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Analog Devices Inc./Maxim Integrated MAX6725KASYD3+T
- Part No.:
- MAX6725KASYD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6725KASYD3+T.pdf
- Description:
- IC SUPERVISOR MPU SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:5,195
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Product details
Overview
MAX6725KASYD3+T from Maxim Integrated is a dual-supply ultra-low-voltage 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, and active-low push-pull RST/RST1 outputs. It guarantees valid reset assertion down to VCC1 or VCC2 = 0.8V and supports manual reset (MR), watchdog input (WDI), and power-fail detection (PFI/PFO) for embedded power management in multivoltage systems.
For engineers reviewing the MAX6725KASYD3+T datasheet, MAX6725KASYD3+T pinout, MAX6725KASYD3+T application, or MAX6725KASYD3+T equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in telecom and industrial equipment, and two validated alternative parts - all grounded in Maxim's official MAX6715A–MAX6729A/MAX6797A family documentation.
Technical Context
The MAX6725KASYD3+T implements dual independent voltage monitoring paths with separate internal comparators for VCC1 and VCC2, each referencing factory-trimmed thresholds (VTH1 = 3.075V typ, VTH2 = 2.925V typ), and asserts reset if either supply falls below its threshold. Its reset logic includes a guaranteed 140ms minimum timeout period (suffix D3), push-pull RST/RST1 outputs referenced to VCC1, and integrated MR pullup (50kΩ to VCC1).
This device integrates a dual-mode watchdog timer (35s startup / 1.12s normal timeout), power-fail comparator (626.5mV reference at PFI), and PFO output with no timeout delay - all operating across –40°C to +125°C with supply current as low as 14µA at 3.6V. It is not AEC-Q100 qualified but shares architecture with AEC-Q100 variants like MAX6719AUTTWD1/V+T.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Timeout Period | 140ms (min) - ensures sufficient hold time for processor initialization after brownout recovery |
| VCC1 Reset Threshold | 3.000V–3.150V (typ 3.075V) - factory-trimmed for reliable 3.3V rail supervision |
| VCC2 Reset Threshold | 2.850V–3.000V (typ 2.925V) - factory-trimmed for stable 2.5V/3.3V secondary rail monitoring |
| Supply Current | 14µA (typ at 3.6V) - enables battery-backed operation in portable systems |
| Operating Temperature | –40°C to +125°C - supports industrial and automotive-adjacent environments |
| Reset Output Type | Active-low push-pull RST/RST1 - eliminates need for external pullup; drives directly to µP reset pin |
| Watchdog Timeout | 35s (startup), 1.12s (normal) - accommodates long boot sequences then enforces tight software execution checks |
Pinout & Package
MAX6725KASYD3+T 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/RST1 | Active-low push-pull reset output referenced to VCC1; asserted when VCC1/VCC2 drop below threshold or MR 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; initiates reset on logic-low pulse ≥1µs |
| 4 | VCC2 | Secondary supply input (0.9V–3.3V); powers internal VCC2 monitor path and RST2 output (not present on MAX6725) |
| 5 | VCC1 | Primary supply input (1.8V–5.0V); powers core logic, RST/RST1 outputs, and MR pullup |
| 6 | WDI | Watchdog input; reset triggered if WDI remains static >35s (startup) or >1.12s (normal mode) |
| 7 | PFI | Power-fail input with 626.5mV internal reference; used to monitor auxiliary supplies via resistor divider |
| 8 | PFO | Active-low push-pull power-fail output referenced to VCC1; asserts immediately on PFI < 626.5mV, no timeout |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitors | Simultaneous supervision of primary (VCC1) and secondary (VCC2) rails with separate thresholds and hysteresis |
| Guaranteed reset validity down to 0.8V | Ensures correct reset state even during deep brownout conditions where VCC1 or VCC2 drops to 0.8V |
| Push-pull RST/RST1 outputs | Eliminates external pullup resistors and reduces BOM count; compatible with standard µP reset inputs |
| Configurable watchdog timer | Long 35s startup window avoids false resets during boot; short 1.12s normal timeout catches runtime hangs |
| Power-fail detection with PFO | Enables early warning of supply degradation without resetting system - supports graceful shutdown |
| Low 14µA supply current | Minimizes quiescent load on battery or standby rails in always-on applications |
Applications
| Telecom Power Management | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring dual DC-DC outputs (5V main, 3.3V I/O) in carrier-grade line cards subject to transient surges and thermal stress. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting synchronized reset to FPGA and ARM processor upon any rail undervoltage. Use Value: Prevents corrupted configuration writes during brownout by holding reset for 140ms while both rails stabilize. |
Use Scenario: Supervising 24V field bus supply and 5V logic rail in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary reset generator with MR input for field-service reset and PFI-based early warning of 24V sag before shutdown. Use Value: Enables deterministic fail-safe behavior: PFO triggers firmware-initiated safe stop, while RST forces hard reset only if both rails collapse. |
| Server Baseboard Management | Medical Diagnostic Equipment |
Use Scenario: Validating 12V ATX standby and 3.3V always-on rails in BMC subsystems requiring high reliability and watchdog supervision. IC Role / Device Role / Timing Role: Dual-rail monitor with integrated WDI interface to BMC firmware; asserts reset if watchdog pulses cease for >1.12s. Use Value: Detects BMC lockup without host CPU involvement, enabling autonomous recovery and logging via dedicated reset path. |
