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Analog Devices Inc./Maxim Integrated MAX6729KALTD3+T
- Part No.:
- MAX6729KALTD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6729KALTD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,892
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Product details
Overview
MAX6729KALTD3+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (primary), VCC2 (secondary), and RSTIN (auxiliary) supply rails with factory-trimmed thresholds of 2.55V/2.625V/2.70V (VTH1) and 2.55V/2.625V/2.70V (VTH2), 626.5mV reference for RSTIN, and 210ms minimum reset timeout. It provides push-pull active-low RST and PFO outputs, manual reset input (MR), watchdog timer (35s startup / 1.12s normal), and power-fail detection - used in telecom power management and multivoltage embedded systems.
For engineers reviewing the MAX6729KALTD3+T datasheet, MAX6729KALTD3+T pinout, MAX6729KALTD3+T application, or MAX6729KALTD3+T equivalent, key selection criteria include triple-supply monitoring capability, guaranteed reset validity down to VCC1/VCC2 = 0.8V, low 14µA typical supply current at 3.6V, immunity to short VCC transients, and compatibility with industrial temperature range (-40°C to +85°C) designs.
Technical Context
The MAX6729KALTD3+T integrates three independent voltage comparators (VCC1, VCC2, RSTIN), a programmable reset timeout timer, dual-mode watchdog (35s min startup / 1.12s min normal), manual reset logic with 50kΩ internal pullup, and power-fail comparator with PFI/PFO interface. Its BiCMOS process ensures stable threshold tempco (20ppm/°C) and hysteresis (0.5% of VTH).
All monitored inputs feature high-impedance sensing (RSTIN/PFI leakage ±25nA), and reset assertion is synchronized across sources: VCC1/VCC2 undervoltage, RSTIN < 626.5mV, MR low, or WDI timeout. The push-pull RST and PFO outputs drive directly to VCC1 with VOL ≤ 0.4V at 3.2mA sink, enabling direct µP reset signaling without external pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.55V / 2.625V / 2.70V (factory-trimmed, falling edge) |
| VCC2 Threshold | 2.55V / 2.625V / 2.70V (factory-trimmed, falling edge) |
| RSTIN Reference | 626.5mV internal bandgap reference for third-rail monitoring |
| Reset Timeout | 210ms minimum (D3 suffix), deterministic after all supplies recover |
| Supply Current | 14µA typical at 3.6V, enabling battery-backed system monitoring |
| Operating Temp | -40°C to +85°C, qualified for industrial embedded deployment |
| Reset Validity | Guaranteed correct logic state down to VCC1 or VCC2 = 0.8V |
Pinout & Package
MAX6729KALTD3+T is housed in an 8-pin SOT23-8 package (2.0mm × 2.1mm × 1.25mm), surface-mount compatible with standard reflow profiles and IPC-7351B footprint MSOIC8_200.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts when any monitored rail fails or MR is pulled low |
| 2 | GND | Analog/digital ground reference for all comparators and logic |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; 1µs minimum pulse width required |
| 4 | PFO | Active-low push-pull power-fail output referenced to VCC1; asserts independently of reset timeout when PFI < 626.5mV |
| 5 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal circuitry when > VCC1 and sets VTH2 threshold |
| 6 | VCC1 | Primary supply input (1.8V–5.0V range); powers device when > VCC2 and sets VTH1 threshold |
| 7 | PFI | Power-fail monitor input with 626.5mV internal reference; used to detect brownout on auxiliary rails via resistor divider |
| 8 | WDI | Watchdog input; reset triggered if no edge detected for >1.12s (normal mode) after initial 35s startup window |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode watchdog timer | 35s minimum startup period enables full system boot before normal 1.12s monitoring begins |
| Triple independent voltage monitoring | VCC1, VCC2, and RSTIN each with dedicated comparator and hysteresis (0.5% VTH) |
| Push-pull RST and PFO outputs | Eliminates need for external pullup resistors; drives directly to µP reset and interrupt pins |
| Guaranteed operation at 0.8V | Valid reset assertion even during deep brownout conditions where VCC1 or VCC2 drops to 0.8V |
| Low 14µA supply current | Enables always-on supervision in battery-powered or energy-sensitive applications |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Monitoring primary 3.3V core, secondary 2.5V I/O, and auxiliary 1.2V FPGA rail in a 48V DC-fed telecom shelf. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting coordinated reset during AC/DC converter fault or hot-swap event. Use Value: Prevents partial initialization by holding µP in reset until all three rails stabilize above their 2.625V thresholds and remain valid for ≥210ms. |
Use Scenario: Supervising 24V field bus supply, 5V logic rail, and 3.3V microcontroller core in DIN-rail mounted PLC modules. IC Role / Device Role / Timing Role: Detecting undervoltage on 24V bus via PFI divider while using VCC1/VCC2 for local regulation monitoring. Use Value: Triggers immediate PFO interrupt for orderly shutdown and simultaneous RST assertion to halt firmware execution before corruption occurs. |
| Server Baseboard Management | Medical Diagnostic Imaging Systems |
|
Use Scenario: Ensuring reliable boot sequencing across multiple voltage domains (12V, 5V, 3.3V, 1.8V) in BMC firmware-controlled servers. IC Role / Device Role / Timing Role: Using RSTIN to monitor a critical 1.8V DDR termination rail while VCC1/VCC2 cover main logic supplies. Use Value: Provides deterministic 210ms reset hold time after all rails exceed thresholds, eliminating race conditions during cold start. |
