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Analog Devices Inc./Maxim Integrated MAX6826TUT+
- Part No.:
- MAX6826TUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6826TUT+.pdf
- Description:
- POWER SUPPLY MANAGEMENT CIRCUIT,
- Quantity:
- Payment:
- Shipping:
Inventory:1,604
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Product details
Overview
MAX6826TUT+ from Maxim Integrated is a dual ultra-low-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring primary VCC (1.8V–5.0V) and user-adjustable secondary voltage via RESET IN pin (typical threshold 0.63V), with 140ms min reset timeout, manual reset input (MR), and watchdog timer (1.6s nominal). It ensures reliable µP reset during power-up, brownout, and software hang conditions in portable and automotive systems.
For engineers reviewing the MAX6826TUT+ datasheet, MAX6826TUT+ pinout, MAX6826TUT+ application, or MAX6826TUT+ equivalent, this page delivers verified electrical parameters, SOT23-6 terminal mapping, real-world use scenarios for multivoltage embedded systems, and two validated alternative parts with documented functional differences.
Technical Context
The MAX6826TUT+ integrates dual-supply monitoring with independent comparators for VCC and RESET IN inputs, an internal 140ms reset timeout delay generator, and a 1.6s watchdog timer cleared by WDI edges or reset assertion. Its push-pull active-low RESET output remains asserted until all monitored voltages exceed thresholds and the timeout elapses.
It features a 50kΩ internal MR pullup, high-impedance RESET IN input (0.63V threshold), immunity to negative VCC transients ≤20µs at 100mV overdrive, and guaranteed operation down to VCC = +1.0V - enabling robust reset signaling even during deep brownout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | +1.2V to +5.5V - supports wide primary supply range including 1.8V, 2.5V, 3.3V, and 5V rails. |
| VCC Reset Threshold (T version) | +3.08V (min +2.97V, max +3.17V) - factory-trimmed for 3.3V systems with ±1.5% tolerance over -40°C to +125°C. |
| RESET IN Threshold | +0.63V (typ), +0.61V to +0.65V - enables precise user-adjustable monitoring of sub-1V supplies via external resistor divider. |
| Reset Timeout Period | 140ms (min), up to 320ms - ensures µP completes full initialization before release from reset state. |
| Watchdog Timeout | 1.6s (nominal), 0.80s to 2.60s - provides sufficient margin for firmware execution loops without false triggers. |
| Supply Current (ICC) | 30µA (max at -40°C to +125°C, VCC = +3.6V) - ultra-low quiescent current ideal for battery-powered devices. |
| RESET Output Type | Push-pull active-low - drives low with <0.4V @ 3.2mA sink, eliminating need for external pullup in most applications. |
Pinout & Package
Package: 6-pin SOT23-6, surface-mount, lead-free (RoHS-compliant), footprint compatible with JEDEC MO-178AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; asserts low on VCC drop, MR low, or watchdog timeout; holds for 140ms min after recovery. |
| 2 | GND | Ground reference for all internal comparators, timers, and output driver. |
| 3 | MR | Manual reset input (active-low); internally pulled up to VCC with 50kΩ; 1µs minimum pulse width accepted. |
| 4 | WDI | Watchdog input; toggling within 1.6s prevents reset; glitch rejection ≥100ns; disables if left floating or three-stated. |
| 5 | RESET IN | User-adjustable monitor input; high-impedance comparator input with 0.63V threshold; connects to resistor divider for custom VMONITOR. |
| 6 | VCC | Primary supply input; powers internal circuitry and sets RESET IN reference; valid operation guaranteed down to +1.0V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises VCC (1.8V–5.0V) and user-defined secondary rail via RESET IN - eliminates need for discrete comparators in multivoltage SoC designs. |
| Factory-trimmed VCC threshold | T-suffix guarantees +3.08V reset point (±1.5%) across -40°C to +125°C - removes calibration burden in 3.3V industrial control applications. |
| No external components required | Integrates pullup on MR, precision references, timeout generators, and watchdog logic - reduces BOM count and PCB area vs. discrete solutions. |
| Brownout immunity | Valid reset assertion down to VCC = +1.0V and immunity to ≤20µs negative VCC transients - prevents spurious resets in noisy automotive environments. |
| Low-power watchdog operation | WDI leakage <±100nA and configurable drive scheme - enables <1µA average system current when watchdog is actively serviced. |
Applications
| Portable Power Management | Automotive Body Control Module |
|---|---|
|
Use Scenario: Battery-powered handheld medical device with 3.3V main rail and 1.2V sensor interface. IC Role / Device Role / Timing Role: Primary supervisor asserting active-low reset to ARM Cortex-M0 MCU during Li-ion battery sag below 3.0V; RESET IN monitors 1.2V rail via R-divider. Use Value: Prevents corrupted EEPROM writes during brownout using guaranteed 140ms reset hold time and VCC = +1.0V operational floor. |
Use Scenario: Dashboard cluster MCU powered by 5V DC-DC and 2.5V display driver supply. IC Role / Device Role / Timing Role: Dual-rail supervision with VCC = 5V and RESET IN configured for 2.5V; MR tied to service button; WDI fed by periodic CAN message interrupt. Use Value: Ensures deterministic restart after ESD-induced latch-up via 1.6s watchdog timeout and noise-immune MR input with 100ns glitch rejection. |
| Industrial PLC I/O Module | Smart Energy Meter |
|
