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Analog Devices Inc./Maxim Integrated MAX6725KASVD3
- Part No.:
- MAX6725KASVD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6725KASVD3.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,424
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Product details
Overview
MAX6725KASVD3 from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (4.625V factory-trimmed threshold) and VCC2 (3.075V threshold) with 210ms reset timeout, manual-reset input, and watchdog disable capability. It asserts active-low open-drain RST when either supply drops below threshold and maintains reset for ≥210ms after recovery - used in telecom power sequencing and industrial controller brownout protection.
For engineers reviewing the MAX6725KASVD3 datasheet, MAX6725KASVD3 pinout, MAX6725KASVD3 application, or MAX6725KASVD3 equivalent, key selection criteria include guaranteed reset validity down to VCC1/VCC2 = 0.8V, 14µA typical supply current at 3.6V, immunity to sub-100ns VCC transients, and compatibility with bidirectional µP reset I/O via 4.7kΩ series resistor.
Technical Context
The MAX6725KASVD3 implements dual independent voltage comparators with hysteresis (0.5% of VTH), internal 20ppm/°C tempco, and a digital timeout counter triggered by VCC1/VCC2 undervoltage, MR assertion, or watchdog timeout. Its reset logic guarantees correct output state even when VCC1 or VCC2 remains ≥0.8V - enabling reliable operation during deep brownout conditions.
It features an internal 50kΩ pullup on MR, supports CMOS-level manual reset with 1µs minimum pulse width and 100ns glitch rejection, and provides watchdog disable via floating WDI pin using a 200nA unconnected-state detector - eliminating need for external pullup/down while preventing false triggers from leakage sources >50nA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed falling threshold; ensures reset assertion before 5V rail collapse affects µP core logic) |
| VCC2 Threshold | 3.075V (factory-trimmed falling threshold; matches common I/O supply rails in industrial controllers) |
| Reset Timeout | 210ms (minimum duration; allows full µP boot sequence completion before release) |
| Supply Current | 14µA typical at 3.6V (enables battery-backed systems to maintain supervision >1 year on coin cell) |
| Reset Validity | Down to VCC1 or VCC2 = 0.8V (guaranteed logic state retention during severe brownout, no external pulldown needed) |
| MR Input | Internal 50kΩ pullup to VCC1; accepts CMOS levels; 1µs pulse width sufficient for mechanical switch debounce |
| WDI Disable | Floating WDI pin disables watchdog via 200nA current-source detection - no external components required |
Pinout & Package
MAX6725KASVD3 uses a 6-pin SOT23 package (2.9mm × 1.6mm × 1.1mm) with gull-wing leads, RoHS-compliant, rated for -40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output; requires external pullup; asserts when VCC1/VCC2 < threshold or MR low |
| 2 | GND | System ground reference for all comparators and logic; must be low-impedance connection |
| 3 | MR | Active-low manual-reset input; internal 50kΩ pullup to VCC1; 100ns glitch rejection prevents spurious resets |
| 4 | VCC2 | Secondary supply input (3.075V threshold monitor); powers internal comparator for VCC2 path |
| 5 | VCC1 | Primary supply input (4.625V threshold monitor); powers device core and enables RST output drive |
| 6 | WDI | Watchdog input; floating disables timer; rising/falling edge clears watchdog; 50nA max source current tolerance |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-trimmed voltage monitoring | Simultaneous 4.625V (VCC1) and 3.075V (VCC2) thresholds eliminate need for external resistor dividers or calibration |
| Guaranteed reset validity at 0.8V | Enables fail-safe reset assertion during deep brownout without external pulldown resistors or auxiliary biasing |
| Watchdog disable via floating WDI | Removes requirement for pullup/pulldown components while preventing false timeouts from leakage or noise |
| Open-drain RST with 100nA leakage | Supports wired-OR reset bus architectures and bidirectional µP reset pins via 4.7kΩ series isolation |
| 14µA supply current at 3.6V | Extends battery life in portable equipment - e.g., 10-year operation on CR2032 in always-on supervisory mode |
Applications
| Telecom Power Sequencing | Industrial PLC Controller |
|---|---|
Use Scenario: Sequencing startup of FPGA, DSP, and analog front-end in base station radio unit with asymmetric 5V/3.3V rails. IC Role / Device Role / Timing Role: Dual-voltage supervisor asserting RST until both VCC1 (5V) and VCC2 (3.3V) stabilize above 4.625V and 3.075V respectively, then holding reset for 210ms. Use Value: Prevents race conditions between power domains; eliminates need for discrete RC timing networks or secondary supervisors. | Use Scenario: Brownout protection for ARM-based PLC CPU operating from 5V main and 3.3V I/O supplies in factory automation cabinet. IC Role / Device Role / Timing Role: Monitoring both rails continuously; asserting RST within 20µs of VCC1 drop below 4.625V or VCC2 drop below 3.075V. Use Value: Guarantees µP reset before logic corruption occurs; operates reliably down to 0.8V supply to catch deep sags missed by higher-threshold devices. |
| Portable Medical Monitor | Battery-Backed Data Logger |
