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Analog Devices Inc./Maxim Integrated MAX6729KAVDD3+
- Part No.:
- MAX6729KAVDD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6729KAVDD3+.pdf
- Description:
- POWER SUPPLY MANAGEMENT CIRCUIT,
- Quantity:
- Payment:
- Shipping:
Inventory:714
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Product details
Overview
MAX6729KAVDD3+ 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 (RST), manual reset input (MR), watchdog timer (35s startup / 1.12s normal timeout), and power-fail input/output (PFI/PFO) with push-pull PFO. Designed for multivoltage embedded systems requiring reliable brownout detection and orderly shutdown.
For engineers reviewing the MAX6729KAVDD3+ datasheet, MAX6729KAVDD3+ pinout, MAX6729KAVDD3+ application, or MAX6729KAVDD3+ equivalent, key selection criteria include its triple-supply monitoring capability, guaranteed reset validity down to VCC1/VCC2 = 0.8V, 14µA typical supply current at 3.6V, push-pull RST and PFO outputs, and factory-trimmed dual-threshold configuration (VTH1 = 4.625V, VTH2 = 3.075V) with 210ms minimum reset timeout.
Technical Context
The MAX6729KAVDD3+ integrates three independent voltage monitors: primary (VCC1), secondary (VCC2), and auxiliary (RSTIN), each with dedicated comparators referenced to precision internal bandgap references. Its dual-mode watchdog uses a 35s minimum startup period followed by a 1.12s minimum normal timeout, triggered by WDI edge transitions.
It features push-pull RST and PFO outputs referenced to VCC1, a 50kΩ internal MR pullup, and a power-fail comparator with 2µs propagation delay from PFI to PFO. The device operates across -40°C to +85°C and guarantees valid reset logic state as long as either VCC1 or VCC2 remains ≥ 0.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (factory-trimmed, ±125mV tolerance); ensures reliable reset assertion during 5V rail brownout |
| VCC2 Reset Threshold | 3.075V (factory-trimmed, ±75mV tolerance); supports stable monitoring of 3.3V I/O or core rails |
| RSTIN Reference Voltage | 626.5mV (±15.5mV); enables precise external resistor-divider setup for third-voltage monitoring down to 0.62V |
| Reset Timeout Period | 210ms (minimum); provides sufficient hold time for processor initialization and peripheral stabilization |
| Supply Current | 14µA (typical at 3.6V); minimizes quiescent power draw in battery-operated or always-on systems |
| Watchdog Timeout | 1.12s (normal mode, min); fast fault detection after system boot completes |
| Operating Temperature | -40°C to +85°C; qualified for industrial and telecom equipment environments |
Pinout & Package
MAX6729KAVDD3+ is housed in an 8-pin SOT23-8 package (2.0mm × 2.1mm, 0.65mm pitch), optimized for space-constrained PCB layouts while supporting full triple-supply supervision with dedicated PFI/PFO and WDI functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts when any monitored supply fails or MR/WDI triggers |
| 2 | GND | Ground reference for all internal circuits and comparators |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; debounced by design, no external RC needed |
| 4 | PFO | Active-low push-pull power-fail output referenced to VCC1; asserts independently of reset timeout when PFI < 626.5mV |
| 5 | PFI | Power-fail monitor input; high-impedance node for resistor-divider network to set custom power-fail trip point |
| 6 | RSTIN | Auxiliary voltage monitor input; referenced to 626.5mV internal reference for third-supply undervoltage detection |
| 7 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal circuitry when > VCC1 and sets VTH2 threshold |
| 8 | VCC1 | Primary supply input (1.8V–5.0V range); powers device when > VCC2 and sets VTH1 threshold |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-trimmed thresholds | VTH1 = 4.625V (for 5V rails), VTH2 = 3.075V (for 3.3V rails); eliminates external resistor calibration and improves production yield |
| Triple-supply monitoring architecture | Simultaneous VCC1, VCC2, and RSTIN monitoring with independent comparators; enables single-chip supervision of CPU, I/O, and auxiliary rails |
