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Analog Devices Inc./Maxim Integrated MAX6729KASYD3+
- Part No.:
- MAX6729KASYD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6729KASYD3+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6729KASYD3+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (primary), VCC2 (secondary), and RSTIN (adjustable third supply) with factory-trimmed thresholds of 4.625V and 3.075V, 210ms reset timeout, push-pull active-low RST output, and integrated power-fail comparator with PFI/PFO. It ensures reliable system reset during brownouts in battery-powered telecom and industrial controllers.
For engineers reviewing the MAX6729KASYD3+ datasheet, MAX6729KASYD3+ pinout, MAX6729KASYD3+ application, or MAX6729KASYD3+ equivalent, key selection criteria include its triple-supply monitoring capability, guaranteed reset validity down to VCC1/VCC2 = 0.8V, push-pull RST output referenced to VCC1, 14µA typical supply current at 3.6V, and support for power-fail warning via PFI/PFO interface.
Technical Context
The MAX6729KASYD3+ integrates three independent voltage monitors: VCC1 (4.625V threshold), VCC2 (3.075V threshold), and RSTIN (626.5mV internal reference, adjustable via external divider). Reset assertion occurs if any monitored voltage falls below its threshold, with a guaranteed minimum 210ms timeout after recovery.
It features a push-pull RST output referenced to VCC1, open-drain PFO referenced to VCC1, manual reset input (MR) with 50kΩ internal pullup, and power-fail comparator with 2µs propagation delay from PFI to PFO. The device operates across -40°C to +85°C and draws only 14µA typical supply current at 3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±125mV tolerance); ensures precise reset initiation for 5V or 4.8V primary rails |
| VCC2 Threshold | 3.075V (factory-trimmed, ±75mV tolerance); supports reliable monitoring of 3.3V I/O or auxiliary supplies |
| RSTIN Reference | 626.5mV (internal bandgap); enables accurate third-supply monitoring down to 0.62V via resistor divider |
| Reset Timeout | 210ms (minimum); provides sufficient hold time for processor initialization and peripheral stabilization |
| Supply Current | 14µA typical at 3.6V; minimizes quiescent power draw in always-on battery-backed systems |
| Operating Temp | -40°C to +85°C; qualified for industrial and extended-temperature embedded applications |
| Reset Output Type | Push-pull active-low RST; eliminates need for external pullup and ensures defined logic level during VCC ramp |
Pinout & Package
MAX6729KASYD3+ uses an 8-pin SOT23-8 package (2.0mm × 2.1mm footprint, 1.1mm height), optimized for space-constrained PCB layouts in portable and industrial equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts low on fault and holds for 210ms timeout |
| 2 | GND | Analog/digital ground reference; must be connected to system common ground plane |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; initiates reset when pulled low |
| 4 | PFO | Active-low power-fail output (push-pull); asserts low when PFI < 626.5mV, no timeout delay |
| 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 core logic and defines RST output voltage level |
| 7 | PFI | Power-fail input; high-impedance node for resistor-divider network to set custom power-fail threshold |
| 8 | RSTIN | Adjustable reset input; monitors third supply via external divider against 626.5mV internal reference |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring | Simultaneous VCC1 (4.625V), VCC2 (3.075V), and RSTIN (626.5mV ref) supervision eliminates need for multiple discrete supervisors |
| Guaranteed reset validity | Outputs remain functional and valid even when VCC1 or VCC2 drops to 0.8V - critical for brownout detection before full rail collapse |
| Integrated power-fail comparator | PFI/PFO pair provides early warning of supply degradation without requiring external comparators or timers |
| Low quiescent current | 14µA typical at 3.6V enables multi-year operation in coin-cell–powered backup circuits and IoT edge nodes |
| Immunity to VCC transients | Withstands negative-going glitches ≤20µs (at 100mV overdrive), reducing false resets in noisy power environments |
Applications
| Telecom Line Card Power Management | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitoring dual DC/DC outputs (5V core, 3.3V I/O) and auxiliary 1.2V FPGA rail in carrier-grade line cards. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting coordinated reset across CPU, FPGA, and PHY upon any rail undervoltage. Use Value: Prevents partial initialization and metastability by holding reset until all three rails stabilize above thresholds for ≥210ms. |
Use Scenario: Ensuring deterministic startup and fault response in modular programmable logic controller backplanes with mixed 24V, 5V, and 3.3V domains. IC Role / Device Role / Timing Role: Supervising main 24V input (via PFI divider), 5V logic rail (VCC1), and 3.3V communication rail (VCC2). Use Value: Enables safe power-fail shutdown via PFO interrupt while maintaining valid reset state down to 0.8V on either supply rail. |
| Battery-Powered Medical Monitor | Set-Top Box Power Sequencing |
Use Scenario: Managing Li-ion battery (3.6V), regulated 3.3V MCU rail, and 1.8V sensor interface rail in portable ECG devices. IC Role / Device Role / Timing Role: Monitoring battery voltage (RSTIN), 3.3V MCU supply (VCC1), and 1.8V analog supply (VCC2) with precise thresholds. Use Value: Triggers graceful firmware shutdown before brownout using PFO signal, while RST prevents corrupted boot sequences. |
