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Analog Devices Inc./Maxim Integrated MAX6729KASVD3+
- Part No.:
- MAX6729KASVD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6729KASVD3+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:670
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Product details
Overview
MAX6729KASVD3+ 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 (PFI/PFO), manual reset input (MR), and watchdog timer with 35s startup / 1.12s normal timeout. It ensures reliable system boot and brownout protection in multivoltage embedded systems.
For engineers reviewing the MAX6729KASVD3+ datasheet, MAX6729KASVD3+ pinout, MAX6729KASVD3+ application, or MAX6729KASVD3+ equivalent, key selection criteria include its guaranteed reset validity down to VCC1/VCC2 = 0.8V, 14µA typical supply current at 3.6V, 20µs VCC-to-reset delay, and support for externally adjustable third-supply monitoring with 0.626V internal reference.
Technical Context
The MAX6729KASVD3+ integrates three independent voltage monitors: primary (VCC1), secondary (VCC2), and auxiliary (RSTIN), each with factory-trimmed or resistor-divider–configured thresholds. Its dual-mode watchdog timer delivers a 35s minimum startup period followed by a 1.12s minimum normal timeout, enabling robust firmware execution monitoring after power-up or reset events.
This device implements push-pull reset output referenced to VCC1, open-drain PFO referenced to VCC1, and logic-compatible MR/WDI inputs with internal 50kΩ pullup on MR. All reset assertions - from supply undervoltage, manual reset, or watchdog timeout - trigger a fixed 210ms (min) reset timeout period, confirmed by D3 suffix per Reset Timeout Period Suffix Guide.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (typ), factory-trimmed; ensures reliable reset assertion when primary supply drops below nominal 4.63V rail |
| VCC2 Threshold | 3.075V (typ), factory-trimmed; monitors secondary 3.3V domain with ±0.075V tolerance over temperature |
| RSTIN Reference | 626.5mV (typ); enables precise external monitoring of third supply (e.g., 1.2V core) using resistor divider |
| Reset Timeout | 210ms (min); guarantees µP reset hold time sufficient for full initialization of complex SoCs and peripherals |
| Supply Current | 14µA (typ) at 3.6V; minimizes quiescent load on battery-backed or low-power rails |
| Operating Temp | -40°C to +85°C; qualified for industrial-grade embedded equipment without derating |
| Reset Output Type | Push-pull active-low RST; eliminates need for external pullup and drives directly into µP reset pin |
Pinout & Package
MAX6729KASVD3+ is housed in an 8-pin SOT23-8 package (3.0mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts while supporting thermal dissipation up to 714mW at +70°C.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts low during any fault condition and holds for 210ms min |
| 2 | GND | Analog/digital ground reference; must be connected to system ground plane for stable threshold operation |
| 3 | MR | Active-low manual reset input with internal 50kΩ pullup to VCC1; debounced by design, no external RC needed |
| 4 | PFO | Active-low power-fail output (push-pull); asserts low when PFI < 626.5mV, deasserts immediately without timeout |
| 5 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal circuitry and sets VCC2 monitor reference |
| 6 | VCC1 | Primary supply input (1.8V–5.0V range); powers device core and defines RST output voltage level |
| 7 | PFI | Power-fail comparator input; high-impedance node (±25nA) for resistor-divider–based monitoring of auxiliary rail |
| 8 | WDI | Watchdog input; detects µP activity via rising/falling edges; triggers reset if idle > 1.12s (normal mode) |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode watchdog timer | 35s startup + 1.12s normal timeout prevents false resets during boot while ensuring rapid fault detection in runtime |
| Guaranteed reset validity | Operates correctly with VCC1 or VCC2 ≥ 0.8V - critical for brownout recovery in low-voltage systems |
| Immunity to VCC transients | Withstands negative-going glitches ≤20µs at 100mV overdrive - eliminates spurious resets from switching noise |
| Low-power supervision | 14µA typical ICC at 3.6V enables multi-year battery life in always-on IoT edge nodes |
| Flexible third-supply monitoring | RSTIN input with 626.5mV reference supports monitoring of sub-1V rails (e.g., 0.8V FPGA core) via precision divider |
Applications
| Industrial PLC Controller | Network Router Power Management |
|---|---|
|
Use Scenario: Monitors 5V main, 3.3V I/O, and 1.2V CPU core rails in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting synchronized reset across all domains upon any rail collapse; PFO signals early power-fail to initiate safe state shutdown. Use Value: Prevents corrupted ladder logic execution and EEPROM writes during brownout, meeting IEC 61131-2 immunity requirements. |
Use Scenario: Ensures clean boot and runtime supervision of dual 12V/5V DC-DC outputs and 1.8V PHY supply in carrier-class Ethernet routers. IC Role / Device Role / Timing Role: Uses WDI to verify Linux kernel heartbeat; PFI monitors backup battery voltage to preemptively switch to UPS before outage. Use Value: Eliminates unexplained reboots caused by transient supply dips on PoE-powered line cards. |
| Medical Patient Monitor | Automotive ADAS Camera Module |
|
