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Analog Devices Inc./Maxim Integrated MAX6826VUT+T
- Part No.:
- MAX6826VUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6826VUT+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,508
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Product details
Overview
MAX6826VUT+T 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 (MR), and 1.6s watchdog timer. It ensures reliable µP reset during power-up, brownout, or software hang in portable battery-powered systems.
For engineers reviewing the MAX6826VUT+T datasheet, MAX6826VUT+T pinout, MAX6826VUT+T application, or MAX6826VUT+T equivalent, this page delivers verified circuit role, exact threshold values (VTH = 1.575V typ at VCC), reset output type (push-pull active-low), watchdog timing behavior, and real-world design implications for multivoltage embedded controllers.
Technical Context
The MAX6826VUT+T implements dual-supply supervision with independent comparators: one factory-trimmed for VCC (1.53V–2.0V range, VTH = 1.575V typ), and one high-impedance RESET IN input with 0.63V internal reference enabling user-defined secondary voltage monitoring via resistor divider. Its push-pull RESET output asserts low during fault conditions and remains asserted for ≥140ms after recovery.
It integrates a 1.6s watchdog timer cleared by WDI edge transitions, an internal 50kΩ MR pullup, and immunity to negative VCC transients ≤20µs at 100mV overdrive. Guaranteed operation down to VCC = +1.0V ensures reset validity across full supply collapse scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 1.575V typical, ±0.05V over -40°C to +125°C - sets primary supply brownout detection point for 1.53V–2.0V systems |
| RESET IN Threshold | 0.630V typical, ±0.015V - enables precise secondary voltage monitoring (e.g., core rail) using external resistor divider |
| Reset Timeout Period | 140ms minimum - ensures µP completes power stabilization before release, preventing premature boot |
| Watchdog Timeout | 1.6s nominal, 0.8s–2.6s over temperature - provides robust software execution monitoring without excessive timeout latency |
| VCC Supply Current | 25µA max at -40°C to +125°C, VCC = +1.8V - supports ultra-low-power battery operation with negligible quiescent drain |
| RESET Output Type | Active-low push-pull - drives reset line directly without external pullup, compatible with standard µP reset inputs |
| Operating Temperature | -40°C to +125°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
Package: 6-pin SOT23 (U6+1 outline, land pattern 90-0175), RoHS-compliant lead-free (indicated by "+T" suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; asserts low on VCC/VCC2/RESET IN fault, MR low, or watchdog timeout |
| 2 | GND | Ground reference for all internal comparators, timers, and I/O |
| 3 | MR | Manual reset input (active-low); internal 50kΩ pullup to VCC - connect to GND via momentary switch for hardware reset |
| 4 | WDI | Watchdog input; toggling within 1.6s clears internal timer - left unconnected disables watchdog function |
| 5 | RESET IN | User-adjustable monitor input; compares external voltage (via resistor divider) against 0.63V internal reference |
| 6 | VCC | Primary supply input; powers device and sets VCC threshold (1.53V–2.0V range for "V" suffix) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises primary VCC (1.53V–2.0V) and user-defined secondary rail (down to 0.63V reference) - eliminates need for discrete comparators in multivoltage SoC designs |
| Guaranteed reset validity to VCC = +1.0V | Ensures RESET output remains functional even during deep brownout - critical for fail-safe shutdown in battery-depleted portable equipment |
| No external components required | Integrates precision voltage references, timer, pullup resistors, and comparator hysteresis - reduces BOM count and PCB area vs. discrete solutions |
| Immunity to short VCC transients | Rejects negative glitches ≤20µs at 100mV overdrive - prevents spurious resets in electrically noisy industrial environments |
| 1.6s watchdog with edge-triggered clear | Timer resets only on rising/falling edges at WDI - avoids false clears from stuck logic states and enables robust software hang detection |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
|
Use Scenario: Smart sensor node powered by single Li-ion cell (2.8V–4.2V), with 1.8V MCU core and 3.3V I/O rail. IC Role / Device Role: Primary supervisor for VCC (1.8V rail), secondary monitor for 3.3V I/O via RESET IN divider; asserts reset if either rail drops below threshold. Use Value: Prevents MCU corruption during battery sag or cold-temperature discharge, extending field reliability without adding discrete components. |
Use Scenario: Industrial PLC controller with dual 3.3V and 1.2V supplies, requiring deterministic boot sequence after power interruption. IC Role / Device Role: Monitors 3.3V main supply (VCC) and 1.2V core rail (via RESET IN), enforces 140ms reset hold time to ensure FPGA configuration completion. Use Value: Guarantees synchronized reset release across heterogeneous voltage domains, eliminating race conditions in complex embedded boot flows. |
| Intelligent Instruments | Critical µP Monitoring |
|
Use Scenario: Handheld multimeter with segmented LCD, 1.5V analog front-end, and 3.0V digital subsystem. IC Role / Device Role: Uses VCC = 3.0V (S-suffix) to supervise digital rail, RESET IN to monitor 1.5V analog supply - triggers reset if analog rail collapses first. Use Value: Maintains measurement integrity by halting digital processing before analog reference failure corrupts ADC readings. |
