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Analog Devices Inc./Maxim Integrated MAX6725AKASDD3+
- Part No.:
- MAX6725AKASDD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6725AKASDD3+.pdf
- Description:
- MAX6725 TRIPLE, ULTRA-LOW-VOLTAG
- Quantity:
- Payment:
- Shipping:
Inventory:581
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Product details
Overview
The MAX6725AKASDD3+ from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in 8-pin SOT23 package, monitoring VCC1 (4.625V threshold) and VCC2 (3.075V threshold) with 210ms reset timeout, manual-reset input, watchdog timer, and push-pull active-low RST output. It guarantees valid reset assertion down to VCC1 or VCC2 = 0.8V and draws only 14µA typical supply current at 3.6V - used in telecom power management and industrial embedded controllers requiring reliable brownout detection.
For engineers reviewing the MAX6725AKASDD3+ datasheet, MAX6725AKASDD3+ pinout, MAX6725AKASDD3+ application, or MAX6725AKASDD3+ equivalent, key selection factors include its factory-trimmed dual-threshold configuration, 210ms guaranteed minimum reset timeout, push-pull RST output referenced to VCC1, integrated watchdog with 35s startup/1.12s normal mode, and operation across –40°C to +125°C.
Technical Context
This device implements dual independent voltage monitoring using precision bandgap-referenced comparators for VCC1 and VCC2, each with 20ppm/°C tempco and 0.5% hysteresis. The reset logic combines ORed fault conditions (VCC1/VCC2 undervoltage, MR low, WDI timeout) and enforces a monotonic 210ms minimum timeout via an internal RC timer after all monitored supplies recover.
The watchdog features dual-mode timing: a 35s minimum initial period after any reset event (power-up, MR, or watchdog timeout), followed by a 1.12s minimum normal timeout triggered by the first WDI edge - ensuring robust boot sequence coverage while enabling fast fault response during runtime. The push-pull RST output is rail-to-rail referenced to VCC1 and sinks up to 3.2mA at 4.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed falling threshold; ensures reset asserts before 5V system rail drops below 4.6V) |
| VCC2 Threshold | 3.075V (factory-trimmed falling threshold; matches common 3.3V I/O supply tolerance margin) |
| Reset Timeout | 210ms min (guaranteed minimum duration ensures µP completes full initialization before release) |
| Supply Current | 14µA typ at 3.6V (ultra-low quiescent draw enables battery-backed or energy-constrained systems) |
| Operating Temp | –40°C to +125°C (fully specified for under-hood automotive, industrial control, and telecom base station use) |
| Watchdog Modes | 35s startup / 1.12s normal (prevents false timeout during boot; enables rapid fault detection post-initialization) |
| Reset Output Type | Push-pull active-low RST (no external pullup required; drives directly to VCC1 rail with 0.4V VOL @ 3.2mA) |
Pinout & Package
Package: 8-pin SOT23 (3.0mm × 1.6mm × 1.1mm body, 0.65mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST/RST1 | Active-low push-pull reset output referenced to VCC1; asserts when VCC1/VCC2 drop below thresholds, MR is pulled low, or WDI times out |
| 2 | GND | System ground reference for all internal comparators, timers, and output drivers |
| 3 | MR | Active-low manual-reset input with internal 50kΩ pullup to VCC1; forces reset when pulled low, holds reset for full timeout after release |
| 4 | VCC2 | Secondary supply input (powers internal circuitry when > VCC1; sets VCC2 monitor reference) |
| 5 | VCC1 | Primary supply input (powers internal circuitry when > VCC2; sets VCC1 monitor reference and RST output rail) |
| 6 | RSTIN | Adjustable reset comparator input (626.5mV internal reference); monitors third voltage via resistor divider; unused tied to VCC1 or VCC2 |
| 7 | WDI | Watchdog input; reset triggers if no edge occurs within 1.12s (normal mode); unconnected disables watchdog |
| 8 | PFO | Active-low power-fail output (push-pull); asserts when PFI < 626.5mV; deasserts immediately without timeout |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-trimmed voltage monitoring | Independent 4.625V (VCC1) and 3.075V (VCC2) thresholds with 20ppm/°C stability and 0.5% hysteresis |
| Guaranteed reset validity at low VCC | Functional reset assertion guaranteed even when VCC1 or VCC2 drops to 0.8V - critical for brownout recovery |
| Immunity to short VCC transients | Withstands negative-going glitches ≤20µs at 100mV overdrive - avoids spurious resets in noisy power environments |
| Integrated dual-mode watchdog | 35s startup window accommodates complex boot sequences; 1.12s runtime timeout detects software hangs |
| Low-power operation | 14µA typical ICC at 3.6V enables multi-year battery life in always-on monitoring applications |
Applications
| Telecom Power Sequencing | Industrial PLC Controller |
|---|---|
Use Scenario: Monitoring primary 5V DC-DC converter and secondary 3.3V I/O rail in a 48V-powered telecom line card with hot-swap capability. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting active-low RST to hold ARM Cortex-M7 MCU in reset until both rails stabilize above 4.625V and 3.075V, then holding reset for exactly 210ms. Use Value: Prevents firmware execution on marginal rails; 210ms timeout exceeds worst-case DC-DC soft-start and FPGA configuration time. | Use Scenario: Ensuring deterministic startup of a modular I/O controller with separate 24V field power and 5V logic supply in harsh factory environments. IC Role / Device Role / Timing Role: Supervising VCC1 (5V logic) and VCC2 (24V field) via resistor divider on RSTIN; generating reset pulse only when both supplies are within spec for ≥210ms. Use Value: Eliminates need for discrete RC reset circuits; push-pull RST drives optocoupler input directly without pullup. |
| Automotive Infotainment Head Unit | Battery-Powered Medical Sensor Node |
