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Analog Devices Inc./Maxim Integrated MAX6725AKASDD2+T
- Part No.:
- MAX6725AKASDD2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6725AKASDD2+T.pdf
- Description:
- IC SUPERVISOR MPU SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,201
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Product details
Overview
MAX6725AKASDD2+T from Maxim Integrated is a dual-supply ultra-low-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (4.625V factory-trimmed threshold) and VCC2 (1.388V typical threshold) with 14µA supply current at 3.6V, 8.8ms minimum reset timeout, and active-low open-drain RST output - used for reliable power-on reset and brownout detection in telecom power systems.
For engineers reviewing the MAX6725AKASDD2+T datasheet, MAX6725AKASDD2+T pinout, MAX6725AKASDD2+T application, or MAX6725AKASDD2+T equivalent, key selection criteria include dual-rail voltage monitoring capability, guaranteed reset validity down to VCC = 0.8V, manual-reset input with internal 50kΩ pullup, watchdog disable option, and AEC-Q100-qualified variants for automotive-grade reliability validation.
Technical Context
The MAX6725AKASDD2+T implements independent dual-voltage comparators with factory-trimmed thresholds on VCC1 and VCC2 inputs, each feeding a shared reset timeout timer that asserts RST for ≥8.8ms after all monitored supplies recover. Its reset logic remains valid even when either VCC1 or VCC2 drops to 0.8V, enabling robust operation during deep brownouts.
It integrates a manual-reset input (MR) with 1µs minimum pulse width and 200ns MR-to-RST delay, plus an open-drain RST output referenced to VCC1 with 0.3V VOL at 50µA sink current. The device lacks RSTIN, PFI, PFO, WDI, or RST2 pins - confirming its fixed dual-supply configuration without auxiliary monitoring or watchdog functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (factory-trimmed, ±125mV tolerance) - ensures precise power-on reset for 5V/4.8V primary rails |
| VCC2 Reset Threshold | 1.388V (factory-trimmed, ±37.5mV tolerance) - supports reliable monitoring of 1.5V/1.35V secondary rails |
| Reset Timeout Period | 8.8ms (minimum) - provides sufficient hold time for μP initialization after power stabilization |
| Supply Current | 14µA (typical at 3.6V) - enables ultra-low-power operation in battery-backed or energy-sensitive systems |
| Operating Temperature | -40°C to +125°C - qualified for industrial and extended-temperature embedded applications |
| Reset Output Type | Active-low open-drain RST - requires external pullup; compatible with bidirectional μP reset I/O pins |
| MR Input Logic | Active-low with internal 50kΩ pullup to VCC1 - eliminates need for external biasing in manual-reset implementations |
Pinout & Package
MAX6725AKASDD2+T is housed in a 6-pin SOT23 package (package code U6+1), with thermal resistance θJA = 115°C/W on multilayer board and θJC = 80°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output; asserted when VCC1 or VCC2 falls below threshold; requires external pullup resistor |
| 2 | GND | Ground reference for all internal comparators and logic; must be low-impedance connection to system ground plane |
| 3 | MR | Active-low manual-reset input; internally pulled up to VCC1; 1µs minimum pulse width required to trigger reset |
| 4 | VCC2 | Secondary supply input; powers internal VCC2 comparator and sets VCC2 reset threshold (1.388V) |
| 5 | VCC1 | Primary supply input; powers device core and sets VCC1 reset threshold (4.625V); determines RST output reference |
| 6 | NC | No connect - pin 6 is unused and must remain unconnected per datasheet specification |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of VCC1 (4.625V) and VCC2 (1.388V) with separate comparators and shared timeout logic |
| Guaranteed reset validity down to 0.8V | Ensures correct RST assertion state even during severe brownout conditions on either supply rail |
| Low quiescent current | 14µA typical at 3.6V enables use in always-on subsystems without compromising battery life |
| Integrated MR pullup | 50kΩ internal pullup to VCC1 eliminates external component count for manual-reset implementation |
| Immunity to short VCC transients | Rejects glitches ≤20µs duration at 100mV overdrive, preventing spurious resets in noisy power environments |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring 48V DC-DC converter outputs (5V and 1.5V rails) in base station power management units. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting RST until both VCC1 and VCC2 stabilize post-power-up. Use Value: Prevents firmware execution on incomplete power rails, eliminating boot failures in distributed telecom equipment. |
Use Scenario: Ensuring deterministic reset behavior during AC line sags in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Brownout detector triggering controlled shutdown when 24V field power dips below 22V while 3.3V logic rail remains nominal. Use Value: Maintains RST assertion for ≥8.8ms to allow safe state capture before volatile memory loss. |
| Automotive Infotainment Head Units | Medical Diagnostic Imaging Subsystems |
Use Scenario: Supervising dual-core SoC supplies (1.1V CPU core and 3.3V I/O) in vehicle infotainment gateways. IC Role / Device Role / Timing Role: Independent threshold detection on VCC2 (1.388V) and VCC1 (4.625V) with coordinated reset hold-off. Use Value: Guarantees reset validity down to 0.8V on either rail - critical for cold-cranking scenarios where battery dips to 6V. |
Use Scenario: Validating isolated 5V and 1.2V supplies powering FPGA-based image reconstruction engines. IC Role / Device Role / Timing Role: Fail-safe reset generator ensuring no partial initialization occurs if either supply fails during MRI scan preparation. Use Value: 14µA supply current minimizes self-heating in thermally constrained medical enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6726AKASDD2+T | Push-pull RST output instead of open-drain; identical thresholds, timeout, and pinout | Eliminates need for external pullup but requires VCC1-referenced reset load matching | Select when driving CMOS inputs directly without level-shifting or when bidirectional μP reset I/O is not used |
| TPS3808G33DBVR | Single-supply (3.3V only), 200ms timeout, 2.5µA ICC, SOT23-6 package | Lacks dual-rail monitoring; suitable only for single-rail systems requiring longer timeout and lower current | Choose for cost-sensitive 3.3V-only applications where VCC2 supervision is unnecessary |
Compared with MAX6726AKASDD2+T, the MAX6725AKASDD2+T offers open-drain flexibility for mixed-voltage reset buses; versus TPS3808G33DBVR, it provides essential dual-rail coverage at higher current but with tighter timing control for fast-boot systems.