| Push-pull RST and PFO outputs | No external pull-up required; reduces BOM count and improves noise immunity in high-speed digital systems |
| Dual-mode watchdog timer | 35s startup window allows full system boot before enabling 1.12s fault detection; prevents false resets during initialization |
| Guaranteed reset validity to 0.8V | Ensures clean reset assertion even during deep brownout conditions where VCC1 or VCC2 drops to 0.8V |
Applications
| Telecom Line Cards | Industrial PLC Controllers |
|---|---|
Use Scenario: Monitoring 48V DC-to-DC converted 5V/3.3V/1.8V rails powering FPGA, PHY, and MCU on carrier-grade line cards. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting coordinated reset across power domains and triggering PFO-based early warning for software-controlled graceful shutdown. Use Value: Prevents data corruption during AC mains interruption by detecting 5V rail collapse (VCC1) and initiating controlled deactivation before 3.3V (VCC2) and 1.8V (RSTIN) fail. |
Use Scenario: Supervising isolated 24V-to-5V/3.3V/2.5V supplies in programmable logic controllers exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary system supervisor providing MR-triggered field service reset, watchdog-monitored firmware execution, and PFI-based backup battery low-voltage alert. Use Value: Enables deterministic recovery from lockups via WDI edge detection and extends operational uptime using PFO interrupt to initiate nonvolatile memory save before power loss. |
| Network Attached Storage (NAS) | Medical Diagnostic Imaging Systems |
Use Scenario: Managing redundant 12V/5V/3.3V power paths in multi-bay NAS enclosures with hot-swap capability and RAID controller supervision. IC Role / Device Role / Timing Role: Centralized voltage integrity monitor asserting RST to ARM SoC and PFO to baseboard management controller (BMC) upon any rail deviation. Use Value: Ensures atomic disk spin-down and cache flush by synchronizing hardware reset (RST) and firmware-level power-fail response (PFO) within 2µs propagation delay. |
Use Scenario: Supervising critical 5V analog front-end, 3.3V digital control, and 1.2V FPGA core supplies in MRI/X-ray subsystems requiring zero-reset-failure reliability. IC Role / Device Role / Timing Role: Safety-critical supervisory IC with guaranteed reset behavior down to 0.8V and 210ms timeout ensuring full ADC calibration completion before reset release. Use Value: Meets IEC 62304 Class C software safety requirements by eliminating race conditions between power sequencing and reset deassertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor 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; same VTH1/VTH2 and timeout | Requires external pull-up on PFO for logic-high level translation; suitable where PFO must interface with mixed-voltage logic families | Select MAX6728KA+T only if open-drain PFO is required for level-shifting or wired-OR configurations |
| TPS3808G33DBVR | Dual-supply monitor (no RSTIN/PFI); fixed 3.3V VDD threshold; 200ms timeout; 1.6µA supply current; SOT23-6 package | Lacks auxiliary voltage monitoring and power-fail functionality; limited to two-rail systems without watchdog or manual reset | Choose TPS3808G33DBVR only for cost-sensitive dual-rail applications where RSTIN, PFI, and WDI are unused |
Compared with MAX6729KAVDD3+, MAX6728KA+T offers identical supervision capability but requires external PFO pull-up, while TPS3808G33DBVR reduces feature set and package size at the expense of triple-supply coverage and integrated power-fail signaling - making MAX6729KAVDD3+ the only option supporting full three-rail coordination with autonomous PFO-driven shutdown.
Availability
MAX6729KAVDD3+ is available at Aetrix Electronics and suitable for telecom line cards, industrial PLC controllers, network attached storage, and medical diagnostic imaging systems requiring stable component supply, long-term lifecycle support, and guaranteed factory-trimmed voltage thresholds.
