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Analog Devices Inc./Maxim Integrated MAX6826VUT+
- Part No.:
- MAX6826VUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6826VUT+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,402
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Product details
Overview
MAX6826VUT+ from Maxim Integrated is a dual ultra-low-voltage microprocessor supervisory IC in 6-pin SOT23 package, monitoring primary VCC (1.53V–2.0V range) and user-adjustable secondary voltage down to 0.63V, with 140ms min reset timeout, manual reset input, and 1.6s watchdog timer-used in battery-powered embedded controllers requiring reliable brownout detection and system recovery.
For engineers reviewing the MAX6826VUT+ datasheet, MAX6826VUT+ pinout, MAX6826VUT+ application, or MAX6826VUT+ equivalent, this page delivers verified electrical parameters, exact pin functions, real-world use scenarios for portable equipment and multivoltage systems, and two confirmed alternative parts with documented functional differences.
Technical Context
The MAX6826VUT+ integrates dual-supply monitoring with independent threshold comparators: one factory-trimmed for VCC (1.58V nominal at -40°C to +125°C), and one high-impedance RESET IN input with 0.63V internal reference enabling external resistor-divider configuration for secondary supply monitoring down to 0.63V. It asserts active-low push-pull RESET upon VCC drop, MR assertion, or watchdog timeout.
Its watchdog circuit clears on any WDI edge (min 50ns pulse width), times out after 1.6s nominal 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 below threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | +1.53V to +2.0V - supports low-power core supplies in modern microcontrollers and SoCs. |
| VCC Reset Threshold | 1.52V (min) / 1.58V (typ) / 1.62V (max) at -40°C to +125°C - precise brownout detection for 1.6V–1.8V rail systems. |
| RESET IN Threshold | 0.610V (min) / 0.630V (typ) / 0.650V (max) - enables accurate monitoring of auxiliary rails as low as 0.63V via external divider. |
| Reset Timeout Period | 140ms (min) - ensures sufficient hold time for full µP initialization and peripheral stabilization. |
| Watchdog Timeout | 1.12s (min) / 1.6s (typ) / 2.4s (max) - provides robust software execution supervision without excessive false triggers. |
| Supply Current (ICC) | 25µA max at -40°C to +125°C, VCC = +1.8V - ultra-low quiescent current critical for battery longevity. |
| RESET Output Type | Active-low push-pull - drives µP reset pin directly without external pull-up; sinks 50µA @ VCC ≥ 1.0V. |
Pinout & Package
Package: 6-pin SOT23 (U6+1 outline, land pattern 90-0175), RoHS-compliant, -40°C to +125°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; asserts low during VCC undervoltage, MR low, or watchdog timeout; holds for ≥140ms post-recovery. |
| 2 | GND | Ground reference for all internal comparators, timers, and output drivers. |
| 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 resets internal timer; left floating disables watchdog; accepts CMOS-level signals. |
| 5 | RESET IN | User-adjustable monitor input; high-impedance node referenced to 0.63V; connects to resistor divider for secondary rail monitoring. |
| 6 | VCC | Primary supply input; powers internal circuitry and sets operating range (+1.53V to +2.0V); monitored for reset generation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent monitoring | Simultaneously supervises primary VCC (1.53V–2.0V) and user-configurable secondary rail via RESET IN pin. |
| Guaranteed operation to 1.0V | Valid RESET output asserted even as VCC drops to +1.0V - ensures fail-safe behavior during deep brownout. |
| No external components required | Internal pullup on MR, precision bandgap references, and integrated watchdog eliminate need for discrete timing or biasing parts. |
| Immunity to short VCC glitches | Withstands ≤20µs negative transients up to 100mV below threshold - avoids spurious resets in noisy power environments. |
| Low-power watchdog supervision | 1.6s timeout with <160µA max WDI current when driven high - balances supervision reliability and battery drain. |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Wearable health monitors powered by single-cell Li-ion (3.0V–4.2V) with 1.8V MCU core and 1.2V sensor rail. IC Role / Device Role: MAX6826VUT+ monitors 1.8V core (VCC) and 1.2V sensor rail (via RESET IN divider), asserting reset if either sags during RF transmission bursts. Use Value: Prevents firmware crash from undervoltage-induced memory corruption while consuming only 25µA - extends battery life >20% vs. discrete supervisor solutions. |
Use Scenario: Industrial PLC I/O module with dual 3.3V/2.5V supplies and ARM Cortex-M4 MCU requiring deterministic boot sequence. IC Role / Device Role: MAX6826VUT+ supervises 1.8V logic supply (VCC) and 1.2V analog reference (via RESET IN), coordinating reset with watchdog-triggered firmware recovery. Use Value: Ensures synchronized power-on reset across digital and analog subsystems, eliminating race conditions during cold start. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Handheld multimeter with segmented LCD, 1.5V coin-cell backup, and 3.3V main supply powering ADC and display controller. IC Role / Device Role: MAX6826VUT+ monitors 1.8V main logic rail (VCC) and 1.5V backup rail (via RESET IN), triggering reset before LCD ghosting or ADC offset drift occurs. Use Value: Maintains measurement accuracy by preventing operation below specified supply margins - meets IEC 61000-4-2 immunity requirements. |
