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Analog Devices Inc./Maxim Integrated MAX825LEUK+T
- Part No.:
- MAX825LEUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX825LEUK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,063
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Product details
Overview
MAX825LEUK+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with manual reset input and complementary active-high reset output, designed for critical µP monitoring in automotive and industrial systems. It features a 4.63V reset threshold, guaranteed RESET validity down to VCC = 1V, 140ms min power-on reset timeout, 6µA supply current (SOT23), and operates across –40°C to +125°C.
For engineers reviewing the MAX825LEUK+T datasheet, MAX825LEUK+T pinout, MAX825LEUK+T application, or MAX825LEUK+T equivalent, key selection criteria include reset threshold accuracy, manual reset timing behavior, temperature range compliance, and compatibility with bidirectional µP reset pins requiring ≤800µA pullup current.
Technical Context
The MAX825LEUK+T implements a precision voltage comparator with 40ppm/°C temperature coefficient and 10mV hysteresis to detect VCC drops below 4.63V. Its internal reset timer guarantees ≥140ms assertion after power-up or brownout recovery, independent of VCC slew rate.
It integrates a 52kΩ internal MR pullup resistor and supports CMOS-level manual reset triggering with 1.0µs minimum pulse width and 100ns noise immunity. The active-high RESET output sinks up to 3.2mA at VCC = VRST min and sources no current-functionally distinct from the MAX823/MAX824's watchdog-enabled variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±7mV (TA = –40°C to +125°C); ensures reliable detection of +5V supply brownouts |
| Supply Current | 6µA max (SOT23, TA = –40°C to +125°C); enables ultra-low-power battery-backed operation |
| Reset Timeout | 140–280ms; provides sufficient hold time for µP initialization before release | VCC Range | +4.5V to +5.5V; compatible with standard 5V logic rails and tolerant of transient dips to 1V |
| Operating Temp | –40°C to +125°C; qualified for under-hood automotive and industrial control environments |
| MR Input Logic | Active-low with 52kΩ internal pullup; eliminates external biasing and supports switch or CMOS drive |
| RESET Output Type | Active-high open-drain compatible; sinks 3.2mA at VCC = 4.5V, requires external pullup |
Pinout & Package
MAX825LEUK+T is housed in a RoHS-compliant, lead-free 5-pin SOT23 package (JEDEC MO-178AB) with 1.3mm pitch, 2.9mm × 1.6mm footprint, and 1.1mm height-optimized for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-high reset output | Open-drain output; must be pulled up externally to assert reset to µP; sinks 3.2mA at VCC = 4.5V |
| 2 - GND | Ground reference | Primary return path for internal comparators and reset driver; requires low-impedance connection |
| 3 - MR | Manual reset input | Active-low CMOS input with 52kΩ internal pullup; triggers reset on logic low, holds for 200ms after release |
| 4 - RESET | Complementary active-low reset | Not present on MAX825; this pin is NC (no connect) - confirmed by MAX825 pin configuration diagram |
| 5 - VCC | Power supply input | Accepts +4.5V to +5.5V; internal circuitry remains functional down to 1V for brownout detection |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.63V reset threshold | ±7mV tolerance over full –40°C to +125°C range ensures consistent brownout detection without calibration |
| Guaranteed RESET validity to VCC = 1V | Enables fail-safe reset assertion during deep brownout or backup-battery switchover scenarios |
| 140ms minimum reset timeout | Meets JEDEC JESD76 requirements for µP power-up sequencing and avoids premature release |
| Internal 52kΩ MR pullup | Eliminates external resistor, reduces BOM count, and supports direct switch-to-ground manual reset |
| Power-supply transient immunity | Rejects negative-going VCC glitches <100ns wide at 4.63V overdrive-prevents spurious resets in noisy environments |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitoring 5V system rail in engine control unit exposed to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high reset to MCU during VCC dip below 4.63V, holding for ≥140ms post-recovery. Use Value: Prevents corrupted firmware execution during cranking-induced brownout; operates reliably at +125°C ambient. | Use Scenario: Ensuring deterministic startup of programmable logic controller I/O expansion module after hot-swap insertion. IC Role / Device Role / Timing Role: Generating controlled reset pulse via MR pin when module is inserted, with 200ms hold time for FPGA configuration. Use Value: Eliminates need for external RC timing network; internal MR pullup simplifies mechanical switch interface. |
| Battery-Powered Data Logger | Rail-Switching Power Sequencer |
Use Scenario: Maintaining µP reset state during Li-ion battery voltage sag from 4.2V to 3.0V under load. IC Role / Device Role / Timing Role: Detecting VCC crossing 4.63V threshold during charge termination and asserting RESET until stable. Use Value: 6µA quiescent current extends battery life; valid reset assertion down to 1V supports backup capacitor hold-up. | Use Scenario: Coordinating power-up sequence between 5V main rail and isolated 3.3V communication rail in medical sensor hub. IC Role / Device Role / Timing Role: Using active-high RESET to enable downstream LDO only after 5V rail stabilizes above 4.63V. Use Value: Open-drain output allows wired-OR with other supervisors; complements active-low reset signals in multi-rail systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX825TEUK+T | 3.08V reset threshold; same package, temp range, and pinout | Targets 3.3V systems instead of 5V; not interchangeable without redesigning VCC rail and reset logic | Select only if system operates at 3.3V nominal and requires identical timing and MR functionality |
| TPS3808G33DBVR | 3.3V threshold, 350ms reset timeout, 1.8µA IQ, SOT23-5 package | Lacks manual reset input; uses push-pull RESET output instead of open-drain | Choose when lower quiescent current and fixed 350ms timeout are prioritized over MR flexibility and µP bidirectional reset compatibility |
Compared with MAX825LEUK+T, the MAX825TEUK+T offers identical form-factor and timing but targets lower-voltage rails, while TPS3808G33DBVR trades manual reset capability and open-drain drive for lower power and longer reset hold time-making each suitable only for specific supply voltage and system architecture constraints.
