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Analog Devices Inc./Maxim Integrated MAX6828MUT-T
- Part No.:
- MAX6828MUT-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6828MUT-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:7,466
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Product details
Overview
MAX6828MUT-T from Maxim Integrated is an ultra-low-voltage dual microprocessor supervisory circuit in SOT23-6 package, designed to monitor primary supply (VCC) and user-adjustable secondary input (RESET IN) with open-drain active-low RESET output. It asserts reset if VCC falls below 3.08V (±3%), RESET IN drops below 0.63V (typ), or watchdog timer expires after 1.6s; reset remains asserted for ≥140ms. Used in battery-powered embedded controllers requiring reliable brownout and watchdog protection.
For engineers reviewing the MAX6828MUT-T datasheet, MAX6828MUT-T pinout, MAX6828MUT-T application, or MAX6828MUT-T equivalent, key selection criteria include its open-drain RESET output compatibility with bidirectional µP reset pins, guaranteed reset validity down to VCC = +1.0V, immunity to short negative VCC transients, and support for user-adjustable monitoring down to +0.63V on RESET IN.
Technical Context
The MAX6828MUT-T implements a dual-threshold supervision architecture: one factory-trimmed VCC threshold (3.08V nominal) and one high-impedance RESET IN comparator with 0.63V internal reference. Its open-drain RESET output enables wired-OR configuration and direct interface with bidirectional microcontroller reset I/O pins like Motorola 68HC11.
It integrates a 1.6s watchdog timer cleared by WDI edges or reset assertion, and a manual reset input (MR) with internal 50kΩ pullup. Reset timeout is fixed at ≥140ms and remains active after all monitored conditions recover, ensuring stable processor initialization during power transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 3.08V ±3% - factory-trimmed primary supply monitor, valid over -40°C to +125°C |
| RESET IN Threshold | 0.63V (typ), adjustable via external resistor divider - enables monitoring of voltages down to 0.6V |
| Reset Timeout | ≥140ms - ensures µP remains held in reset long enough for stable power rail recovery |
| Watchdog Timeout | 1.6s nominal - detects µP lockup; cleared by WDI edge or reset assertion |
| RESET Output Type | Open-drain active-low - supports wired-OR, level translation, and bidirectional µP reset I/O |
| Operating Voltage Range | +1.0V to +5.5V - guarantees functional reset assertion even during deep brownout |
| Supply Current | 30µA max at -40°C to +125°C - ultra-low quiescent current for battery-critical systems |
Pinout & Package
SOT23-6 package: 2.9mm × 1.6mm × 1.1mm body, gull-wing leads, RoHS-compliant lead-free option available (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain active-low reset output; requires external pullup for logic-high state |
| 2 | GND | Ground reference for all internal comparators and timing circuits |
| 3 | MR | Active-low manual reset input with internal 50kΩ pullup to VCC; debounced internally |
| 4 | WDI | Watchdog input; toggling within 1.6s prevents reset; unconnected disables watchdog |
| 5 | RESET IN | User-adjustable monitor input; high-impedance node referenced to 0.63V internal threshold |
| 6 | VCC | Primary supply input; powers device and sets VCC threshold at 3.08V |
Key Features
| Feature | Design Value |
|---|---|
| Open-drain RESET output | Enables direct connection to bidirectional µP reset pins without level-shifting or conflict risk |
| User-adjustable RESET IN | Supports precise monitoring of auxiliary rails (e.g., core voltage, sensor supply) via resistor divider |
| Guaranteed reset down to VCC = +1.0V | Ensures fail-safe reset assertion even during severe brownout before VCC collapses completely |
| No external components required | Integrates reference, comparators, timers, and pullup - eliminates BOM cost and layout area |
| Immunity to short negative VCC transients | Withstands ≤20µs glitches down to 100mV below threshold without spurious reset assertion |
Applications
| Portable Power Management | Automotive Body Control |
|---|---|
Use Scenario: Monitoring Li-ion battery voltage and system core rail in handheld medical devices during discharge cycles. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting open-drain RESET to hold ARM Cortex-M4 in known state until both VCC ≥3.08V and RESET IN ≥0.63V. Use Value: Prevents erratic firmware execution during battery sag; 140ms timeout ensures stable clock and memory initialization before boot. | Use Scenario: Supervising 3.3V MCU supply and 1.2V CAN transceiver bias rail in door module ECU. IC Role / Device Role / Timing Role: Primary VCC monitor (3.08V) and secondary RESET IN (0.63V) detect undervoltage on either rail; open-drain RESET interfaces directly with bidirectional STMicro STM32 reset pin. Use Value: Eliminates need for external level shifter; 1.6s watchdog catches firmware hangs during LIN communication faults. |
| Industrial Sensor Node | Smart Metering |
Use Scenario: Validating 2.5V analog front-end supply and 1.8V digital logic rail in wireless temperature sensor node. IC Role / Device Role / Timing Role: RESET IN pin configured via resistor divider to trip at 1.8V; VCC monitors 2.5V supply; MR tied to pushbutton for field calibration reset. Use Value: Single IC replaces two discrete supervisors; 30µA supply current extends 10-year battery life in NB-IoT deployments. | Use Scenario: Ensuring reliable startup and runtime supervision of 3.3V metering SoC and 1.2V RTC backup supply. IC Role / Device Role / Timing Role: VCC monitors main supply; RESET IN monitors RTC rail via 0.63V reference; watchdog guards against meter firmware corruption during power line surges. Use Value: Open-drain RESET allows shared reset bus across multiple subsystems; guaranteed operation down to VCC = +1.0V prevents false resets during AC dropout events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6827MUT-T | Push-pull active-high RESET output; identical VCC/RESET IN thresholds and timing | Requires level inversion or µP with active-high reset input; not compatible with bidirectional reset pins | Select when system design mandates active-high reset signaling and no wired-OR is needed |
| TPS3808G33DBVR | Fixed 3.3V VDD threshold; no user-adjustable secondary input; 200ms reset timeout; SOT23-6 | Lacks dual-rail flexibility; suitable only for single-supply monitoring where 3.3V accuracy suffices | Choose for cost-sensitive, single-rail applications where RESET IN adjustability is unnecessary |
Compared with MAX6827MUT-T, the MAX6828MUT-T provides essential open-drain flexibility for bidirectional µP interfaces; versus TPS3808G33DBVR, it delivers critical dual-threshold supervision and sub-1V reset validity-key for brownout resilience in portable and automotive systems.
