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Analog Devices Inc./Maxim Integrated MAX6725KAZWD3+T
- Part No.:
- MAX6725KAZWD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6725KAZWD3+T.pdf
- Description:
- IC SUPERVISOR MPU SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,545
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Product details
Overview
MAX6725KAZWD3+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (1.62V threshold), VCC2 (2.313V threshold), and RSTIN (626.5mV reference) with 210ms reset timeout, watchdog timer, manual reset input, and power-fail detection - used to ensure reliable boot and brownout recovery in multivoltage embedded systems.
For engineers reviewing the MAX6725KAZWD3+T datasheet, MAX6725KAZWD3+T pinout, MAX6725KAZWD3+T application, or MAX6725KAZWD3+T equivalent, key selection criteria include dual open-drain reset outputs (RST/RST2), 14µA typical supply current at 3.6V, guaranteed reset validity down to VCC1 or VCC2 = 0.8V, and compatibility with 0.62V–3.3V auxiliary voltage monitoring via RSTIN.
Technical Context
The MAX6725KAZWD3+T implements independent dual-voltage monitoring with factory-trimmed thresholds for VCC1 and VCC2, plus an externally adjustable third channel via high-impedance RSTIN referenced to a 626.5mV internal bandgap. It integrates a dual-mode watchdog timer (35s startup / 1.12s normal mode) and active-low manual reset with 50kΩ internal pullup.
Its reset logic asserts both RST (push-pull, referenced to VCC1) and RST2 (push-pull, referenced to VCC2) low upon any fault condition - including VCC1/VCC2 undervoltage, RSTIN drop below threshold, MR assertion, or watchdog timeout - and holds for a guaranteed minimum 210ms after all monitored voltages recover.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 1.620V (typ), factory-trimmed Z-suffix; ensures reliable reset assertion when primary supply drops below nominal 1.8V rail |
| VCC2 Reset Threshold | 2.313V (typ), factory-trimmed Z-suffix; monitors secondary 2.5V or 3.3V domain with ±0.5% hysteresis |
| RSTIN Threshold | 626.5mV (typ), internal reference; enables precise external resistor-divider setup for third-supply monitoring down to 0.62V |
| Reset Timeout Period | 210ms (min), D3-suffix; provides sufficient hold time for processor initialization and peripheral stabilization |
| Supply Current | 14µA (typ) at 3.6V; enables long battery life in portable equipment without compromising supervision accuracy |
| Watchdog Timeout | 1.12s (min) normal mode; detects software hangs within sub-second window after system boot completes |
| Operating Temperature | -40°C to +85°C; qualified for industrial-grade embedded applications with no derating required |
Pinout & Package
MAX6725KAZWD3+T is housed in an 8-pin SOT23-8 package (2.0mm × 2.1mm × 1.25mm), optimized for space-constrained PCB layouts while supporting dual push-pull reset outputs and full triple-supply supervision functionality.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts during any fault and holds for 210ms timeout |
| 2 | GND | System ground reference for all internal comparators, timers, and output drivers |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; forces reset when pulled low |
| 4 | PFO | Active-low power-fail output (push-pull, VCC1-referenced); asserts independently of reset when PFI < 626.5mV |
| 5 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal circuitry and sets VCC2 reset threshold |
| 6 | VCC1 | Primary supply input (1.8V–5.0V range); powers device core and defines RST output reference |
| 7 | PFI | Power-fail comparator input; high-impedance node for setting external trip point using resistor divider |
| 8 | RST2 | Active-low push-pull reset output referenced to VCC2; provides independent reset signaling for secondary domain |
Key Features
| Feature | Design Value |
|---|---|
| Dual push-pull reset outputs | RST (VCC1-referenced) and RST2 (VCC2-referenced) eliminate need for external pullups and support independent domain reset signaling |
| Triple-supply monitoring | Simultaneous supervision of VCC1, VCC2, and RSTIN/PFI enables robust power sequencing in SoC/FPGA systems with >2 rails |
| Dual-mode watchdog timer | 35s initial timeout allows full system boot; 1.12s normal timeout detects runtime lockups without false triggers |
| Guaranteed reset validity to 0.8V | Ensures correct reset state even during deep brownout conditions where VCC1 or VCC2 dips near 0.8V |
| Low 14µA supply current | Minimizes quiescent load on battery-backed or energy-harvested supplies without sacrificing response speed |
Applications
| Industrial PLC Controllers | Network Router Power Management |
|---|---|
Use Scenario: Monitoring 3.3V I/O, 1.8V core, and 12V auxiliary bias rails in DIN-rail mounted controllers exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting coordinated reset across CPU, FPGA, and analog front-end during rail collapse or slow start-up. Use Value: Prevents firmware corruption by holding reset until all three rails stabilize above their respective thresholds for ≥210ms. |
Use Scenario: Ensuring clean boot sequence in multi-core networking SoCs powered by isolated DC/DC converters with varying ramp rates. IC Role / Device Role / Timing Role: Simultaneous VCC1 (core), VCC2 (I/O), and RSTIN (PHY bias) supervision with independent reset outputs for domain isolation. Use Value: Eliminates need for discrete supervisors per rail, reducing BOM count and PCB area while maintaining timing integrity. |
| Medical Diagnostic Handhelds | Automotive Infotainment Modules |
Use Scenario: Battery-powered ultrasound probe with Li-ion (3.0–4.2V), LDO-regulated 1.2V sensor bias, and 2.8V display interface rails. IC Role / Device Role / Timing Role: Supervising main battery, analog sensor supply, and digital interface supply with programmable RSTIN threshold for custom bias monitoring. Use Value: Enables single-chip supervision of non-standard rail combinations, avoiding custom ASIC or FPGA-based solutions. |
