM count and layout area. |
| Intelligent Instruments | Automotive Systems |
Use Scenario: Precision sensor node with 1.8V analog front-end and 3.3V digital domain powered from single buck converter. IC Role / Device Role / Timing Role: Monitors VCC and uses RESET IN to track scaled-down analog supply via resistor divider. Use Value: 0.63V internal threshold allows accurate sub-1V monitoring with <1% error using standard 1% resistors. |
Use Scenario: Body control module with cold-cranking immunity requirements and dual 5V/3.3V domains. IC Role / Device Role / Timing Role: Detects VCC undervoltage during engine start and asserts reset until stable operation resumes. Use Value: Guaranteed reset validity down to VCC = +1.0V ensures deterministic behavior during cranking transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6827WUT | Active-high push-pull RESET output instead of active-low; identical VCC/RESET IN thresholds and timing | Requires µP with active-high reset input; incompatible with standard active-low reset architectures without level-shifting | Select MAX6827WUT only when interfacing to µPs specifying active-high reset assertion. |
| TPS3808G16DBVR | Single-supply supervisor (monitors only VCC); 1.6V threshold, 200ms timeout; open-drain RESET; no RESET IN or WDI | Lacks dual-monitoring capability and watchdog functionality; requires external pullup and separate manual reset circuit | Choose TPS3808G16DBVR only for cost-sensitive, single-rail applications where watchdog and auxiliary monitoring are unnecessary. |
Compared with MAX6826WUT, MAX6827WUT offers identical supervision accuracy but inverted reset polarity, while TPS3808G16DBVR reduces feature set to lower cost and complexity at the expense of dual-rail monitoring and integrated watchdog - making MAX6826WUT optimal for compact, multivoltage systems needing autonomous fault recovery.
Availability
MAX6826WUT is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, and intelligent instruments requiring stable component supply across automotive (-40°C to +125°C) temperature grades.
Supply support for MAX6826WUT 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 computing applications.
The MAX6826–MAX6831 family was engineered specifically for ultra-low-voltage dual-supply monitoring in space-constrained, battery-operated systems - delivering integrated reset, manual reset, and watchdog functions in a 6-pin SOT23 package.
FAQ
What is the exact VCC reset threshold voltage for MAX6826WUT?
The MAX6826WUT has a factory-trimmed VCC reset threshold of 1.67V, with a tolerance of ±30mV 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 suffix W, and is confirmed across all production lots per Maxim's datasheet revision 2 (12/2005).
Does MAX6826WUT support monitoring a secondary voltage below 1.0V?
Yes, MAX6826WUT supports sub-1V monitoring via its RESET IN pin, which features a fixed 0.63V typical threshold. By connecting an external resistor divider between the target rail and GND, users can scale higher voltages down to this threshold - enabling accurate monitoring of core supplies such as 0.9V or 0.8V domains without additional components.
What is the function of Pin 5 (RESET IN) on MAX6826WUT?
Pin 5 on MAX6826WUT is the RESET IN input - a high-impedance comparator node with a 0.63V internal reference. It allows user-defined monitoring of a second voltage rail (e.g., a processor core supply) by connecting a resistor divider. When the divided voltage falls below 0.63V, the device asserts RESET, providing independent supervision beyond the primary VCC rail.
Can MAX6826WUT operate with VCC as low as 1.0V?
Yes, MAX6826WUT is guaranteed to maintain valid reset output behavior down to VCC = +1.0V, as explicitly stated in the General Description and Absolute Maximum Ratings sections. This ensures deterministic reset assertion during deep brownout events, a key requirement for data integrity in backup-power and energy-harvesting applications.
Is the watchdog timer in MAX6826WUT enabled by default?
No, the watchdog timer in MAX6826WUT is disabled by default when WDI (Pin 4) is left unconnected or driven by a three-stated buffer. The internal watchdog driver cycles low-high-low every ~1.4s when floating, preventing timeout. To enable it, WDI must be actively toggled by the host µP within each 1.6s window - a deliberate design to avoid unintended resets in systems not requiring watchdog supervision.
MAX6826WUT 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 FAQ
1.How can I place an order for MAX6826WUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6826WUT 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 reliable?
The price and inventory of MAX6826WUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6826WUT is usually 5 days.
3.What payment methods are accepted for MAX6826WUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6826WUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6826WUT?
MAX6826WUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6826WUT 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?
For technical support, including MAX6826WUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6826WUT requirements.
6.How does Aetrix verify that MAX6826WUT is sourced from the original manufacturer or authorized distributors?
All MAX6826WUT 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 meets industry standards.
7.What is the process for return or replacement of MAX6826WUT?
All MAX6826WUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX6826WUT, 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 part is unused and in its original packaging.
Return procedure for MAX6826WUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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