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Analog Devices Inc./Maxim Integrated MAX6725AKASHD3+T
- Part No.:
- MAX6725AKASHD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6725AKASHD3+T.pdf
- Description:
- IC SUPERVISOR MPU SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,975
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Product details
Overview
MAX6725AKASHD3+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 MAX6725AKASHD3+T datasheet, MAX6725AKASHD3+T pinout, MAX6725AKASHD3+T application, or MAX6725AKASHD3+T equivalent, key selection criteria include dual-voltage monitoring down to 0.8V supply validity, guaranteed reset assertion during VCC1/VCC2 undervoltage, 140ms timeout precision, MR-driven system-level reset control, and watchdog disable via WDI floating - all critical for industrial embedded and automotive-grade power sequencing.
Technical Context
The MAX6725AKASHD3+T integrates two independent voltage comparators with factory-trimmed thresholds (VTH1 = 4.625V ±125mV for VCC1; VTH2 = 3.075V ±75mV for VCC2), a 140ms reset timeout timer, and a manual-reset input with internal 50kΩ pullup to VCC1. Its push-pull RST output is referenced to VCC1 and asserts low when either supply falls below threshold or MR is pulled low.
It features watchdog disable functionality via unconnected WDI pin (detected by 200nA current source), immunity to sub-20µs VCC transients, and guaranteed valid reset logic state down to VCC1 or VCC2 = 0.8V - enabling robust operation in noisy, wide-temperature industrial environments without external supervision circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Timeout Period | 140ms (min) - ensures sufficient hold time for processor initialization after power stabilization |
| VCC1 Reset Threshold | 4.625V (typ), ±125mV - precisely monitors 5V rail integrity with minimal false triggering |
| VCC2 Reset Threshold | 3.075V (typ), ±75mV - accurately supervises 3.3V auxiliary supply in multirail systems |
| Supply Current | 14µA (typ) at 3.6V - enables ultra-low-power operation in battery-backed or energy-sensitive applications |
| Operating Temperature | -40°C to +125°C - supports under-hood automotive and industrial control environments |
| Reset Output Type | Push-pull active-low RST - eliminates need for external pullup resistor and provides strong drive into μP reset pin |
| Manual-Reset Input | Active-low MR with 50kΩ internal pullup to VCC1 - simplifies board layout and enables hardware-initiated reset without external components |
Pinout & Package
MAX6725AKASHD3+T is housed in a 6-pin SOT23 package (package code U6+1A, outline 21-0058), with thermal resistance θJA = 115°C/W on multilayer PCB - suitable for high-density, thermally constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST / RST1 | Active-low push-pull reset output referenced to VCC1; asserts low on VCC1/VCC2 undervoltage or MR activation |
| 2 | GND | System ground reference for all internal comparators and timing circuits |
| 3 | MR | Active-low manual-reset input with internal 50kΩ pullup to VCC1; initiates reset when pulled to GND |
| 4 | VCC2 | Secondary supply input (0.8V–5.5V); powers internal circuitry when above VCC1 and sets VCC2 monitor threshold |
| 5 | VCC1 | Primary supply input (0.8V–5.5V); powers device when above VCC2 and sets primary reset threshold |
| 6 | WDI | Watchdog input; left unconnected to disable watchdog function; detects open-circuit via 200nA current source |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of VCC1 (4.625V) and VCC2 (3.075V) with separate thresholds and hysteresis - prevents single-point failure in multirail systems |
| Guaranteed reset validity down to 0.8V | Ensures correct RST logic state even during deep brownout conditions - critical for fail-safe shutdown in automotive and industrial power supplies |
| Watchdog disable via floating WDI | Eliminates need for external pullup/pulldown; 200nA detection current avoids interference with high-impedance nodes |
| Immunity to short VCC transients | Rejects <20µs negative-going glitches - avoids spurious resets during switching noise or load dump events |
| Low 14µA typical supply current | Reduces standby power in always-on subsystems such as remote monitoring or battery-buffered controllers |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitoring primary 5V and secondary 3.3V rails in line-card power management for optical transport equipment. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting reset during simultaneous or sequential rail collapse to prevent corrupted firmware execution. Use Value: 140ms timeout ensures full FPGA configuration and PHY initialization before release; push-pull RST drives μP reset directly without external components. |
Use Scenario: Ensuring deterministic startup and fault recovery in modular programmable logic controller backplanes with distributed 24V/5V/3.3V supplies. IC Role / Device Role / Timing Role: Supervisory guardrail that holds CPU in reset until all rails stabilize and validates continued presence of VCC1/VCC2 during runtime. Use Value: Guaranteed reset operation down to 0.8V allows safe shutdown during gradual brownout; MR input enables field-service reset without power cycle. |
| Automotive Infotainment Head Unit | Medical Diagnostic Imaging Subsystem |
Use Scenario: Managing power-up sequence of SoC, DDR memory, and display interface ICs in AEC-Q100-aligned infotainment modules. IC Role / Device Role / Timing Role: Dual-rail supervisor enforcing strict voltage order and timing margins per ISO 16750-2 transient requirements. Use Value: Factory-trimmed thresholds eliminate calibration overhead; -40°C to +125°C rating supports under-dash mounting without derating. |
Use Scenario: Supervising isolated 5V and 3.3V supplies powering FPGA-based image reconstruction engines in portable ultrasound devices. IC Role / Device Role / Timing Role: Fail-safe reset generator ensuring no partial initialization occurs if either supply dips during high-current imaging bursts. Use Value: 14µA quiescent current extends battery life between scans; MR input enables technician-initiated recalibration reset without disassembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6726AKASHD3+T | Identical pinout and electrical specs, but features active-high RST output instead of active-low | Required where host μP expects active-high reset assertion (e.g., certain ARM Cortex-M series) | Select MAX6726AKASHD3+T only when active-high logic polarity is mandatory; otherwise MAX6725AKASHD3+T is preferred for direct compatibility with standard reset inputs |
| TPS3808G33DBVR | Single-supply (3.3V only), no VCC2 input; 200ms timeout; open-drain RST requiring external pullup | Limited to 3.3V-only systems; lacks dual-rail monitoring and MR input | Use only in cost-sensitive, single-rail applications where dual monitoring is unnecessary; not a functional replacement for MAX6725AKASHD3+T's dual-supply capability |
Compared with MAX6726AKASHD3+T and TPS3808G33DBVR, MAX6725AKASHD3+T uniquely delivers factory-trimmed dual-rail supervision with push-pull active-low reset, MR input, and watchdog disable - making it the only option supporting full feature parity in compact SOT23-6 for demanding multivoltage industrial and automotive systems.