Use Scenario: In-vehicle infotainment head unit requiring fail-safe reset coordination between application processor, GPU, and CAN transceiver supplies. IC Role / Device Role / Timing Role: Using PFO to trigger early warning interrupt before full reset, allowing graceful OS shutdown prior to power loss. Use Value: Provides deterministic power-fail signaling with 2µs propagation delay, enabling software-controlled data preservation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6726KAZWD3+T | Single push-pull RST output (no RST2); identical thresholds, timeout, and feature set otherwise | Lacks independent VCC2-referenced reset signal; unsuitable for systems requiring domain-isolated reset assertion | Select MAX6726KAZWD3+T only if RST2 is unused and board layout prioritizes pin count reduction over dual-domain control |
| TPS3808G33DBVR | Dual-voltage monitor only (VDD1/VDD2); no RSTIN, PFI, or watchdog; 300ms timeout; SOT23-6 package | Cannot supervise third rail or provide power-fail warning; lacks manual reset and watchdog safety features | Choose TPS3808G33DBVR for cost-sensitive dual-rail applications where auxiliary monitoring and watchdog are unnecessary |
Compared with MAX6726KAZWD3+T and TPS3808G33DBVR, the MAX6725KAZWD3+T uniquely delivers dual push-pull reset outputs, RSTIN-adjustable third-rail supervision, and integrated watchdog - making it the only option among the three that fully supports triple-rail, domain-isolated, and safety-critical embedded designs.
Availability
MAX6725KAZWD3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, medical diagnostic handhelds, and automotive infotainment modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6725KAZWD3+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 leadership in supervisory, PMIC, and interface solutions.
The MAX6715–MAX6729 family was engineered specifically for multivoltage embedded systems needing compact, ultra-low-power, triple-rail supervision with integrated watchdog and power-fail alerting - targeting telecom, industrial, and portable equipment markets.
FAQ
What is the exact reset timeout period of the MAX6725KAZWD3+T?
The MAX6725KAZWD3+T has a guaranteed minimum reset timeout period of 210ms, corresponding to the D3 suffix in its part number. This value is specified across the full -40°C to +85°C operating temperature range and ensures sufficient hold time for processor initialization and peripheral stabilization before release.
Does the MAX6725KAZWD3+T support monitoring a 1.2V supply as VCC2?
Yes, the MAX6725KAZWD3+T supports VCC2 monitoring from 0.9V to 3.3V. Its factory-trimmed Z-suffix VCC2 threshold of 2.313V is compatible with 1.2V supplies when used with appropriate external resistor scaling on RSTIN - but direct VCC2 = 1.2V operation requires verifying that the actual VCC2 voltage remains above the 0.8V minimum for guaranteed reset validity.
How does the watchdog timer behave during system startup on the MAX6725KAZWD3+T?
The MAX6725KAZWD3+T implements a dual-mode watchdog: after any reset event (power-up, brownout, MR, or watchdog timeout), it enters a 35s minimum startup mode to allow full system boot. Once the first valid WDI transition occurs, it switches to 1.12s minimum normal mode - preventing premature timeouts during initialization while ensuring rapid hang detection thereafter.
Can the MAX6725KAZWD3+T generate a power-fail interrupt without asserting system reset?
Yes, the MAX6725KAZWD3+T provides independent PFO (power-fail output) functionality. When PFI falls below 626.5mV, PFO asserts low immediately - with only 2µs propagation delay - without triggering the reset timeout or affecting RST/RST2 states, enabling software-initiated graceful shutdown before critical power loss.
What is the function of Pin 8 (RST2) on the MAX6725KAZWD3+T?
Pin 8 (RST2) is an active-low push-pull reset output referenced to VCC2. It asserts simultaneously with RST during any fault condition (VCC1/VCC2 undervoltage, MR, RSTIN, or watchdog timeout) but maintains its logic level relative to the secondary supply - enabling safe reset signaling in systems where VCC2 powers isolated domains such as analog sensors or communication interfaces.
MAX6725KAZWD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6725KAZWD3+T FAQ
1.How can I place an order for MAX6725KAZWD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6725KAZWD3+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 MAX6725KAZWD3+T reliable?
The price and inventory of MAX6725KAZWD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6725KAZWD3+T is usually 5 days.
3.What payment methods are accepted for MAX6725KAZWD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6725KAZWD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6725KAZWD3+T?
MAX6725KAZWD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6725KAZWD3+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 MAX6725KAZWD3+T?
For technical support, including MAX6725KAZWD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6725KAZWD3+T requirements.
6.How does Aetrix verify that MAX6725KAZWD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6725KAZWD3+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 MAX6725KAZWD3+T meets industry standards.
7.What is the process for return or replacement of MAX6725KAZWD3+T?
All MAX6725KAZWD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6725KAZWD3+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 MAX6725KAZWD3+T part is unused and in its original packaging.
Return procedure for MAX6725KAZWD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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