Availability
MAX6828MUT-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, automotive body control modules, and industrial sensor nodes requiring stable component supply across extended temperature ranges (-40°C to +125°C).
Supply support for MAX6828MUT-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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX6826–MAX6831 family delivers ultra-low-voltage dual-supply supervision with integrated watchdog and manual reset, targeting space-constrained, battery-operated systems where reliability under brownout and fault conditions is critical.
FAQ
What is the exact VCC reset threshold voltage for MAX6828MUT-T?
The MAX6828MUT-T has a factory-trimmed VCC reset threshold of 3.08V, with tolerance of ±3% over the full operating temperature range (-40°C to +125°C). This value is specified in the Electrical Characteristics table under "VCC Reset Threshold (VCC Falling)" for the "T" suffix variant. The threshold remains stable due to internal trimming and exhibits a temperature coefficient of 60ppm/°C.
Does MAX6828MUT-T support monitoring a secondary voltage lower than 0.9V?
Yes, the MAX6828MUT-T supports monitoring secondary voltages down to 0.6V using its RESET IN pin, which features a fixed 0.63V (typ) internal reference. By connecting an external resistor divider between the target rail and GND, with the midpoint fed to RESET IN, any voltage above ~0.6V can be scaled to trigger at the 0.63V threshold. This capability is explicitly confirmed in the "Features" section and "Adjustable Reset Thresholds" subsection of the datasheet.
Can MAX6828MUT-T's watchdog timer be disabled without hardware modification?
Yes, the watchdog function of MAX6828MUT-T is disabled by leaving the WDI pin unconnected or driving it with a three-stated buffer. When WDI is floating, the internal driver toggles low-high-low every ~1.4s, preventing timeout. No external pullup/down or solder jumpers are required. This behavior is documented in the "Watchdog Input" section and confirmed in Figure 4 timing diagram notes.
Is MAX6828MUT-T compatible with microcontrollers that have bidirectional reset pins?
Yes, MAX6828MUT-T is specifically designed for this use case. Its open-drain RESET output allows direct connection to bidirectional µP reset I/O (e.g., Motorola 68HC11) with only a single external pullup resistor. This eliminates contention risks and avoids the need for level translators. Application Figure 6 in the datasheet explicitly illustrates this interface configuration.
What is the minimum VCC voltage at which MAX6828MUT-T guarantees valid reset assertion?
The MAX6828MUT-T guarantees correct reset output behavior down to VCC = +1.0V, as stated in the General Description and Absolute Maximum Ratings sections. This means the device will assert RESET correctly even during deep brownout conditions where VCC drops below typical logic thresholds. This specification is validated across the full -40°C to +125°C temperature range and is a key differentiator versus many competing supervisors.
MAX6828MUT-T 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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.38V, Adj
- Output:
- Open Drain or Open Collector
- 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
MAX6828MUT-T FAQ
1.How can I place an order for MAX6828MUT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6828MUT-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 MAX6828MUT-T reliable?
The price and inventory of MAX6828MUT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6828MUT-T is usually 5 days.
3.What payment methods are accepted for MAX6828MUT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6828MUT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6828MUT-T?
MAX6828MUT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6828MUT-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 MAX6828MUT-T?
For technical support, including MAX6828MUT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6828MUT-T requirements.
6.How does Aetrix verify that MAX6828MUT-T is sourced from the original manufacturer or authorized distributors?
All MAX6828MUT-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 MAX6828MUT-T meets industry standards.
7.What is the process for return or replacement of MAX6828MUT-T?
All MAX6828MUT-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6828MUT-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 MAX6828MUT-T part is unused and in its original packaging.
Return procedure for MAX6828MUT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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