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Analog Devices Inc./Maxim Integrated MAX6725AKAWGD3+T
- Part No.:
- MAX6725AKAWGD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6725AKAWGD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,573
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Product details
Overview
MAX6725AKAWGD3+T from Maxim Integrated is a dual-supply microprocessor supervisory IC monitoring VCC1 (primary) and VCC2 (secondary) with factory-trimmed reset thresholds, 140ms minimum reset timeout, push-pull active-low RST output, manual-reset input (MR), and watchdog timer disable capability. It operates from -40°C to +125°C in SOT23-6 package and is used in telecom power management to ensure reliable boot and brownout recovery.
For engineers reviewing the MAX6725AKAWGD3+T datasheet, MAX6725AKAWGD3+T pinout, MAX6725AKAWGD3+T application, or MAX6725AKAWGD3+T equivalent, key selection criteria include dual-voltage monitoring down to 0.8V supply validity, guaranteed reset assertion during VCC1/VCC2 undervoltage, 140ms timeout period, MR-driven reset initiation, and watchdog disable via unconnected WDI pin.
Technical Context
The MAX6725AKAWGD3+T integrates dual independent voltage comparators for VCC1 and VCC2, each with factory-trimmed thresholds (VTH1 = 4.625V typ, VTH2 = 3.075V typ), hysteresis of 0.5%, and temperature coefficient of 20ppm/°C. Its reset logic asserts RST low when either supply falls below threshold and holds for 140ms min after both recover.
It features a manual-reset input (MR) with internal 50kΩ pullup to VCC1, 1µs minimum pulse width, and 200ns MR-to-RST delay; watchdog disable is implemented by leaving WDI floating (200nA unconnected-state detection). The device guarantees valid reset output down to VCC1 or VCC2 = 0.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V typical - sets primary supply brownout detection point for 5V systems |
| VCC2 Reset Threshold | 3.075V typical - enables secondary supply monitoring for 3.3V I/O rails |
| Reset Timeout Period | 140ms minimum - ensures sufficient hold time for processor initialization and memory stabilization |
| Supply Current | 15µA typical at 3.6V - supports ultra-low-power battery-backed applications |
| Operating Temperature | -40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| Reset Output Type | Push-pull active-low RST - eliminates need for external pullup and drives directly into µP reset pin |
| MR Input Pullup | 50kΩ internal to VCC1 - simplifies manual-reset switch interface without external components |
Pinout & Package
MAX6725AKAWGD3+T is housed in a 6-pin SOT23 package (package code U6+1), with 1.6mm × 2.9mm footprint and 0.95mm height. Thermal resistance θJA = 115°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST/RST1 | Active-low reset output | Push-pull driver referenced to VCC1; asserts low on VCC1/VCC2 undervoltage, MR low, or watchdog timeout |
| 2 - GND | Ground reference | Common return path for all internal comparators, timers, and output drivers |
| 3 - MR | Manual-reset input | Active-low input with internal 50kΩ pullup to VCC1; initiates reset when pulled low for ≥1µs |
| 4 - VCC2 | Secondary supply input | Powers internal circuitry when > VCC1; monitored for secondary reset threshold (3.075V typ) |
| 5 - VCC1 | Primary supply input | Main power source and primary reset monitor input (4.625V typ threshold); powers RST output stage |
| 6 - WDI | Watchdog input | Unconnected state disables watchdog; rising/falling edges reset 1.12s normal timeout period after 35s startup |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC1 (4.625V) and VCC2 (3.075V) supervision with separate comparators and hysteresis |
| Guaranteed reset validity down to 0.8V | Ensures correct RST logic state even during deep brownout conditions where VCC1 or VCC2 drops to 0.8V |
| 140ms minimum reset timeout | Provides deterministic hold time for full system initialization before release, avoiding premature µP execution |
| Internal MR pullup resistor | 50kΩ to VCC1 eliminates external component count and enables direct connection of momentary switch to GND |
| Watchdog disable by floating WDI | 200nA unconnected-state detector allows functional watchdog removal without PCB modification or jumpering |
Applications
| Telecom Power Sequencing | Industrial PLC Controller |
|---|---|
|
Use Scenario: Monitoring dual-rail DC-DC outputs (5V core, 3.3V I/O) in base station power modules during cold start and line transients. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting synchronized reset until both rails stabilize above 4.625V and 3.075V, holding for 140ms. Use Value: Prevents FPGA configuration corruption and DSP lockup caused by asymmetric rail ramp-up or transient-induced brownout. |
Use Scenario: Ensuring deterministic restart after AC mains interruption in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Supervising main 24VDC supply (via resistor divider to VCC1) and isolated 5V logic rail (VCC2), triggering reset on either fault. Use Value: Guarantees clean state restoration across I/O modules and communication interfaces without firmware intervention. |
| Automotive Infotainment Head Unit | Network Switch Power Management |
|
Use Scenario: Validating 12V-to-5V and 5V-to-3.3V conversion stages in AEC-Q100-compliant infotainment systems. IC Role / Device Role / Timing Role: Monitoring VCC1 (5V) and VCC2 (3.3V) with -40°C to +125°C operation; MR pin enables service-mode forced reset. Use Value: Meets automotive reset timing requirements while supporting field diagnostics via hardware reset button. |
Use Scenario: Coordinating power-up sequencing of PHY, MAC, and management MCU in 1U rack-mounted Ethernet switches. IC Role / Device Role / Timing Role: Using MR input to synchronize reset across multiple ASICs during hot-swap insertion; RST output drives reset tree. Use Value: Eliminates race conditions between power rails and digital logic, reducing boot failure rate in multi-voltage systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6723AKAWGD3+T | Open-drain RST output instead of push-pull; requires external pullup resistor | Suitable where level-shifting or wired-OR reset bus is needed; less drive strength than MAX6725AKAWGD3+T | Select when interfacing to bidirectional µP reset pins or sharing reset line with other open-drain sources |
| TPS3808G33DBVR | Single-supply monitor (3.3V only); no VCC2 input or MR pin; 200ms timeout | Lacks dual-rail monitoring and manual reset; designed for simpler 3.3V-only systems | Choose only if system uses single 3.3V rail and does not require MR functionality or secondary supply supervision |
Compared with MAX6723AKAWGD3+T and TPS3808G33DBVR, MAX6725AKAWGD3+T provides superior integration for dual-rail systems requiring robust, self-contained reset generation without external components-especially critical in space-constrained telecom and automotive modules where layout area and BOM count are tightly controlled.
