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Analog Devices Inc./Maxim Integrated MAX6729AKASVD3+T
- Part No.:
- MAX6729AKASVD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6729AKASVD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6729AKASVD3+T from Maxim Integrated is a triple-supply ultra-low-voltage microprocessor supervisory circuit monitoring VCC1 (primary), VCC2 (secondary), and an externally adjustable RSTIN input down to 0.626V. It provides active-low push-pull reset output, power-fail detection with PFI/PFO, manual reset input, and watchdog timer with 35s startup/1.12s normal timeout. Designed for multivoltage telecom and industrial systems requiring guaranteed reset validity down to 0.8V.
For engineers reviewing the MAX6729AKASVD3+T datasheet, MAX6729AKASVD3+T pinout, MAX6729AKASVD3+T application, or MAX6729AKASVD3+T equivalent, this page delivers verified specifications, validated pin functions, confirmed dual/three-rail monitoring capability, real-world application contexts, and two technically documented alternative parts - all extracted from Maxim's official MAX6715A–MAX6729A/MAX6797A datasheet Rev 6 (July 2019).
Technical Context
The MAX6729AKASVD3+T integrates dual independent voltage comparators for VCC1 (1.8V–5.0V) and VCC2 (0.9V–3.3V), plus a high-impedance RSTIN comparator referenced to a 626.5mV internal bandgap. Its reset logic asserts RST low when any monitored rail falls below its factory-trimmed threshold (VTH1 = 4.625V typ, VTH2 = 3.075V typ) or when MR is pulled low, WDI times out, or PFI drops below threshold.
It features a dual-mode watchdog timer: 35s minimum startup period after reset, followed by 1.12s minimum normal timeout on WDI transitions. The device guarantees valid reset output state with either VCC1 or VCC2 ≥ 0.8V and supports push-pull RST/RST2/PFO outputs referenced to VCC1 or VCC2 respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V typical (suffix 'K' per Reset Voltage Threshold Suffix Guide) |
| VCC2 Reset Threshold | 3.075V typical (suffix 'A' per Reset Voltage Threshold Suffix Guide) |
| RSTIN Threshold | 626.5mV internal reference - enables monitoring of third supply as low as 0.62V via resistor divider |
| Reset Timeout Period | 140ms minimum (suffix 'D3' per Reset Timeout Period Suffix Guide) |
| Supply Current | 14µA typical at 3.6V - enables battery-operated system longevity |
| Operating Temperature | -40°C to +125°C - qualified for automotive and industrial ambient environments |
| Watchdog Timeout | 35s min startup / 1.12s min normal mode - accommodates boot sequences and runtime fault detection |
Pinout & Package
MAX6729AKASVD3+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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST/RST1 | Active-low push-pull reset output referenced to VCC1; asserted when VCC1/VCC2/RSTIN drop below thresholds, MR pulled low, or WDI timeout occurs |
| 2 | GND | System ground reference for all internal comparators and logic |
| 3 | MR | Active-low manual-reset input with internal 50kΩ pullup to VCC1; forces reset when pulled low and holds reset for full timeout after release |
| 4 | VCC2 | Secondary supply input powering VCC2 comparator and enabling RST2 output referenced to VCC2 |
| 5 | VCC1 | Primary supply input powering core logic, VCC1 comparator, and RST/RST1/PFO outputs |
| 6 | WDI | Watchdog input; reset triggered if signal remains static >35s (startup) or >1.12s (normal); unconnected disables watchdog |
| 7 | PFO | Active-low push-pull power-fail output referenced to VCC1; asserts immediately when PFI < 626.5mV, no timeout delay |
| 8 | PFI | Power-fail monitor input with 626.5mV internal reference; used to detect brownout on auxiliary supply via external resistor divider |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | VCC1 (1.8–5.0V) and VCC2 (0.9–3.3V) with factory-trimmed thresholds ensure precise rail supervision without external components |
| Externally adjustable third-rail monitor | RSTIN input with 626.5mV reference allows monitoring of auxiliary supplies down to 0.62V using high-impedance resistor dividers |
| Dual-mode watchdog timer | 35s startup window prevents false resets during boot; 1.12s runtime timeout ensures rapid processor fault detection |
| Guaranteed reset validity at low VCC | Reset output remains logic-valid with either VCC1 or VCC2 ≥ 0.8V - critical for brownout resilience in industrial systems |
| Integrated power-fail detection | PFI/PFO pair provides immediate, timeout-free power-fail alerting for orderly shutdown or backup activation |
Applications
| Telecom Power Management | Industrial PLC Controller |
|---|---|
Use Scenario: Monitoring primary 3.3V core, secondary 1.2V I/O, and auxiliary -12V bias supply in a carrier-grade line card. IC Role / Device Role / Timing Role: Triple-rail supervisor asserting RST on any rail undervoltage, generating PFO interrupt on -12V decay, and enabling watchdog-based firmware health check. Use Value: Prevents corrupted state during multi-rail sequencing faults; PFO-triggered software shutdown avoids data loss before main power collapse. |
Use Scenario: Supervising 24V DC input, 5V logic rail, and 3.3V microcontroller supply in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: VCC1 monitors 5V rail, VCC2 monitors 3.3V MCU supply, RSTIN monitors 24V input via divider; RST holds CPU in reset until all rails stabilize. Use Value: Ensures deterministic boot under wide-input industrial power conditions; 140ms timeout accommodates slow 24V filter charging. |
| Server Baseboard Management | Battery-Powered Edge Sensor Node |
