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Analog Devices Inc./Maxim Integrated MAX6725KATGD3+T
- Part No.:
- MAX6725KATGD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6725KATGD3+T.pdf
- Description:
- IC SUPERVISOR MPU SOT23-8
- Quantity:
- Payment:
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Product details
Overview
MAX6725KATGD3+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (primary), VCC2 (secondary), and RSTIN (auxiliary) supply rails with factory-trimmed thresholds of 4.625V and 3.075V, 210ms reset timeout, and open-drain active-low RST/RST2 outputs. It ensures reliable system reset during brownout, power-up, or watchdog fault conditions in multivoltage embedded systems.
For engineers reviewing the MAX6725KATGD3+T datasheet, MAX6725KATGD3+T pinout, MAX6725KATGD3+T application, or MAX6725KATGD3+T equivalent, this device supports dual reset outputs, manual reset input, watchdog timer with 35s startup/1.12s normal mode, and power-fail monitoring - critical for telecom, industrial, and battery-operated equipment requiring deterministic reset behavior under low-voltage operation.
Technical Context
The MAX6725KATGD3+T integrates three independent voltage comparators: one for VCC1 (4.625V threshold), one for VCC2 (3.075V), and one for RSTIN referenced to a 626.5mV internal bandgap. Reset assertion occurs when any monitored rail falls below its threshold, and the reset output remains asserted for a guaranteed minimum 210ms after all rails recover.
It features dual open-drain reset outputs (RST and RST2), each referenced to their respective supply (VCC1 and VCC2), a manual reset input with 50kΩ internal pullup, and a watchdog input supporting long startup (≥35s) and short normal timeout (≥1.12s). The device operates down to VCC = 0.8V and draws only 14µA typical supply current at 3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±1.5% max deviation; ensures precise reset initiation on primary 5V or 4.8V rails) |
| VCC2 Threshold | 3.075V (factory-trimmed, ±1.5% max deviation; matches common 3.3V I/O or core supplies) |
| RSTIN Reference | 626.5mV (internal bandgap reference; enables external resistor-divider monitoring of third rail down to 0.62V) |
| Reset Timeout | 210ms (minimum guaranteed duration; provides sufficient hold time for µP initialization and peripheral stabilization) |
| Supply Current | 14µA typical at 3.6V (ultra-low quiescent draw; extends battery life in portable equipment without sacrificing supervision integrity) |
| Operating Temp | -40°C to +85°C (industrial-grade range; validated across full temperature span for automotive-adjacent and harsh-environment use) |
| Reset Output Type | Dual open-drain (RST referenced to VCC1, RST2 to VCC2; allows independent pullup to different voltage domains) |
Pinout & Package
MAX6725KATGD3+T is housed in an 8-pin SOT23-8 package (2.0mm × 2.1mm footprint), optimized for space-constrained PCB layouts while maintaining thermal performance and manufacturability in reflow assembly.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output referenced to VCC1; requires external pullup; asserts when VCC1/VCC2/RSTIN/MR fault or watchdog timeout occurs |
| 2 | GND | Analog/digital ground reference; must be connected to system ground plane for stable comparator operation and noise immunity |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; debounced by design; initiates reset on logic-low pulse ≥1µs |
| 4 | VCC2 | Secondary supply input (0.9V–3.3V); powers internal VCC2 comparator and RST2 output driver; defines RST2 logic high level |
| 5 | RSTIN | High-impedance auxiliary voltage monitor input; referenced to 626.5mV internal reference; used with external resistor divider for third-rail monitoring |
| 6 | VCC1 | Primary supply input (1.8V–5.0V); powers main circuitry and RST output driver; defines RST logic high level |
| 7 | RST2 | Active-low open-drain reset output referenced to VCC2; independent timing and assertion logic from RST; enables dual-domain reset signaling |
| 8 | WDI | Watchdog input; rising/falling edge clears internal timer; timeout (≥1.12s normal, ≥35s startup) triggers reset if no transition detected |
Key Features
| Feature | Design Value |
|---|---|
| Dual open-drain reset outputs | RST (VCC1-referenced) and RST2 (VCC2-referenced) enable independent reset signaling to multiple voltage domains without level-shifting components |
| Triple-supply monitoring | Simultaneous supervision of VCC1, VCC2, and RSTIN (via 626.5mV reference) eliminates need for discrete comparators or additional supervisor ICs |
| Watchdog with dual-mode timeout | 35s startup window accommodates complex boot sequences; 1.12s normal timeout ensures rapid detection of software hangs post-initialization |
| Guaranteed reset validity down to 0.8V | Ensures clean, predictable reset assertion even during deep brownout conditions where many supervisors fail or glitch |
| Low 14µA supply current | Minimizes standby power draw in always-on or battery-backed systems without compromising supervision accuracy or speed |
Applications
| Telecom Power Management | Industrial PLC Controller |
|---|---|
Use Scenario: Monitoring primary 4.8V backplane supply, secondary 3.3V FPGA I/O rail, and auxiliary 1.2V core voltage in a remote radio unit. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting coordinated reset to ARM processor and FPGA upon any rail undervoltage, with 210ms hold time ensuring firmware reload stability. Use Value: Prevents corrupted configuration writes during partial power loss, eliminating field failures caused by inconsistent state recovery across voltage domains. |
Use Scenario: Supervising 24V DC-DC converted 5V logic rail, isolated 3.3V microcontroller supply, and 2.5V analog sensor interface in a DIN-rail mounted controller. IC Role / Device Role / Timing Role: Dual open-drain RST/RST2 outputs drive separate reset lines to CPU and isolated CAN transceiver, enabling domain-specific reset sequencing. Use Value: Eliminates need for external OR-gating or level shifters, reducing BOM count and PCB area while guaranteeing simultaneous fault detection across safety-critical subsystems. |
| Portable Medical Monitor | Battery-Powered IoT Gateway |
