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Analog Devices Inc./Maxim Integrated MAX6729KAVHD3+T
- Part No.:
- MAX6729KAVHD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6729KAVHD3+T.pdf
- Description:
- IC SUPERVISOR MPU SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,618
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Product details
Overview
MAX6729KAVHD3+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 auxiliary voltage via RSTIN (626.5mV reference). It provides push-pull active-low reset output, power-fail input/output, watchdog timer with 35s startup/1.12s normal timeout, and operates from -40°C to +85°C. It ensures reliable system boot and brownout recovery in multivoltage embedded systems.
For engineers reviewing the MAX6729KAVHD3+T datasheet, MAX6729KAVHD3+T pinout, MAX6729KAVHD3+T application, or MAX6729KAVHD3+T equivalent, key selection criteria include its triple-supply monitoring capability, guaranteed reset validity down to VCC1/VCC2 = 0.8V, push-pull RST output referenced to VCC1, PFO push-pull output referenced to VCC1, and factory-trimmed dual-threshold configuration with 210ms (min) reset timeout.
Technical Context
The MAX6729KAVHD3+T integrates three independent voltage monitors: primary (VCC1), secondary (VCC2), and auxiliary (RSTIN), each with dedicated comparators and hysteresis. Its reset logic asserts RST low when any monitored supply falls below its threshold and holds for a minimum 210ms timeout after all supplies recover.
It features a dual-mode watchdog timer-35s minimum startup period after reset, then 1.12s minimum normal timeout-and includes a power-fail comparator (PFI/PFO) with 2µs propagation delay and 3mV hysteresis. All outputs are push-pull, eliminating need for external pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±125mV tolerance); sets primary supply brownout detection point |
| VCC2 Threshold | 3.075V (factory-trimmed, ±75mV tolerance); sets secondary supply undervoltage detection |
| RSTIN Reference | 626.5mV (internal bandgap); enables precise third-voltage monitoring via resistor divider |
| Reset Timeout | 210ms (min); guarantees sufficient hold time for processor initialization and memory stabilization |
| Supply Current | 14µA (typ at 3.6V); enables ultra-low-power operation in battery-backed or energy-sensitive systems |
| Operating Temp | -40°C to +85°C; qualified for industrial and telecom equipment environments |
| Reset Output Type | Push-pull active-low RST; drives directly to µP reset pin without external pullup resistor |
| PFO Output Type | Push-pull active-low PFO referenced to VCC1; provides immediate power-fail signal without external components |
Pinout & Package
MAX6729KAVHD3+T is housed in an 8-pin SOT23-8 package (2.0mm × 2.1mm × 1.25mm), thermally enhanced for high-density PCB layouts and compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts low on any supply fault or manual reset |
| 2 | GND | System ground reference for all internal comparators and logic |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; initiates reset on logic-low pulse ≥1µs |
| 4 | PFO | Active-low push-pull power-fail output referenced to VCC1; asserts low when PFI < 626.5mV |
| 5 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal VCC2 monitor and RST2 logic |
| 6 | VCC1 | Primary supply input (1.8V–5.0V range); powers core logic, VCC1 monitor, and RST/PFO drivers |
| 7 | PFI | Power-fail input; high-impedance node for resistor-divider network to set custom power-fail threshold |
| 8 | WDI | Watchdog input; resets internal timer on rising/falling edge; triggers reset if idle >1.12s (normal) or >35s (startup) |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneous monitoring of VCC1, VCC2, and RSTIN enables full-system power integrity in SoC/FPGA platforms with multiple rails |
| Guaranteed reset validity to 0.8V | Ensures deterministic reset assertion even during deep brownout conditions where VCC1 or VCC2 drops near device operational floor |
| Dual-mode watchdog timer | 35s startup window accommodates complex boot sequences; 1.12s normal timeout detects runtime lockups without false triggers |
| Push-pull RST and PFO outputs | Eliminates external pullup resistors, reduces BOM count, and improves noise immunity vs. open-drain alternatives |
| Low 14µA supply current | Minimizes quiescent load on backup batteries or low-power LDOs in always-on subsystems |
| Immunity to short VCC transients | Withstands ≤20µs negative glitches at 100mV overdrive, preventing spurious resets in noisy power environments |
Applications
| Server Power Sequencing | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitoring 12V/5V/3.3V rails during cold start and hot-swap events in rack-mounted servers. IC Role / Device Role / Timing Role: Triple-supply supervisor enforcing strict power-up order and asserting reset until all rails stabilize above thresholds. Use Value: Prevents CPU latch-up and FPGA configuration corruption by guaranteeing 210ms reset hold time after final rail reaches 4.625V/3.075V/0.626V. | Use Scenario: Ensuring deterministic restart after brownout in programmable logic controller modules with isolated 24V field power and 5V logic rails. IC Role / Device Role / Timing Role: Dual-rail supervisor (VCC1=5V, VCC2=24V via divider) with MR-triggered fail-safe reset and PFO-driven emergency shutdown. Use Value: Guarantees reset remains asserted while either rail is below 0.8V, enabling safe state retention in volatile memory and I/O latches. |
| Medical Point-of-Care Device | 5G Small Cell Baseband Unit |
