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Analog Devices Inc./Maxim Integrated MAX825MEUK+T
- Part No.:
- MAX825MEUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX825MEUK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,835
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Product details
Overview
MAX825MEUK+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with manual reset input and complementary active-high reset output, designed for precise power-supply monitoring in embedded systems. It features a 2.63V reset threshold, 200ms reset timeout, 2µA supply current (SC70), 6µA (SOT23), guaranteed RESET validity down to VCC = 1V, and operates across –40°C to +125°C.
For engineers reviewing the MAX825MEUK+T datasheet, MAX825MEUK+T pinout, MAX825MEUK+T application, or MAX825MEUK+T equivalent, key selection criteria include reset threshold accuracy, manual reset timing, temperature range compliance, and compatibility with bidirectional µP reset pins in automotive and industrial controllers.
Technical Context
The MAX825MEUK+T implements a precision voltage comparator with 40ppm/°C temperature coefficient and 5mV hysteresis to detect brownout conditions on VCC. Its internal reset timer ensures a minimum 140ms (typ. 200ms) assertion period after power-up or MR deassertion, independent of VCC slew rate.
Unlike the MAX823/MAX824, it omits watchdog functionality but integrates an internal 52kΩ pullup on the MR pin and supports dual reset outputs (active-low RESET and active-high RESET) for flexible interface with legacy or modern microcontrollers requiring either polarity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±1.5% - precisely monitors +2.7V to +3.6V supplies without external components |
| Reset Timeout Period | 140–280ms - ensures reliable µP initialization during slow-ramp power-up sequences |
| Supply Current | 6µA at +125°C - enables ultra-low-power operation in battery-backed systems |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| VCC Range for Reset Validity | Down to 1V - guarantees correct reset state even during deep brownout or backup-battery fallback |
| MR Input Pullup | 52kΩ internal - eliminates need for external resistor; supports direct switch-to-ground connection |
| Reset Output Drive | Sinks 3.2mA / sources 150µA - interfaces directly with CMOS/TTL inputs and bidirectional µP reset pins |
Pinout & Package
MAX825MEUK+T is housed in a RoHS-compliant, lead-free 5-pin SOT23-5 package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm, optimized for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low reset output | Asserts low for ≥200ms on power-up, brownout, or MR activation; valid down to VCC = 1V |
| 2 - GND | Ground reference | Common return path for all internal circuits; requires low-impedance PCB connection |
| 3 - RESET | Active-high reset output | Complementary to pin 1; provides inverted logic for µPs requiring active-high reset assertion |
| 4 - MR | Manual reset input | Active-low; internally pulled up to VCC via 52kΩ; triggers reset when pulled ≤0.3×VCC |
| 5 - VCC | Power supply input | Accepts 2.7V to 3.6V (for R-suffix); powers internal comparator, timer, and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| Preprogrammed 2.63V reset threshold | Eliminates external resistor divider; reduces BOM count and layout area in +3.3V systems |
| Guaranteed reset assertion to VCC = 1V | Ensures deterministic behavior during battery backup or low-VCC recovery scenarios |
| Internal MR pullup resistor | Removes need for discrete pullup; simplifies manual reset switch implementation with no external parts |
| Complementary RESET/RESET outputs | Supports both legacy (active-low) and newer (active-high) µP reset architectures without level-shifting |
| 140ms minimum power-on reset | Meets JEDEC JESD78 reliability requirements for reset pulse width in safety-critical applications |
Applications
| Automotive Engine Control Units | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring 3.3V microcontroller supply in engine ECU exposed to wide temperature swings and load dump transients. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset during cold cranking (VCC dip to 2.5V) and hot idle (125°C ambient). Use Value: Prevents erratic code execution by guaranteeing 200ms reset hold time and validating reset state down to 1V VCC. | Use Scenario: Power supervision for ARM-based controller in DIN-rail mounted PLC with manual service reset capability. IC Role / Device Role / Timing Role: Dual-polarity reset generator interfacing with both legacy FPGA (active-low) and new MCU (active-high) reset inputs. Use Value: Enables single-component reset management across heterogeneous logic families while supporting field technician reset via front-panel switch. |
| Medical Infusion Pumps | Ruggedized Handheld Testers |
Use Scenario: Battery-powered infusion pump requiring fail-safe restart after low-battery brownout or user-initiated recalibration. IC Role / Device Role / Timing Role: Manual reset supervisor with 2.63V threshold aligned to Li-ion cell discharge curve and 6µA quiescent current. Use Value: Extends battery life >12 months in standby; internal MR pullup allows momentary switch interface without leakage-sensitive external resistors. | Use Scenario: Portable multimeter with auto-ranging microcontroller that must survive ESD events and cable-induced noise on reset lines. IC Role / Device Role / Timing Role: Immune supervisory circuit rejecting <100ns noise pulses on MR while asserting clean 200ms reset on VCC glitch. Use Value: Eliminates false resets from probe contact bounce or RF coupling, improving field reliability and calibration integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX825REUK+T | 2.63V → 2.63V (same threshold), identical SOT23-5 package and temperature range | No functional difference; R-suffix denotes same electrical spec per Maxim ordering guide | Select only if marking or traceability requirements mandate R-suffix variant |
| TPS3808G125DBVR | 2.63V threshold, 350ms reset timeout, 1.5µA IQ, SOT23-5, –40°C to +125°C | Lacks complementary RESET output; single active-low reset only | Choose when system uses only active-low reset and ultra-low IQ (<2µA) is critical |
Compared with MAX825MEUK+T, the MAX825REUK+T is electrically identical but differs in top-side marking; the TPS3808G125DBVR offers lower quiescent current but requires external logic inversion for active-high reset support, increasing design complexity and board area.
