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Analog Devices Inc./Maxim Integrated MAX825TEUK+T
- Part No.:
- MAX825TEUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX825TEUK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,269
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Product details
Overview
MAX825TEUK+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with manual reset input and active-high reset output, designed for precise +3.08V supply monitoring in industrial and automotive systems. It guarantees valid reset assertion down to VCC = 1V, features 140ms minimum power-on reset timeout, 2µA typical supply current (SC70), and operates across –40°C to +125°C.
For engineers reviewing the MAX825TEUK+T datasheet, MAX825TEUK+T pinout, MAX825TEUK+T application, or MAX825TEUK+T equivalent, key selection criteria include reset threshold accuracy (3.08V ±30mV), manual reset timing (500ns MR-to-reset delay), watchdog absence, and lead-free SOT23-5 packaging for high-temperature embedded control.
Technical Context
The MAX825TEUK+T implements a precision voltage comparator with 40ppm/°C temperature coefficient and 5mV hysteresis to detect brownout on +3.08V rails. Its internal reset timer ensures 140–280ms reset pulse width after VCC rise or MR deassertion, independent of supply voltage variation.
Unlike the MAX823/MAX824 variants, the MAX825TEUK+T omits watchdog functionality but includes an internal 52kΩ pullup on MR and complementary RESET/RESET outputs. It interfaces directly with bidirectional µP reset pins via 400µA max sink capability at VCC = 3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±30mV - precisely monitors +3.08V supplies without external components |
| Supply Current | 3µA typical (SOT23) - enables ultra-low-power operation in battery-backed systems |
| Reset Timeout | 140ms min - ensures reliable µP initialization during slow-ramping power supplies |
| Operating Temp | –40°C to +125°C - supports under-hood automotive and industrial control environments |
| VCC Range | +3.15V to +3.6V - matches nominal +3.3V rail tolerances with margin for ripple |
| MR Input Logic | 0.3×VCC low / 0.7×VCC high - compatible with standard CMOS logic drivers |
| RESET Sink | 1.2mA @ VCC = 3.6V - drives µP reset pins with sufficient margin for noise immunity |
Pinout & Package
MAX825TEUK+T uses a 5-pin SOT23-5 package (JEDEC MO-178AA), lead-free, with 1.3mm × 2.9mm footprint and 0.95mm height. Pin 1 marked by beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Positive Supply Input | Accepts +3.15V to +3.6V; powers internal comparator and timer |
| 2 (GND) | Ground Reference | Return path for all internal circuits; must be low-impedance for accurate threshold sensing |
| 3 (RESET) | Active-High Reset Output | Drives high when VCC ≥ 3.08V and MR inactive; asserts low during fault or MR activation |
| 4 (MR) | Manual Reset Input | Active-low; internally pulled up to VCC via 52kΩ; 1.0µs minimum pulse width required |
| 5 (RESET) | Active-Low Reset Output | Complementary to Pin 3; sinks 1.2mA at VCC = 3.6V for direct µP interface |
Key Features
| Feature | Design Value |
|---|---|
| Precision +3.08V Threshold | ±30mV tolerance over –40°C to +125°C enables stable reset without calibration |
| 140ms Min Reset Timeout | Guarantees µP core and peripherals fully initialize before code execution resumes |
| MR Internal Pullup | 52kΩ resistor eliminates need for external pullup, reducing BOM count and board space |
| VCC = 1V Reset Validity | Ensures deterministic reset state even during deep brownout or backup-battery operation |
| Complementary RESET Outputs | Supports both active-high and active-low µP reset inputs without level-shifting circuitry |
Applications
| Industrial PLC Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: Monitoring +3.3V power rails in programmable logic controllers exposed to wide ambient temperature swings and EMI. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset during brownout and enabling operator-initiated recovery via front-panel switch. Use Value: Prevents firmware corruption during unstable mains conditions using guaranteed 140ms reset hold time and 3.08V threshold matched to 3.3V LDO output. | Use Scenario: Power management in body control units where +3.3V MCU supply must survive load-dump transients and cold-crank voltage dips. IC Role / Device Role / Timing Role: Voltage supervisor providing fail-safe reset to ARM Cortex-M4 core during VCC sag below 3.08V. Use Value: Maintains reset assertion down to VCC = 1V, ensuring controlled shutdown during 6V cold-crank events without spurious resets. |
| Medical Diagnostic Handhelds | Smart Energy Meters |
