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Analog Devices Inc./Maxim Integrated MAX6825WUK+T
- Part No.:
- MAX6825WUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6825WUK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,820
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Product details
Overview
MAX6825WUK+T from Maxim Integrated is a low-voltage microprocessor supervisory IC in 5-pin SOT23 package, featuring manual reset input (MR), dual push-pull reset outputs (RESET and RESET), and voltage monitoring at 1.67V threshold. It asserts reset during power-up, brownout, or software fault conditions, with guaranteed reset validity down to VCC = +1.0V and 140ms minimum reset timeout. Used in portable/battery-powered equipment and embedded controllers for reliable µP initialization.
For engineers reviewing the MAX6825WUK+T datasheet, MAX6825WUK+T pinout, MAX6825WUK+T application, or MAX6825WUK+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset timing behavior, true supply current specs across temperature, and validated alternative options for critical µP monitoring designs.
Technical Context
The MAX6825WUK+T integrates three core functions: precision voltage monitoring with fixed 1.67V reset threshold (±3% over –40°C to +125°C), debounced manual reset input with internal 50kΩ pullup, and dual active-high/active-low push-pull reset outputs. Its reset generator ensures deterministic assertion during VCC fall below threshold and maintains reset for ≥140ms after VCC recovery.
No watchdog timer is present - unlike MAX6821–MAX6824 - and WDI pin is omitted. The device operates from VCC = +1.53V to +2.0V (matching its 1.67V threshold range), draws only 5–20µA supply current over full temperature range, and guarantees correct reset state down to VCC = +1.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.67V ±3% (VCC falling); enables reliable supervision of 1.8V systems during brownout |
| Reset Timeout Period | 140ms min (–40°C to +85°C); ensures µP completes power stabilization before release |
| VCC Operating Range | +1.53V to +2.0V (for 1.67V threshold version); supports low-power 1.8V rail monitoring |
| Supply Current (ICC) | 5µA typ / 20µA max (–40°C to +125°C, VCC = +1.8V); minimizes battery drain in portable gear |
| Reset Output Type | Dual push-pull: RESET (active-low), RESET (active-high); eliminates external pull resistors |
| Reset Validity Limit | Guaranteed operation down to VCC = +1.0V; maintains reset integrity during deep undervoltage |
| Manual Reset Input | MR with 50kΩ internal pullup; accepts CMOS logic or momentary switch to GND; no external debounce needed |
Pinout & Package
MAX6825WUK+T is housed in a RoHS-compliant 5-pin SOT23-5 package (outline U5-1, land pattern 21-0057), measuring 2.9mm × 1.6mm × 1.1mm, suitable for space-constrained PCB layouts in portable and embedded applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-low) | Push-pull output asserted low during reset; drives µP reset pin directly without pullup |
| 2 | GND | Ground reference for all internal circuitry and reset timing accuracy |
| 3 | MR (manual reset) | Active-low input with internal 50kΩ pullup to VCC; initiates reset when pulled to GND |
| 4 | RESET (active-high) | Push-pull output asserted high during reset; interfaces with logic requiring active-high enable |
| 5 | VCC | Supply input and monitored voltage source; powers device and sets reset threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Dual push-pull reset outputs | Eliminates need for external pull resistors on both active-high and active-low reset paths |
| 1.67V precision reset threshold | Matches 1.8V system rails with ±3% tolerance over full industrial temperature range |
| 140ms minimum reset timeout | Ensures stable power delivery before µP exit from reset, preventing premature code execution |
| MR with internal 50kΩ pullup | Reduces BOM count; allows direct connection of momentary switch to GND without external components |
| Valid reset down to VCC = +1.0V | Maintains fail-safe behavior even during severe undervoltage events in battery-powered systems |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Wearable health monitors and handheld test instruments operating from single-cell Li-ion batteries with tight voltage margins. IC Role / Device Role / Timing Role: Supervises 1.8V core rail and triggers hard reset if battery sags below 1.67V during peak load or cold temperature. Use Value: Prevents firmware corruption by guaranteeing µP remains held in reset until VCC stabilizes above threshold and timeout expires. |
Use Scenario: Industrial PLC modules with ARM Cortex-M microcontrollers requiring deterministic power-on initialization. IC Role / Device Role / Timing Role: Provides dual-reset signaling (active-low and active-high) to match µP and FPGA reset requirements simultaneously. Use Value: Enables single-component solution for mixed-logic-family reset coordination without level-shifting or discrete buffers. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Portable multimeters and oscilloscopes with segmented LCD displays and analog front-ends powered from regulated 1.8V supplies. IC Role / Device Role / Timing Role: Monitors 1.8V analog/digital supply and asserts synchronized reset to µP and display controller upon undervoltage. Use Value: Eliminates display ghosting or ADC offset drift caused by partial-power-up states during battery replacement. |
Use Scenario: Medical diagnostic devices where µP failure must trigger immediate hardware-level reset without software intervention. IC Role / Device Role / Timing Role: Acts as independent hardware watchdog substitute via MR input tied to safety-critical sensor interrupt lines. Use Value: Delivers fail-operational capability: external fault signal forces reset within 200ns, bypassing µP firmware entirely. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6823WUK+T | Same 1.67V threshold, same SOT23-5 package, but features single active-low push-pull RESET and includes watchdog timer (WDI pin present) | Supports software fault detection via watchdog; requires WDI routing and firmware servicing | Select MAX6823WUK+T only if watchdog functionality is required; MAX6825WUK+T is preferred when watchdog adds complexity or leakage risk |
| TPS3808G16DBVR | TI part with 1.6V threshold, 200ms reset timeout, open-drain RESET, no RESET output, no MR input | Lacks manual reset and dual-reset capability; requires external pullup and separate logic for active-high signaling | Choose TPS3808G16DBVR only for cost-sensitive, non-manual-reset applications where single open-drain output suffices |
Compared with MAX6825WUK+T, MAX6823WUK+T adds watchdog capability at the cost of increased pin count and firmware dependency, while TPS3808G16DBVR reduces feature set to lower cost but sacrifices MR support and dual-output flexibility essential for robust embedded reset architecture.
