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Analog Devices Inc./Maxim Integrated MAX6825LUK+T
- Part No.:
- MAX6825LUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6825LUK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,664
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Product details
Overview
MAX6825LUK+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 4.63V threshold. It asserts reset during power-up, brownout, or manual trigger, with guaranteed operation down to VCC = +1.0V and 140ms minimum reset timeout. Used in set-top boxes, embedded controllers, and portable battery-powered equipment.
For engineers reviewing the MAX6825LUK+T datasheet, MAX6825LUK+T pinout, MAX6825LUK+T application, or MAX6825LUK+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset timing, true watchdog behavior (absent in MAX6825), and validated alternative options for µP supervision in industrial and portable systems.
Technical Context
The MAX6825LUK+T implements independent voltage monitoring of VCC against a factory-trimmed 4.63V threshold with ±3% accuracy over –40°C to +125°C, and guarantees valid reset assertion even when VCC drops to +1.0V. Its dual push-pull outputs provide active-low RESET and active-high RESET signals simultaneously, enabling direct interface with microcontrollers requiring complementary reset logic states.
No watchdog timer is integrated in MAX6825 - unlike MAX6821–MAX6824 - and WDI pin is omitted per Selector Guide and Pin Configurations. The MR input includes an internal 50kΩ pullup resistor, accepts CMOS-compatible logic levels, and provides 100ns glitch rejection with 200ns MR-to-reset delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±3% (L-suffix); ensures reliable power-on reset for +5V systems with margin against supply droop |
| Reset Timeout Period | 140ms min (tRP); holds µP in reset long enough for stable clock and supply settling |
| VCC Operating Range | +1.2V to +5.5V (–40°C to +125°C); supports operation during deep brownout without loss of reset validity |
| RESET Output Type | Dual push-pull: active-low RESET and active-high RESET; eliminates need for external inverters or pull-ups |
| MR Input Behavior | Active-low with 50kΩ internal pullup; debounced internally - no external RC required for momentary switch interface |
| Supply Current | 20µA max at +5.5V, –40°C to +125°C; enables use in always-on battery-backed subsystems |
| Reset Propagation Delay | 20µs max (tRD) from VCC falling through threshold; ensures fast response to supply collapse |
Pinout & Package
Package: 5-pin SOT23-5 (U5-1 outline), surface-mount, RoHS-compliant (+T suffix), footprint land pattern 91-0174.
| 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 |
| 2 | GND | Ground reference for all internal circuitry and reset timing; must be low-impedance connection |
| 3 | MR (manual reset) | Active-low input with internal 50kΩ pullup; initiates reset on logic low, held for full 140ms timeout after release |
| 4 | RESET (active-high) | Push-pull output asserted high during reset; interfaces with logic requiring active-high enable or status signal |
| 5 | VCC | Supply and monitored voltage input; powers device and sets reset threshold reference point |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | Simultaneous active-low and active-high push-pull RESET signals eliminate external level-shifting or inversion |
| Guaranteed reset validity to VCC = +1.0V | Ensures fail-safe reset assertion even during severe brownout conditions where other supervisors lose functionality |
| No external components required | Internal pullup on MR, precision voltage reference, and timing capacitor-free design reduce BOM count and board area |
| Immunity to short negative VCC transients | Withstands ≤20µs, 100mV VCC glitches without spurious reset - critical for noisy power environments |
| –40°C to +125°C operating range | Qualified for extended industrial and automotive under-hood applications without derating |
Applications
| Set-Top Boxes | Embedded Controllers |
|---|---|
Use Scenario: Power sequencing and fault recovery in digital video broadcast receivers with multi-rail supplies. IC Role / Device Role / Timing Role: Voltage supervisor asserting synchronized reset to main SoC and peripheral controllers during AC dropout or cold start. Use Value: Prevents firmware corruption by guaranteeing 140ms reset hold time while +3.3V and +5V rails stabilize post-power-up. |
Use Scenario: Industrial PLC modules requiring deterministic restart after watchdog timeout or operator-initiated reset. IC Role / Device Role / Timing Role: Dual-output supervisor providing both /RESET and RESET signals to coordinate FPGA configuration and MCU boot sequence. Use Value: Eliminates need for discrete inverters or logic gates, reducing layout complexity and improving timing predictability. |
| Portable/Battery-Powered Equipment | Intelligent Instruments |
Use Scenario: Handheld test meters powered by single-cell Li-ion with dynamic load-induced supply sag. IC Role / Device Role / Timing Role: Low-quiescent-current (20µA) supervisor monitoring VCC and triggering reset before brownout causes ADC or display malfunction. Use Value: Valid reset assertion down to VCC = +1.0V ensures safe shutdown even as battery discharges below nominal voltage. |
Use Scenario: Benchtop multimeters and oscilloscopes requiring reliable power-on initialization and field-serviceable reset. IC Role / Device Role / Timing Role: Manual reset interface via front-panel button connected to MR pin, with internal debouncing and 140ms hold time. Use Value: Removes need for external RC debounce network, saving PCB space and eliminating component aging drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6821LUK+T | Includes 1.6s watchdog timer and open-drain RESET; lacks active-high RESET output | Required where software execution monitoring is mandatory; unsuitable when dual complementary reset signals are needed | Select MAX6821LUK+T only if watchdog functionality is essential and system design accommodates open-drain /RESET with external pull-up |
| MAX6823LUK+T | Features push-pull RESET only (no RESET); includes watchdog timer and MR input | Applicable where single active-low reset suffices and watchdog supervision is required | Choose MAX6823LUK+T when replacing legacy single-output supervisors and watchdog capability is non-negotiable |
Compared with MAX6825LUK+T, MAX6821LUK+T adds watchdog monitoring but removes active-high RESET and changes RESET to open-drain - requiring layout revision. MAX6823LUK+T retains MR and watchdog but omits RESET, limiting compatibility with designs relying on dual-signal reset coordination.