Use Scenario: DIN-rail mounted controller with isolated 24V-to-3.3V primary supply and 1.8V FPGA core rail. IC Role / Device Role / Timing Role: Monitors 3.3V VCC and uses RESET IN to supervise 1.8V FPGA supply; open-drain option not used - MAX6826TUT+ selected for push-pull simplicity. Use Value: Eliminates external pullup resistor and reduces layout complexity while maintaining <0.4V RESET low-level under 3.2mA load per IEC 61000-4-2 testing. |
Use Scenario: Revenue-grade meter with 3.3V MCU, 1.2V RTC backup, and tamper-detection circuitry. IC Role / Device Role / Timing Role: VCC = 3.3V monitored directly; RESET IN set to 1.2V via divider for RTC supervision; MR connected to optical tamper switch. Use Value: Guarantees valid reset signal during mains dropout (down to VCC = +1.0V) and enables tamper-triggered secure erase via MR assertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UTR+ | Single-supply supervisor (VCC only); no RESET IN or watchdog; 1.6V reset threshold; SOT23-5 package. | Lacks dual-monitoring and watchdog - suitable only for basic power-on reset in cost-sensitive single-rail designs. | Select MAX6326UTR+ only if secondary rail monitoring and software hang detection are unnecessary. |
| TPS3808G33DBVR | Single VCC supervisor with adjustable watchdog (0.5s–10s); fixed 3.3V reset; open-drain RESET; SOT23-6. | Offers programmable watchdog but no user-adjustable second voltage monitor - requires external circuitry for dual-rail supervision. | Choose TPS3808G33DBVR when fine-grained watchdog timing control is critical and secondary rail monitoring is handled externally. |
Compared with MAX6826TUT+, MAX6326UTR+ reduces functionality (no watchdog, no RESET IN) and pin count (5-pin), while TPS3808G33DBVR trades dual-supply flexibility for wider watchdog configurability - making MAX6826TUT+ uniquely suited for compact, self-contained dual-rail reset management.
Availability
MAX6826TUT+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, automotive systems, and industrial embedded controllers requiring stable component supply across extended temperature ranges (-40°C to +125°C).
Supply support for MAX6826TUT+ 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 space-constrained, multivoltage embedded systems needing simultaneous primary/secondary supply supervision, manual reset, and watchdog functionality in a 6-pin SOT23 package.
FAQ
What is the exact reset threshold voltage for MAX6826TUT+?
The MAX6826TUT+ has a factory-trimmed VCC reset threshold of +3.08V, with a guaranteed range of +2.97V to +3.17V over the full -40°C to +125°C operating temperature range. This T-suffix variant is optimized for 3.3V supply monitoring and does not require external resistor programming.
Does MAX6826TUT+ support monitoring a 1.2V secondary supply?
Yes, MAX6826TUT+ supports monitoring a 1.2V secondary supply using its RESET IN pin. With a typical internal threshold of +0.63V, a simple resistor divider (e.g., R1 = 100kΩ, R2 = 110kΩ) scales 1.2V down to ~0.63V at the pin, enabling accurate supervision without additional ICs.
What is the function of the WDI pin on MAX6826TUT+?
The WDI (Watchdog Input) pin on MAX6826TUT+ monitors µP activity: if no rising or falling edge occurs within 1.6s (nominal), it triggers a reset pulse for 140ms. The internal timer clears on any WDI transition, MR assertion, or RESET activation - providing fail-safe recovery from software lockups.
Can MAX6826TUT+ operate reliably when VCC drops to 1.1V?
Yes, MAX6826TUT+ is guaranteed to assert a valid reset signal down to VCC = +1.0V. At 1.1V, its internal comparators, timer, and push-pull RESET output remain fully functional - ensuring deterministic reset behavior during severe brownout conditions common in automotive and battery-edge applications.
Is the RESET output of MAX6826TUT+ compatible with bidirectional µP reset pins?
No - MAX6826TUT+ features a push-pull active-low RESET output, not open-drain. For µPs with bidirectional reset I/O (e.g., Motorola 68HC11), use MAX6828TUT+ or MAX6831TUT+ instead. MAX6826TUT+ requires a unidirectional reset input and may conflict with µPs that drive the reset line high during normal operation.
MAX6826TUT+ 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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 3.08V, 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
MAX6826TUT+ FAQ
1.How can I place an order for MAX6826TUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6826TUT+ 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 MAX6826TUT+ reliable?
The price and inventory of MAX6826TUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6826TUT+ is usually 5 days.
3.What payment methods are accepted for MAX6826TUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6826TUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6826TUT+?
MAX6826TUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6826TUT+ 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 MAX6826TUT+?
For technical support, including MAX6826TUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6826TUT+ requirements.
6.How does Aetrix verify that MAX6826TUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6826TUT+ 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 MAX6826TUT+ meets industry standards.
7.What is the process for return or replacement of MAX6826TUT+?
All MAX6826TUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6826TUT+, 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 MAX6826TUT+ part is unused and in its original packaging.
Return procedure for MAX6826TUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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