Use Scenario: Medical infusion pump MCU controlling motor drivers and pressure sensors, where reset failure could cause overdose. IC Role / Device Role: MAX6826VUT+ provides redundant VCC supervision (1.8V core) plus watchdog supervision of safety-critical firmware loops. Use Value: Guarantees reset assertion down to VCC = +1.0V and detects software hangs via 1.6s watchdog - satisfies ISO 13485 functional safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6827VUT+ | Same VCC range (1.53V–2.0V) and RESET IN capability, but features active-high push-pull RESET output instead of active-low. | Requires inverted reset logic on µP side; incompatible with standard active-low reset pins without level-shifting. | Select MAX6827VUT+ only when target MCU requires active-high reset assertion and board layout allows signal inversion. |
| TPS3808G15DBVR | Single-supply supervisor (1.5V–6.5V), no RESET IN pin; 200ms fixed reset timeout; no integrated watchdog; 1.8µA typical ICC. | Lacks dual-monitoring and watchdog functionality; suitable only for basic VCC-only supervision with ultra-low ICC priority. | Choose TPS3808G15DBVR for cost-sensitive, single-rail applications where watchdog and secondary rail monitoring are unnecessary. |
Compared with MAX6826VUT+, MAX6827VUT+ offers identical monitoring capability but inverted reset polarity, limiting direct substitution; TPS3808G15DBVR reduces complexity and current draw but sacrifices dual-supply supervision and watchdog - making it viable only for simplified, single-rail designs.
Availability
MAX6826VUT+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, intelligent instruments, and critical µP monitoring requiring stable component supply across industrial temperature ranges.
Supply support for MAX6826VUT+ 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, medical, and communications applications.
The MAX6826–MAX6831 family was engineered specifically for ultra-low-voltage dual-supply supervision in space-constrained, battery-operated systems - emphasizing guaranteed operation down to 1.0V, minimal external components, and integrated watchdog reliability.
FAQ
What is the exact VCC reset threshold voltage for MAX6826VUT+ over temperature?
The MAX6826VUT+ has a factory-trimmed VCC reset threshold of 1.52V (min), 1.58V (typ), and 1.62V (max) across -40°C to +125°C. This corresponds to the "V" suffix in the Threshold Suffix Guide and is guaranteed over full temperature range - critical for stable operation in automotive or industrial environments where supply rails fluctuate.
Can MAX6826VUT+ monitor a 1.2V secondary supply, and how is it configured?
Yes, MAX6826VUT+ can monitor a 1.2V secondary supply using its RESET IN pin. Connect a resistor divider between the 1.2V rail and GND such that the voltage at RESET IN equals 0.63V (its internal threshold). For example, R1 = 909kΩ and R2 = 1MΩ yields ~0.63V at RESET IN when VMONITOR = 1.2V - enabling precise, adjustable secondary rail supervision without additional ICs.
Does MAX6826VUT+ require external pull-up resistors on its RESET output?
No, MAX6826VUT+ does not require an external pull-up resistor on its RESET output because it uses an active-low push-pull driver. The output actively drives low during reset and high (at ≥0.8×VCC) when inactive - eliminating external components and ensuring fast, rail-to-rail reset signaling compatible with standard µP reset inputs.
How is the watchdog function disabled on MAX6826VUT+?
The watchdog function on MAX6826VUT+ is disabled by leaving the WDI pin unconnected. Internally, the WDI is driven low for 7/8 of the timeout period and high for 1/8; when floating, this self-clocking action resets the timer every ~1.4s, preventing timeout. No external tie-off or configuration is needed - simplifying design for applications not requiring watchdog supervision.
What is the minimum VCC voltage at which MAX6826VUT+ guarantees valid RESET output behavior?
MAX6826VUT+ guarantees valid RESET output behavior down to VCC = +1.0V. Below this, the internal comparators and drivers may become indeterminate. This specification ensures reliable brownout detection and reset assertion even during severe power droop - a key differentiator versus supervisors rated only to 1.2V or higher.
MAX6826VUT+ 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:
- 1.58V, 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
MAX6826VUT+ FAQ
1.How can I place an order for MAX6826VUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6826VUT+ 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 MAX6826VUT+ reliable?
The price and inventory of MAX6826VUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6826VUT+ is usually 5 days.
3.What payment methods are accepted for MAX6826VUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6826VUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6826VUT+?
MAX6826VUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6826VUT+ 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 MAX6826VUT+?
For technical support, including MAX6826VUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6826VUT+ requirements.
6.How does Aetrix verify that MAX6826VUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6826VUT+ 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 MAX6826VUT+ meets industry standards.
7.What is the process for return or replacement of MAX6826VUT+?
All MAX6826VUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6826VUT+, 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 MAX6826VUT+ part is unused and in its original packaging.
Return procedure for MAX6826VUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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