Availability
MAX6825LUK+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 RoHS-compliant sourcing.
Supply support for MAX6825LUK+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 industrial, computing, and consumer applications, with emphasis on power management, sensing, and reliability-critical functions.
The MAX6821–MAX6825 family targets compact, low-power µP supervision in space-constrained systems - specifically engineered for deterministic reset generation, manual intervention, and robust operation across wide temperature and supply ranges.
FAQ
Does MAX6825LUK+T include a watchdog timer?
No, MAX6825LUK+T does not include a watchdog timer. Per the Selector Guide and Pin Description, MAX6825 omits the WDI pin and associated watchdog circuitry - unlike MAX6821–MAX6824. The MAX6825LUK+T provides only voltage monitoring, manual reset, and dual push-pull reset outputs. If watchdog functionality is required, consider MAX6821LUK+T or MAX6823LUK+T instead.
What is the function of the RESET pin on MAX6825LUK+T?
The RESET pin (Pin 4) on MAX6825LUK+T is an active-high push-pull output that goes high during reset assertion and returns low when reset is released. It complements the active-low RESET (Pin 1) to provide simultaneous complementary reset signaling - enabling direct interface with microcontrollers or FPGAs requiring both logic polarities without external components. This dual-output architecture is unique to MAX6824 and MAX6825 within the family.
What is the reset threshold voltage for MAX6825LUK+T?
The reset threshold voltage for MAX6825LUK+T is 4.63V, as indicated by the "L" suffix in the part number. Electrical Characteristics confirm VTH = 4.63V ±3% over –40°C to +125°C, with hysteresis of 2 × VTH mV. This threshold is factory-trimmed and guaranteed - making MAX6825LUK+T suitable for supervising +5V systems with adequate margin against ripple and droop.
Can MAX6825LUK+T operate with VCC below 1.8V?
Yes, MAX6825LUK+T is specified to operate with VCC as low as +1.2V over –40°C to +125°C, and its reset outputs remain valid down to +1.0V. This allows reliable reset assertion during deep brownout conditions where many competing supervisors cease functioning. However, the 4.63V threshold means it is intended for +5V rail monitoring - not low-voltage core rails.
Is the MR input on MAX6825LUK+T internally pulled up?
Yes, the MR input on MAX6825LUK+T includes an internal 50kΩ pullup resistor to VCC, as documented in the Pin Description and Applications Information. This allows MR to be left unconnected when unused, or driven directly by a momentary switch to GND - eliminating the need for external pullup resistors or debounce circuitry. MR accepts standard CMOS logic levels and provides 100ns glitch rejection.
MAX6825LUK+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- 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
MAX6825LUK+T FAQ
1.How can I place an order for MAX6825LUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6825LUK+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 MAX6825LUK+T reliable?
The price and inventory of MAX6825LUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6825LUK+T is usually 5 days.
3.What payment methods are accepted for MAX6825LUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6825LUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6825LUK+T?
MAX6825LUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6825LUK+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 MAX6825LUK+T?
For technical support, including MAX6825LUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6825LUK+T requirements.
6.How does Aetrix verify that MAX6825LUK+T is sourced from the original manufacturer or authorized distributors?
All MAX6825LUK+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 MAX6825LUK+T meets industry standards.
7.What is the process for return or replacement of MAX6825LUK+T?
All MAX6825LUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6825LUK+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 MAX6825LUK+T part is unused and in its original packaging.
Return procedure for MAX6825LUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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