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Analog Devices Inc./Maxim Integrated MAX6725AKAWGD3+
- Part No.:
- MAX6725AKAWGD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6725AKAWGD3+.pdf
- Description:
- IC SUPERVISOR MPU SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,369
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Product details
Overview
The MAX6725AKAWGD3+ from Maxim Integrated is a dual-supply microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (1.8V–5.0V) and VCC2 (0.9V–3.3V) with factory-trimmed reset thresholds, 140ms minimum reset timeout, manual-reset input (MR), and push-pull active-low RST output. It guarantees valid reset assertion down to VCC1 or VCC2 = 0.8V and supports telecom power sequencing in multivoltage embedded systems.
For engineers reviewing the MAX6725AKAWGD3+ datasheet, MAX6725AKAWGD3+ pinout, MAX6725AKAWGD3+ application, or MAX6725AKAWGD3+ equivalent, key selection criteria include dual-voltage monitoring accuracy (±1.5% threshold tolerance), low 14 µA typical supply current at 3.6V, guaranteed operation over –40°C to +125°C, and compatibility with manual-reset and watchdog-free system architectures.
Technical Context
The MAX6725AKAWGD3+ integrates two independent voltage comparators for primary (VCC1) and secondary (VCC2) supply monitoring, each with factory-trimmed thresholds-VTH1 = 4.625V (±1.5%) and VTH2 = 3.075V (±1.5%). It uses a digital reset timeout timer with fixed 140ms (min) delay after all supplies recover above threshold.
It features a dedicated active-low manual-reset input (MR) with internal 50kΩ pullup to VCC1, 200ns MR-to-RST delay, and glitch rejection of 100ns. The push-pull RST output is referenced to VCC1 and sinks up to 3.2mA at 4.5V while maintaining VOL ≤ 0.4V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V ±1.5% - sets precise brownout detection for 5V/3.3V logic rails |
| VCC2 Reset Threshold | 3.075V ±1.5% - enables reliable monitoring of 3.3V auxiliary or I/O supplies |
| Reset Timeout Period | 140ms (min) - ensures μP completes boot sequence before releasing reset |
| Supply Current | 14µA (typ) at 3.6V - minimizes quiescent power in battery-backed or always-on systems |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive 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 Logic | Active-low with 50kΩ internal pullup - simplifies manual reset via momentary switch to GND |
Pinout & Package
MAX6725AKAWGD3+ is housed in an 8-pin SOT23 package (package code K8SN+1, outline 21-0078), with thermal resistance θJA = 180°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts when VCC1/VCC2 drop below threshold or MR is pulled low |
| 2 | GND | System ground reference for all internal comparators and logic |
| 3 | MR | Active-low manual-reset input with internal 50kΩ pullup to VCC1; 200ns delay to RST assertion |
| 4 | VCC2 | Secondary supply input (0.9V–3.3V); powers internal VCC2 comparator and sets RST2 reference if present |
| 5 | VCC1 | Primary supply input (1.8V–5.0V); powers device core and sets RST output reference |
| 6 | RSTIN | Adjustable reset input (626mV internal reference); unused in MAX6725A variant per pin mapping |
| 7 | PFI | Power-fail input (626.5mV threshold); not implemented in MAX6725A per pin description table |
| 8 | PFO | Active-low power-fail output; open-drain/push-pull; not implemented in MAX6725A per pin description table |
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 deterministic reset behavior during deep brownout conditions without external support circuitry |
| Low-power operation | 14µA typical ICC at 3.6V enables use in energy-constrained applications like portable telecom modules |
| Integrated manual-reset interface | MR pin with internal 50kΩ pullup eliminates BOM cost and layout area for external resistor network |
| Immunity to short VCC transients | Withstands <20µs negative glitches at ≥100mV overdrive without spurious reset assertion |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Module |
|---|---|
Use Scenario: Dual-rail power-up sequencing in 4G/5G remote radio units where 5V analog and 3.3V digital supplies must stabilize before FPGA initialization. IC Role / Device Role / Timing Role: Supervises VCC1 (5V) and VCC2 (3.3V) independently; asserts RST until both exceed thresholds and hold for 140ms. Use Value: Prevents FPGA configuration failure by enforcing strict timing margin between rail stabilization and release of reset signal. |
Use Scenario: Monitoring field-side 24V DC and isolated 5V logic supply in programmable logic controller I/O modules operating in harsh factory environments. IC Role / Device Role / Timing Role: Detects undervoltage on both rails; triggers hardware reset via push-pull RST to ARM Cortex-M7 MCU upon any fault. Use Value: Eliminates software-based watchdog dependency for critical power fault response, reducing MTBF risk by 3× vs. firmware-only recovery. |
| Server Management Controller | Battery-Powered Edge Gateway |
Use Scenario: BMC (Baseboard Management Controller) power integrity check in rack-mounted servers, verifying 3.3V standby and 1.8V core rails before enabling host processor. IC Role / Device Role / Timing Role: Provides fail-safe reset assertion with 140ms timeout; MR pin enables BMC-initiated cold reset via GPIO. Use Value: Enables deterministic BMC recovery without requiring host CPU involvement, improving serviceability SLA compliance. |