Use Scenario: Managing battery-backed 3.3V main and 1.8V sensor rails in portable diagnostic instruments with strict FDA power-integrity requirements. IC Role / Device Role / Timing Role: Low-current (14µA) triple supervisor using RSTIN to monitor backup battery voltage, with WDI tied to baseband processor for lockup detection. Use Value: Extends battery life by 30% vs. discrete solutions while providing certified brownout recovery and watchdog coverage per IEC 62304. | Use Scenario: Supervising 1.0V core, 1.8V I/O, and 3.3V analog rails in high-speed data converters and FPGAs within compact 5G small cell radios. IC Role / Device Role / Timing Role: Precision threshold supervisor (VCC1=1.0V, VCC2=1.8V, RSTIN=3.3V) with 210ms timeout ensuring stable PLL lock before RF activation. Use Value: Eliminates timing margin uncertainty in multi-rail power sequencing, reducing validation cycles by avoiding race-condition-induced boot failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6728KA+T | Identical pinout and triple-monitor architecture, but features open-drain PFO instead of push-pull | Requires external pullup on PFO; suitable where level-shifting or wired-OR is needed | Select MAX6728KA+T only if open-drain PFO is required for bus sharing or mixed-voltage interfacing |
| TPS3808G33DBVR | Dual-supply monitor (no RSTIN), fixed 3.3V VDD threshold, 200ms timeout, 2.5µA IQ | Lacks auxiliary voltage monitoring and power-fail functionality; simpler interface for single-rail systems | Choose TPS3808G33DBVR for cost-sensitive dual-rail designs without watchdog or PFI/PFO needs |
Compared with MAX6729KAVHD3+T, MAX6728KA+T offers identical supervision capability but requires external PFO pullup, increasing layout complexity; TPS3808G33DBVR reduces feature set and current draw but cannot replace triple-monitoring or power-fail functions in multirail systems.
Availability
MAX6729KAVHD3+T is available at Aetrix Electronics and suitable for server power sequencing, industrial PLC I/O modules, medical point-of-care devices, 5G small cell baseband units, and telecom line-card applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6729KAVHD3+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 industrial, communications, computing, and consumer markets.
The MAX6715–MAX6729 family was designed specifically for multivoltage microprocessor systems requiring precise, low-power, triple-rail supervision with integrated watchdog and power-fail detection in space-constrained SOT23 packages.
FAQ
What is the exact reset timeout period for MAX6729KAVHD3+T?
The MAX6729KAVHD3+T has a minimum reset timeout period of 210ms, as indicated by the "D3" suffix in its part number. This is the guaranteed minimum duration for which the RST output remains asserted after all monitored supplies (VCC1, VCC2, RSTIN) rise above their respective thresholds. The typical value is 210ms, with maximum specified at 280ms under full temperature and voltage range.
Does MAX6729KAVHD3+T support monitoring a 1.2V core supply as VCC2?
Yes, MAX6729KAVHD3+T supports VCC2 monitoring from 0.9V to 3.3V, making it fully compatible with 1.2V core supplies. Its factory-trimmed VCC2 threshold of 3.075V applies to the secondary rail, but the device's comparator architecture allows use of the RSTIN input (with 626.5mV reference) to monitor lower voltages like 1.2V via an external resistor divider, preserving accuracy and hysteresis.
How does the watchdog timer in MAX6729KAVHD3+T behave after power-up?
After power-up or any reset event, the MAX6729KAVHD3+T watchdog enters a 35s minimum startup mode. Only after the first valid WDI transition (rising or falling edge) within that window does it switch to the 1.12s minimum normal timeout mode. This prevents false timeouts during lengthy boot sequences while ensuring rapid lockup detection during steady-state operation.
Can MAX6729KAVHD3+T generate a power-fail interrupt without asserting system reset?
Yes, MAX6729KAVHD3+T provides independent power-fail signaling via the PFO output. When the PFI input falls below 626.5mV, PFO asserts low immediately-without triggering the reset timeout timer-enabling software-initiated graceful shutdown. This decouples power-fail warning from hard reset, supporting orderly data save and state preservation before critical voltage loss.
What is the function of Pin 3 (MR) on MAX6729KAVHD3+T, and what happens if left unconnected?
Pin 3 (MR) is the active-low manual reset input with a 50kΩ internal pullup to VCC1. If left unconnected, MR remains high and does not trigger reset. Pulling MR low for ≥1µs forces an immediate reset assertion for the full 210ms timeout period. No external components are required for basic operation, though a 0.1µF capacitor to GND is recommended in noisy environments for added immunity.
MAX6729KAVHD3+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:
- -
MAX6729KAVHD3+T FAQ
1.How can I place an order for MAX6729KAVHD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6729KAVHD3+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 MAX6729KAVHD3+T reliable?
The price and inventory of MAX6729KAVHD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6729KAVHD3+T is usually 5 days.
3.What payment methods are accepted for MAX6729KAVHD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6729KAVHD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6729KAVHD3+T?
MAX6729KAVHD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6729KAVHD3+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 MAX6729KAVHD3+T?
For technical support, including MAX6729KAVHD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6729KAVHD3+T requirements.
6.How does Aetrix verify that MAX6729KAVHD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6729KAVHD3+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 MAX6729KAVHD3+T meets industry standards.
7.What is the process for return or replacement of MAX6729KAVHD3+T?
All MAX6729KAVHD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6729KAVHD3+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 MAX6729KAVHD3+T part is unused and in its original packaging.
Return procedure for MAX6729KAVHD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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