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Analog Devices Inc./Maxim Integrated MAX6725AKATGD3+
- Part No.:
- MAX6725AKATGD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6725AKATGD3+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,249
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Product details
Overview
MAX6725AKATGD3+ from Maxim Integrated is a dual-voltage microprocessor supervisory IC in an 8-pin SOT23 package, monitoring VCC1 (1.8V–5.0V) and VCC2 (0.9V–3.3V) with factory-trimmed thresholds, featuring active-low push-pull RST/RST1 outputs, manual-reset input (MR), watchdog timer (WDI), and 280ms minimum reset timeout. It ensures reliable system reset during brownouts in telecom power supplies and industrial controllers.
For engineers reviewing the MAX6725AKATGD3+ datasheet, MAX6725AKATGD3+ pinout, MAX6725AKATGD3+ application, or MAX6725AKATGD3+ equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over -40°C to +125°C), guaranteed reset validity down to VCC1/VCC2 = 0.8V, low 14µA typical supply current at 3.6V, and integrated watchdog with 35s startup / 1.12s normal timeout.
Technical Context
The MAX6725AKATGD3+ implements independent voltage comparators for VCC1 and VCC2, each with 0.5% hysteresis referenced to their respective thresholds, and asserts reset when either supply falls below its trimmed level. Its internal reset timeout timer (280ms min) restarts on any threshold violation before expiration.
This device integrates a dual-mode watchdog timer: after each reset event, it enforces a 35s minimum startup period before entering 1.12s minimum normal-mode timeout; WDI transitions clear the timer, while sustained high/low states trigger reset assertion. MR input features 50kΩ internal pullup and 1µs minimum pulse width support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.925V (typ), factory-trimmed 'S' suffix - sets primary supply reset point for 3.0V systems with ±1.5% tolerance over temperature |
| VCC2 Threshold | 2.925V (typ), factory-trimmed 'S' suffix - matches secondary supply (e.g., I/O rail) with same precision as VCC1 |
| Reset Timeout | 280ms (min), 'D3' suffix - ensures sufficient hold time for complex processor initialization sequences |
| Supply Current | 14µA (typ) at 3.6V - enables battery-backed operation in portable equipment without significant drain |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| Reset Validity | Down to VCC1 or VCC2 = 0.8V - guarantees correct logic state during deep brownout conditions |
| WDI Timeout | 35s startup / 1.12s normal mode - accommodates lengthy boot firmware while enabling rapid fault detection during runtime |
Pinout & Package
MAX6725AKATGD3+ uses an 8-pin SOT23 package (JEDEC MO-203AA), 2.9mm × 1.6mm footprint, 1.1mm max height, with exposed pad for thermal performance. Pin 1 marked by dot; pins numbered counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST/RST1 | Active-low push-pull reset output referenced to VCC1; asserts when VCC1/VCC2 drop below threshold, MR pulled low, or WDI timeout occurs |
| 2 | GND | System ground reference for all internal comparators and logic; must be low-impedance connection to minimize noise coupling |
| 3 | MR | Active-low manual-reset input with 50kΩ internal pullup to VCC1; 1µs minimum pulse width ensures robust noise immunity |
| 4 | VCC2 | Secondary supply input (0.9V–3.3V); powers internal circuitry when above VCC1 and serves as reference for VCC2 comparator |
| 5 | VCC1 | Primary supply input (1.8V–5.0V); powers device when above VCC2 and serves as reference for VCC1 comparator and RST output |
| 6 | WDI | Watchdog input; rising/falling edges reset internal timer; unconnected state disables watchdog via 200nA detector current |
| 7 | PFO | Active-low power-fail output (push-pull), referenced to VCC1; asserts when PFI < 626.5mV, deasserts immediately without timeout |
| 8 | PFI | Power-fail input; high-impedance comparator noninverting input with 3mV hysteresis; used to monitor auxiliary supplies via resistor divider |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC1 and VCC2 supervision with separate thresholds avoids single-point failure in multirail systems |
| Guaranteed reset validity to 0.8V | Ensures deterministic reset behavior during severe brownouts where other supervisors may glitch or release prematurely |
| Configurable watchdog modes | 35s startup window prevents false timeout during boot; 1.12s runtime timeout detects software hangs within milliseconds |
| Integrated power-fail comparator | PFI/PFO pair enables early warning of supply degradation (e.g., battery depletion) without external components |
| Low 14µA supply current | Reduces standby power in always-on subsystems such as IoT edge nodes and remote sensors |
Applications
| Telecom Power Management | Industrial PLC Controllers |
|---|---|
Use Scenario: Monitoring primary 3.3V core and secondary 1.8V I/O rails in 5G base station power modules. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting reset if either rail drops below 2.925V, with 280ms timeout ensuring FPGA configuration completes. Use Value: Prevents corrupted firmware load during transient line disturbances common in telco infrastructure. |
Use Scenario: Supervising 24V DC input and 5V logic supply in programmable logic controller backplanes. IC Role / Device Role / Timing Role: VCC1 monitors regulated 5V logic rail; VCC2 monitors 24V field bus supply via resistor divider; MR supports field-service reset. Use Value: Eliminates need for discrete reset ICs and external timing capacitors, reducing BOM count by 3 components. |
| Automotive Infotainment | Medical Diagnostic Equipment |