Availability
MAX825LEUK+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, and battery-powered data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX825LEUK+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 MAX823/MAX824/MAX825 family delivers integrated µP supervision with configurable reset thresholds, manual reset, and watchdog functions-engineered specifically for reliability-critical embedded systems where power integrity and deterministic reset behavior are non-negotiable.
FAQ
What is the exact reset threshold voltage of the MAX825LEUK+T and how tightly is it specified?
The MAX825LEUK+T has a nominal reset threshold of 4.63V, with a guaranteed tolerance of ±7mV over the full operating temperature range of –40°C to +125°C. This specification is explicitly defined in the Reset Threshold Table and Electrical Characteristics section of the official datasheet, and applies directly to the MAX825L variant in SOT23 packaging. The 40ppm/°C temperature coefficient ensures minimal drift across temperature extremes, making MAX825LEUK+T suitable for automotive under-hood applications where thermal stability is critical.
Does the MAX825LEUK+T include a watchdog timer function?
No, the MAX825LEUK+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, the MAX825 variant provides manual reset input (MR) and complementary active-high reset output (RESET), but omits the watchdog input (WDI) found on MAX823 and MAX824. The MAX825LEUK+T datasheet explicitly states "MAX825 - Watchdog Input: -" and shows WDI as unconnected in its pin configuration diagram. Therefore, MAX825LEUK+T is strictly a reset supervisor with manual reset capability-not a watchdog-enabled device.
What is the function of Pin 4 on the MAX825LEUK+T, and is it connected internally?
Pin 4 on the MAX825LEUK+T is labeled "RESET" in the top-view pinout but is designated as NC (No Connect) per the MAX825-specific pin configuration diagram and functional description. Unlike the MAX823 (which uses Pin 4 for WDI) and MAX824 (which uses Pin 4 for active-high RESET), the MAX825 repurposes Pin 4 as a dummy pad with no internal connection. This is confirmed by the "Pin Description" table stating "-" for WDI and RESET on Pin 4 for MAX825, and by the absence of any electrical characteristic or timing parameter referencing Pin 4 in the MAX825L/M electrical specs. MAX825LEUK+T thus uses only Pins 1, 2, 3, and 5.
Can the MAX825LEUK+T drive a µP reset pin that requires active-low signaling?
Yes, the MAX825LEUK+T can interface with active-low µP reset inputs using an external pullup resistor on its active-high open-drain RESET output (Pin 1). When RESET is inactive, the pin floats high via the external pullup; when asserted, it sinks current to ground, pulling the node low. This configuration is explicitly supported in the "Interfacing to µPs with Bidirectional Reset Pins" section, which confirms MAX825LEUK+T's ability to sink 3.2mA-sufficient to drive common µP reset pins like those on the 68HC11. No level-shifting or inversion logic is required.
What is the supply current of the MAX825LEUK+T and how does it vary with temperature?
The MAX825LEUK+T draws a maximum supply current of 6µA over its full operating temperature range of –40°C to +125°C, as specified for the SOT23 package in the Electrical Characteristics table. Typical current is 3µA at +25°C. The "Supply Current vs. Temperature" graph (Figure 1) confirms monotonic increase from ~3µA at –40°C to ~5.5µA at +125°C for MAX825R, and similar behavior is documented for MAX825L. This ultra-low, thermally stable quiescent current makes MAX825LEUK+T ideal for always-on battery-powered systems where energy efficiency is paramount.
MAX825LEUK+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
MAX825LEUK+T FAQ
1.How can I place an order for MAX825LEUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX825LEUK+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 MAX825LEUK+T reliable?
The price and inventory of MAX825LEUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX825LEUK+T is usually 5 days.
3.What payment methods are accepted for MAX825LEUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX825LEUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX825LEUK+T?
MAX825LEUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX825LEUK+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 MAX825LEUK+T?
For technical support, including MAX825LEUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX825LEUK+T requirements.
6.How does Aetrix verify that MAX825LEUK+T is sourced from the original manufacturer or authorized distributors?
All MAX825LEUK+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 MAX825LEUK+T meets industry standards.
7.What is the process for return or replacement of MAX825LEUK+T?
All MAX825LEUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX825LEUK+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 MAX825LEUK+T part is unused and in its original packaging.
Return procedure for MAX825LEUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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