Availability
MAX825MEUK+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, medical infusion pumps, ruggedized handheld testers, and battery-powered instrumentation requiring stable component supply across extended temperature ranges.
Supply support for MAX825MEUK+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, automotive, communications, and computing markets.
The MAX823/MAX824/MAX825 family delivers integrated reset, watchdog, and manual reset functions in ultra-small packages for space-constrained embedded systems where reliability under voltage and thermal stress is critical.
FAQ
What is the exact reset threshold voltage of the MAX825MEUK+T?
The MAX825MEUK+T has a factory-trimmed reset threshold of 2.63V, with ±1.5% tolerance over –40°C to +125°C. This value is confirmed in the Reset Threshold Table of the official datasheet and applies specifically to the "R" suffix variant, which corresponds to the MAX825MEUK+T ordering code. The threshold remains stable across temperature due to a 40ppm/°C coefficient.
Does the MAX825MEUK+T include a watchdog timer function?
No, the MAX825MEUK+T does not include a watchdog timer. Per the Selector Guide and Pin Description section, the MAX825 variant provides manual reset input (MR) and complementary active-high reset (RESET), but explicitly omits the watchdog input (WDI) found in MAX823/MAX824. This makes MAX825MEUK+T ideal for applications requiring manual reset and dual-polarity reset outputs without watchdog overhead.
What is the supply current of the MAX825MEUK+T at +125°C?
The MAX825MEUK+T draws 6µA typical supply current at +125°C, as specified in the Electrical Characteristics table for SOT23-5 packaging. This value is measured with MR unconnected and applies across the full operating VCC range (2.7V to 3.6V). The low quiescent current supports long-term operation in battery-backed or energy-harvesting systems.
Can the MAX825MEUK+T drive a bidirectional microprocessor reset pin?
Yes, the MAX825MEUK+T can interface with bidirectional µP reset pins such as those on the 68HC11. Its RESET output sinks up to 3.2mA (at VCC = VRST min), allowing the µP to force the line low when needed, while the MAX825MEUK+T pulls it high with 150µA source current. This bidirectional compatibility is explicitly verified in the Applications Information section of the datasheet.
Is the MR pin of the MAX825MEUK+T internally pulled up, and what is its resistance value?
Yes, the MR pin of the MAX825MEUK+T includes an internal pullup resistor of 52kΩ (typical), with a range of 35kΩ to 75kΩ across temperature and process variation. This allows direct connection of a momentary switch from MR to GND without external components, and permits leaving MR open if unused - a feature confirmed in the Pin Description and Detailed Description sections of the datasheet.
MAX825MEUK+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:
- 4.38V
- 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
MAX825MEUK+T FAQ
1.How can I place an order for MAX825MEUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX825MEUK+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 MAX825MEUK+T reliable?
The price and inventory of MAX825MEUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX825MEUK+T is usually 5 days.
3.What payment methods are accepted for MAX825MEUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX825MEUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX825MEUK+T?
MAX825MEUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX825MEUK+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 MAX825MEUK+T?
For technical support, including MAX825MEUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX825MEUK+T requirements.
6.How does Aetrix verify that MAX825MEUK+T is sourced from the original manufacturer or authorized distributors?
All MAX825MEUK+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 MAX825MEUK+T meets industry standards.
7.What is the process for return or replacement of MAX825MEUK+T?
All MAX825MEUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX825MEUK+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 MAX825MEUK+T part is unused and in its original packaging.
Return procedure for MAX825MEUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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