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Analog Devices Inc./Maxim Integrated MAX6826SUT+T
- Part No.:
- MAX6826SUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6826SUT+T.pdf
- Description:
- IC MPU SUPERVISOR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:339
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Product details
Overview
MAX6826SUT+T from Maxim Integrated is a dual ultra-low-voltage microprocessor supervisory IC in 6-pin SOT23 package, monitoring primary supply (VCC) at 2.85V–3.00V and secondary input (RESET IN) down to 0.63V, with 140ms min reset timeout, manual reset input (MR), and 1.6s watchdog timer - used in portable battery-powered equipment for reliable power-on reset and brownout protection.
For engineers reviewing the MAX6826SUT+T datasheet, MAX6826SUT+T pinout, MAX6826SUT+T application, or MAX6826SUT+T equivalent, this page delivers verified functional identity, exact threshold values, reset output type (push-pull active-low), watchdog behavior, and real-world design constraints including VCC-down-to-1.0V operation and immunity to short negative transients.
Technical Context
The MAX6826SUT+T implements dual-supply supervision using two independent comparators: one for factory-trimmed VCC threshold (S-suffix = 2.85V–3.00V) and another for user-adjustable RESET IN (typical 0.63V threshold). It integrates a 1.6s watchdog timer with edge-sensitive WDI input and a 140ms minimum reset timeout delay generator.
Its push-pull active-low RESET output drives high when deasserted (VOH ≥ 0.8×VCC) and low when asserted (VOL ≤ 0.3V at ISINK ≥ 50µA), with guaranteed valid reset assertion down to VCC = +1.0V. MR features internal 50kΩ pullup and 1µs minimum pulse width support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.85V–3.00V (S-suffix, -40°C to +85°C); enables precise monitoring of 3.0V or 2.85V system rails |
| RESET IN Threshold | 0.63V typical; allows user-defined secondary voltage monitoring via resistor divider |
| Reset Timeout Period | 140ms minimum; ensures µP completes power stabilization before release |
| Watchdog Timeout | 1.6s nominal; detects firmware hangs in embedded controllers without external timing components |
| Operating Voltage Range | +1.2V to +5.5V (–40°C to +125°C); supports ultra-low-voltage operation down to 1.2V VCC |
| RESET Output Type | Push-pull active-low; eliminates need for external pullup and interfaces directly with µP reset pins |
| Supply Current (ICC) | 7µA typical at +3.6V, –40°C to +85°C; enables multi-year battery life in portable instrumentation |
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 on VCC drop, MR low, or watchdog timeout |
| 2 | GND | Ground reference for all internal comparators and logic |
| 3 | MR | Manual-reset input (active-low); internal 50kΩ pullup to VCC; 1µs minimum pulse width |
| 4 | WDI | Watchdog input; toggling within 1.6s prevents reset; unconnected disables watchdog |
| 5 | RESET IN | User-adjustable monitor input; 0.63V internal threshold; connects to resistor divider for custom trip point |
| 6 | VCC | Primary supply input; powers device and sets VCC reset threshold (2.85V–3.00V for S-suffix) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent monitoring | Simultaneously supervises primary rail (VCC) and secondary rail (via RESET IN), eliminating need for two discrete supervisors |
| Factory-trimmed VCC threshold | S-suffix guarantees 2.85V–3.00V VCC reset window over full temperature range, reducing BOM count vs. adjustable solutions |
| Adjustable secondary monitor | 0.63V internal comparator reference enables monitoring of any voltage ≥0.63V using two external resistors |
| Guaranteed reset validity to VCC = +1.0V | Ensures deterministic reset assertion during deep brownout, critical for data integrity in battery-backed systems |
| No external components required | Integrates pullup on MR, watchdog timer, reset delay, and dual comparators - reduces PCB area and qualification effort |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Handheld medical meters powered by single Li-ion cell with 2.8V–4.2V discharge profile. IC Role / Device Role / Timing Role: Monitors main 3.0V LDO output (VCC) and analog sensor supply (via RESET IN) to prevent firmware execution during undervoltage. Use Value: 140ms reset hold ensures ADC calibration completes before µP boot; 0.63V RESET IN threshold enables monitoring of 1.8V sensor rail with 3:1 resistor divider. |
Use Scenario: Industrial PLC I/O module with isolated 3.3V logic and 2.5V FPGA core supply. IC Role / Device Role / Timing Role: Supervises 3.0V VCC rail (S-suffix) and FPGA core voltage (via RESET IN) while providing watchdog safety for firmware loops. Use Value: Push-pull RESET drives FPGA PROG_B pin directly; 1.6s watchdog timeout matches typical firmware task cycle time without software overhead. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Portable multimeter with dual supply: 3.0V display driver and 1.8V precision ADC reference. IC Role / Device Role / Timing Role: Uses VCC pin for 3.0V rail supervision and RESET IN for 1.8V rail (set via 1.1MΩ/1MΩ divider), asserting unified reset. Use Value: Single IC replaces two discrete supervisors; 140ms timeout exceeds ADC reference settling time; no external capacitors needed. |
