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Analog Devices Inc./Maxim Integrated MAX6825MUK-T
- Part No.:
- MAX6825MUK-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6825MUK-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
MAX6825MUK-T from Maxim Integrated is a low-voltage microprocessor supervisory circuit in a 5-pin SOT23 package, featuring manual reset input (MR), dual push-pull reset outputs (RESET and RESET), and voltage monitoring at 4.38V threshold. It asserts reset during power-up, brownout, or manual trigger, guarantees valid reset down to VCC = +1.0V, and supports critical µP monitoring in portable and embedded systems.
For engineers reviewing the MAX6825MUK-T datasheet, MAX6825MUK-T pinout, MAX6825MUK-T application, or MAX6825MUK-T equivalent, this device delivers deterministic 140ms minimum reset timeout, 1.6s watchdog timer (not implemented in MAX6825), and robust immunity to negative VCC transients - key for reliable system initialization and fault recovery in battery-powered and industrial controllers.
Technical Context
The MAX6825MUK-T implements a precision bandgap-based voltage monitor with 4.38V ±3% threshold (suffix "M"), fixed 140ms min reset timeout, and an internal 50kΩ MR pullup resistor. Its dual push-pull reset outputs operate independently: RESET is active-low, RESET is active-high - enabling direct interface with bidirectional or polarity-sensitive µP reset pins without external logic.
No watchdog timer functionality is present in MAX6825; unlike MAX6821–MAX6824, it omits WDI input and associated timing circuitry. The device operates across –40°C to +125°C, maintains reset validity down to VCC = +1.0V, and tolerates VCC transients ≤20µs at 100mV overdrive without spurious reset assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V ±3% - precisely monitors +4.5V supply rails with guaranteed hysteresis and 60ppm/°C tempco. |
| Reset Timeout Period | 140ms (min) - ensures µP remains held in reset long enough for stable power rail settling and clock stabilization. |
| Supply Voltage Range | +1.2V to +5.5V (–40°C to +125°C) - supports operation during deep brownout and enables use with ultra-low-power logic. |
| Reset Output Drive | Push-pull RESET (active-low) and push-pull RESET (active-high) - eliminates need for external pull-ups/downs and simplifies interface to diverse µP reset architectures. |
| MR Input Logic | Active-low with 50kΩ internal pullup - allows momentary switch-to-GND implementation; no external components required for manual reset function. |
| VCC Reset Validity | Guaranteed to VCC = +1.0V - ensures correct reset state even during severe undervoltage conditions before power collapse. |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood, industrial control, and extended-temperature embedded applications. |
Pinout & Package
Package: 5-pin SOT23-5 (U5-1 outline), surface-mount, RoHS-compliant, footprint compatible with standard 0.95mm pitch land pattern (Maxim land pattern no. 21-0057).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-low) | Push-pull output asserted low during reset; drives µP reset pin directly without pull-up resistor. |
| 2 | GND | Ground reference for all internal circuits and reset timing; must be low-impedance connection. |
| 3 | MR (manual reset) | Active-low input with internal 50kΩ pullup to VCC; debounced internally; 1µs minimum pulse width. |
| 4 | WDI | Not connected / unused - MAX6825 excludes watchdog functionality; pin is no-connect and may be left floating. |
| 5 | VCC | Supply input and monitored voltage source; powers internal circuitry and sets reset threshold reference. |
Key Features
| Feature | Design Value |
|---|---|
| Dual push-pull reset outputs | Enables simultaneous active-low and active-high reset signaling - eliminates level-shifting or inverters for mixed-logic µP interfaces. |
| Manual reset with internal pullup | Reduces BOM count by removing external pullup resistor; supports clean switch-to-GND implementation with no debounce circuitry. |
| Reset validity to VCC = +1.0V | Ensures fail-safe behavior during catastrophic supply collapse - reset remains asserted until VCC drops below functional logic threshold. |
| Immunity to short VCC transients | Rejects ≤20µs negative glitches at 100mV overdrive - prevents false resets in electrically noisy environments like motor drives or SMPS proximity. |
| Preprogrammed 4.38V threshold | Eliminates external resistor divider tuning; factory-trimmed for accuracy and stability across temperature and process variation. |
Applications
| Set-Top Boxes | Embedded Controllers |
|---|---|
Use Scenario: Power sequencing and fault recovery in digital video broadcast receivers with multi-rail supplies and real-time OS. IC Role / Device Role / Timing Role: Supervises +4.5V AVDD rail and asserts synchronized reset to ARM-based SoC during cold start or brownout. Use Value: Prevents corrupted firmware execution by holding SoC in reset until 4.38V rail stabilizes for ≥140ms, ensuring clean boot sequence. | Use Scenario: Industrial PLC modules requiring deterministic restart after power interruption or watchdog-triggered failure. IC Role / Device Role / Timing Role: Monitors main +5V logic supply and provides dual-reset signaling to both FPGA configuration controller and safety-critical MCU. Use Value: Active-low RESET holds MCU in reset while active-high RESET releases FPGA I/O banks - enabling staggered, safe reinitialization. |
| Portable/Battery-Powered Equipment | Critical µP Monitoring |
Use Scenario: Handheld test instruments powered by single-cell Li-ion with dynamic load-induced voltage sag. IC Role / Device Role / Timing Role: Detects 4.38V threshold breach during high-current RF transmission bursts and triggers controlled shutdown/reset. Use Value: Guarantees reset assertion down to VCC = +1.0V - maintains system integrity even as battery voltage collapses below 2.0V during peak discharge. | Use Scenario: Medical diagnostic equipment where µP lockup could compromise patient safety or data integrity. IC Role / Device Role / Timing Role: Standalone supervisor for primary controller, independent of software-based watchdogs, with hardware-enforced reset timing. Use Value: Provides fail-operational reset assurance - no reliance on µP-generated watchdog pulses; manual reset allows technician-initiated recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6822MUK-T | Same 4.38V threshold and package, but features open-drain RESET (not push-pull) and includes WDI input with 1.6s watchdog timer. | Requires external pull-up for RESET; supports software watchdog monitoring - unsuitable if watchdog is unwanted or WDI routing is impractical. | Select MAX6822MUK-T only when open-drain flexibility or watchdog supervision is required; MAX6825MUK-T is preferred for simpler, watchdog-free designs with dual-push-pull drive. |
| TPS3808G33DBVR | TI part with 3.3V threshold, 200ms reset timeout, and no manual reset input; uses SOT23-6 package with different pinout. | Lacks MR pin and dual-reset outputs; designed for single-rail 3.3V systems - not drop-in compatible and requires PCB redesign. | Choose TPS3808G33DBVR only for cost-sensitive 3.3V-only applications without manual reset needs; MAX6825MUK-T remains optimal for 4.38V monitoring with MR and dual-reset capability. |
Compared with MAX6822MUK-T, MAX6825MUK-T removes watchdog complexity and adds dual push-pull outputs, simplifying µP interface; versus TPS3808G33DBVR, it offers higher threshold, manual reset, and pin-compatible SOT23-5 layout - making it superior for 4.5V-system reliability with minimal design overhead.