Availability
MAX6825WUK+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, intelligent instruments, and critical µP monitoring applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX6825WUK+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, with emphasis on reliability, low power, and integration.
The MAX6821–MAX6825 family was engineered specifically for low-voltage microprocessor supervision in space- and power-constrained systems, delivering combined voltage monitoring, manual reset, and dual-reset signaling in minimal 5-pin SOT23 form factor.
FAQ
What is the exact reset threshold voltage of MAX6825WUK+T and how tightly is it specified?
The MAX6825WUK+T has a factory-trimmed reset threshold of 1.67V, with guaranteed tolerance of ±3% over the full operating temperature range (–40°C to +125°C). This specification is confirmed in the Electrical Characteristics table under "VCC Reset Threshold (VCC Falling)" for suffix "W", and ensures accurate supervision of 1.8V supply rails during brownout conditions without false triggering.
Does MAX6825WUK+T include a watchdog timer function?
No, MAX6825WUK+T does not include a watchdog timer. Unlike MAX6821–MAX6824 variants, the MAX6825 omits the WDI (watchdog input) pin and associated timing circuitry. Its pinout contains only VCC, GND, MR, RESET, and RESET - confirming dedicated focus on voltage monitoring and manual reset without software supervision overhead.
What are the electrical characteristics of the RESET and RESET outputs on MAX6825WUK+T?
Both RESET (active-low) and RESET (active-high) are push-pull outputs. RESET sinks up to 3.2mA at VCC ≥ 4.75V with VOL ≤ 0.4V; RESET sources up to 800µA at VCC ≥ 4.75V with VOH ≥ 0.8 × VCC. Each output is fully specified down to VCC = +1.0V, ensuring interoperability with low-voltage logic families across the entire operating range of MAX6825WUK+T.
How does the manual reset input (MR) behave on MAX6825WUK+T?
The MR input on MAX6825WUK+T is active-low with an internal 50kΩ pullup resistor to VCC. Pulling MR to GND asserts both reset outputs for the full timeout period (≥140ms), and reset remains active for that duration after MR returns high. MR accepts standard CMOS logic levels and tolerates glitches <100ns; no external components are required for basic switch-based reset implementation.
What is the minimum VCC voltage at which MAX6825WUK+T guarantees correct reset output states?
MAX6825WUK+T guarantees correct reset output states - including proper assertion and deassertion timing - down to VCC = +1.0V. This is explicitly stated in the General Description and confirmed in the Absolute Maximum Ratings and Electrical Characteristics sections, making it uniquely suited for ultra-low-voltage brownout protection in deeply discharged battery scenarios.
MAX6825WUK+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.67V
- 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
MAX6825WUK+T FAQ
1.How can I place an order for MAX6825WUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6825WUK+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 MAX6825WUK+T reliable?
The price and inventory of MAX6825WUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6825WUK+T is usually 5 days.
3.What payment methods are accepted for MAX6825WUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6825WUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6825WUK+T?
MAX6825WUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6825WUK+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 MAX6825WUK+T?
For technical support, including MAX6825WUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6825WUK+T requirements.
6.How does Aetrix verify that MAX6825WUK+T is sourced from the original manufacturer or authorized distributors?
All MAX6825WUK+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 MAX6825WUK+T meets industry standards.
7.What is the process for return or replacement of MAX6825WUK+T?
All MAX6825WUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6825WUK+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 MAX6825WUK+T part is unused and in its original packaging.
Return procedure for MAX6825WUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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