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Analog Devices Inc./Maxim Integrated MAX6729KARVD3+
- Part No.:
- MAX6729KARVD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6729KARVD3+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,525
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Product details
Overview
MAX6729KARVD3+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (1.575V threshold), VCC2 (0.788V threshold), and an externally adjustable RSTIN input (626.5mV reference) with 210ms minimum reset timeout. It features push-pull active-low RST and PFO outputs, manual reset input (MR), watchdog timer (1.12s normal / 35s startup), and guaranteed reset validity down to VCC1 or VCC2 = 0.8V - used in multivoltage telecom and industrial power management systems.
For engineers reviewing the MAX6729KARVD3+ datasheet, MAX6729KARVD3+ pinout, MAX6729KARVD3+ application, or MAX6729KARVD3+ equivalent, key selection criteria include its triple-supply monitoring capability, push-pull output drive strength, 210ms factory-set reset timeout, and integrated power-fail comparator with PFO output - all validated for -40°C to +85°C operation in space-constrained designs.
Technical Context
The MAX6729KARVD3+ implements dual independent voltage comparators for VCC1 and VCC2 plus a third high-impedance RSTIN comparator referenced to a 626.5mV internal bandgap, enabling precise auxiliary supply monitoring via external resistor divider. Its reset logic asserts RST and PFO simultaneously when any monitored voltage falls below threshold and holds both outputs low for the full 210ms timeout period after recovery.
It integrates a dual-mode watchdog timer: a 35s minimum startup window after reset events (power-up, MR, or watchdog timeout), followed by a 1.12s minimum normal-mode timeout triggered by WDI edge transitions. The PFO output responds to PFI voltage drops with ≤2µs delay and no timeout, supporting early power-fail interrupt generation without affecting system reset timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 1.575V (typ), factory-trimmed - ensures reliable reset assertion for 1.8V I/O rails under brownout conditions |
| VCC2 Reset Threshold | 0.788V (typ), factory-trimmed - supports core supply monitoring down to 0.9V systems |
| RSTIN Reference Voltage | 626.5mV (typ) - enables accurate third-supply monitoring from 0.62V up via external divider |
| Reset Timeout Period | 210ms (min) - provides sufficient hold time for processor initialization and peripheral stabilization |
| Supply Current | 14µA (typ) at 3.6V - minimizes quiescent load on battery-backed or low-power supplies |
| Operating Temperature | -40°C to +85°C - qualified for industrial and telecom equipment environments |
| Watchdog Timeout | 1.12s (min) normal mode - detects software hangs within sub-second response window |
Pinout & Package
MAX6729KARVD3+ is housed in an 8-pin SOT23-8 package (2.0mm × 2.1mm × 1.25mm), optimized for high-density PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1 - drives µP reset pin directly without external pullup |
| 2 | GND | System ground reference for all internal comparators and logic - must be low-impedance connection |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1 - debounced by design; accepts TTL/CMOS levels |
| 4 | PFO | Active-low push-pull power-fail output referenced to VCC1 - signals supply degradation without reset timeout delay |
| 5 | VCC2 | Secondary supply input powering VCC2 comparator and RST2 logic - monitors core or analog rail voltages |
| 6 | VCC1 | Primary supply input powering device core and VCC1 comparator - defines RST/PFO output voltage level |
| 7 | PFI | Power-fail monitor input with 626.5mV internal reference - sets trip point via external resistor divider for auxiliary supply |
| 8 | WDI | Watchdog input with 35s startup / 1.12s normal timeout - requires edge transition to prevent reset assertion |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring | Simultaneous VCC1 (1.575V), VCC2 (0.788V), and RSTIN/PFI (626.5mV) supervision - eliminates need for discrete comparators in multirail systems |
| Push-pull RST and PFO outputs | No external pullup required - reduces BOM count and improves noise immunity in high-speed digital environments |
| Dual-mode watchdog timer | 35s startup window allows full system boot before watchdog enforcement - prevents false resets during initialization |
| Guaranteed reset validity down to 0.8V | Ensures correct reset state even during deep brownout - critical for fail-safe shutdown in power-sensitive applications |
| Low 14µA supply current | Enables use in always-on battery-backed circuits without compromising runtime - verified across full temperature range |
Applications
| Telecom Power Management | Industrial PLC Control |
|---|---|
|
Use Scenario: Monitoring primary 3.3V backplane supply, secondary 1.2V FPGA core rail, and auxiliary -12V bias supply in carrier-grade line cards. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting synchronized reset and PFO interrupt to manage graceful power sequencing and fault logging. Use Value: Prevents configuration corruption during partial supply collapse by holding reset until all three rails stabilize for ≥210ms. |
Use Scenario: Supervising 24V DC input, 5V logic rail, and 3.3V microcontroller supply in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Centralized reset generator with PFO-triggered watchdog escalation - initiates safe state transition on input undervoltage. Use Value: Enables deterministic fail-safe behavior using single IC instead of three discrete supervisors, reducing board area by >40%. |
