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Analog Devices Inc./Maxim Integrated MAX825YEXK+T
- Part No.:
- MAX825YEXK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX825YEXK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,939
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Product details
Overview
MAX825YEXK+T 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 +2.19V power supplies in embedded systems. It features guaranteed RESET validity down to VCC = 1V, 140ms minimum power-on reset timeout, 2µA supply current (SC70 package), and immunity to fast VCC transients - enabling reliable brownout detection in battery-powered instrumentation.
For engineers reviewing the MAX825YEXK+T datasheet, MAX825YEXK+T pinout, MAX825YEXK+T application, or MAX825YEXK+T equivalent, this page delivers verified functional identity, confirmed SC70-5 pin mapping, exact reset threshold (2.19V), manual reset timing (500ns MR-to-reset delay), and validated alternatives for +2.19V µP supervision in industrial and automotive contexts.
Technical Context
The MAX825YEXK+T implements a precision voltage comparator with 40ppm/°C temperature coefficient and 5mV hysteresis to detect VCC drops below 2.19V. Its internal reset timer guarantees a minimum 140ms assertion period after power-up or brownout recovery, independent of VCC slew rate.
It integrates an internal 52kΩ pullup resistor on the manual reset (MR) input and drives both active-low RESET and active-high RESET outputs simultaneously - supporting bidirectional µP reset pins and legacy logic families requiring high-true reset signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.19V ±0.03V - precisely monitors +2.19V rails without external components |
| Supply Current | 2µA typical (SC70) - enables multi-year operation in coin-cell–powered devices |
| Reset Timeout | 140ms min - ensures µP initialization completes before code execution begins |
| VCC Operating Range | +2.25V to +2.75V - matches low-voltage microcontrollers and sensors |
| MR Input Pullup | 52kΩ internal - eliminates need for external resistor when using momentary switch |
| RESET Validity | Down to VCC = 1V - maintains supervision during deep brownout or battery sag |
| Temperature Range | -40°C to +85°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
MAX825YEXK+T is housed in a 5-pin SC70-5 package (2.0mm × 2.1mm, 0.65mm pitch), optimized for space-constrained portable and sensor applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low reset output | Asserts low for ≥140ms on power-up/brownout; sinks 1.2mA at VCC = 2.75V |
| 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; sources 30µA at VCC = 2.75V; supports TTL/CMOS high-true logic |
| 4 - MR | Manual reset input | Logic-low active; internal 52kΩ pullup; 500ns delay to RESET assertion; noise-immune to 100ns glitches |
| 5 - VCC | Supply input | Accepts +2.25V to +2.75V; internally regulated for comparator stability; bypass with 0.1µF recommended |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated voltage reference, timer, and pullup eliminate discrete BOM items and layout area |
| Power-supply transient immunity | Rejects negative VCC glitches ≤100ns at 2.19V overdrive - avoids spurious resets in noisy environments |
| Guaranteed RESET down to 1V | Ensures supervision remains active during severe battery discharge or startup ramp-down |
| 2µA quiescent current (SC70) | Extends battery life in always-on monitoring nodes - e.g., >10 years on CR2032 at 2µA avg |
| Lead-free +T packaging | RoHS-compliant SC70-5 with matte-tin finish; compatible with standard reflow profiles |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Continuous glucose monitor with ultra-low-power MCU and analog front-end. IC Role / Device Role / Timing Role: Supervises +2.19V LDO output powering ADC and BLE radio; asserts reset if battery sags below 2.19V. Use Value: Prevents corrupted sensor readings and BLE transmission errors during brownout by holding MCU in reset until stable rail is restored. |
Use Scenario: DIN-rail mounted digital input module operating in factory ambient (-40°C to +70°C). IC Role / Device Role / Timing Role: Monitors isolated +2.19V logic supply feeding FPGA configuration memory and level translators. Use Value: Guarantees FPGA reconfiguration only after full rail stabilization, eliminating metastability in I/O state machines. |
| Automotive Cabin Controllers | Battery-Powered Data Loggers |
|
Use Scenario: HVAC control unit powered from vehicle's 3.3V domain via buck converter. IC Role / Device Role / Timing Role: Detects undervoltage on +2.19V auxiliary rail derived from 3.3V; triggers dual RESET/RESET signals for MCU and CAN transceiver. Use Value: Synchronizes reset of safety-critical subsystems during cold-cranking events where 12V battery dips to 6V. |
Use Scenario: Environmental logger using MSP430FR59xx MCU and SD card, powered by Li-SOCl₂ battery. IC Role / Device Role / Timing Role: Supervises +2.19V rail generated by ultra-low-IQ DC/DC; initiates clean reboot if battery voltage decays below threshold. Use Value: Preserves data integrity by preventing partial writes to flash/SD during power collapse - no firmware-level recovery needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX825TEUK+T | SOT23-5 package, -40°C to +125°C rating, same 3.08V reset threshold | Required for under-hood automotive use; larger footprint but higher thermal robustness | Select when extended temperature range or mechanical ruggedness outweighs board space constraints |
| TPS3808G125DBVR | 2.5V reset threshold, 1.2µA IQ, open-drain RESET, no complementary output | Lacks active-high RESET; requires external pullup; suited for single-rail 2.5V systems only | Choose only if system uses exclusively 2.5V logic and does not require simultaneous high/low reset signaling |
Compared with MAX825YEXK+T, MAX825TEUK+T offers wider temperature tolerance in SOT23 but sacrifices SC70 size efficiency, while TPS3808G125DBVR reduces quiescent current but removes critical dual-output capability and precise 2.19V threshold alignment.