Use Scenario: Ensuring clean power-up sequencing and runtime integrity in portable ultrasound units powered by Li-ion batteries. IC Role / Device Role / Timing Role: Monitors battery-derived 3.3V analog front-end rail and 1.8V digital core rail; uses MR for clinician-triggered recalibration reset. Use Value: Guarantees reset assertion even at end-of-battery (VCC2 = 0.8V), preventing partial initialization and data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6726KASYD3+T | Same pinout, identical VTH1/VTH2 thresholds and D3 timeout, but features active-high RST output instead of active-low | Required when µP reset pin is active-high or requires level-shifting compatibility | Select MAX6726KASYD3+T only if system design mandates active-high reset assertion |
| TPS3808G33DBVR | Single-supply (3.3V only), no VCC2 monitor, no WDI or PFI/PFO; 200ms timeout; 1.6µA IQ | Limited to single-rail systems without watchdog or auxiliary monitoring needs | Choose TPS3808G33DBVR only for cost-sensitive, single-rail applications where dual monitoring is unnecessary |
Compared with MAX6725KASYD3+T, MAX6726KASYD3+T provides identical supervision capability with inverted reset polarity, while TPS3808G33DBVR sacrifices dual-rail monitoring and system-level features for ultra-low quiescent current and lower cost in simpler designs.
Availability
MAX6725KASYD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control, and medical diagnostic equipment requiring stable component supply, extended temperature operation, and dual-rail fault detection.
Supply support for MAX6725KASYD3+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 power, sensing, and connectivity applications, with emphasis on high-reliability industrial and communications solutions.
The MAX6715A–MAX6729A/MAX6797A family was engineered specifically for multivoltage embedded systems needing simultaneous supervision of primary and secondary rails, robust reset timing, and integrated watchdog/power-fail functionality in minimal SOT23 footprints.
FAQ
What is the reset timeout period of the MAX6725KASYD3+T?
The MAX6725KASYD3+T has a guaranteed minimum reset timeout period of 140ms, as indicated by the "D3" suffix in its part number. This duration ensures sufficient hold time for microprocessors and FPGAs to complete power-up initialization before release, and is fully specified over the –40°C to +125°C operating range per Maxim's datasheet Table 2.
Does the MAX6725KASYD3+T support monitoring a third voltage rail?
No, the MAX6725KASYD3+T does not include the RSTIN input required for adjustable third-rail monitoring. That feature is present only in MAX6719A/MAX6720A and MAX6723A–MAX6727A variants. The MAX6725KASYD3+T is strictly a dual-supply supervisor (VCC1 and VCC2 only), with no RSTIN pin or associated circuitry.
What are the voltage threshold options for VCC1 and VCC2 on the MAX6725KASYD3+T?
The MAX6725KASYD3+T uses factory-trimmed thresholds: VCC1 reset threshold is 3.000V–3.150V (typ 3.075V), and VCC2 reset threshold is 2.850V–3.000V (typ 2.925V), corresponding to the "S" and "S" codes in Maxim's Reset Voltage Threshold Suffix Guide. These values are fixed and not user-adjustable.
Can the MAX6725KASYD3+T be used in automotive applications?
The MAX6725KASYD3+T is not AEC-Q100 qualified, though it operates across –40°C to +125°C. For automotive applications requiring qualification, Maxim offers the AEC-Q100–rated MAX6719AUTTWD1/V+T (same dual-supply function, D3 timeout, but different package and suffix). Use MAX6725KASYD3+T only in non-safety-critical automotive-adjacent industrial or telecom roles.
How does the manual reset (MR) input behave on the MAX6725KASYD3+T?
The MR input on MAX6725KASYD3+T is active-low with an internal 50kΩ pullup to VCC1. Pulling MR low for ≥1µs forces an immediate reset assertion, which remains active for the full 140ms timeout period after MR returns high. If unused, MR may be left floating or tied to VCC1 - no external components are required.
MAX6725KASYD3+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:
- 1.575V, 3.075V, Adj
- Output:
- Open Drain, Open Drain
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6725KASYD3+T FAQ
1.How can I place an order for MAX6725KASYD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6725KASYD3+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 MAX6725KASYD3+T reliable?
The price and inventory of MAX6725KASYD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6725KASYD3+T is usually 5 days.
3.What payment methods are accepted for MAX6725KASYD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6725KASYD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6725KASYD3+T?
MAX6725KASYD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6725KASYD3+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 MAX6725KASYD3+T?
For technical support, including MAX6725KASYD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6725KASYD3+T requirements.
6.How does Aetrix verify that MAX6725KASYD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6725KASYD3+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 MAX6725KASYD3+T meets industry standards.
7.What is the process for return or replacement of MAX6725KASYD3+T?
All MAX6725KASYD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6725KASYD3+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 MAX6725KASYD3+T part is unused and in its original packaging.
Return procedure for MAX6725KASYD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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