Use Scenario: Supervising main Li-ion (4.2V) and regulated 3.3V system supply in handheld ECG device with sleep/wake cycles. IC Role / Device Role / Timing Role: Using MR pin for user-initiated reset via tactile switch; open-drain RST interfaced to µP's bidirectional reset I/O through 4.7kΩ resistor. Use Value: Eliminates contention risk on shared reset line; 14µA quiescent current extends battery runtime between calibrations. | Use Scenario: Long-term environmental sensor node powered by primary alkaline cells and backup supercapacitor. IC Role / Device Role / Timing Role: Floating WDI to disable watchdog; relying on dual-voltage monitoring to detect end-of-life battery sag across both 4.625V and 3.075V thresholds. Use Value: Avoids unnecessary watchdog overhead in deterministic firmware; 210ms timeout ensures clean µP restart before EEPROM write corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6726KASVD3 | Push-pull RST output (vs. open-drain); same thresholds, timeout, and pinout | Requires no external pullup; incompatible with wired-OR reset buses or bidirectional µP reset I/O | Select when driving single-load reset line with defined VCC1-referenced high level |
| TPS3808G33DBVR | Single-supply monitor (3.3V only); no VCC2 input; 200ms timeout; 1.6µA supply current | Lacks dual-rail monitoring; cannot replace MAX6725KASVD3 in systems requiring independent 5V/3.3V supervision | Select only for cost-sensitive single-rail applications where VCC2 monitoring is omitted |
Compared with MAX6725KASVD3, MAX6726KASVD3 offers push-pull drive but loses wired-OR flexibility, while TPS3808G33DBVR reduces supply current by 90% but abandons dual-voltage capability - making MAX6725KASVD3 the sole choice for robust, low-glitch dual-rail brownout detection in harsh environments.
Availability
MAX6725KASVD3 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control, and portable medical equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6725KASVD3 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 power, sensing, and interface applications in industrial, automotive, and communications markets.
The MAX6715A–MAX6729A family delivers ultra-low-voltage supervisory circuits optimized for dual/triple supply monitoring in space-constrained, high-reliability systems - targeting applications where brownout resilience and minimal quiescent current are critical.
FAQ
What is the exact reset threshold voltage for VCC1 on MAX6725KASVD3?
The MAX6725KASVD3 has a factory-trimmed VCC1 reset threshold of 4.625V (falling), with ±125mV tolerance over temperature. This value is fixed by the "L" suffix in the part number per Maxim's Reset Voltage Threshold Suffix Guide and does not require external resistor configuration. The threshold is referenced to VCC1 and remains stable with 20ppm/°C tempco.
Does MAX6725KASVD3 support monitoring a third voltage rail?
No, MAX6725KASVD3 does not support a third voltage rail. It is a dual-supply supervisor with dedicated VCC1 and VCC2 inputs only. Models like MAX6723A–MAX6727A include RSTIN for adjustable third-rail monitoring, but MAX6725KASVD3 lacks this pin and internal circuitry - its pinout and functional description confirm only two monitored supplies.
What is the function of the WDI pin on MAX6725KASVD3, and how is it disabled?
The WDI pin on MAX6725KASVD3 serves as the watchdog input; leaving it floating disables the watchdog timer via an internal 200nA current-source detector. This method requires no external components and ensures no false timeouts from leakage currents exceeding 50nA. Driving WDI high or low for >1.12s (min) will assert reset if watchdog is enabled.
Can MAX6725KASVD3 operate reliably when VCC1 drops to 0.8V?
Yes, MAX6725KASVD3 guarantees correct reset output logic state down to VCC1 = 0.8V or VCC2 = 0.8V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures valid reset assertion during deep brownout events without requiring external biasing or pulldown resistors - a key differentiator from higher-threshold supervisors.
What package type and lead finish does MAX6725KASVD3 use?
MAX6725KASVD3 uses a 6-pin SOT23 package (2.9mm × 1.6mm × 1.1mm) with gull-wing leads and lead-free/RoHS-compliant matte tin plating. It is supplied in tape-and-reel format (T suffix) and rated for operation from -40°C to +125°C - matching industrial and telecom thermal requirements without derating.
MAX6725KASVD3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.575V, 3.075V, Adj
- Output:
- Open Drain, Open Drain
- 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:
- SOT-23-8
MAX6725KASVD3 FAQ
1.How can I place an order for MAX6725KASVD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6725KASVD3 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 MAX6725KASVD3 reliable?
The price and inventory of MAX6725KASVD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6725KASVD3 is usually 5 days.
3.What payment methods are accepted for MAX6725KASVD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6725KASVD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6725KASVD3?
MAX6725KASVD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6725KASVD3 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 MAX6725KASVD3?
For technical support, including MAX6725KASVD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6725KASVD3 requirements.
6.How does Aetrix verify that MAX6725KASVD3 is sourced from the original manufacturer or authorized distributors?
All MAX6725KASVD3 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 MAX6725KASVD3 meets industry standards.
7.What is the process for return or replacement of MAX6725KASVD3?
All MAX6725KASVD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6725KASVD3, 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 MAX6725KASVD3 part is unused and in its original packaging.
Return procedure for MAX6725KASVD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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