Use Scenario: Medical infusion pump MCU requiring fail-safe restart upon software lockup or power anomaly. IC Role / Device Role: Combines VCC supervision (2.5V rail), manual reset (for service mode), and 1.6s watchdog - forces hard reset if firmware fails to toggle WDI. Use Value: Meets IEC 62304 safety requirements by providing hardware-enforced recovery path independent of software state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6827VUT+T | Active-high push-pull RESET output (vs. MAX6826VUT+T's active-low); identical VCC threshold (1.575V) and RESET IN capability | Required when interfacing with µPs that assert reset on high (e.g., certain ARM Cortex-M variants with configurable reset polarity) | Select MAX6827VUT+T only if system-level reset logic requires active-high assertion; otherwise MAX6826VUT+T maintains compatibility with standard active-low µP inputs. |
| TPS3808G15DBVR | Single-supply supervisor (monitors only VDD), 1.5V threshold, 200ms reset timeout, no RESET IN or watchdog; SOT23-6 package | Lacks dual-monitoring, adjustable secondary rail, and watchdog - suitable only for basic single-rail systems without software hang protection | Choose TPS3808G15DBVR only for cost-sensitive, single-rail applications where watchdog and secondary rail monitoring are unnecessary. |
Compared with MAX6826VUT+T, MAX6827VUT+T offers identical supervision accuracy but inverted reset polarity, while TPS3808G15DBVR sacrifices dual monitoring and watchdog functionality for lower unit cost and simpler integration in single-supply designs.
Availability
MAX6826VUT+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, and intelligent instruments requiring stable component supply with guaranteed industrial temperature operation (-40°C to +125°C) and RoHS-compliant packaging.
Supply support for MAX6826VUT+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, medical, and communications applications.
The MAX6826–MAX6831 family targets ultra-low-voltage microprocessor supervision in space-constrained, multirail systems - delivering dual monitoring, watchdog, and manual reset in a 6-pin SOT23 footprint.
FAQ
What is the exact VCC reset threshold voltage for MAX6826VUT+T?
The MAX6826VUT+T has a factory-trimmed VCC reset threshold of 1.575V typical, with guaranteed range of 1.521V to 1.629V over -40°C to +125°C. This value corresponds to the "V" suffix in the ordering code and is optimized for primary supply monitoring in 1.53V–2.0V systems. The threshold exhibits 60ppm/°C temperature coefficient and 2×VTH hysteresis.
Does MAX6826VUT+T support monitoring a secondary voltage below 1.0V?
Yes, MAX6826VUT+T supports monitoring secondary voltages down to 0.63V via its RESET IN pin, which features an internal 0.630V reference comparator. By connecting an external resistor divider between the target rail and GND, designers can scale higher voltages to match this reference - enabling supervision of sub-1V core rails like 0.9V or 0.8V SoC supplies.
What is the reset output configuration of MAX6826VUT+T?
MAX6826VUT+T features an active-low push-pull RESET output. When asserted, it drives the output low with VOL ≤ 0.3V at ISINK = 100µA (VCC ≥ 1.2V); when deasserted, it drives high with VOH ≥ 0.8×VCC at ISOURCE = 1µA. This eliminates need for external pullup resistors and ensures direct compatibility with standard µP reset inputs requiring active-low assertion.
How does the watchdog timer in MAX6826VUT+T operate?
The MAX6826VUT+T watchdog timer has a nominal timeout of 1.6s, with guaranteed range of 0.8s–2.6s over temperature. It clears on any rising or falling edge at the WDI pin and asserts reset if no edge occurs within the timeout window. Leaving WDI unconnected disables the watchdog, as internal circuitry generates periodic pulses that prevent timeout.
Is MAX6826VUT+T guaranteed to function at VCC = +1.0V?
Yes, MAX6826VUT+T is fully specified and guaranteed to operate correctly down to VCC = +1.0V, including valid RESET output assertion and deassertion. This ensures reliable brownout detection and reset generation even during severe supply collapse - a key requirement for battery-powered devices operating near end-of-life voltage thresholds.
MAX6826VUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX6826VUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6826VUT+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 MAX6826VUT+T reliable?
The price and inventory of MAX6826VUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6826VUT+T is usually 5 days.
3.What payment methods are accepted for MAX6826VUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6826VUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6826VUT+T?
MAX6826VUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6826VUT+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 MAX6826VUT+T?
For technical support, including MAX6826VUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6826VUT+T requirements.
6.How does Aetrix verify that MAX6826VUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6826VUT+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 MAX6826VUT+T meets industry standards.
7.What is the process for return or replacement of MAX6826VUT+T?
All MAX6826VUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6826VUT+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 MAX6826VUT+T part is unused and in its original packaging.
Return procedure for MAX6826VUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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