Use Scenario: Supervises isolated 3.3V analog front-end, 1.8V digital signal processor, and 5V display backlight in portable ECG units. IC Role / Device Role / Timing Role: MR input enables clinician-initiated hard reset; RSTIN monitors Li-ion battery voltage to trigger low-battery alert before shutdown. Use Value: Meets FDA Class II requirement for deterministic reset behavior under battery sag conditions. |
Use Scenario: Validates 5V camera sensor, 3.3V image processor, and 1.2V DDR memory rails in automotive surround-view systems. IC Role / Device Role / Timing Role: Push-pull RST drives automotive-grade µP reset pin directly; watchdog monitors firmware loop integrity during CAN-based diagnostics. Use Value: Complies with ISO 26262 ASIL-B requirements for fail-safe power sequencing and fault detection latency. |
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 | Same pinout and feature set, but PFO is open-drain instead of push-pull; requires external pullup | Suitable where PFO must interface with mixed-voltage logic (e.g., 1.8V I²C interrupt line) | Select MAX6728KA+T only if open-drain PFO is required for level-shifting or wired-OR configurations |
| TPS3808G33DBVR | Dual-supply monitor only (no RSTIN/PFI/WDI); 3.3V fixed VDD threshold; 200ms timeout; SOT23-6 package | Lacks third-supply monitoring and watchdog - insufficient for systems requiring auxiliary rail or firmware health checks | Choose TPS3808G33DBVR only for cost-sensitive dual-rail applications without PFI/WDI needs |
Compared with MAX6729KASVD3+, MAX6728KA+T offers identical supervision capability but less drive strength on PFO, while TPS3808G33DBVR reduces functionality and pin count - making MAX6729KASVD3+ the only option supporting full triple-voltage, watchdog, and push-pull PFO in one 8-pin package.
Availability
MAX6729KASVD3+ is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, and medical patient monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6729KASVD3+ 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, communications, and computing applications.
The MAX6715–MAX6729 family delivers ultra-low-voltage, multirail supervision with integrated watchdog and power-fail functions - engineered specifically for reliability-critical embedded systems where supply sequencing and fault detection must operate down to 0.8V.
FAQ
What is the exact reset timeout period for MAX6729KASVD3+?
The MAX6729KASVD3+ has a minimum reset timeout period of 210ms, as indicated by the "D3" suffix in its part number per Maxim's Reset Timeout Period Suffix Guide. This value is guaranteed over the full -40°C to +85°C operating temperature range and ensures sufficient hold time for complex microprocessors to complete initialization sequences before releasing reset.
Does MAX6729KASVD3+ support monitoring a 1.0V supply rail?
Yes, MAX6729KASVD3+ supports monitoring a 1.0V rail via its RSTIN input using an external resistor divider. With a 626.5mV internal reference, a simple two-resistor network (e.g., R1 = 600kΩ, R2 = 1MΩ) scales the 1.0V rail to meet the RSTIN threshold, enabling precise undervoltage detection without additional components.
How does the watchdog timer behave after power-up in MAX6729KASVD3+?
After power-up or any reset event, MAX6729KASVD3+ enters a 35s minimum startup watchdog 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 - preventing premature resets during lengthy bootloader execution.
Can MAX6729KASVD3+ generate a power-fail interrupt without asserting system reset?
Yes, MAX6729KASVD3+ provides independent PFI/PFO functionality: when PFI falls below 626.5mV, PFO asserts low immediately without triggering RST or invoking the 210ms reset timeout. This allows software to execute graceful shutdown routines before system reset occurs.
What is the maximum supply voltage the MAX6729KASVD3+ can tolerate on VCC1 and VCC2 pins?
MAX6729KASVD3+ supports absolute maximum voltages of +6V on both VCC1 and VCC2 pins, per its Absolute Maximum Ratings table. However, functional operation is specified only from 0.8V to 5.5V - exceeding 5.5V risks latch-up or permanent damage despite surviving brief transients up to +6V.
MAX6729KASVD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.575V, 2.925V, 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
MAX6729KASVD3+ FAQ
1.How can I place an order for MAX6729KASVD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6729KASVD3+ 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 MAX6729KASVD3+ reliable?
The price and inventory of MAX6729KASVD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6729KASVD3+ is usually 5 days.
3.What payment methods are accepted for MAX6729KASVD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6729KASVD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6729KASVD3+?
MAX6729KASVD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6729KASVD3+ 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 MAX6729KASVD3+?
For technical support, including MAX6729KASVD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6729KASVD3+ requirements.
6.How does Aetrix verify that MAX6729KASVD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6729KASVD3+ 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 MAX6729KASVD3+ meets industry standards.
7.What is the process for return or replacement of MAX6729KASVD3+?
All MAX6729KASVD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6729KASVD3+, 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 MAX6729KASVD3+ part is unused and in its original packaging.
Return procedure for MAX6729KASVD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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