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Analog Devices Inc./Maxim Integrated MAX6725KAVDD3+T
- Part No.:
- MAX6725KAVDD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6725KAVDD3+T.pdf
- Description:
- IC SUPERVISOR MPU SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,200
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Product details
Overview
MAX6725KAVDD3+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (4.625V threshold), VCC2 (3.075V threshold), and an externally adjustable RSTIN input (626.5mV reference) for auxiliary supply monitoring down to 0.62V. It provides open-drain RST and RST2 reset outputs, manual reset input (MR), watchdog timer (35s startup / 1.12s normal timeout), and operates from -40°C to +85°C. It is used in multivoltage telecom systems requiring reliable power sequencing and brownout detection.
For engineers reviewing the MAX6725KAVDD3+T datasheet, MAX6725KAVDD3+T pinout, MAX6725KAVDD3+T application, or MAX6725KAVDD3+T equivalent, key selection criteria include dual independent reset outputs, factory-trimmed dual-threshold precision (±1.5% over temp), guaranteed reset validity down to VCC1/VCC2 = 0.8V, and integrated watchdog with long startup period for complex boot sequences.
Technical Context
The MAX6725KAVDD3+T implements a dual-threshold voltage monitoring architecture with independent comparators for VCC1 and VCC2, plus a high-impedance RSTIN comparator referenced to a 626.5mV internal bandgap. Its reset logic asserts active-low outputs when any monitored voltage falls below its threshold and holds reset for a factory-programmed 210ms (min) timeout after recovery.
It integrates a dual-mode watchdog timer: a 35s (min) initial timeout after any reset event enables full system initialization, followed by a 1.12s (min) normal-mode timeout triggered by WDI edge transitions. The MR input features a 50kΩ internal pullup and 1µs minimum pulse width requirement, while RST and RST2 outputs are independently configured as open-drain with separate VCC1/VCC2 referencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (factory-trimmed, ±1.5% over -40°C to +85°C); ensures reliable reset assertion during 5V rail brownout. |
| VCC2 Reset Threshold | 3.075V (factory-trimmed, ±1.5% over -40°C to +85°C); supports precise monitoring of 3.3V I/O or core rails. |
| RSTIN Reference Voltage | 626.5mV (internal bandgap, ±15mV); enables accurate external resistor-divider setup for third-supply monitoring. |
| Reset Timeout Period | 210ms (minimum); guarantees sufficient hold time for processor initialization and peripheral stabilization. |
| Supply Current | 14µA (typical at 3.6V); enables ultra-low-power operation in battery-backed or energy-sensitive systems. |
| Watchdog Timeout | 1.12s (normal mode, min); provides rapid fault detection during runtime without false triggers during valid software loops. |
| Operating Temperature | -40°C to +85°C; qualified for industrial and telecom equipment deployed in uncontrolled environments. |
Pinout & Package
MAX6725KAVDD3+T is housed in an 8-pin SOT23 package (3.0mm × 1.7mm × 1.3mm height), optimized for space-constrained PCB layouts in portable and networking equipment.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output referenced to VCC1; requires external pullup; asserts on VCC1/VCC2/RSTIN undervoltage or MR low. |
| 2 | GND | Analog/digital ground reference for all internal comparators and logic; must be low-impedance connection to system ground plane. |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; 1µs minimum pulse width; debounced internally. |
| 4 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal VCC2 comparator and references RST2 output. |
| 5 | RSTIN/PFI | Shared pin for adjustable reset monitor (RSTIN) or power-fail input (PFI); 626.5mV internal reference; high-impedance (±25nA). |
| 6 | VCC1 | Primary supply input (1.8V–5.0V range); powers device core and references RST output; reset valid down to 0.8V. |
| 7 | RST2 | Active-low open-drain reset output referenced to VCC2; independent timing but same assertion logic as RST. |
| 8 | WDI | Watchdog input; rising/falling edge clears timer; long (35s) startup mode followed by short (1.12s) runtime mode. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent open-drain reset outputs | RST (VCC1-referenced) and RST2 (VCC2-referenced) enable simultaneous reset control of mixed-voltage subsystems without level-shifting. |
| Factory-trimmed dual-threshold precision | VCC1 = 4.625V ±1.5%, VCC2 = 3.075V ±1.5% over full temperature range - eliminates need for external calibration in production. |
| Guaranteed reset validity down to 0.8V | Ensures deterministic reset behavior during deep brownout conditions where many supervisors fail or glitch. |
| Integrated dual-mode watchdog timer | 35s startup timeout allows full BIOS/OS boot before enabling 1.12s runtime supervision - prevents spurious resets during initialization. |
| Low 14µA supply current | Reduces quiescent power in always-on monitoring paths, critical for battery-backed real-time clocks and backup controllers. |
Applications
| Telecom Line Card Power Monitoring | Industrial PLC Dual-Rail Sequencing |
|---|---|
|
Use Scenario: Monitoring 48V DC-DC converted 5V and 3.3V rails on carrier-grade line cards subject to lightning-induced transients. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting coordinated RST and RST2 to halt CPU and FPGA simultaneously during undervoltage events. Use Value: Prevents corrupted firmware writes and latch-up by enforcing 210ms minimum reset hold time across both voltage domains. |
Use Scenario: Ensuring safe startup/shutdown sequence between 24V field I/O and 5V logic rails in programmable logic controllers. IC Role / Device Role / Timing Role: Independent VCC1/VCC2 monitoring with RST2 tied to I/O power domain and RST to CPU domain. Use Value: Eliminates need for discrete RC timers or dual supervisors - reduces BOM count and layout area by 40%. |
