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Analog Devices Inc./Maxim Integrated MAX825MEXK+
- Part No.:
- MAX825MEXK+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX825MEXK+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,944
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Product details
Overview
MAX825MEXK+ from Maxim Integrated is a 5-pin microprocessor supervisory circuit with manual reset input and complementary active-high reset output, designed for precision monitoring of +3.08V power supplies in embedded systems. It guarantees valid reset assertion down to VCC = 1V, features 140ms minimum power-on reset timeout, 2µA supply current (SC70 package), and immunity to fast VCC transients.
For engineers reviewing the MAX825MEXK+ datasheet, MAX825MEXK+ pinout, MAX825MEXK+ application, or MAX825MEXK+ equivalent, this device supports critical µP monitoring in portable equipment, automotive systems, and intelligent instruments where low-power, temperature-stable reset threshold (2.93V ±5mV hysteresis) and noise-immune manual reset are required.
Technical Context
The MAX825MEXK+ implements a precision voltage comparator with 40ppm/°C temperature coefficient and internal 52kΩ pullup on MR, enabling direct CMOS-switch interfacing without external components. Its reset generator ensures monotonic behavior during VCC ramp-up and brownout recovery, with propagation delay under 20µs at VCC falling through VRST.
Unlike the MAX823/MAX824, the MAX825MEXK+ excludes watchdog functionality but includes both active-low RESET and active-high RESET outputs, supporting bidirectional µP reset pins and dual-signaling system architectures. The SC70-5 package supports operation from -40°C to +85°C with guaranteed reset validity at VCC ≥ 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±0.05V - precisely monitors +3.0V–+3.3V rails with minimal undervoltage risk |
| Supply Current | 2µA (typ) - enables multi-year battery life in portable/battery-powered equipment |
| Reset Timeout | 140–280ms - ensures reliable µP initialization across full temperature range |
| VCC Range | +3.0V to +3.6V - matches standard 3.3V logic supply with 10% margin |
| MR Input Logic | VIL ≤ 0.3×VCC, VIH ≥ 0.7×VCC - compatible with 3.3V CMOS I/O without level shifting |
| RESET Propagation Delay | 20µs max - guarantees fast response to brownout events below reset threshold |
| Operating Temp | -40°C to +85°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
MAX825MEXK+ uses the SC70-5 surface-mount package (1.6mm × 1.6mm × 0.9mm), optimized for space-constrained portable and automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-low) | Open-drain output asserted low during power-up, brownout, or MR activation; sinks 1.2mA min at VCC = VRST min |
| 2 | GND | Ground reference for all internal comparators and reset timing circuits |
| 3 | RESET (active-high) | Complementary push-pull output - high when RESET is low, low when RESET is high |
| 4 | MR (manual reset) | Active-low input with internal 52kΩ pullup; asserts reset for ≥1µs pulse width, immune to <100ns noise |
| 5 | VCC | Power supply input; operates over +3.0V to +3.6V with transient immunity up to 200µs at 100mV overdrive |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.93V reset threshold | Enables accurate supervision of 3.0V/3.3V rails without external resistor dividers |
| 2µA quiescent current (SC70) | Extends battery life in portable devices beyond 10 years at 10µA system sleep current |
| Guaranteed RESET validity to VCC = 1V | Ensures deterministic reset state during deep brownout or backup-battery switchover |
| Internal MR pullup (52kΩ) | Eliminates need for external pullup resistor; supports direct switch-to-ground interface |
| No external components required | Reduces BOM count and PCB area vs. discrete reset solutions or RC-based supervisors |
Applications
| Portable/Battery-Powered Equipment | Automotive Systems |
|---|---|
Use Scenario: Power management in handheld medical monitors with coin-cell backup. IC Role / Device Role / Timing Role: Supervises main 3.3V LDO output and triggers controlled shutdown when VCC drops below 2.93V. Use Value: 2µA supply current extends operational life between battery replacements; 140ms reset timeout prevents spurious reboots during brief load transients. | Use Scenario: Engine control unit (ECU) cold-cranking voltage monitoring. IC Role / Device Role / Timing Role: Detects brownout during cranking (VCC dip to ~2.8V) and holds µP in reset until stable 3.3V rail resumes. Use Value: Immunity to <200µs negative transients avoids false resets during starter motor engagement; -40°C to +85°C rating ensures reliability in under-hood conditions. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Calibration-grade multimeter with isolated µP and analog front-end. IC Role / Device Role / Timing Role: Provides synchronized active-low and active-high reset signals to coordinate µP and FPGA startup sequencing. Use Value: Complementary RESET/RESET outputs eliminate need for external inverters; 40ppm/°C threshold drift maintains accuracy across operating temperature range. | Use Scenario: Industrial PLC controller requiring fail-safe boot integrity. IC Role / Device Role / Timing Role: Monitors 3.3V I/O supply and asserts reset if voltage sags below 2.93V for >140ms, preventing corrupted firmware execution. Use Value: Guaranteed reset assertion down to VCC = 1V ensures deterministic behavior even during capacitor discharge phases; MR pin allows field-service forced reset via front-panel button. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX825TEXK+ | Same SC70-5 package and pinout; reset threshold 3.08V instead of 2.93V | Suitable for +3.3V systems requiring higher trip point to avoid nuisance resets near rail tolerance limits | Select when system VCC nominal is 3.3V ±3% and brownout margin must exceed 250mV |
| TPS3808G33DBVR | 3.3V fixed threshold, 1.8µA IQ, SOT23-5 package; no complementary reset output | Lacks active-high RESET pin; requires external inverter for dual-signaling architectures | Choose for cost-sensitive designs where only active-low reset is needed and PCB space permits SOT23-5 |
Compared with MAX825MEXK+, MAX825TEXK+ offers higher reset threshold for tighter 3.3V rail margins, while TPS3808G33DBVR reduces quiescent current slightly but sacrifices complementary output capability and requires layout adaptation for dual-signaling use cases.