Use Scenario: Managing Li-ion battery (3.6V nominal), regulated 3.3V MCU rail, and 1.8V display driver supply in a handheld ECG device. IC Role / Device Role / Timing Role: RSTIN monitors battery voltage via resistor divider; VCC1/VCC2 track regulated rails; MR supports clinician-initiated hard reset. Use Value: Enables graceful shutdown and data save before brownout, meeting IEC 60601-1 requirements for safe power-loss response in Class II medical devices. |
Use Scenario: Supervising 3.6V Li-SOCl₂ battery, 3.3V ESP32 host, and 1.2V LoRa transceiver supply in a remote environmental sensor node. IC Role / Device Role / Timing Role: WDI tied to ESP32 GPIO; watchdog timeout resets node on firmware lockup; ultra-low 14µA ICC extends 10-year battery life. Use Value: Achieves autonomous recovery from communication stack crashes without external intervention, reducing maintenance cost and downtime in unattended deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6726KA-T | Same 8-pin SOT23 package and triple-monitor architecture, but features push-pull RST and RST2 outputs instead of open-drain | Requires no external pullups; better suited for systems needing active-high reset signaling or driving capacitive loads directly | Select MAX6726KA-T when interfacing with µPs lacking internal pullups or when minimizing external components is prioritized over multi-rail pullup flexibility |
| TPS3808G33DBVR | Dual-supply monitor only (VDD and VDDIO), fixed 3.3V threshold, no RSTIN or watchdog; 6-pin SOT23-6 package | Lacks auxiliary rail monitoring and watchdog functionality; suitable only for simpler two-rail systems without complex boot supervision needs | Choose TPS3808G33DBVR for cost-sensitive, space-constrained designs where only primary/secondary rail supervision is required and watchdog is handled externally |
Compared with MAX6725KATGD3+T, MAX6726KA-T offers push-pull outputs for direct drive but sacrifices open-drain flexibility across voltage domains, while TPS3808G33DBVR reduces feature set and monitoring capability to meet basic dual-rail requirements at lower cost and smaller footprint.
Availability
MAX6725KATGD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control systems, and portable medical devices requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature operation.
Supply support for MAX6725KATGD3+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) is a semiconductor leader specializing in high-performance analog, mixed-signal, and power management solutions for demanding industrial, automotive, and communications applications.
The MAX6715–MAX6729 family was designed specifically for multivoltage embedded systems requiring precise, low-power, triple-rail supervision with integrated watchdog and manual reset - addressing reliability gaps in legacy single-supply supervisors.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6725KATGD3+T?
The MAX6725KATGD3+T has factory-trimmed reset thresholds of 4.625V for VCC1 and 3.075V for VCC2, with ±1.5% maximum tolerance over temperature. These values are encoded in the part number suffix "KA" per Maxim's Reset Voltage Threshold Suffix Guide and are verified across the -40°C to +85°C operating range.
Does the MAX6725KATGD3+T support watchdog functionality, and what are its timeout periods?
Yes, the MAX6725KATGD3+T includes a dual-mode watchdog timer with a minimum 35s startup period after reset and a minimum 1.12s normal timeout period. The watchdog is enabled via the WDI pin and transitions to normal mode after the first valid edge, providing robust software execution monitoring for complex boot sequences and runtime stability.
How does the RSTIN input work on the MAX6725KATGD3+T, and what voltage range can it monitor?
The RSTIN input on the MAX6725KATGD3+T is a high-impedance comparator input referenced to an internal 626.5mV bandgap voltage. When used with an external resistor divider, it enables monitoring of a third supply rail down to 0.62V. The input leakage is ±25nA, allowing high-value resistors to minimize system power consumption.
What are the key differences between the RST and RST2 outputs on the MAX6725KATGD3+T?
RST is an open-drain output referenced to VCC1 and asserts low when VCC1, VCC2, RSTIN, MR, or WDI faults occur. RST2 is a separate open-drain output referenced to VCC2, sharing the same fault detection logic but driven independently - enabling simultaneous reset signaling to circuits powered by different rails without shared pullup conflicts.
Is the MAX6725KATGD3+T compatible with 1.8V logic systems, and what is its minimum operating voltage?
Yes, the MAX6725KATGD3+T operates reliably down to VCC1 or VCC2 = 0.8V, making it fully compatible with 1.8V logic domains. Its reset outputs remain valid and well-defined at these low voltages, and its 14µA typical supply current at 3.6V scales proportionally, ensuring stable supervision in ultra-low-voltage embedded designs.
MAX6725KATGD3+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:
- -
MAX6725KATGD3+T FAQ
1.How can I place an order for MAX6725KATGD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6725KATGD3+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 MAX6725KATGD3+T reliable?
The price and inventory of MAX6725KATGD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6725KATGD3+T is usually 5 days.
3.What payment methods are accepted for MAX6725KATGD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6725KATGD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6725KATGD3+T?
MAX6725KATGD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6725KATGD3+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 MAX6725KATGD3+T?
For technical support, including MAX6725KATGD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6725KATGD3+T requirements.
6.How does Aetrix verify that MAX6725KATGD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6725KATGD3+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 MAX6725KATGD3+T meets industry standards.
7.What is the process for return or replacement of MAX6725KATGD3+T?
All MAX6725KATGD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6725KATGD3+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 MAX6725KATGD3+T part is unused and in its original packaging.
Return procedure for MAX6725KATGD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6725KATGD3+T Tags
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MIC826SYMT-TR
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