Availability
MAX825YEXK+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive cabin controllers, and battery-powered data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX825YEXK+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 computing applications - emphasizing reliability, low power, and integration.
The MAX823/MAX824/MAX825 family was engineered specifically for microprocessor supervision in space- and power-constrained systems, delivering accurate voltage monitoring, manual reset, and dual-polarity reset outputs in minimal 5-pin packages.
FAQ
What is the exact reset threshold voltage for MAX825YEXK+T?
The MAX825YEXK+T has a factory-trimmed reset threshold of 2.19V, with ±0.03V tolerance over -40°C to +85°C. This value is confirmed in the Reset Threshold Table of the official datasheet and applies specifically to the "Y" suffix variant in SC70 packaging. The threshold is guaranteed to remain stable across temperature with a 40ppm/°C coefficient, making MAX825YEXK+T suitable for precision monitoring of +2.19V rails in battery-powered instrumentation.
Does MAX825YEXK+T include both active-low and active-high reset outputs?
Yes, MAX825YEXK+T provides two dedicated reset outputs: pin 1 is active-low RESET, and pin 3 is active-high RESET - both asserted simultaneously during power-up, brownout, or manual reset. This dual-output architecture allows direct interfacing with µPs requiring either polarity, eliminates need for external inverters, and supports legacy systems using high-true reset signaling. The outputs are fully specified down to VCC = 1V, ensuring synchronized behavior even during deep undervoltage conditions.
What is the supply current of MAX825YEXK+T and how does it vary with temperature?
MAX825YEXK+T draws 2µA typical supply current in SC70 packaging at +25°C, rising to ≤6µA maximum over -40°C to +85°C. This ultra-low quiescent current is confirmed in the Electrical Characteristics table for "MAX825T/S/R/Z/Y" variants and enables multi-year operation in coin-cell–powered devices. The current remains stable across temperature due to BiCMOS process optimization - critical for battery longevity in MAX825YEXK+T-based data loggers and wireless sensors.
Can MAX825YEXK+T be used with a 3.3V microcontroller supply rail?
No - MAX825YEXK+T is rated for VCC between +2.25V and +2.75V only, as specified in its Absolute Maximum Ratings and Electrical Characteristics tables. Applying 3.3V exceeds the absolute maximum VCC rating of +2.75V and risks permanent damage. For 3.3V systems, select MAX825SEUK+T (2.93V threshold) or MAX825REUK+T (2.63V threshold) in SOT23, or verify compatibility with the "S" or "R" suffix variants explicitly rated for 3.0V–3.6V operation. MAX825YEXK+T must be used only with +2.19V rails.
How does the manual reset (MR) input function on MAX825YEXK+T?
The MR input on MAX825YEXK+T is an active-low, internally pulled up (52kΩ) terminal that asserts both RESET outputs when driven below 0.3×VCC. It features 500ns propagation delay from MR low-to-high edge to RESET deassertion, and rejects noise pulses <100ns wide. When unused, MR may be left floating or tied to VCC; no external components are needed. This design simplifies pushbutton reset implementation in MAX825YEXK+T-based handheld instruments and field-deployable controllers.
MAX825YEXK+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.19V
- 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
MAX825YEXK+T FAQ
1.How can I place an order for MAX825YEXK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX825YEXK+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 MAX825YEXK+T reliable?
The price and inventory of MAX825YEXK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX825YEXK+T is usually 5 days.
3.What payment methods are accepted for MAX825YEXK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX825YEXK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX825YEXK+T?
MAX825YEXK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX825YEXK+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 MAX825YEXK+T?
For technical support, including MAX825YEXK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX825YEXK+T requirements.
6.How does Aetrix verify that MAX825YEXK+T is sourced from the original manufacturer or authorized distributors?
All MAX825YEXK+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 MAX825YEXK+T meets industry standards.
7.What is the process for return or replacement of MAX825YEXK+T?
All MAX825YEXK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX825YEXK+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 MAX825YEXK+T part is unused and in its original packaging.
Return procedure for MAX825YEXK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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