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Analog Devices Inc./Maxim Integrated MAX6729AKAVDD3+T
- Part No.:
- MAX6729AKAVDD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6729AKAVDD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6729AKAVDD3+T from Maxim Integrated is a dual-supply ultra-low-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (primary) and VCC2 (secondary) supplies with factory-trimmed reset thresholds of 4.625V (VTH1) and 3.075V (VTH2), respectively, and featuring push-pull RST and PFO outputs, manual-reset input (MR), power-fail input/output (PFI/PFO), and watchdog timer (WDI) - deployed in telecom power systems requiring reliable brownout detection and orderly shutdown.
For engineers reviewing the MAX6729AKAVDD3+T datasheet, MAX6729AKAVDD3+T pinout, MAX6729AKAVDD3+T application, or MAX6729AKAVDD3+T equivalent, key selection criteria include guaranteed reset validity down to VCC1/VCC2 = 0.8V, 1.12s normal watchdog timeout, 2.2ms minimum reset timeout (D1 suffix), 14µA typical supply current at 3.6V, and AEC-Q100-qualified operation across –40°C to +125°C.
Technical Context
The MAX6729AKAVDD3+T integrates dual independent voltage comparators with hysteresis (0.5% of threshold), a programmable reset timeout timer (D1 = 1.1–2.2ms min), and a dual-mode watchdog (35s startup / 1.12s normal mode) triggered by WDI edge transitions. Its internal 0.626V reference enables precise external threshold setting via resistor dividers on RSTIN or PFI.
It supports active-low push-pull RST and PFO outputs referenced to VCC1, MR with 50kΩ internal pullup to VCC1, and operates with full functionality even when either VCC1 or VCC2 remains ≥0.8V - enabling robust supervision in asymmetric multivoltage domains such as 4.5V/3.3V server rails or 3.3V/1.8V FPGA core/I/O supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (typ), factory-trimmed for 4.5–4.75V range - ensures reliable reset assertion during 4.5V rail brownout without false triggering |
| VCC2 Reset Threshold | 3.075V (typ), factory-trimmed for 3.0–3.15V range - matches standard 3.3V supply tolerance for accurate secondary rail monitoring |
| Reset Timeout Period | 1.1–2.2ms (min), D1 suffix - provides sufficient hold time for µP initialization while minimizing system boot delay |
| Watchdog Timeout | 1.12s (min) normal mode; 35s (min) startup mode - accommodates long firmware boot sequences then enforces tight runtime fault detection |
| Supply Current | 14µA (typ) at 3.6V - enables use in always-on battery-backed subsystems without significant quiescent drain |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial control, and telecom base station environments |
| Reset Output Type | Push-pull active-low RST and PFO - eliminates need for external pullup resistors and ensures fast, rail-referenced logic levels |
Pinout & Package
MAX6729AKAVDD3+T is housed in an 8-pin SOT23 package (package code K8SN+1, outline 21-0078), with thermal resistance θJA = 180°C/W on multilayer board - suitable for high-density PCB layouts with constrained thermal budgets.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1 - asserts low on VCC1/VCC2 undervoltage, MR low, or WDI timeout; holds for full reset timeout period |
| 2 | GND | System ground reference - common return path for all internal comparators, timers, and output drivers |
| 3 | MR | Active-low manual-reset input with 50kΩ internal pullup to VCC1 - debounced by design; pulse ≥1µs forces reset regardless of supply status |
| 4 | VCC2 | Secondary supply input - powers internal circuitry when > VCC1 and sets reference for VCC2 comparator (3.075V threshold) |
| 5 | VCC1 | Primary supply input - powers device when > VCC2 and sets reference for VCC1 comparator (4.625V threshold) |
| 6 | PFI | Power-fail input with 0.626V internal reference - monitors auxiliary supply (e.g., battery or preregulator) via external resistor divider |
| 7 | PFO | Active-low push-pull power-fail output referenced to VCC1 - asserts immediately (2µs delay) when PFI < 0.626V, no timeout applied |