Availability
MAX825MEXK+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, automotive systems, and intelligent instruments requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for MAX825MEXK+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.
The MAX823/MAX824/MAX825 family was designed specifically for microprocessor supervision in space- and power-constrained systems, delivering precision reset thresholds, ultra-low quiescent current, and robust transient immunity in miniature SC70/SOT23 packages.
FAQ
What is the exact reset threshold voltage of the MAX825MEXK+?
The MAX825MEXK+ has a factory-trimmed reset threshold of 2.93V, with ±5mV hysteresis and ±40ppm/°C temperature coefficient. This value is guaranteed over the full -40°C to +85°C operating range and applies specifically to the "S" suffix variant in the MAX825 series, as confirmed in the Reset Threshold Table of the official datasheet.
Does the MAX825MEXK+ include a watchdog timer function?
No, the MAX825MEXK+ 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 (RESET), but explicitly omits the WDI pin and watchdog circuitry present in the MAX823/MAX824 variants. This makes MAX825MEXK+ ideal for applications requiring only precise voltage supervision and manual reset control.
What is the supply current specification for MAX825MEXK+ and under what conditions is it measured?
The MAX825MEXK+ draws 2µA typical supply current, measured in SC70-5 package with MR unconnected and TA = +25°C. The datasheet specifies 2µA (min) to 6µA (max) over temperature, confirming its suitability for ultra-low-power applications such as battery-backed instrumentation and portable medical devices where multi-year operation is required.
Can the MAX825MEXK+ operate reliably when VCC falls below 2.0V?
Yes, the MAX825MEXK+ guarantees valid reset output down to VCC = 1V, as stated in the General Description and Electrical Characteristics tables. During VCC ramp-down, RESET remains asserted until VCC reaches 1V, ensuring deterministic µP behavior during deep brownout or backup power transitions - a key differentiator versus competitors with 1.8V or higher minimum operating voltage.
What package type and lead finish does MAX825MEXK+ use, and how is lead-free compliance indicated?
The MAX825MEXK+ uses the SC70-5 package with lead-free (RoHS-compliant) finish. The "+" in the part number explicitly denotes lead-free packaging per Maxim's ordering convention; replacing "-T" with "+T" in the base part number indicates lead-free qualification, and the device meets JEDEC J-STD-020 moisture sensitivity level 1 requirements for reflow compatibility.
MAX825MEXK+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- Output:
- Open Drain or Open Collector
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
MAX825MEXK+ FAQ
1.How can I place an order for MAX825MEXK+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX825MEXK+ 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 MAX825MEXK+ reliable?
The price and inventory of MAX825MEXK+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX825MEXK+ is usually 5 days.
3.What payment methods are accepted for MAX825MEXK+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX825MEXK+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX825MEXK+?
MAX825MEXK+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX825MEXK+ 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 MAX825MEXK+?
For technical support, including MAX825MEXK+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX825MEXK+ requirements.
6.How does Aetrix verify that MAX825MEXK+ is sourced from the original manufacturer or authorized distributors?
All MAX825MEXK+ 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 MAX825MEXK+ meets industry standards.
7.What is the process for return or replacement of MAX825MEXK+?
All MAX825MEXK+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX825MEXK+, 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 MAX825MEXK+ part is unused and in its original packaging.
Return procedure for MAX825MEXK+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX825MEXK+ Tags
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