Availability
MAX6825MUK-T is available at Aetrix Electronics and suitable for set-top boxes, embedded controllers, and portable/battery-powered equipment requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +125°C operation.
Supply support for MAX6825MUK-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 MAX6821–MAX6825 family targets space-constrained µP-based systems needing reliable, low-component-count supervision - optimized for fast, accurate voltage monitoring and deterministic reset timing without software dependency.
FAQ
What is the reset threshold voltage of the MAX6825MUK-T?
The MAX6825MUK-T has a factory-programmed reset threshold of 4.38V ±3%, corresponding to the "M" suffix in its part number. This value is specified over the full operating temperature range (–40°C to +125°C) and includes guaranteed hysteresis and 60ppm/°C temperature coefficient. The threshold is referenced to VCC and remains stable under varying load and supply conditions, making MAX6825MUK-T suitable for monitoring +4.5V rails in industrial and consumer equipment.
Does the MAX6825MUK-T include a watchdog timer function?
No, the MAX6825MUK-T does not include a watchdog timer. Unlike MAX6821–MAX6824 variants, MAX6825MUK-T omits the WDI (watchdog input) pin functionality entirely - Pin 4 is a no-connect. The device provides only voltage monitoring, manual reset input, and dual push-pull reset outputs. This makes MAX6825MUK-T ideal for applications requiring hardware reset supervision without software-dependent watchdog oversight.
What are the electrical characteristics of the RESET and RESET outputs on the MAX6825MUK-T?
The MAX6825MUK-T features two independent push-pull reset outputs: RESET (active-low) and RESET (active-high). RESET sinks up to 3.2mA at VCC ≥ 4.25V with VOL ≤ 0.4V; RESET sources up to 800µA at VCC ≥ 4.75V with VOH ≥ 0.8 × VCC. Both outputs remain fully functional down to VCC = +1.0V, ensuring reliable signaling even during deep brownout - a key differentiator of MAX6825MUK-T in mission-critical systems.
Can the manual reset input (MR) of the MAX6825MUK-T be left unconnected?
Yes, the MR pin of the MAX6825MUK-T can be left unconnected because it includes an internal 50kΩ pullup resistor to VCC. When unused, MR floats high and has no effect on reset state. If external control is needed, a normally open momentary switch from MR to GND provides debounced manual reset without additional components. Leaving MR unconnected disables manual reset functionality while preserving full voltage-monitoring and automatic reset behavior in MAX6825MUK-T.
Is the MAX6825MUK-T compatible with other parts in the MAX6821–MAX6825 family in terms of PCB layout?
Yes, the MAX6825MUK-T shares the identical 5-pin SOT23-5 (U5-1) package and pinout with all MAX6821–MAX6825 variants, including MAX6821MUK-T through MAX6824MUK-T. Pin 1 is RESET, Pin 2 is GND, Pin 3 is MR, Pin 4 is WDI (no-connect in MAX6825MUK-T), and Pin 5 is VCC. This allows direct PCB footprint reuse across the family - though functional differences (e.g., WDI presence, reset output type) must be verified in schematic design to ensure correct MAX6825MUK-T integration.
MAX6825MUK-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6825MUK-T FAQ
1.How can I place an order for MAX6825MUK-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6825MUK-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 MAX6825MUK-T reliable?
The price and inventory of MAX6825MUK-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6825MUK-T is usually 5 days.
3.What payment methods are accepted for MAX6825MUK-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6825MUK-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6825MUK-T?
MAX6825MUK-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6825MUK-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 MAX6825MUK-T?
For technical support, including MAX6825MUK-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6825MUK-T requirements.
6.How does Aetrix verify that MAX6825MUK-T is sourced from the original manufacturer or authorized distributors?
All MAX6825MUK-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 MAX6825MUK-T meets industry standards.
7.What is the process for return or replacement of MAX6825MUK-T?
All MAX6825MUK-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6825MUK-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 MAX6825MUK-T part is unused and in its original packaging.
Return procedure for MAX6825MUK-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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