Use Scenario: Battery-powered portable ultrasound devices requiring low-quiescent-current supervision of Li-ion regulated +3.3V rails. IC Role / Device Role / Timing Role: Low-power supervisory IC enabling manual reset via touchscreen controller GPIO and automatic reset on battery undervoltage. Use Value: 3µA typical supply current extends battery life; MR input allows software-triggered reinitialization without hardware button. | Use Scenario: Tamper-resistant electricity meters operating continuously on +3.3V rails derived from AC line or supercapacitor backup. IC Role / Device Role / Timing Role: Precision voltage monitor asserting reset during grid brownouts and supporting secure firmware update recovery via MR. Use Value: 40ppm/°C threshold drift ensures consistent trip point across –25°C to +70°C meter enclosure temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX825SEUK+T | 2.93V reset threshold; identical pinout, package, and timing | Suitable for +3.0V or lower nominal rails; same temp range and MR functionality | Select when system VCC nominal is 3.0V instead of 3.3V |
| TPS3808G30DBVR | 3.0V threshold, 350ms reset timeout, 1.8–6.0V VCC range, no complementary outputs | Lacks RESET/RESET dual outputs; requires external pullup on MR; higher quiescent current (1.1µA min) | Choose for broader VCC range and longer reset hold, accepting single-output interface |
Compared with MAX825TEUK+T, the MAX825SEUK+T offers identical architecture at a lower threshold for tighter 3.0V rail tolerance, while the TPS3808G30DBVR provides extended VCC flexibility and longer reset duration but sacrifices complementary outputs and MR pullup integration.
Availability
MAX825TEUK+T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and medical handheld diagnostics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX825TEUK+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, and communications applications.
The MAX823/MAX824/MAX825 family delivers compact, low-power microprocessor supervision with configurable reset thresholds and integrated manual reset, targeting space-constrained embedded systems needing high reliability.
FAQ
What is the exact reset threshold voltage for MAX825TEUK+T?
The MAX825TEUK+T has a factory-trimmed reset threshold of 3.08V with ±30mV tolerance over –40°C to +125°C. This value is specified in the Reset Threshold Table and confirmed in Electrical Characteristics under VRST for suffix "T", ensuring precise monitoring of +3.3V supply rails without external calibration.
Does MAX825TEUK+T include a watchdog timer function?
No, the MAX825TEUK+T does not include a watchdog timer. Per the Selector Guide and Functional Diagram, only MAX823 and MAX824 variants feature WDI input; the MAX825 series provides manual reset input and complementary reset outputs exclusively. This makes MAX825TEUK+T ideal for applications requiring reset control without software supervision overhead.
What is the supply current specification for MAX825TEUK+T at +25°C?
The MAX825TEUK+T draws 3µA typical supply current at +25°C in SOT23 package, as stated in the Electrical Characteristics table under ISUPPLY for MAX825T/S/R/Z/Y (SOT23 Only). This ultra-low quiescent current supports battery-powered and energy-sensitive applications without compromising reset accuracy.
How does the manual reset input (MR) behave on MAX825TEUK+T?
The MR input on MAX825TEUK+T is active-low with an internal 52kΩ pullup resistor. A logic-low pulse ≥1.0µs asserts reset, which remains active for 200ms after MR returns high. The input accepts standard CMOS levels (VIH = 0.7×VCC, VIL = 0.3×VCC) and requires no external components-enabling direct connection to switches or GPIOs.
Is MAX825TEUK+T compatible with bidirectional microprocessor reset pins?
Yes, MAX825TEUK+T is compatible with bidirectional µP reset pins such as those on the 68HC11. Its RESET output can sink 1.2mA at VCC = 3.6V, allowing the µP to override the supervisor's reset signal when needed. This capability is explicitly documented in the Applications Information section on interfacing with bidirectional reset pins.
MAX825TEUK+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:
- 3.08V
- 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
MAX825TEUK+T FAQ
1.How can I place an order for MAX825TEUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX825TEUK+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 MAX825TEUK+T reliable?
The price and inventory of MAX825TEUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX825TEUK+T is usually 5 days.
3.What payment methods are accepted for MAX825TEUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX825TEUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX825TEUK+T?
MAX825TEUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX825TEUK+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 MAX825TEUK+T?
For technical support, including MAX825TEUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX825TEUK+T requirements.
6.How does Aetrix verify that MAX825TEUK+T is sourced from the original manufacturer or authorized distributors?
All MAX825TEUK+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 MAX825TEUK+T meets industry standards.
7.What is the process for return or replacement of MAX825TEUK+T?
All MAX825TEUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX825TEUK+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 MAX825TEUK+T part is unused and in its original packaging.
Return procedure for MAX825TEUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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