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Analog Devices Inc./Maxim Integrated MAX825ZEXK
- Part No.:
- MAX825ZEXK
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX825ZEXK.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:3,246
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Product details
Overview
MAX825ZEXK from Maxim Integrated is a 5-pin 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 2.32V reset threshold, 2µA supply current (SC70 package), 140ms minimum reset timeout, guaranteed RESET validity down to VCC = 1V, and operates over -40°C to +85°C.
For engineers reviewing the MAX825ZEXK datasheet, MAX825ZEXK pinout, MAX825ZEXK application, or MAX825ZEXK equivalent, this device serves as a low-power, transient-immune supervisor for battery-powered instrumentation, automotive control modules, and industrial microcontroller systems requiring reliable brownout detection and operator-initiated reset capability.
Technical Context
The MAX825ZEXK implements a precision voltage comparator with 40ppm/°C temperature coefficient and 5mV hysteresis to detect VCC drops below its 2.32V threshold. Its internal reset timer ensures a minimum 140ms assertion of both active-low RESET and active-high RESET outputs after power-up or brownout recovery.
It integrates an internal 52kΩ pullup resistor on the MR pin, enabling direct connection to momentary switches without external components, and supports noise immunity via configurable MR pulse-width filtering (100ns minimum glitch rejection) and optional 0.1µF MR-to-GND capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32V ±3% - precisely monitors 2.5V rail brownout with 2.25V–2.38V operating range |
| Supply Current | 2µA typical (SC70) - enables multi-year operation in coin-cell–powered portable devices |
| Reset Timeout | 140–280ms - ensures µP initialization completes before release, compatible with ARM Cortex-M boot sequences | VCC Operating Range | 2.38V to 2.75V - matches low-voltage 2.5V system rails while maintaining reset assertion down to 1V |
| MR Input Logic | Active-low with 52kΩ internal pullup - eliminates external resistor; supports direct switch-to-GND or CMOS logic drive |
| RESET Output Drive | Sinks 1.2mA @ 0.3V (VCC = VRST min) - directly interfaces with µP reset pins requiring 1mA sink capability |
| Temperature Range | -40°C to +85°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
MAX825ZEXK is housed in a 5-pin SC70-5 package (2.0mm × 1.25mm × 0.9mm), optimized for space-constrained PCB layouts in portable electronics and sensor nodes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Positive supply input | Accepts 2.38V–2.75V; powers internal comparator, timer, and output drivers |
| 2 - GND | Ground reference | Return path for all internal circuits; must be low-impedance for accurate threshold sensing |
| 3 - RESET | Active-low reset output | Asserts low during power-up/brownout; holds low ≥140ms after VCC exceeds 2.32V |
| 4 - MR | Manual reset input | Active-low; resets µP when pulled low; internal 52kΩ pullup allows NC or VCC tie-off |
| 5 - RESET | Active-high reset output | Complementary to pin 3; provides logic-high reset signal for µPs requiring active-high assertion |
Key Features
| Feature | Design Value |
|---|---|
| 2.32V Precision Reset Threshold | Enables accurate supervision of 2.5V rails with ±3% tolerance and 40ppm/°C drift - critical for stable ADC reference and memory retention |
| 2µA SC70 Supply Current | Reduces quiescent power by >75% vs. SOT23 variants - extends battery life in always-on IoT edge sensors |
| Complementary RESET Outputs | Simultaneous active-low and active-high signals eliminate need for external inverters in mixed-logic systems |
| MR Internal Pullup Resistor | 52kΩ value permits direct switch interface with no BOM additions - simplifies layout and reduces test points |
| VCC Transient Immunity | Rejects negative-going glitches ≤100ns at 2.32V overdrive - prevents spurious resets in electrically noisy automotive CAN domains |
Applications
| Portable Medical Sensors | Automotive Body Control Modules |
|---|---|
Use Scenario: Wearable ECG patch monitoring battery voltage and user-initiated recalibration. IC Role / Device Role / Timing Role: Supervises 2.5V analog front-end supply and asserts dual-polarity reset to MSP430 MCU upon undervoltage or button press. Use Value: 2µA quiescent current enables >3-year CR2032 operation; MR pin accepts tactile switch without debounce circuitry. | Use Scenario: Door module detecting 2.5V rail collapse during load-dump transients. IC Role / Device Role / Timing Role: Monitors LIN bus power domain and triggers fail-safe shutdown via active-high RESET to Infineon AURIX TC3xx. Use Value: 2.32V threshold aligns with ISO 16750-2 Class D requirements; 140ms timeout satisfies UNECE R100 reset hold time. |
| Industrial PLC I/O Cards | Smart Energy Meters |
Use Scenario: DIN-rail mounted controller experiencing 2.5V DC-DC converter brownout during motor startup. IC Role / Device Role / Timing Role: Detects VCC dip below 2.32V and asserts synchronized RESET to STM32H7 to prevent firmware corruption. Use Value: Guaranteed RESET validity to 1V ensures deterministic behavior during deep brownout; SC70 footprint saves 40% board area vs. SOIC-8 alternatives. | Use Scenario: AMI meter with tamper-detection button and lithium-thionyl chloride primary cell. IC Role / Device Role / Timing Role: Provides manual reset via sealed membrane switch and monitors 2.5V RTC supply during battery swap. Use Value: Internal MR pullup eliminates external resistor - improves long-term reliability in high-humidity enclosures; 2.32V threshold avoids false trips during cold-temperature battery voltage sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX825REXK-T | 2.63V reset threshold; identical SC70-5 package, pinout, and timing | Targets 2.7V/2.8V rails instead of 2.5V; unsuitable where 2.32V precision is required for early brownout warning | Select MAX825ZEXK-T when supervising 2.5V supplies with tight margin; choose MAX825REXK-T for higher-threshold 2.7V systems. |
| TPS3808G12DBVR | 1.2V threshold, 1.8µA IQ, SOT23-5 - lacks complementary RESET output and MR internal pullup | Requires external pullup on MR and inverter for active-high reset; not drop-in for designs needing dual outputs | Use TPS3808G12DBVR only if redesigning for single-output architecture and lower threshold; MAX825ZEXK-T preserves existing dual-signal interface. |
Compared with MAX825REXK-T, MAX825ZEXK offers earlier brownout detection at 2.32V versus 2.63V - critical for preserving SRAM data in low-VCC conditions. Against TPS3808G12DBVR, MAX825ZEXK eliminates two external components (pullup + inverter) and guarantees reset assertion down to 1V, enhancing system robustness in deep undervoltage events.