Use Scenario: Coordinating power-up of SoC, DDR memory, and HDMI PHY in consumer STBs with tight sequencing requirements. IC Role / Device Role / Timing Role: Supervising 1.2V SoC core (VCC2), 3.3V I/O (VCC1), and 5V USB/HDMI rail (RSTIN via divider). Use Value: Delivers 210ms reset hold time to satisfy DDR initialization timing and avoids race conditions during multi-rail power-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6728KAUD3+ | Same pinout and thresholds, but PFO is open-drain (not push-pull); requires external pullup resistor | Suitable where PFO must drive multiple loads or interface to different voltage domains | Select MAX6728KAUD3+ only if open-drain PFO flexibility is required; otherwise MAX6729KASYD3+ simplifies layout with push-pull output |
| TPS3808G33DBVR | Dual-supply monitor (VDD, VDDIO) only; no RSTIN or PFI/PFO; 3.3V fixed VDD threshold; 200ms timeout | Lacks third-supply monitoring and power-fail warning capability; limited to two-rail systems | Choose TPS3808G33DBVR only for cost-sensitive dual-rail designs without PFI/RSTIN needs; MAX6729KASYD3+ provides full feature parity |
Compared with MAX6728KAUD3+, MAX6729KASYD3+ offers simplified PFO interfacing via push-pull output; compared with TPS3808G33DBVR, it adds essential third-supply monitoring and power-fail alerting - making it the only option supporting true triple-rail supervision with integrated PFI/PFO in SOT23-8.
Availability
MAX6729KASYD3+ is available at Aetrix Electronics and suitable for telecom line cards, industrial PLC modules, battery-powered medical monitors, and set-top box power sequencing requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6729KASYD3+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX6715–MAX6729 family was designed specifically for ultra-low-voltage, multi-rail microprocessor supervision in space- and power-constrained embedded systems - emphasizing precision threshold accuracy, minimal quiescent current, and robust noise immunity.
FAQ
What are the factory-trimmed reset thresholds for MAX6729KASYD3+?
The MAX6729KASYD3+ has factory-trimmed VCC1 and VCC2 reset thresholds of 4.625V and 3.075V respectively, as indicated by the 'SY' suffix per Maxim's Reset Voltage Threshold Suffix Guide. These values are guaranteed over temperature with ±125mV and ±75mV tolerances, enabling precise supervision of 5V and 3.3V rails without external calibration.
Does MAX6729KASYD3+ support monitoring a third supply voltage?
Yes, MAX6729KASYD3+ supports third-supply monitoring via the RSTIN pin, which compares the applied voltage against an internal 626.5mV reference. Using an external resistor divider, users can configure RSTIN to monitor voltages as low as 0.62V - for example, setting a 1.2V rail trip point with R1 = 100kΩ and R2 = 100kΩ yields VEXT_TH = 1.253V.
What is the function of the PFI and PFO pins on MAX6729KASYD3+?
On MAX6729KASYD3+, PFI serves as the noninverting input to an internal comparator with a 626.5mV threshold, while PFO is its active-low push-pull output. When PFI falls below threshold (e.g., due to dropping battery voltage), PFO asserts low within 2µs - providing immediate power-fail warning without reset timeout delay, ideal for initiating controlled shutdown routines.
How does the manual reset (MR) input behave on MAX6729KASYD3+?
The MR input on MAX6729KASYD3+ is active-low with an internal 50kΩ pullup to VCC1. Pulling MR low forces an immediate reset assertion, which remains active for the full 210ms timeout period after MR returns high. This allows hardware-initiated resets via momentary switches or logic signals without external components - and MR accepts TTL/CMOS-compatible levels.
What package type and pin count does MAX6729KASYD3+ use?
MAX6729KASYD3+ uses an 8-pin SOT23-8 package (2.0mm × 2.1mm body, 0.95mm nominal pitch), confirmed by Maxim's Ordering Information table and Pin Configurations section. This compact footprint supports high-density PCB layouts in portable and industrial applications while maintaining thermal performance up to +85°C ambient.
MAX6729KASYD3+ 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:
- 2.188V, 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
MAX6729KASYD3+ FAQ
1.How can I place an order for MAX6729KASYD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6729KASYD3+ 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 MAX6729KASYD3+ reliable?
The price and inventory of MAX6729KASYD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6729KASYD3+ is usually 5 days.
3.What payment methods are accepted for MAX6729KASYD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6729KASYD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6729KASYD3+?
MAX6729KASYD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6729KASYD3+ 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 MAX6729KASYD3+?
For technical support, including MAX6729KASYD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6729KASYD3+ requirements.
6.How does Aetrix verify that MAX6729KASYD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6729KASYD3+ 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 MAX6729KASYD3+ meets industry standards.
7.What is the process for return or replacement of MAX6729KASYD3+?
All MAX6729KASYD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6729KASYD3+, 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 MAX6729KASYD3+ part is unused and in its original packaging.
Return procedure for MAX6729KASYD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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