| 8 | WDI | Watchdog input - detects rising/falling edges; unconnected state disables watchdog via 200nA current-source detector |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage supervision | Simultaneous monitoring of VCC1 (4.625V) and VCC2 (3.075V) with separate comparators and hysteresis - prevents single-point failure in multirail systems |
| Guaranteed reset validity down to 0.8V | Ensures correct RST/PFO logic states even during deep brownout conditions where VCC1 or VCC2 drops to 0.8V - critical for fail-safe shutdown sequencing |
| Integrated power-fail comparator with PFO | Enables early warning of supply collapse (e.g., battery depletion) with sub-3µs response and no reset timeout - allows software-controlled graceful shutdown |
| Manual-reset with internal pullup | 50kΩ internal MR pullup to VCC1 eliminates external component count and ensures defined reset state when switch is open or unconnected |
| Immunity to short VCC transients | Withstands negative-going glitches ≤20µs (at 100mV overdrive) without spurious reset - reduces need for excessive input filtering in noisy environments |
Applications
| Telecom Power Management | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring redundant 48V DC-DC converter outputs and 3.3V/1.8V FPGA I/O/core rails in carrier-grade access equipment. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting RST on primary or secondary rail undervoltage, while PFO signals impending power loss to trigger firmware save routines. Use Value: Prevents data corruption during AC mains interruption by initiating controlled reboot within 2.2ms of rail collapse, leveraging guaranteed 0.8V reset validity. |
Use Scenario: Supervising isolated 24V field bus supply and 5V logic rail in modular programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Provides MR-initiated reset for field technician recovery and watchdog-monitored firmware execution, with PFO tied to safety controller interrupt line. Use Value: Enables deterministic fault response: 1.12s watchdog timeout catches hung ladder logic, while 35s startup window accommodates cold-boot sequence before runtime monitoring begins. |
| Automotive Infotainment Head Units | Network Equipment Line Cards |
Use Scenario: Validating 5V main supply and 3.3V SoC interface rail in AEC-Q100-compliant infotainment systems exposed to load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: Acts as primary reset source for application processor and GPU, with RST asserted on VCC1 drop below 4.625V or VCC2 drop below 3.075V. Use Value: Guarantees functional reset behavior down to 0.8V - essential for maintaining safe state during battery voltage sag to 6V during engine cranking. |
Use Scenario: Ensuring reliable boot and runtime integrity of multi-core packet processors on high-speed line cards powered by distributed 12V/3.3V/1.2V rails. IC Role / Device Role / Timing Role: Monitors primary 3.3V rail and auxiliary 1.2V core supply; uses WDI to verify firmware health and PFO to flag upstream PSU degradation. Use Value: Combines 14µA quiescent current with –40°C to +125°C operation to support always-on diagnostics without thermal derating in confined chassis spaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6728AKAVDD3+T | Identical pinout and electrical specs, but lacks watchdog timer (no WDI pin/function) | Suitable only for systems requiring dual-supply monitoring without runtime firmware supervision | Select when watchdog capability is unnecessary and BOM cost reduction is prioritized |
| TPS3808G33DBVR | Single-supply supervisor (monitors only VCC), 3.3V fixed threshold, 200ms reset timeout, no PFI/PFO or WDI | Limited to basic 3.3V rail monitoring; no auxiliary voltage or power-fail alerting capability | Choose only for simple single-rail applications where dual/three-rail supervision is not required |
Compared with MAX6728AKAVDD3+T and TPS3808G33DBVR, the MAX6729AKAVDD3+T uniquely delivers integrated dual-rail supervision, power-fail alerting, and dual-mode watchdog in one 8-pin SOT23 - eliminating discrete components and reducing PCB area by >40% versus multi-IC solutions.
Availability
MAX6729AKAVDD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and automotive electronics requiring stable component supply, extended temperature operation, and AEC-Q100-compliant reliability.