Use Scenario: Ensuring clean boot of ARM-based infotainment SoC powered by 1.2V core and 3.3V peripheral rails. IC Role / Device Role / Timing Role: MAX6725AKATGD3+ provides VCC1=1.2V and VCC2=3.3V monitoring with AEC-Q100-compatible operation up to +125°C junction. Use Value: Meets ASIL-B functional safety requirements for reset integrity during engine compartment thermal cycling. |
Use Scenario: Supervising isolated 5V analog front-end and 3.3V digital processing rails in portable ultrasound units. IC Role / Device Role / Timing Role: Uses PFI to monitor battery voltage decay; PFO triggers graceful shutdown before critical cutoff. Use Value: Extends usable battery life by 12% through precise low-voltage warning versus fixed-threshold alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6726AKATGD3+ | Identical pinout, package, and electrical specs; differs only in reset output polarity (RST active-high vs. MAX6725AKATGD3+ active-low) | Required when host µP demands active-high reset assertion instead of active-low | Select MAX6726AKATGD3+ only when µP reset pin is active-high; otherwise MAX6725AKATGD3+ is direct functional match |
| TPS3808G33DBVR | Single-supply (3.3V only), no VCC2 input; 200ms timeout; higher 25µA supply current; no integrated watchdog | Limited to single-rail systems; lacks triple-monitoring capability and WDI functionality of MAX6725AKATGD3+ | Choose TPS3808G33DBVR only for cost-sensitive, single-supply designs where watchdog and auxiliary monitoring are unnecessary |
Compared with MAX6726AKATGD3+, MAX6725AKATGD3+ provides native active-low reset compatible with most µPs, while TPS3808G33DBVR sacrifices dual-supply flexibility and watchdog for lower unit cost in simpler applications.
Availability
MAX6725AKATGD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and automotive electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6725AKATGD3+ 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 demanding industrial, automotive, and communications applications.
The MAX6715A–MAX6729A family delivers ultra-low-voltage supervisory circuits optimized for multivoltage systems where reliability, small size, and guaranteed operation down to 0.8V are critical design requirements.
FAQ
What is the exact reset threshold voltage for MAX6725AKATGD3+?
The MAX6725AKATGD3+ has factory-trimmed 'S' suffix thresholds: VCC1 reset threshold is 2.925V (typ), VCC2 reset threshold is also 2.925V (typ), both with ±1.5% tolerance over -40°C to +125°C. These values are specified in the Electrical Characteristics table of the MAX6725AKATGD3+ datasheet under VTH1 and VTH2 parameters.
Does MAX6725AKATGD3+ support monitoring a third voltage rail?
No, MAX6725AKATGD3+ does not support third-rail monitoring. It is a dual-supply supervisor (VCC1 and VCC2 only). The RSTIN and PFI inputs are not present on this variant - those features appear only on MAX6723A–MAX6727A and MAX6728A–MAX6729A variants per the Selector Guide and Pin Description tables.
What is the function of the WDI pin on MAX6725AKATGD3+?
The WDI (Watchdog Input) pin on MAX6725AKATGD3+ monitors microprocessor activity: if WDI remains static (high or low) longer than the watchdog timeout period, it triggers a system reset. After power-up or reset, MAX6725AKATGD3+ enters a 35s startup mode, then switches to 1.12s normal-mode timeout - both values are fixed for this part number.
Can MAX6725AKATGD3+ operate with VCC1 = 1.8V and VCC2 = 1.2V simultaneously?
Yes, MAX6725AKATGD3+ supports VCC1 as low as 1.8V and VCC2 as low as 0.9V, so 1.8V/1.2V dual-rail operation is fully supported. Its guaranteed reset validity down to VCC1 or VCC2 = 0.8V ensures reliable supervision even during deep brownout conditions on either rail.
Is MAX6725AKATGD3+ RoHS-compliant and lead-free?
Yes, MAX6725AKATGD3+ is RoHS-compliant and lead-free, indicated by the '+' suffix in the part number per Maxim's ordering conventions. It meets JEDEC J-STD-020 moisture sensitivity level 1 and is qualified for reflow soldering per IPC/JEDEC J-STD-020 standards.
MAX6725AKATGD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.11V, 3.075V, Adj
- Output:
- Open Drain, Open Drain
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6725AKATGD3+ FAQ
1.How can I place an order for MAX6725AKATGD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6725AKATGD3+ 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 MAX6725AKATGD3+ reliable?
The price and inventory of MAX6725AKATGD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6725AKATGD3+ is usually 5 days.
3.What payment methods are accepted for MAX6725AKATGD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6725AKATGD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6725AKATGD3+?
MAX6725AKATGD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6725AKATGD3+ 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 MAX6725AKATGD3+?
For technical support, including MAX6725AKATGD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6725AKATGD3+ requirements.
6.How does Aetrix verify that MAX6725AKATGD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6725AKATGD3+ 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 MAX6725AKATGD3+ meets industry standards.
7.What is the process for return or replacement of MAX6725AKATGD3+?
All MAX6725AKATGD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6725AKATGD3+, 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 MAX6725AKATGD3+ part is unused and in its original packaging.
Return procedure for MAX6725AKATGD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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