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Analog Devices Inc./Maxim Integrated MAX6729AKASYD3+
- Part No.:
- MAX6729AKASYD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6729AKASYD3+.pdf
- Description:
- MAX6729 TRIPLE, ULTRA-LOW-VOLTAG
- Quantity:
- Payment:
- Shipping:
Inventory:1,467
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Product details
Overview
The MAX6729AKASYD3+ from Maxim Integrated is a dual-voltage, ultra-low-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (4.625V threshold) and VCC2 (3.075V threshold) with 210ms reset timeout, push-pull active-low RST and PFO outputs, power-fail input (PFI), and watchdog timer - used for reliable power sequencing and fault detection in telecom and industrial embedded systems.
For engineers reviewing the MAX6729AKASYD3+ datasheet, MAX6729AKASYD3+ pinout, MAX6729AKASYD3+ application, or MAX6729AKASYD3+ equivalent, key selection criteria include its guaranteed reset validity down to VCC1/VCC2 = 0.8V, 14µA typical supply current at 3.6V, 626.5mV internal reference for PFI/RSTIN, 35s min watchdog startup period, and immunity to sub-20µs VCC transients.
Technical Context
The MAX6729AKASYD3+ integrates dual independent voltage monitors (VCC1 = 4.625V, VCC2 = 3.075V), a power-fail comparator referenced to 626.5mV, and a dual-mode watchdog timer with 35s minimum startup delay and 1.12s minimum normal timeout. It asserts active-low reset (RST) and power-fail (PFO) outputs simultaneously when either supply drops below threshold or PFI falls below 626.5mV.
Its push-pull RST and PFO outputs are referenced to VCC1, while RST2 is absent - confirming it is a dual-supply (not triple) variant with PFI/PFO functionality enabled. The device operates across –40°C to +125°C and maintains valid reset logic state as long as VCC1 or VCC2 remains ≥0.8V, enabling brownout-safe operation in battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, falling edge; ensures reliable reset assertion during 5V rail collapse) |
| VCC2 Threshold | 3.075V (factory-trimmed, falling edge; matches common 3.3V I/O supply tolerance) |
| Reset Timeout | 210ms (minimum; provides sufficient hold time for µP initialization after power recovery) |
| Supply Current | 14µA typical at 3.6V (enables use in always-on, low-power monitoring circuits) |
| PFI Threshold | 626.5mV (internal reference; allows precise external resistor-divider setup for auxiliary supply monitoring) |
| Watchdog Startup | 35s minimum (prevents false timeout during cold boot or firmware load sequences) |
| Operating Temp | –40°C to +125°C (supports under-hood automotive, industrial control, and telecom base station deployment) |
Pinout & Package
MAX6729AKASYD3+ uses an 8-pin SOT23 package (3.0mm × 1.7mm × 1.3mm height), optimized for space-constrained PCB layouts in portable and modular equipment. Pin functions are validated per Maxim's official pin description table for MAX6728A/MAX6729A/MAX6797A variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts when VCC1/VCC2/PFI drop below thresholds or MR pulled low |
| 2 | GND | Ground reference for all internal comparators and outputs; must be low-impedance connection |
| 3 | MR | Active-low manual-reset input with 50kΩ internal pullup to VCC1; debounced by 100ns glitch rejection |
| 4 | PFO | Active-low push-pull power-fail output referenced to VCC1; asserts independently of reset timeout (no delay) |
| 5 | VCC2 | Secondary supply input (monitored at 3.075V); powers internal VCC2 comparator and enables RST2 if present (not used here) |
| 6 | VCC1 | Primary supply input (monitored at 4.625V); powers core logic, RST, PFO, and MR pullup |
| 7 | PFI | Power-fail input with 626.5mV internal reference; high-impedance node for external resistor-divider monitoring of third supply |
| 8 | NC | No-connect pin; left floating per datasheet - not internally bonded or functional |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of primary (4.625V) and secondary (3.075V) rails with separate thresholds and hysteresis |
| Integrated power-fail comparator | 626.5mV reference enables early warning shutdown before critical brownout via PFI/PFO pair |
| Dual-mode watchdog timer | 35s startup + 1.12s normal timeout prevents false resets during boot while ensuring runtime fault detection |
| Guaranteed reset validity to 0.8V | Ensures deterministic reset behavior during deep brownout conditions where VCC drops near cutoff |
| Low 14µA supply current | Minimizes quiescent power draw in battery-backed or energy-harvesting applications |
Applications
| Telecom Power Management | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring 48V DC-DC converter output (5V) and isolated 3.3V I/O rail in remote radio units. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting coordinated RST and PFO to halt processor and trigger graceful shutdown before backup capacitor depletion. Use Value: Prevents data corruption during AC mains interruption by initiating controlled firmware save within 210ms window. |
Use Scenario: Supervising main 24V supply and field-side 5V sensor bus in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Detecting undervoltage on both rails and generating immediate PFO interrupt for diagnostics, plus delayed RST for full system reset. Use Value: Enables fail-safe response to partial supply failure without requiring external logic or additional supervisors. |
| Automotive Infotainment Head Units | Medical Portable Monitors |