Use Scenario: Validating 12V-to-5V main converter and 5V-to-3.3V PMIC output in an AEC-Q200 qualified infotainment module operating from vehicle battery. IC Role / Device Role / Timing Role: Monitoring VCC1 (5V) and VCC2 (3.3V) with manual reset (MR) tied to service button; using WDI to detect MCU lockup during CAN bus communication. Use Value: Watchdog's 35s startup prevents timeout during bootload; 1.12s runtime timeout catches CAN stack freezes without CPU intervention. | Use Scenario: Supervising lithium coin-cell (3V) and regulated 1.8V sensor core supply in a wearable ECG patch with 10-year battery life target. IC Role / Device Role / Timing Role: Using ultra-low 14µA ICC to minimize drain; configuring RSTIN to monitor 3V battery via divider; asserting reset when battery falls below 2.5V. Use Value: Extends usable battery range by detecting end-of-life before brownout-induced data 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 |
|---|---|---|---|
| MAX6726AKASDD3+ | Identical pinout, package, thresholds, and timeout; differs only in RST output polarity (active-high vs. MAX6725A's active-low) | Requires PCB-level logic inversion or µP reset pin compatibility with active-high assertion | Select MAX6726A when host µP requires active-high reset signaling or when redesigning legacy active-high reset interfaces |
| TPS3808G33DBVR | Single-supply (3.3V only), no VCC2 monitor, no WDI, 200ms timeout, 2.5µA ICC - lacks dual-voltage and watchdog capability | Suitable only for single-rail systems; cannot replace dual-monitoring function without adding external circuitry | Choose only for cost-sensitive, single-rail applications where VCC2 monitoring and watchdog are unnecessary |
Compared with MAX6726AKASDD3+, the MAX6725AKASDD3+ provides native active-low reset drive without level-shifting; versus TPS3808G33DBVR, it delivers essential dual-rail supervision and watchdog functionality at the cost of higher quiescent current - making it indispensable for complex multi-supply embedded systems.
Availability
MAX6725AKASDD3+ is available at Aetrix Electronics and suitable for telecom power sequencing, industrial PLC controllers, automotive infotainment head units, and battery-powered medical sensor nodes requiring stable component supply across extended temperature ranges.
Supply support for MAX6725AKASDD3+ 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 high-performance analog and mixed-signal ICs for power, sensing, connectivity, and security applications.
The MAX6715A–MAX6729A family delivers ultra-low-voltage, dual/triple-supply supervisory circuits optimized for space-constrained, high-reliability embedded systems operating from 0.8V to 5.5V across –40°C to +125°C.
FAQ
What is the exact reset timeout period of the MAX6725AKASDD3+?
The MAX6725AKASDD3+ has a guaranteed minimum reset timeout period of 210ms, as indicated by the "D3" suffix in its part number. This value is factory-trimmed and specified over the full –40°C to +125°C temperature range. The actual timeout may be longer due to process variation but will never fall below 210ms under any operating condition.
Does the MAX6725AKASDD3+ support monitoring a third voltage supply?
Yes, the MAX6725AKASDD3+ supports third-voltage monitoring via its RSTIN pin, which features a precise 626.5mV internal reference. By connecting an external resistor divider between the auxiliary supply and ground, users can set a custom reset threshold down to 0.62V. RSTIN is high-impedance (<100nA input current), enabling low-power monitoring without loading the source.
What is the function of the WDI pin on the MAX6725AKASDD3+?
The WDI (Watchdog Input) pin on the MAX6725AKASDD3+ monitors microprocessor activity. If WDI remains static (high or low) beyond the watchdog timeout - 35s after reset or 1.12s during normal operation - the device asserts RST. A rising or falling edge on WDI clears the timer. Leaving WDI unconnected disables the watchdog function entirely.
Can the MAX6725AKASDD3+ operate reliably when VCC1 drops below 1.0V?
Yes, the MAX6725AKASDD3+ guarantees correct reset output logic state down to VCC1 or VCC2 = 0.8V. Its internal comparators and timer remain functional at this level, ensuring valid reset assertion during deep brownout conditions. Below 0.8V, reset behavior is not guaranteed - design margins should ensure system shutdown before reaching that point.
What are the absolute maximum ratings for VCC1 and VCC2 on the MAX6725AKASDD3+?
The MAX6725AKASDD3+ has an absolute maximum rating of –0.3V to +6.0V for both VCC1 and VCC2 pins. Exceeding +6.0V risks permanent damage. Operation is fully specified from 0.8V to 5.5V. Note that push-pull outputs are rated to VCC1 + 0.3V, so VCC1 must remain within safe limits when driving heavy loads.
MAX6725AKASDD3+ 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:
- 0.788V, 2.925V, Adj
- Output:
- Open Drain, Open Drain
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6725AKASDD3+ FAQ
1.How can I place an order for MAX6725AKASDD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6725AKASDD3+ 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 MAX6725AKASDD3+ reliable?
The price and inventory of MAX6725AKASDD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6725AKASDD3+ is usually 5 days.
3.What payment methods are accepted for MAX6725AKASDD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6725AKASDD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6725AKASDD3+?
MAX6725AKASDD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6725AKASDD3+ 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 MAX6725AKASDD3+?
For technical support, including MAX6725AKASDD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6725AKASDD3+ requirements.
6.How does Aetrix verify that MAX6725AKASDD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6725AKASDD3+ 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 MAX6725AKASDD3+ meets industry standards.
7.What is the process for return or replacement of MAX6725AKASDD3+?
All MAX6725AKASDD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6725AKASDD3+, 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 MAX6725AKASDD3+ part is unused and in its original packaging.
Return procedure for MAX6725AKASDD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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