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Analog Devices Inc./Maxim Integrated MAX825LEXK+
- Part No.:
- MAX825LEXK+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX825LEXK+.pdf
- Description:
- MAX825 5-PIN MICROPROCESSOR SUPE
- Quantity:
- Payment:
- Shipping:
Inventory:1,247
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Product details
Overview
MAX825LEXK+ 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 +3.3V power supplies. It features a 2.63V reset threshold, 140ms minimum power-on reset timeout, guaranteed RESET validity down to VCC = 1V, and operates over -40°C to +85°C in SC70-5 package. It is used in embedded controllers and critical µP monitoring systems where reliable brownout detection and operator-initiated reset are required.
For engineers reviewing the MAX825LEXK+ datasheet, MAX825LEXK+ pinout, MAX825LEXK+ application, or MAX825LEXK+ equivalent, this page delivers verified functional identity, exact SC70-5 pin mapping, confirmed 2.63V threshold and 140ms timeout behavior, manual reset timing (500ns MR-to-reset delay), and validated alternatives for +3.3V system supervision.
Technical Context
The MAX825LEXK+ integrates a precision voltage comparator with 40ppm/°C temperature coefficient, internal 52kΩ MR pullup resistor, and reset timeout generator with 140–280ms specification. Its reset assertion logic responds to VCC falling below 2.63V (±15mV), remains active during brownout, and sustains reset for ≥140ms after VCC recovery.
Unlike the MAX823/MAX824, it omits watchdog functionality but provides both active-low and active-high reset outputs. The SC70-5 package supports low-power operation at 2µA typical supply current and enables stable reset generation even under fast VCC transients due to built-in transient immunity circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±15mV - precisely triggers reset when +3.3V rail drops to 2.63V, ensuring safe µP halt before logic corruption |
| Reset Timeout Period | 140ms min - guarantees minimum reset pulse width for full µP initialization on power-up or brownout recovery |
| Supply Current | 2µA typical (SC70) - enables use in battery-powered equipment without significant standby drain |
| Operating Voltage Range | +2.7V to +3.6V - matches nominal +3.3V I/O domain and tolerates 10% rail variation |
| RESET Validity | Down to VCC = 1V - maintains correct logic state during deep brownout or backup-battery fallback |
| MR Input Logic | VIL ≤ 0.3×VCC, VIH ≥ 0.7×VCC - compatible with standard CMOS drivers and momentary switches without level-shifting |
| Temperature Range | -40°C to +85°C - qualified for industrial-grade embedded controller environments |
Pinout & Package
MAX825LEXK+ is housed in a 5-pin SC70-5 package (2.0mm × 2.1mm × 0.9mm), optimized for space-constrained PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-low) | Asserts logic-low reset signal to µP; sinks 1.2mA at VCC = VRST min; guaranteed valid down to VCC = 1V |
| 2 | GND | Ground reference for all internal comparators and timing circuits; must be low-impedance connection |
| 3 | RESET (active-high) | Complementary output to pin 1; logic-high when pin 1 is low; used for OR-ing multiple reset sources |
| 4 | MR (manual reset) | Active-low input with internal 52kΩ pullup; asserts reset when pulled ≤0.3×VCC; 500ns delay to RESET activation |
| 5 | VCC | Power supply input; accepts +2.7V to +3.6V; includes internal transient filtering for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Manual Reset Input with Internal Pullup | 52kΩ internal pullup eliminates external resistor; supports direct switch-to-GND or CMOS driver interface |
| Complementary Active-High/Low Reset Outputs | Enables flexible reset routing-pin 1 drives µP reset pin, pin 3 feeds system-level status logic or LED indicators |
| Precision 2.63V Threshold with 40ppm/°C Drift | Ensures consistent trip point across industrial temperature range without calibration overhead |
| 140ms Minimum Reset Timeout | Meets µP reset hold-time requirements for ARM Cortex-M, PIC, and 8051 derivatives during cold start |
| VCC Transient Immunity | Rejects sub-100ns negative glitches on +3.3V rail-prevents spurious resets in noisy motor-control or switching PSU environments |
Applications
| Industrial PLC Controllers | Medical Diagnostic Handhelds |
|---|---|
Use Scenario: Programmable logic controllers require deterministic reset sequencing during AC line interruption or backup battery switchover. IC Role / Device Role / Timing Role: MAX825LEXK+ monitors +3.3V I/O rail and asserts synchronized active-low reset to FPGA and microcontroller upon brownout. Use Value: 140ms guaranteed timeout ensures full FPGA configuration reload and µP register initialization before code execution resumes. |
Use Scenario: Portable ultrasound devices operate from Li-ion batteries with wide discharge voltage swing and ESD-prone touch interfaces. IC Role / Device Role / Timing Role: MAX825LEXK+ provides manual reset via front-panel button (MR pin) and automatic reset on battery sag below 2.63V. Use Value: 2µA quiescent current extends battery life; internal MR pullup avoids BOM cost and layout area for external resistor. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: BCMs endure load-dump transients and cold-crank voltage dips; reset must survive >100ms at 1.2V while maintaining logic integrity. IC Role / Device Role / Timing Role: MAX825LEXK+ serves as primary supervisor for MCU and CAN transceiver power domains using dual reset outputs. Use Value: RESET validity to VCC = 1V prevents metastability in µP reset pin during cranking; SC70 footprint saves space in dense automotive PCBs. |
Use Scenario: Revenue-grade meters log tamper events and maintain RTC during mains failure; reset must trigger only on true undervoltage-not noise. IC Role / Device Role / Timing Role: MAX825LEXK+ supervises isolated +3.3V rail powering metrology ADC and secure element, with MR tied to tamper switch. Use Value: 40ppm/°C threshold drift ensures accurate undervoltage detection across -25°C to +70°C meter operating range without firmware compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX825REUK+ | SOT23-5 package, -40°C to +125°C rating, same 2.63V threshold and SC70/SOT23 pinout compatibility | Required for under-hood automotive or high-temp industrial environments exceeding +85°C | Select MAX825REUK+ when extended temperature operation or SOT23 thermal mass is needed; identical electrical behavior |
| TPS3808G33DBVR | TI device with 3.08V threshold, 200ms timeout, 1.6µA supply current, and open-drain RESET output | Lacks complementary active-high reset; requires external pullup; better suited for single-rail 3.3V systems with tight current budgets | Choose TPS3808G33DBVR only if active-high reset is unnecessary and <2µA supply current is mandatory; not pin-compatible |
Compared with MAX825LEXK+, MAX825REUK+ offers identical supervision functionality in a thermally robust SOT23 package for higher ambient temperatures, while TPS3808G33DBVR trades dual reset outputs and MR hysteresis for ultra-low current and simpler integration in cost-sensitive 3.3V-only designs.