| Server Baseboard Management | Medical Imaging Power Sequencing |
|
Use Scenario: Validating 12V VRM input, 1.8V memory interface supply, and 0.85V CPU core voltage in BMC subsystems. IC Role / Device Role / Timing Role: Fault-detection hub feeding reset signal to BMC processor and generating PFO interrupt to trigger thermal throttling. Use Value: Achieves <100ns reset assertion jitter across all three rails - meets JEDEC JESD22-A102B reliability requirements. |
Use Scenario: Coordinating power-up of X-ray detector ASIC (1.2V), analog front-end (2.5V), and FPGA (3.3V) in portable ultrasound units. IC Role / Device Role / Timing Role: Sequenced supervisor with MR-initiated calibration reset and WDI-monitored firmware execution. Use Value: Eliminates need for external RC timing networks - ensures repeatable 210ms reset hold time across production lots and temperature. |
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; less suitable for driving interrupt inputs directly | Select MAX6729KARVD3+ when direct-drive PFO capability is needed to reduce component count |
| TPS3808G33DBVR | Dual-supply monitor only (no PFI/RSTIN), fixed 3.3V VDD threshold, 200ms timeout | Lacks auxiliary voltage monitoring and power-fail interrupt functionality | Choose MAX6729KARVD3+ for designs requiring third-supply supervision and independent PFO signaling |
Compared with MAX6728KA+T and TPS3808G33DBVR, the MAX6729KARVD3+ uniquely delivers push-pull PFO output, factory-trimmed 0.788V VCC2 threshold for ultra-low-voltage cores, and integrated RSTIN/PFI dual-function input - enabling compact, feature-complete supervision in single-chip form.
Availability
MAX6729KARVD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and medical imaging equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX6729KARVD3+ 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 demanding industrial, automotive, and communications applications.
The MAX6715–MAX6729 family was designed specifically for multivoltage system supervision in space-constrained, high-reliability applications - delivering triple-supply monitoring, watchdog, and power-fail detection in sub-2mm² packages.
FAQ
What is the exact reset timeout period for MAX6729KARVD3+?
The MAX6729KARVD3+ has a factory-set minimum reset timeout period of 210ms, as indicated by the "D3" suffix in its part number. This value is guaranteed over the full -40°C to +85°C operating temperature range and ensures sufficient hold time for processor initialization and peripheral stabilization before release.
Does MAX6729KARVD3+ support monitoring a negative supply voltage?
Yes, MAX6729KARVD3+ can monitor negative supplies using its PFI input with an external resistor divider configured per Figure 3b in the datasheet. When the negative supply drops, PFO asserts low - enabling early warning interrupts without affecting the main reset function of the MAX6729KARVD3+.
What are the voltage thresholds monitored by MAX6729KARVD3+?
The MAX6729KARVD3+ monitors VCC1 at 1.575V (typ), VCC2 at 0.788V (typ), and uses a 626.5mV (typ) internal reference for RSTIN/PFI - allowing precise supervision of 1.8V I/O, 0.9V cores, and auxiliary supplies down to 0.62V via external resistor networks.
Can MAX6729KARVD3+ operate with VCC1 and VCC2 powered from different sources?
Yes, MAX6729KARVD3+ is explicitly designed for independent VCC1 and VCC2 supplies - each powers its respective comparator and contributes to reset assertion logic. The device guarantees valid reset output as long as either VCC1 or VCC2 remains above 0.8V, supporting flexible power architecture partitioning.
Is the watchdog timer in MAX6729KARVD3+ configurable for different timeout periods?
No, the watchdog timeout periods in MAX6729KARVD3+ are fixed: 35s minimum startup mode after reset events and 1.12s minimum normal mode after the first WDI transition. These values are factory-programmed and not user-adjustable - ensuring consistent behavior across all units of the MAX6729KARVD3+.
MAX6729KARVD3+ 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, 2.625V, 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
MAX6729KARVD3+ FAQ
1.How can I place an order for MAX6729KARVD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6729KARVD3+ 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 MAX6729KARVD3+ reliable?
The price and inventory of MAX6729KARVD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6729KARVD3+ is usually 5 days.
3.What payment methods are accepted for MAX6729KARVD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6729KARVD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6729KARVD3+?
MAX6729KARVD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6729KARVD3+ 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 MAX6729KARVD3+?
For technical support, including MAX6729KARVD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6729KARVD3+ requirements.
6.How does Aetrix verify that MAX6729KARVD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6729KARVD3+ 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 MAX6729KARVD3+ meets industry standards.
7.What is the process for return or replacement of MAX6729KARVD3+?
All MAX6729KARVD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6729KARVD3+, 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 MAX6729KARVD3+ part is unused and in its original packaging.
Return procedure for MAX6729KARVD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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