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Analog Devices Inc./Maxim Integrated MAX6826ZUT+
- Part No.:
- MAX6826ZUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6826ZUT+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,159
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Product details
Overview
MAX6826ZUT+ from Maxim Integrated is an ultra-low-voltage dual-supply microprocessor supervisory IC in 6-pin SOT23 package, monitoring primary VCC (2.25V–2.38V threshold) and user-adjustable secondary voltage down to 0.63V, with 140ms min reset timeout, manual reset input, and 1.6s watchdog timer - used in portable battery-powered equipment and multivoltage embedded systems.
For engineers reviewing the MAX6826ZUT+ datasheet, MAX6826ZUT+ pinout, MAX6826ZUT+ application, or MAX6826ZUT+ equivalent, this page delivers verified circuit role, exact reset thresholds, true watchdog timing, confirmed push-pull RESET output behavior, and real-world design implications for brownout immunity and µP reset integrity.
Technical Context
The MAX6826ZUT+ integrates two independent voltage monitors: a factory-trimmed VCC threshold (2.32V nominal at -40°C to +125°C) and a high-impedance RESET IN input with 0.63V internal reference, enabling external resistor-divider configuration for secondary supply monitoring down to 0.6V. It asserts active-low push-pull RESET when either monitored voltage falls below threshold, MR is pulled low, or WDI times out.
Its watchdog timer clears on any WDI edge (min pulse width 50ns), resets after 1.6s nominal timeout if unrefreshed, and remains disabled when WDI is left floating. Reset remains asserted for ≥140ms after all fault conditions clear, with guaranteed valid operation down to VCC = +1.0V and immunity to ≤20µs negative VCC transients at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.25V to 2.38V (min/max over -40°C to +125°C); sets primary supply brownout detection point for +2.1V to +2.75V VCC range |
| RESET IN Threshold | 0.630V typical; enables precise secondary voltage monitoring via external resistor divider, supporting down to 0.6V trip point |
| Reset Timeout Period | 140ms minimum; ensures µP remains held in reset long enough to stabilize after power recovery or manual trigger |
| Watchdog Timeout | 1.12s to 2.4s (min/max over -40°C to +85°C); provides configurable software execution supervision window |
| RESET Output Type | Active-low push-pull; drives low to 0.3V at 50µA sink, eliminating need for external pullup in most µP reset interfaces |
| Supply Current | 30µA max at -40°C to +125°C, VCC = +3.6V; enables ultra-low-power operation in battery-critical applications |
| Operating Temperature | -40°C to +125°C; qualified for industrial and automotive under-hood environments without derating |
Pinout & Package
Package: 6-pin SOT23 (U6+1 outline, land pattern 90-0175), RoHS-compliant, lead-free (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; asserts low during VCC/VCC2/RESET IN fault, MR low, or WDI timeout; holds for ≥140ms post-recovery |
| 2 | GND | Ground reference for all internal comparators, timers, and output drivers; must be low-impedance connection |
| 3 | MR | Manual reset input (active-low); internal 50kΩ pullup to VCC; 1µs min pulse width; 100ns glitch rejection |
| 4 | WDI | Watchdog input; toggling within 1.6s prevents reset; unconnected or three-stated disables watchdog function |
| 5 | RESET IN | User-adjustable monitor input; 0.63V internal reference; connects to resistor divider for secondary voltage monitoring |
| 6 | VCC | Primary supply input; powers internal circuitry and sets operating range (+2.1V to +2.75V for Z-suffix); reset valid down to +1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Factory-trimmed VCC threshold (2.32V) + user-configurable RESET IN (0.63V ref) supports simultaneous primary/secondary supply supervision |
| Guaranteed reset validity to VCC = +1.0V | Ensures reliable reset assertion even during deep brownout, preventing µP runaway before full power collapse |
| No external components required | Integrates pullup on MR, precision references, watchdog timer, and reset delay generator - eliminates BOM count and layout area |
| Immunity to short negative VCC transients | Tolerates ≤20µs glitches at 100mV below threshold without spurious reset, reducing false triggers in noisy power rails |
| 1.6s watchdog with edge-triggered clear | Resets timer on any WDI rising/falling edge (50ns min pulse), enabling robust software supervision without fixed-interval polling |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Power management in handheld medical devices with dual Li-ion cell and LDO-derived logic rails. IC Role / Device Role / Timing Role: Monitors main battery voltage (2.32V threshold) and core logic rail (via RESET IN divider) to assert reset before brownout-induced firmware corruption. Use Value: Prevents unsafe operation during battery depletion by holding µP in reset until both supplies exceed thresholds and stabilize for ≥140ms. |
Use Scenario: Industrial PLC module with separate I/O and CPU supply domains. IC Role / Device Role / Timing Role: Supervises 2.5V I/O rail (VCC) and 1.8V CPU rail (via RESET IN) while providing manual reset for field service and watchdog supervision of control loop execution. Use Value: Enables deterministic restart after power interruption or software hang, with no external timing components or calibration. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Portable oscilloscope with analog front-end, ADC, and ARM Cortex-M4 processor. IC Role / Device Role / Timing Role: Tracks 3.3V analog supply (VCC) and 1.2V digital core (via RESET IN) while using WDI to verify real-time signal processing firmware liveness. Use Value: Guarantees µP reset during analog supply sag or digital core undervoltage, with 1.6s watchdog catching infinite loops in acquisition routines. |
Use Scenario: Automotive body controller requiring ASIL-B–level power integrity assurance. IC Role / Device Role / Timing Role: Dual-monitoring of 5V system rail (VCC) and 3.3V MCU domain (via RESET IN), with MR for diagnostic reset and watchdog for firmware health check. Use Value: Meets functional safety requirements by asserting reset within 20µs of VCC drop >100mV and maintaining it ≥140ms for safe state entry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6827ZUT+ | Active-high push-pull RESET output; identical VCC threshold (2.32V), same pinout and timing | Required where host µP expects active-high reset assertion instead of active-low | Select MAX6827ZUT+ only when interfacing with µPs that require high-true reset signaling (e.g., certain Renesas SH-family) |
| MAX6828ZUT+ | Open-drain RESET output; identical VCC/RESET IN thresholds and timing; requires external pullup | Necessary for bidirectional µP reset pins (e.g., Motorola 68HC11) or wired-OR reset bus architectures | Choose MAX6828ZUT+ when shared reset bus or level translation to higher voltage domains is needed |
Compared with MAX6826ZUT+, MAX6827ZUT+ changes reset polarity but preserves all supervision logic and timing, while MAX6828ZUT+ trades push-pull drive for open-drain flexibility - neither offers pin-to-pin replacement without schematic modification due to output topology differences.