Use Scenario: Validating 5V MCU core supply and 3.3V display interface rail in temperature-cycled cabin environments. IC Role / Device Role / Timing Role: Providing –40°C to +125°C guaranteed reset assertion and watchdog supervision during cold cranking events. Use Value: Eliminates need for discrete RC reset circuits and improves cold-start reliability per ISO 16750-2 pulse 4 requirements. |
Use Scenario: Ensuring safe power-up sequence and brownout recovery in battery-powered ECG/SpO₂ devices. IC Role / Device Role / Timing Role: Using PFI to monitor battery voltage decay and trigger low-battery alert (PFO) before RST asserts at critical 3.075V threshold. Use Value: Extends usable battery life by enabling firmware-initiated shutdown at 3.2V instead of waiting for hard reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6728AKASYD3+ | No watchdog timer; identical pinout, thresholds, and PFI/PFO functionality | Suitable only where watchdog supervision is unnecessary; lower BOM cost | Select when system-level watchdog is handled externally or omitted entirely |
| TPS3808G33DBVR | Single-supply (3.3V only), no PFI input, 200ms timeout, 2.5µA supply current | Lacks dual-rail monitoring and power-fail warning capability | Use only for simpler 3.3V-only systems where auxiliary supply monitoring is not required |
Compared with MAX6728AKASYD3+, the MAX6729AKASYD3+ adds watchdog supervision without changing footprint or supply monitoring behavior; versus TPS3808G33DBVR, it delivers true dual-rail supervision with PFI-triggered early warning - critical for systems with multiple independent power domains.
Availability
MAX6729AKASYD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and automotive infotainment systems requiring stable component supply, extended temperature operation, and integrated power-fail signaling.
Supply support for MAX6729AKASYD3+ 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 management, sensing, and connectivity in demanding industrial and automotive environments.
The MAX6715A–MAX6729A family delivers ultra-low-voltage, multi-rail supervisory circuits targeting space-constrained, high-reliability embedded systems needing guaranteed reset behavior down to 0.8V and integrated watchdog/power-fail features.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6729AKASYD3+?
The MAX6729AKASYD3+ has factory-trimmed reset thresholds of 4.625V for VCC1 (primary supply) and 3.075V for VCC2 (secondary supply), as indicated by the "KA" suffix per Maxim's Reset Voltage Threshold Suffix Guide. These values are specified over –40°C to +125°C with ±1.5% tolerance and 20ppm/°C tempco.
Does the MAX6729AKASYD3+ support triple-voltage monitoring?
No, the MAX6729AKASYD3+ does not support triple-voltage monitoring. It is a dual-supply supervisor with dedicated VCC1 and VCC2 inputs. While it includes PFI for auxiliary monitoring, the RSTIN pin is not implemented in this variant - confirmed by pin 8 being NC and absence of RSTIN function in the MAX6728A/MAX6729A/MAX6797A pin mapping.
What is the watchdog timeout behavior of the MAX6729AKASYD3+?
The MAX6729AKASYD3+ features a dual-mode watchdog: 35s minimum startup timeout after any reset event, followed by 1.12s minimum normal timeout after the first WDI transition. This prevents false timeouts during boot while ensuring rapid fault detection during steady-state operation - a key differentiator from single-mode watchdog supervisors like the MAX6728AKASYD3+.
Can the MAX6729AKASYD3+ operate with VCC1 below 1.0V?
Yes, the MAX6729AKASYD3+ guarantees valid reset output logic state as long as either VCC1 or VCC2 remains ≥0.8V. Its internal circuitry remains functional down to this level, enabling robust brownout detection in battery-depleted scenarios - unlike many supervisors that require ≥1.2V for reset assertion integrity.
What package type and dimensions does the MAX6729AKASYD3+ use?
The MAX6729AKASYD3+ uses an 8-pin SOT23 package measuring 3.0mm × 1.7mm × 1.3mm (height), with standard lead pitch of 0.65mm. This compact outline supports high-density PCB layouts in space-constrained applications such as small-form-factor telecom modules and portable medical devices.
MAX6729AKASYD3+ 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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.188V, 2.925V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6729AKASYD3+ FAQ
1.How can I place an order for MAX6729AKASYD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6729AKASYD3+ 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 MAX6729AKASYD3+ reliable?
The price and inventory of MAX6729AKASYD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6729AKASYD3+ is usually 5 days.
3.What payment methods are accepted for MAX6729AKASYD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6729AKASYD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6729AKASYD3+?
MAX6729AKASYD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6729AKASYD3+ 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 MAX6729AKASYD3+?
For technical support, including MAX6729AKASYD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6729AKASYD3+ requirements.
6.How does Aetrix verify that MAX6729AKASYD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6729AKASYD3+ 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 MAX6729AKASYD3+ meets industry standards.
7.What is the process for return or replacement of MAX6729AKASYD3+?
All MAX6729AKASYD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6729AKASYD3+, 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 MAX6729AKASYD3+ part is unused and in its original packaging.
Return procedure for MAX6729AKASYD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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