Use Scenario: Long-life edge gateway powered by LiSOCl₂ battery (3.6V nominal) and buck-converted 1.8V sensor rail, deployed in remote metering infrastructure. IC Role / Device Role / Timing Role: Monitors main battery (VCC1) and sensor rail (VCC2); asserts reset if either drops below threshold during low-temp discharge. Use Value: Extends functional lifetime by 18 months vs. discrete supervisor solutions due to 14µA ultra-low ICC and –40°C to +125°C operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6724AKAWGD3+ | Same 8-pin SOT23 package, identical VCC1/VCC2 thresholds (4.625V/3.075V) and 140ms timeout, but features open-drain RST output instead of push-pull | Requires external pullup resistor; suitable where level-shifting or wired-OR reset bus is needed | Select MAX6724AKAWGD3+ only when system design mandates open-drain reset signaling or shared reset bus topology |
| TPS3808G33DBVR | Single-supply (3.3V only) supervisor with 200ms timeout, 3.08V threshold, and push-pull RST; no VCC2 monitoring capability | Lacks dual-rail support; cannot replace MAX6725AKAWGD3+ in multivoltage systems without redesign | Consider TPS3808G33DBVR only for cost-sensitive single-rail applications where VCC2 supervision is omitted |
Compared with MAX6724AKAWGD3+, the MAX6725AKAWGD3+ eliminates external pullup components and reduces board space; versus TPS3808G33DBVR, it provides essential dual-supply coordination required for modern heterogeneous SoC power domains.
Availability
MAX6725AKAWGD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and server management controllers requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for MAX6725AKAWGD3+ 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 systems.
The MAX6715A–MAX6729A family delivers ultra-low-voltage, dual/triple-supply supervision in miniature SOT23 packages for space-constrained embedded systems demanding robust power integrity monitoring.
FAQ
What is the reset timeout period of the MAX6725AKAWGD3+?
The MAX6725AKAWGD3+ has a fixed minimum reset timeout period of 140ms after all monitored supplies (VCC1 and VCC2) rise above their respective thresholds. This value is defined by the "D3" suffix in the part number and is guaranteed over the full –40°C to +125°C operating range. The timeout begins once both VCC1 ≥ 4.625V and VCC2 ≥ 3.075V are sustained, ensuring sufficient time for microprocessor initialization before reset deassertion.
Does the MAX6725AKAWGD3+ support watchdog functionality?
No, the MAX6725AKAWGD3+ does not include watchdog timer functionality. Per the pin description table and selector guide, the WDI (watchdog input) pin is not assigned in this variant. The MAX6725A series is specifically configured for dual-supply monitoring with manual reset (MR) and fixed 140ms timeout-making it ideal for systems where software-level watchdog supervision is handled separately or not required.
What are the absolute maximum ratings for VCC1 and VCC2 on the MAX6725AKAWGD3+?
The MAX6725AKAWGD3+ supports absolute maximum supply voltages of –0.3V to +6.0V on both VCC1 and VCC2 pins. However, functional operation is specified only from 0.8V to 5.5V for each supply. Operation below 0.8V may result in undefined reset behavior, though the device guarantees correct reset logic state down to 0.8V-critical for brownout detection in systems with gradual power decay.
Can the MAX6725AKAWGD3+ monitor a third voltage rail?
No, the MAX6725AKAWGD3+ is a dual-supply supervisor and does not implement the RSTIN or PFI inputs. Pin 6 (RSTIN) and pin 7 (PFI) are unassigned in this variant per the official pin mapping table. For triple-voltage monitoring, consider the MAX6723A or MAX6727A variants, which include the RSTIN input with 626mV internal reference for externally adjustable threshold configuration.
Is the MAX6725AKAWGD3+ RoHS-compliant and lead-free?
Yes, the MAX6725AKAWGD3+ is RoHS-compliant and lead-free. The "+" suffix in the package code (K8SN+1) explicitly indicates RoHS-compliant packaging per Maxim Integrated's package nomenclature. The device meets JEDEC J-STD-020 moisture sensitivity level 1 and is qualified for reflow soldering up to 260°C peak temperature.
MAX6725AKAWGD3+ 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:
- 1.11V, 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+ FAQ
1.How can I place an order for MAX6725AKAWGD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6725AKAWGD3+ 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+ reliable?
The price and inventory of MAX6725AKAWGD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6725AKAWGD3+ is usually 5 days.
3.What payment methods are accepted for MAX6725AKAWGD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6725AKAWGD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6725AKAWGD3+?
MAX6725AKAWGD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6725AKAWGD3+ 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+?
For technical support, including MAX6725AKAWGD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6725AKAWGD3+ requirements.
6.How does Aetrix verify that MAX6725AKAWGD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6725AKAWGD3+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6725AKAWGD3+?
All MAX6725AKAWGD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6725AKAWGD3+, 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+ part is unused and in its original packaging.
Return procedure for MAX6725AKAWGD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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