Supply support for MAX6729AKAVDD3+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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX6715A–MAX6729A family delivers ultra-low-voltage, multirail μP supervisory circuits optimized for space-constrained, high-reliability systems requiring simultaneous monitoring of primary, secondary, and auxiliary supplies - with emphasis on guaranteed operation down to 0.8V and robust noise immunity.
FAQ
What is the reset threshold voltage for VCC1 on the MAX6729AKAVDD3+T?
The MAX6729AKAVDD3+T has a factory-trimmed VCC1 reset threshold of 4.625V (typical), with a specified range of 4.500V to 4.750V at 25°C. This threshold is guaranteed over the full –40°C to +125°C operating temperature range with a tempco of 20ppm/°C, making it suitable for stable 4.5V rail supervision in telecom and industrial applications where precise brownout detection is critical. The MAX6729AKAVDD3+T uses this threshold to assert RST when VCC1 falls below the trip point.
Does the MAX6729AKAVDD3+T support both push-pull and open-drain reset outputs?
The MAX6729AKAVDD3+T features push-pull active-low RST and PFO outputs referenced to VCC1 - no external pullup resistors required. It does not support open-drain configuration; that option is available only on select variants like MAX6728A (same pinout but different output driver). The push-pull architecture ensures fast, rail-defined logic levels and simplifies interface to µPs with unidirectional reset inputs. This design choice is integral to the MAX6729AKAVDD3+T's low-component-count implementation.
How does the watchdog timer function on the MAX6729AKAVDD3+T?
The MAX6729AKAVDD3+T implements a dual-mode watchdog timer: a 35s (min) startup period after any reset event, followed by a 1.12s (min) normal timeout period triggered by the first valid WDI edge transition. If WDI remains static beyond the active timeout, RST asserts for the programmed reset period (1.1–2.2ms). WDI is disabled when left floating, detected by a 200nA internal current source. This behavior is fully specified and tested for the MAX6729AKAVDD3+T across temperature and voltage.
Can the MAX6729AKAVDD3+T monitor a third voltage supply?
No - the MAX6729AKAVDD3+T is a dual-supply supervisor (VCC1 and VCC2 only) and does not include the RSTIN input required for adjustable third-voltage monitoring. That feature is present in MAX6723A–MAX6727A variants. However, the MAX6729AKAVDD3+T does provide PFI/PFO for auxiliary supply monitoring down to 0.626V using an external resistor divider, enabling power-fail detection on a third rail without adding a separate comparator IC.
What is the operating temperature range and qualification status of the MAX6729AKAVDD3+T?
The MAX6729AKAVDD3+T is rated for continuous operation from –40°C to +125°C and is AEC-Q100 qualified (Grade 0), meeting automotive reliability standards for stress testing, ESD, and latch-up. This qualification applies specifically to the MAX6729AKAVDD3+T variant and confirms its suitability for under-hood and industrial control applications where thermal stability and long-term reliability are mandatory. The MAX6729AKAVDD3+T maintains full electrical specifications across this full range.
MAX6729AKAVDD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- 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 ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6729AKAVDD3+T FAQ
1.How can I place an order for MAX6729AKAVDD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6729AKAVDD3+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 MAX6729AKAVDD3+T reliable?
The price and inventory of MAX6729AKAVDD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6729AKAVDD3+T is usually 5 days.
3.What payment methods are accepted for MAX6729AKAVDD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6729AKAVDD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6729AKAVDD3+T?
MAX6729AKAVDD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6729AKAVDD3+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 MAX6729AKAVDD3+T?
For technical support, including MAX6729AKAVDD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6729AKAVDD3+T requirements.
6.How does Aetrix verify that MAX6729AKAVDD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6729AKAVDD3+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 MAX6729AKAVDD3+T meets industry standards.
7.What is the process for return or replacement of MAX6729AKAVDD3+T?
All MAX6729AKAVDD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6729AKAVDD3+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 MAX6729AKAVDD3+T part is unused and in its original packaging.
Return procedure for MAX6729AKAVDD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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