Availability
MAX6725AKASHD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, automotive infotainment, medical imaging subsystems, and battery-operated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6725AKASHD3+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, mixed-signal, and power management ICs for high-reliability industrial, automotive, and communications applications.
MAX6725AKASHD3+T belongs to the MAX6715A–MAX6729A family of ultra-low-voltage μP supervisory circuits engineered for dual/triple supply monitoring in space-constrained, thermally harsh environments where guaranteed reset behavior down to 0.8V is essential.
FAQ
What is the reset timeout period of MAX6725AKASHD3+T?
The MAX6725AKASHD3+T has a guaranteed minimum reset timeout period of 140ms. This value is factory-trimmed and specified across the full -40°C to +125°C operating temperature range. The timeout begins when VCC1 or VCC2 rises above its respective threshold and ends when the RST output deasserts, ensuring sufficient hold time for microprocessor initialization before release. This timing is fixed and not user-adjustable.
Does MAX6725AKASHD3+T support monitoring a third voltage rail?
No, MAX6725AKASHD3+T does not support third-rail monitoring. It is a dual-supply supervisor designed exclusively for VCC1 and VCC2 inputs. Unlike variants such as MAX6723A or MAX6727A, MAX6725AKASHD3+T lacks the RSTIN pin required for externally adjustable auxiliary voltage monitoring. Its pinout and internal architecture are optimized for two-rail supervision only.
How is the watchdog function disabled on MAX6725AKASHD3+T?
The watchdog function on MAX6725AKASHD3+T is disabled by leaving the WDI pin unconnected. An internal 200nA current source detects the open state, automatically disabling the watchdog timer. No external pullup or pulldown resistor is required. Connecting WDI to any node sourcing >50nA may interfere with detection and unintentionally enable the watchdog.
What is the maximum supply voltage the MAX6725AKASHD3+T can tolerate on VCC1 and VCC2?
MAX6725AKASHD3+T supports absolute maximum supply voltages of +6V on both VCC1 and VCC2 pins. However, functional operation is guaranteed only within 0.8V to 5.5V per supply. Operation above 5.5V risks permanent damage and violates the Absolute Maximum Ratings specification. The device is rated for continuous operation up to 5.5V with full parametric performance.
Is MAX6725AKASHD3+T compatible with AEC-Q100 automotive qualification?
No, MAX6725AKASHD3+T is not AEC-Q100 qualified. While it operates over the extended industrial temperature range (-40°C to +125°C), AEC-Q100 qualification applies only to specific variants explicitly designated in the ordering guide - such as MAX6719AUTTWD1/V+T. MAX6725AKASHD3+T is intended for industrial and telecom applications where AEC-Q100 stress testing is not required.
MAX6725AKASHD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.313V, 2.925V, 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
MAX6725AKASHD3+T FAQ
1.How can I place an order for MAX6725AKASHD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6725AKASHD3+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 MAX6725AKASHD3+T reliable?
The price and inventory of MAX6725AKASHD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6725AKASHD3+T is usually 5 days.
3.What payment methods are accepted for MAX6725AKASHD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6725AKASHD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6725AKASHD3+T?
MAX6725AKASHD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6725AKASHD3+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 MAX6725AKASHD3+T?
For technical support, including MAX6725AKASHD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6725AKASHD3+T requirements.
6.How does Aetrix verify that MAX6725AKASHD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6725AKASHD3+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 MAX6725AKASHD3+T meets industry standards.
7.What is the process for return or replacement of MAX6725AKASHD3+T?
All MAX6725AKASHD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6725AKASHD3+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 MAX6725AKASHD3+T part is unused and in its original packaging.
Return procedure for MAX6725AKASHD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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