Availability
MAX6725AKAWGD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLC controllers, and automotive infotainment systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6725AKAWGD3+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 high-reliability industrial, automotive, and communications applications.
The MAX6715A–MAX6729A family delivers ultra-low-voltage supervisory circuits optimized for multivoltage systems where simultaneous monitoring of primary and secondary rails is essential for safe boot and fault recovery.
FAQ
What is the reset timeout period of the MAX6725AKAWGD3+T?
The MAX6725AKAWGD3+T has a guaranteed minimum reset timeout period of 140ms. This duration begins when VCC1 and VCC2 rise above their respective reset thresholds (4.625V and 3.075V) and ensures the reset signal remains asserted long enough for microprocessor and peripheral initialization. The value is factory-trimmed and specified over the full -40°C to +125°C operating range.
Does the MAX6725AKAWGD3+T support manual reset functionality?
Yes, the MAX6725AKAWGD3+T includes an active-low manual-reset input (MR) on Pin 3. It features an internal 50kΩ pullup resistor to VCC1, allowing direct connection of a momentary switch to ground. A low pulse ≥1µs on MR forces reset assertion for the full 140ms timeout period, making it ideal for field service and diagnostic modes in deployed MAX6725AKAWGD3+T systems.
How is the watchdog function disabled on the MAX6725AKAWGD3+T?
The watchdog function on the MAX6725AKAWGD3+T is disabled by leaving the WDI pin (Pin 6) unconnected. An internal 200nA current source detects the floating state and inhibits watchdog timer operation. This design avoids the need for jumpers or configuration resistors-ensuring that MAX6725AKAWGD3+T operates as a pure voltage supervisor unless WDI is actively driven.
What is the operating voltage range for valid reset operation of the MAX6725AKAWGD3+T?
The MAX6725AKAWGD3+T guarantees correct reset output logic state as long as either VCC1 or VCC2 remains above 0.8V. This specification ensures reliable reset assertion during deep brownout events where one supply collapses while the other sustains minimal bias-critical for fail-safe behavior in MAX6725AKAWGD3+T-based power management architectures.
What package type and footprint does the MAX6725AKAWGD3+T use?
The MAX6725AKAWGD3+T is supplied in a 6-pin SOT23 package (outline 21-0058, land pattern 90-0175), measuring 1.6mm × 2.9mm with 0.95mm height. Its compact size and standard SOT23 footprint enable high-density placement in space-constrained applications such as optical transceivers and modular telecom cards where MAX6725AKAWGD3+T supervises multiple voltage domains.
MAX6725AKAWGD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.11V, 1.665V, Adj
- Output:
- Open Drain, Open Drain
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6725AKAWGD3+T FAQ
1.How can I place an order for MAX6725AKAWGD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6725AKAWGD3+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 MAX6725AKAWGD3+T reliable?
The price and inventory of MAX6725AKAWGD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6725AKAWGD3+T is usually 5 days.
3.What payment methods are accepted for MAX6725AKAWGD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6725AKAWGD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6725AKAWGD3+T?
MAX6725AKAWGD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6725AKAWGD3+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 MAX6725AKAWGD3+T?
For technical support, including MAX6725AKAWGD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6725AKAWGD3+T requirements.
6.How does Aetrix verify that MAX6725AKAWGD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6725AKAWGD3+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 MAX6725AKAWGD3+T meets industry standards.
7.What is the process for return or replacement of MAX6725AKAWGD3+T?
All MAX6725AKAWGD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6725AKAWGD3+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 MAX6725AKAWGD3+T part is unused and in its original packaging.
Return procedure for MAX6725AKAWGD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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