Supply support for MAX6729KAVDD3+ 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, connectivity, and security applications in industrial, automotive, and communications markets.
The MAX6715–MAX6729 family delivers ultra-low-voltage, multi-rail microprocessor supervision with factory-trimmed thresholds, integrated watchdog timers, and power-fail monitoring - targeting space-constrained, high-reliability embedded systems demanding deterministic reset behavior.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6729KAVDD3+?
The MAX6729KAVDD3+ has factory-trimmed reset thresholds of 4.625V (VTH1) for VCC1 and 3.075V (VTH2) for VCC2, with tolerances of ±125mV and ±75mV respectively. These values are encoded in the "VD" suffix per Maxim's Reset Voltage Threshold Suffix Guide and are verified across -40°C to +85°C. The MAX6729KAVDD3+ does not support adjustable thresholds for VCC1 or VCC2 - only RSTIN is externally configurable.
Does the MAX6729KAVDD3+ support watchdog functionality, and what are its timing parameters?
Yes, the MAX6729KAVDD3+ includes a dual-mode watchdog timer with a 35s minimum startup period after any reset event (power-up, MR, or watchdog timeout), followed by a 1.12s minimum normal timeout period. The watchdog triggers reset if WDI remains static beyond these intervals. WDI accepts TTL/CMOS logic levels, and the timer clears on any rising or falling edge - making it suitable for monitoring firmware execution flow in safety-critical applications.
How is the power-fail function implemented on the MAX6729KAVDD3+, and what is its response time?
The MAX6729KAVDD3+ implements power-fail detection via the PFI input, which compares against a 626.5mV internal reference. When PFI falls below this threshold, the push-pull PFO output asserts low within 2µs (typical propagation delay). PFO operates independently of the reset timeout - it deasserts immediately when PFI rises above threshold, enabling real-time power-good/power-fail interrupts without reset latency.
What package type and pin count does the MAX6729KAVDD3+ use, and is it RoHS-compliant?
The MAX6729KAVDD3+ uses an 8-pin SOT23-8 package (2.0mm × 2.1mm body, 0.65mm lead pitch) with lead-free (RoHS-compliant) construction. The "+" suffix in the part number explicitly denotes lead-free packaging per Maxim's ordering convention. This compact footprint supports high-density PCB layouts while accommodating all triple-supply supervision signals including dedicated PFI, PFO, RSTIN, and WDI.
Can the MAX6729KAVDD3+ monitor a negative supply voltage, and how is that achieved?
Yes, the MAX6729KAVDD3+ can monitor negative supplies using the PFI input with an external resistor divider configured per Figure 3b in the datasheet. When the negative rail is valid, PFO asserts low; as the rail collapses, PFO deasserts. Accuracy depends on PFI threshold tolerance (±15.5mV), resistor matching, and VCC stability. The MAX6729KAVDD3+ itself remains powered from positive VCC1/VCC2 - only the PFI network interfaces to the negative domain.
MAX6729KAVDD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 0.788V, 1.575V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- 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
MAX6729KAVDD3+ FAQ
1.How can I place an order for MAX6729KAVDD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6729KAVDD3+ 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 MAX6729KAVDD3+ reliable?
The price and inventory of MAX6729KAVDD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6729KAVDD3+ is usually 5 days.
3.What payment methods are accepted for MAX6729KAVDD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6729KAVDD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6729KAVDD3+?
MAX6729KAVDD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6729KAVDD3+ 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 MAX6729KAVDD3+?
For technical support, including MAX6729KAVDD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6729KAVDD3+ requirements.
6.How does Aetrix verify that MAX6729KAVDD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6729KAVDD3+ 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 MAX6729KAVDD3+ meets industry standards.
7.What is the process for return or replacement of MAX6729KAVDD3+?
All MAX6729KAVDD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6729KAVDD3+, 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 MAX6729KAVDD3+ part is unused and in its original packaging.
Return procedure for MAX6729KAVDD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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