Use Scenario: Supervising isolated 5V analog sensor supply, 3.3V digital acquisition rail, and 1.2V ADC core in portable ultrasound units. IC Role / Device Role / Timing Role: Leveraging watchdog timer to detect firmware hangs during real-time image processing loops. Use Value: Dual-mode watchdog prevents false resets during long boot sequences while ensuring rapid recovery (<1.12s) from software lockups. |
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 triple-monitor architecture, but open-drain PFO output instead of push-pull | Requires external pullup for PFO; suitable where interrupt line must be shared with other open-drain devices | Select MAX6728KA+T when system-level bus arbitration requires wired-OR interrupt signaling |
| TPS3808G33DBVR | Dual-supply monitor only (no RSTIN/PFI), fixed 3.3V VDD threshold, 200ms timeout, SOT23-6 package | Lacks auxiliary rail monitoring and power-fail functionality; lower integration for simpler systems | Choose TPS3808G33DBVR for cost-sensitive dual-rail applications without watchdog or PFI requirements |
Compared with MAX6729KALTD3+T, MAX6728KA+T offers identical supervision logic but requires external pullup for PFO, while TPS3808G33DBVR reduces BOM count in dual-rail designs but omits RSTIN, PFI, and dual-mode watchdog - making MAX6729KALTD3+T optimal for complex multivoltage systems requiring autonomous fail-safe response.
Availability
MAX6729KALTD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and medical imaging equipment requiring stable component supply, long-lifecycle assurance, and guaranteed -40°C to +85°C operation.
Supply support for MAX6729KALTD3+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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MAX6715–MAX6729 family was designed specifically for multivoltage embedded systems needing compact, ultra-low-power supervision with triple-rail monitoring, watchdog safety, and power-fail warning - targeting space-constrained, reliability-critical applications.
FAQ
What voltage thresholds does MAX6729KALTD3+T monitor for VCC1 and VCC2?
MAX6729KALTD3+T monitors VCC1 and VCC2 at factory-trimmed thresholds of 2.55V (min), 2.625V (typ), and 2.70V (max) for both rails, as indicated by the 'KA' suffix in the part number per Maxim's Reset Voltage Threshold Suffix Guide. These values apply to falling-edge detection and include 0.5% hysteresis relative to typical threshold.
Does MAX6729KALTD3+T support monitoring a third voltage rail, and how is it configured?
Yes, MAX6729KALTD3+T supports third-rail monitoring via the RSTIN pin, which compares the applied voltage against a precise 626.5mV internal reference. To monitor a higher voltage (e.g., 12V), connect an external resistor divider between the rail and GND, with the midpoint fed to RSTIN - the threshold is set by VEXT_TH = 626.5mV × (R1 + R2)/R2.
What is the function of the PFI and PFO pins on MAX6729KALTD3+T?
PFI is the power-fail input pin, internally compared to a 626.5mV reference; when PFI falls below this level, PFO (power-fail output) asserts low immediately - without reset timeout delay - to signal impending supply failure. PFO is push-pull on MAX6729KALTD3+T, driving directly to VCC1, enabling use as an interrupt source independent of the main reset function.
How does the watchdog timer operate on MAX6729KALTD3+T, and what are its timing modes?
MAX6729KALTD3+T features a dual-mode watchdog timer: after any reset event (power-up, MR, or watchdog timeout), it enters a 35s minimum startup mode to allow full system initialization; upon first valid WDI edge, it switches to 1.12s minimum normal mode. This prevents spurious resets during boot while ensuring rapid detection of firmware hangs during steady-state operation.
What package type and pin count does MAX6729KALTD3+T use, and is it RoHS-compliant?
MAX6729KALTD3+T uses an 8-pin SOT23-8 (also labeled MSOIC8) package measuring 2.0mm × 2.1mm × 1.25mm, with lead-free +T suffix confirming RoHS compliance and halogen-free construction. The package supports standard reflow soldering and is compatible with automated pick-and-place assembly for high-volume manufacturing.
MAX6729KALTD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 3.075V, 4.625V, 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
MAX6729KALTD3+T FAQ
1.How can I place an order for MAX6729KALTD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6729KALTD3+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 MAX6729KALTD3+T reliable?
The price and inventory of MAX6729KALTD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6729KALTD3+T is usually 5 days.
3.What payment methods are accepted for MAX6729KALTD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6729KALTD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6729KALTD3+T?
MAX6729KALTD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6729KALTD3+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 MAX6729KALTD3+T?
For technical support, including MAX6729KALTD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6729KALTD3+T requirements.
6.How does Aetrix verify that MAX6729KALTD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6729KALTD3+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 MAX6729KALTD3+T meets industry standards.
7.What is the process for return or replacement of MAX6729KALTD3+T?
All MAX6729KALTD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6729KALTD3+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 MAX6729KALTD3+T part is unused and in its original packaging.
Return procedure for MAX6729KALTD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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