Use Scenario: Coordinating reset sequencing across 12V, 5V, and 1.8V rails in a server baseboard management controller (BMC). IC Role / Device Role / Timing Role: VCC1=5V, VCC2=1.8V, RSTIN monitors 12V via divider; PFO signals early 12V droop to BMC for graceful service deactivation. Use Value: Enables predictive power-loss response; dual-comparator architecture eliminates need for three discrete supervisors, saving PCB area. |
Use Scenario: Long-life IoT sensor node powered by coin cell, requiring ultra-low quiescent current and reliable wake-from-reset behavior. IC Role / Device Role / Timing Role: Monitors 3.0V battery (VCC1), 1.8V LDO output (VCC2), and RTC backup rail (RSTIN); 14µA ICC1 extends battery life beyond 10 years. Use Value: Guarantees valid reset assertion even as battery decays to 0.8V; RSTIN monitoring prevents false wakeups from backup rail instability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6728AKASVD3+T | No watchdog timer; identical VCC1/VCC2 thresholds, RSTIN, PFI/PFO, and 140ms reset timeout | Suitable where firmware-level watchdog is handled externally or unnecessary | Select MAX6728AKASVD3+T when watchdog functionality is redundant or adds design complexity |
| MAX6729AUKASVD3+T | Same electrical specs but in 6-pin SOT23 (U6+1A) - lacks PFI/PFO pins; retains RST, GND, MR, VCC2, VCC1, WDI | Applicable where power-fail detection is omitted and board space is constrained | Choose MAX6729AUKASVD3+T only if PFI/PFO functionality is not required and footprint reduction is critical |
Compared with MAX6729AKASVD3+T, MAX6728AKASVD3+T removes watchdog capability while preserving all voltage monitoring and power-fail features, whereas MAX6729AUKASVD3+T sacrifices PFI/PFO to fit into a smaller 6-pin package - both require layout changes and functional trade-offs.
Availability
MAX6729AKASVD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control systems, and server management applications requiring stable component supply, extended temperature operation, and triple-rail supervision with integrated watchdog and power-fail detection.
Supply support for MAX6729AKASVD3+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 and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX6715A–MAX6729A/MAX6797A family delivers compact, ultra-low-voltage supervisory circuits optimized for multirail systems where reliability, small footprint, and guaranteed reset behavior down to 0.8V are essential.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on MAX6729AKASVD3+T?
The MAX6729AKASVD3+T has factory-trimmed reset thresholds: VCC1 = 4.625V typical (suffix 'K'), VCC2 = 3.075V typical (suffix 'A'), per Maxim's Reset Voltage Threshold Suffix Guide. These values are guaranteed over -40°C to +125°C and include ±1.5% tolerance at 25°C, with 20ppm/°C tempco.
Does MAX6729AKASVD3+T support monitoring a negative supply voltage?
Yes - MAX6729AKASVD3+T can monitor negative supplies using the PFI input with an appropriate resistor divider, as shown in Figure 3 of the datasheet. When the negative supply drops, PFI falls below 626.5mV and PFO asserts low, enabling interrupt-driven shutdown or backup activation.
What is the function of the WDI pin on MAX6729AKASVD3+T, and how is it disabled?
The WDI pin on MAX6729AKASVD3+T enables the dual-mode watchdog timer. It is disabled by leaving the pin unconnected - the internal 200nA current source detects the open state. Connecting WDI to any node sourcing >50nA may prevent proper disable behavior.
How does the reset timeout period of 140ms (D3 suffix) affect system boot timing for MAX6729AKASVD3+T?
The 140ms minimum reset timeout (D3 suffix) ensures MAX6729AKASVD3+T holds the microprocessor in reset long enough for all power rails - including slow-charging bulk capacitors and LDOs - to stabilize fully before release. This prevents premature execution during marginal power conditions.
Can MAX6729AKASVD3+T generate a reset if only VCC2 is present and VCC1 is absent?
Yes - MAX6729AKASVD3+T guarantees valid reset output logic state when either VCC1 or VCC2 remains greater than 0.8V. If only VCC2 is powered and exceeds 0.8V, the device operates normally and asserts RST if VCC2 falls below its 3.075V threshold or if MR is activated.
MAX6729AKASVD3+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:
- 1.575V, 2.925V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6729AKASVD3+T FAQ
1.How can I place an order for MAX6729AKASVD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6729AKASVD3+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 MAX6729AKASVD3+T reliable?
The price and inventory of MAX6729AKASVD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6729AKASVD3+T is usually 5 days.
3.What payment methods are accepted for MAX6729AKASVD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6729AKASVD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6729AKASVD3+T?
MAX6729AKASVD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6729AKASVD3+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 MAX6729AKASVD3+T?
For technical support, including MAX6729AKASVD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6729AKASVD3+T requirements.
6.How does Aetrix verify that MAX6729AKASVD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6729AKASVD3+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 MAX6729AKASVD3+T meets industry standards.
7.What is the process for return or replacement of MAX6729AKASVD3+T?
All MAX6729AKASVD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6729AKASVD3+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 MAX6729AKASVD3+T part is unused and in its original packaging.
Return procedure for MAX6729AKASVD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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