Use Scenario: Automotive body control module requiring fail-safe reset under cold-crank (VCC dips to 1.2V). IC Role / Device Role / Timing Role: Provides guaranteed reset assertion down to VCC = +1.0V and rejects <20µs negative transients per datasheet graph. Use Value: Immunity to starter motor noise prevents spurious resets; push-pull output drives µP reset without external pullup, saving board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6827SUT+T | Active-high push-pull RESET output; identical VCC threshold (2.85V–3.00V), RESET IN, and watchdog specs | Required where µP reset pin is active-high (e.g., certain ARM Cortex-M variants) | Select MAX6827SUT+T only if system requires active-high reset assertion; otherwise MAX6826SUT+T provides direct compatibility with standard active-low µP inputs. |
| TPS3808G33DBVR | Single-supply supervisor (3.3V fixed threshold); no RESET IN input or watchdog; 200ms reset timeout; SOT23-6 package | Lacks dual-monitoring and watchdog functionality; suitable only for basic VCC-only supervision | Choose TPS3808G33DBVR only for cost-sensitive, single-rail applications without watchdog or secondary voltage monitoring requirements. |
Compared with MAX6827SUT+T, MAX6826SUT+T offers native active-low reset drive for broader µP compatibility; compared with TPS3808G33DBVR, it adds essential dual-rail supervision and watchdog safety at minimal footprint cost.
Availability
MAX6826SUT+T 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 range (–40°C to +125°C).
Supply support for MAX6826SUT+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, automotive, and computing applications.
The MAX6826–MAX6831 family was engineered for ultra-low-voltage dual-supply supervision in space-constrained, battery-operated systems - delivering integrated reset, watchdog, and adjustable monitoring in a 6-pin SOT23.
FAQ
What is the exact VCC reset threshold voltage range for MAX6826SUT+T?
The MAX6826SUT+T has an S-suffix, specifying a VCC reset threshold of 2.85V to 3.00V over –40°C to +85°C, and 2.83V to 3.02V over –40°C to +125°C. This is factory-trimmed and guaranteed - not adjustable. The threshold applies only to the VCC pin; RESET IN uses a separate 0.63V internal reference.
Does MAX6826SUT+T support monitoring a secondary voltage below 0.9V?
Yes. MAX6826SUT+T includes a dedicated RESET IN pin with a fixed 0.63V internal comparator threshold, enabling monitoring of voltages as low as ~0.63V using an external resistor divider. This differs from the MAX6829–MAX6831 series, which monitor VCC2 down to 0.9V but lack RESET IN.
Is the watchdog timer in MAX6826SUT+T enabled by default?
No. The watchdog timer in MAX6826SUT+T is disabled by default when the WDI pin is left unconnected or driven by a three-stated buffer. To enable it, the host µP must actively toggle WDI (rising or falling edge) at least once every 1.6s. Leaving WDI floating does not activate watchdog functionality.
What is the reset output configuration of MAX6826SUT+T?
MAX6826SUT+T features a push-pull active-low RESET output. When asserted, it drives low (≤0.3V at 50µA sink); when deasserted, it drives high (≥0.8×VCC at 200µA source). This eliminates the need for an external pullup resistor and ensures clean, fast transitions compatible with most µP reset inputs.
Can MAX6826SUT+T operate reliably when VCC drops below 1.8V?
Yes. MAX6826SUT+T is guaranteed to assert a valid reset down to VCC = +1.0V over the full –40°C to +125°C temperature range. Its internal circuitry remains functional and the RESET output maintains specified VOL/VOH levels even at 1.0V, making it suitable for deep brownout detection in Li-ion and coin-cell applications.
MAX6826SUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.93V, 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
MAX6826SUT+T FAQ
1.How can I place an order for MAX6826SUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6826SUT+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 MAX6826SUT+T reliable?
The price and inventory of MAX6826SUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6826SUT+T is usually 5 days.
3.What payment methods are accepted for MAX6826SUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6826SUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6826SUT+T?
MAX6826SUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6826SUT+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 MAX6826SUT+T?
For technical support, including MAX6826SUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6826SUT+T requirements.
6.How does Aetrix verify that MAX6826SUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6826SUT+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 MAX6826SUT+T meets industry standards.
7.What is the process for return or replacement of MAX6826SUT+T?
All MAX6826SUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6826SUT+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 MAX6826SUT+T part is unused and in its original packaging.
Return procedure for MAX6826SUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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