Availability
MAX6826ZUT+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, intelligent instruments, critical µP monitoring, and multivoltage systems requiring stable component supply across industrial temperature ranges.
Supply support for MAX6826ZUT+ 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 industrial, automotive, and computing applications.
The MAX6826–MAX6831 family was engineered specifically for dual-rail microprocessor supervision in space-constrained, low-power systems - delivering factory-trimmed and user-adjustable thresholds in miniature SOT23 packages without external components.
FAQ
What is the exact VCC reset threshold voltage for MAX6826ZUT+ over temperature?
The MAX6826ZUT+ has a VCC reset threshold of 2.25V (min), 2.32V (typ), and 2.38V (max) over the full -40°C to +125°C operating range. This threshold applies specifically to the Z-suffix variant and is factory-trimmed for the +2.1V to +2.75V VCC supply range. The device guarantees correct reset assertion down to VCC = +1.0V, ensuring reliability during deep brownout conditions.
Does MAX6826ZUT+ support monitoring a secondary voltage lower than 0.63V?
No, MAX6826ZUT+ does not support monitoring voltages below 0.63V. Its RESET IN pin uses an internal 0.63V reference comparator, and the datasheet specifies a minimum adjustable trip point of 0.6V using external resistors. Attempting to configure for sub-0.6V operation violates the guaranteed operating range and may result in undefined reset behavior or failure to assert reset reliably.
Is the watchdog timer in MAX6826ZUT+ enabled by default?
No, the watchdog timer in MAX6826ZUT+ is disabled by default when WDI is left unconnected or driven by a three-stated buffer. The internal driver toggles WDI low-high-low every ~1.4s to prevent timeout, effectively disabling supervision. To enable the watchdog, WDI must be actively driven by the µP with edges occurring at least once per 1.6s nominal timeout period.
Can MAX6826ZUT+ be used with a 1.8V primary supply?
No, MAX6826ZUT+ is not rated for 1.8V VCC operation. Its Z-suffix variant is specified for VCC = +2.1V to +2.75V. Using 1.8V violates the absolute minimum operating voltage and risks incorrect reset assertion, invalid watchdog timing, or complete functional failure. For 1.8V systems, consider the MAX6826WUT+ (1.62V–1.71V threshold) or MAX6826VUT+ (1.52V–1.62V threshold) variants.
What is the maximum allowable load capacitance on the RESET output of MAX6826ZUT+?
The MAX6826ZUT+ RESET output does not specify a maximum load capacitance limit in its datasheet because it uses a push-pull driver capable of sinking 50µA (0.3V max) and sourcing current per VOH specs. However, excessive capacitance (>1000pF) may degrade rise/fall times and cause timing violations in fast µP reset sampling windows. For reliable operation, keep RESET trace capacitance below 300pF and avoid long stubs or multiple loads without buffering.
MAX6826ZUT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.32V, 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-6
MAX6826ZUT+ FAQ
1.How can I place an order for MAX6826ZUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6826ZUT+ 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 MAX6826ZUT+ reliable?
The price and inventory of MAX6826ZUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6826ZUT+ is usually 5 days.
3.What payment methods are accepted for MAX6826ZUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6826ZUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6826ZUT+?
MAX6826ZUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6826ZUT+ 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 MAX6826ZUT+?
For technical support, including MAX6826ZUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6826ZUT+ requirements.
6.How does Aetrix verify that MAX6826ZUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6826ZUT+ 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 MAX6826ZUT+ meets industry standards.
7.What is the process for return or replacement of MAX6826ZUT+?
All MAX6826ZUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6826ZUT+, 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 MAX6826ZUT+ part is unused and in its original packaging.
Return procedure for MAX6826ZUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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