Availability
MAX6725AKASDD2+T is available at Aetrix Electronics and suitable for telecom power sequencing, industrial PLC I/O modules, and automotive infotainment head units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6725AKASDD2+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 demanding industrial, automotive, and communications applications, emphasizing high reliability and low-power operation.
The MAX6715A–MAX6729A family delivers dual/triple voltage supervision in ultra-small SOT23 packages, targeting space-constrained systems needing guaranteed reset behavior across wide voltage and temperature ranges.
FAQ
What is the exact reset threshold voltage for VCC1 on MAX6725AKASDD2+T?
The MAX6725AKASDD2+T has a factory-trimmed VCC1 reset threshold of 4.625V (typical), with a guaranteed range of 4.500V to 4.750V at -40°C to +125°C. This value is fixed by the "K" suffix in the part number and applies specifically to the MAX6725AKASDD2+T variant - not adjustable via external components.
Does MAX6725AKASDD2+T support watchdog timer functionality?
No, the MAX6725AKASDD2+T does not include watchdog timer functionality. Its pinout omits WDI, and the datasheet confirms this variant belongs to the MAX6725A/MAX6726A subgroup, which lacks watchdog inputs. For watchdog capability, consider MAX6727A or MAX6729A variants instead of MAX6725AKASDD2+T.
What is the function of pin 6 on MAX6725AKASDD2+T?
Pin 6 on MAX6725AKASDD2+T is a no-connect (NC) terminal. It is not bonded internally and must remain unconnected in PCB layout. This differs from other variants like MAX6728A/MAX6729A, where pin 6 serves as PFI - confirming MAX6725AKASDD2+T's dedicated dual-supply-only configuration.
Can MAX6725AKASDD2+T monitor a 1.8V supply as VCC2?
No, MAX6725AKASDD2+T is factory-configured for a VCC2 threshold of 1.388V (suffix "A"), not 1.8V. Attempting to apply 1.8V to VCC2 will cause immediate reset assertion since 1.8V exceeds the 1.388V threshold. For 1.8V monitoring, select a variant with "S" suffix (2.925V) or "R" suffix (2.625V) - not MAX6725AKASDD2+T.
What is the maximum sink current capability of the RST output on MAX6725AKASDD2+T?
The RST output on MAX6725AKASDD2+T can sink up to 1.2mA while maintaining VOL ≤ 0.3V, provided VCC1 or VCC2 ≥ 2.7V. At 4.5V supply, it sustains 3.2mA sink with VOL ≤ 0.4V. These values are specified in the Electrical Characteristics table and apply directly to MAX6725AKASDD2+T's open-drain RST structure.
MAX6725AKASDD2+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- 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:
- 8.8ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6725AKASDD2+T FAQ
1.How can I place an order for MAX6725AKASDD2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6725AKASDD2+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 MAX6725AKASDD2+T reliable?
The price and inventory of MAX6725AKASDD2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6725AKASDD2+T is usually 5 days.
3.What payment methods are accepted for MAX6725AKASDD2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6725AKASDD2+T transactions.
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4.How is shipping managed for MAX6725AKASDD2+T?
MAX6725AKASDD2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6725AKASDD2+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 MAX6725AKASDD2+T?
For technical support, including MAX6725AKASDD2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6725AKASDD2+T requirements.
6.How does Aetrix verify that MAX6725AKASDD2+T is sourced from the original manufacturer or authorized distributors?
All MAX6725AKASDD2+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 MAX6725AKASDD2+T meets industry standards.
7.What is the process for return or replacement of MAX6725AKASDD2+T?
All MAX6725AKASDD2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6725AKASDD2+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 MAX6725AKASDD2+T part is unused and in its original packaging.
Return procedure for MAX6725AKASDD2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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