Availability
MAX825ZEXK is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, and industrial PLC I/O cards requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX825ZEXK 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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX823/MAX824/MAX825 family delivers integrated reset, watchdog, and manual reset functions in ultra-small packages for space- and power-constrained microcontroller systems.
FAQ
What is the exact reset threshold voltage of the MAX825ZEXK?
The MAX825ZEXK has a factory-trimmed reset threshold of 2.32V, specified over temperature with ±3% tolerance and 40ppm/°C drift. This value is confirmed in the Reset Threshold Table of the official datasheet and applies exclusively to the Z-suffix variant in SC70 packaging. The MAX825ZEXK maintains this threshold across its full -40°C to +85°C operating range, ensuring consistent brownout detection for 2.5V power rails.
Does the MAX825ZEXK provide both active-low and active-high reset outputs?
Yes, the MAX825ZEXK provides two independent reset outputs: pin 3 is active-low RESET, and pin 5 is active-high RESET. This complementary pair eliminates the need for external inverters in systems requiring either polarity. Both outputs are asserted simultaneously during power-up, brownout, or manual reset events, with identical 140ms minimum timeout - a key differentiator from the MAX823 (watchdog-only) and MAX824 (watchdog + active-high) variants.
What is the supply current of the MAX825ZEXK and how does it vary with temperature?
The MAX825ZEXK draws 2µA typical supply current in SC70 packaging at +25°C, rising to 6µA maximum over the full -40°C to +85°C range. This ultra-low quiescent current is verified in the Electrical Characteristics table under "Supply Current (SC70 Only)" and enables multi-year operation in battery-powered applications. The MAX825ZEXK's current remains stable across temperature due to BiCMOS process optimization - unlike discrete solutions that exhibit exponential leakage increase.
Can the manual reset input (MR) of the MAX825ZEXK be left unconnected?
Yes, the MR pin of the MAX825ZEXK features an internal 52kΩ pullup resistor, allowing it to be left unconnected (NC) or tied to VCC if manual reset functionality is unused. When driven externally, MR accepts standard CMOS logic levels (VIH = 0.7×VCC, VIL = 0.3×VCC) and rejects noise pulses <100ns. This integrated pullup removes the need for external components - a design advantage confirmed in the Pin Description and Applications Information sections of the MAX825ZEXK datasheet.
Is the MAX825ZEXK pin-compatible with other members of the MAX823/MAX824/MAX825 family?
Yes, the MAX825ZEXK shares identical SC70-5 pinout and footprint with all MAX823/MAX824/MAX825 variants in the same package, including MAX825REXK-T and MAX825TEXK-T. Pin assignments (VCC, GND, RESET, MR, RESET) are fixed across the family, enabling direct substitution when reset threshold and functional features (e.g., watchdog presence) align. However, MAX823/MAX824 variants include WDI functionality absent in MAX825ZEXK, so functional compatibility must be verified per application requirements.
MAX825ZEXK 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:
- 2.32V
- 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
MAX825ZEXK FAQ
1.How can I place an order for MAX825ZEXK through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX825ZEXK 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 MAX825ZEXK reliable?
The price and inventory of MAX825ZEXK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX825ZEXK is usually 5 days.
3.What payment methods are accepted for MAX825ZEXK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX825ZEXK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX825ZEXK?
MAX825ZEXK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX825ZEXK 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 MAX825ZEXK?
For technical support, including MAX825ZEXK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX825ZEXK requirements.
6.How does Aetrix verify that MAX825ZEXK is sourced from the original manufacturer or authorized distributors?
All MAX825ZEXK 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 MAX825ZEXK meets industry standards.
7.What is the process for return or replacement of MAX825ZEXK?
All MAX825ZEXK units undergo pre-shipment inspection (PSI). If there is an issue with MAX825ZEXK, 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 MAX825ZEXK part is unused and in its original packaging.
Return procedure for MAX825ZEXK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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