| Network Switch ASIC Initialization | Medical Imaging Sensor Module |
|
Use Scenario: Validating stable 1.2V core and 1.8V I/O supplies before releasing reset to high-performance switch ASICs. IC Role / Device Role / Timing Role: RSTIN used to monitor auxiliary 1.0V analog bias rail via resistor divider; all three thresholds trigger unified reset. Use Value: 626.5mV RSTIN reference enables accurate sub-1V monitoring without external reference ICs. |
Use Scenario: Supervising battery-backed 3.3V logic and 5.0V sensor excitation rails in portable ultrasound probes. IC Role / Device Role / Timing Role: MR input connected to emergency shutdown button; WDI driven by sensor acquisition firmware loop. Use Value: 1.12s watchdog timeout detects firmware hangs during analog signal capture without disrupting real-time sampling. |
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 D3+T | Same pinout and specs, but features push-pull RST and RST2 outputs instead of open-drain. | Eliminates need for external pullup resistors; better suited for driving CMOS inputs directly without level shifters. | Select MAX6726KA D3+T when interfacing with voltage-tolerant µPs or when board space precludes adding pullups. |
| TPS3808G33DBVR | Dual-supply monitor only (no RSTIN/PFI), fixed 3.3V VDD threshold, 200ms timeout, no watchdog or MR. | Lacks third-supply monitoring, manual reset, and watchdog - suitable only for simpler two-rail systems. | Choose TPS3808G33DBVR only if RSTIN, WDI, and MR functions are unused and cost is primary constraint. |
Compared with MAX6725KAVDD3+T, MAX6726KA D3+T offers push-pull drive for reduced component count, while TPS3808G33DBVR sacrifices triple-monitoring and supervision features for lower unit cost in basic dual-rail applications.
Availability
MAX6725KAVDD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and medical imaging equipment requiring stable component supply, long-lifecycle support, and guaranteed reset performance under brownout conditions.
Supply support for MAX6725KAVDD3+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 company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, communications, and computing applications.
The MAX6715–MAX6729 family was designed specifically for multivoltage embedded systems needing compact, accurate, and feature-rich power supervision - including triple monitoring, dual reset outputs, and intelligent watchdog timing.
FAQ
What is the exact reset timeout period for MAX6725KAVDD3+T?
The MAX6725KAVDD3+T has a factory-programmed minimum reset timeout period of 210ms, as indicated by the "D3" suffix in its part number. This value is guaranteed over the full -40°C to +85°C operating temperature range and ensures sufficient reset assertion time for processor and peripheral initialization before release.
Does MAX6725KAVDD3+T support monitoring a 1.0V auxiliary supply?
Yes, MAX6725KAVDD3+T supports monitoring a 1.0V auxiliary supply via its RSTIN pin using an external resistor divider. With a 626.5mV internal reference, a simple two-resistor network sets the trip point precisely - for example, R1 = 620kΩ and R2 = 1MΩ yields a 1.0V threshold with <0.5% error.
How does the watchdog timer behave after power-up in MAX6725KAVDD3+T?
After power-up or any reset event, MAX6725KAVDD3+T enters a 35s (minimum) long-startup watchdog mode. Only after the first valid WDI edge transition does it switch to the 1.12s (minimum) normal-mode timeout - preventing false resets during lengthy boot sequences while ensuring rapid fault detection during runtime.
Can MAX6725KAVDD3+T operate with VCC1 = 2.5V and VCC2 = 1.8V?
Yes, MAX6725KAVDD3+T fully supports VCC1 = 2.5V and VCC2 = 1.8V. Its VCC1 monitor range is 1.8V–5.0V and VCC2 range is 0.9V–3.3V. Reset outputs remain valid down to either supply reaching 0.8V, and supply current remains below 15µA at these voltages per datasheet specifications.
What is the function of the RSTIN/PFI pin on MAX6725KAVDD3+T?
The RSTIN/PFI pin on MAX6725KAVDD3+T serves a dual role: as RSTIN, it monitors an auxiliary voltage via resistor divider against a 626.5mV reference; as PFI, it enables power-fail detection with corresponding PFO output. The function is determined by internal configuration - MAX6725 defaults to RSTIN mode per its selector guide entry.
MAX6725KAVDD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- 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:
- -
MAX6725KAVDD3+T FAQ
1.How can I place an order for MAX6725KAVDD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6725KAVDD3+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 MAX6725KAVDD3+T reliable?
The price and inventory of MAX6725KAVDD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6725KAVDD3+T is usually 5 days.
3.What payment methods are accepted for MAX6725KAVDD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6725KAVDD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6725KAVDD3+T?
MAX6725KAVDD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6725KAVDD3+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 MAX6725KAVDD3+T?
For technical support, including MAX6725KAVDD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6725KAVDD3+T requirements.
6.How does Aetrix verify that MAX6725KAVDD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6725KAVDD3+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 MAX6725KAVDD3+T meets industry standards.
7.What is the process for return or replacement of MAX6725KAVDD3+T?
All MAX6725KAVDD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6725KAVDD3+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 MAX6725KAVDD3+T part is unused and in its original packaging.
Return procedure for MAX6725KAVDD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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