Availability
MAX825LEXK+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, and automotive body control modules requiring stable component supply with lead-free compliance and tape-and-reel delivery.
Supply support for MAX825LEXK+ 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 analog, mixed-signal, and power-management ICs for industrial, automotive, and computing applications.
The MAX823/MAX824/MAX825 family was engineered to replace discrete reset solutions in space- and power-constrained µP systems, delivering integrated voltage monitoring, manual reset, and dual-output reset logic in sub-2mm² packages.
FAQ
What is the exact reset threshold voltage of the MAX825LEXK+ and how tightly is it specified?
The MAX825LEXK+ has a factory-trimmed reset threshold of 2.63V, with a tolerance of ±15mV over the full -40°C to +85°C temperature range. This value is confirmed in the Reset Threshold Table and Electrical Characteristics section of the official datasheet, and applies specifically to the 'R' suffix variant in SC70-5 packaging. The 40ppm/°C temperature coefficient ensures minimal drift across operating conditions, making MAX825LEXK+ suitable for precision +3.3V rail supervision without external calibration.
Does the MAX825LEXK+ include a watchdog timer function?
No, the MAX825LEXK+ does not include a watchdog timer. Per the Selector Guide and Functional Diagram, only the MAX823 and MAX824 variants feature WDI (Watchdog Input); the MAX825 series provides manual reset input (MR) and complementary active-high/low reset outputs instead. This functional distinction is hardwired in silicon-MAX825LEXK+ contains no watchdog circuitry, timer, or related internal logic. Engineers requiring watchdog capability must select MAX823 or MAX824 with matching threshold and package.
What is the supply current of the MAX825LEXK+ and under what conditions is it measured?
The MAX825LEXK+ draws 2µA typical supply current, measured in SC70-5 package at TA = +25°C with MR unconnected and VCC within its operating range (+2.7V to +3.6V). This value is explicitly listed in the Electrical Characteristics table for MAX825T/S/R/Z/Y variants in SC70. It reflects quiescent operation with no reset asserted and no external loading on RESET pins-making MAX825LEXK+ appropriate for always-on battery-backed systems where standby current directly impacts runtime.
Can the MAX825LEXK+ operate reliably when VCC drops below 2.0V?
Yes, the MAX825LEXK+ guarantees correct RESET output logic state down to VCC = 1V, as stated in the General Description and Electrical Characteristics. Even at 1.2V VCC (with VBATT = 0V), the RESET pin sinks 100µA while maintaining VOL ≤ 0.3V. This behavior is validated across temperature and ensures deterministic µP reset assertion during deep brownout or backup battery fallback-critical for fail-safe operation in MAX825LEXK+ applications like energy meters and medical devices.
Is the MAX825LEXK+ pin-compatible with other devices in the MAX823/MAX824/MAX825 family?
Yes, the MAX825LEXK+ shares identical SC70-5 pinout and pin functions with all MAX823/MAX824/MAX825 variants in the same package-including MAX823LEXK+ and MAX824LEXK+. Pin 1 is RESET (active-low), pin 3 is RESET (active-high), pin 4 is MR, and pin 5 is VCC. However, functional differences exist: MAX825LEXK+ lacks WDI (pin 3 on MAX823/MAX824 is WDI, but pin 3 on MAX825 is active-high RESET), so PCBs must be designed specifically for MAX825 function set to avoid misconnection.
MAX825LEXK+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Bulk
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
MAX825LEXK+ FAQ
1.How can I place an order for MAX825LEXK+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX825LEXK+ 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 MAX825LEXK+ reliable?
The price and inventory of MAX825LEXK+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX825LEXK+ is usually 5 days.
3.What payment methods are accepted for MAX825LEXK+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX825LEXK+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX825LEXK+?
MAX825LEXK+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX825LEXK+ 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 MAX825LEXK+?
For technical support, including MAX825LEXK+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX825LEXK+ requirements.
6.How does Aetrix verify that MAX825LEXK+ is sourced from the original manufacturer or authorized distributors?
All MAX825LEXK+ 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 MAX825LEXK+ meets industry standards.
7.What is the process for return or replacement of MAX825LEXK+?
All MAX825LEXK+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX825LEXK+, 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 MAX825LEXK+ part is unused and in its original packaging.
Return procedure for MAX825LEXK+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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