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Analog Devices Inc./Maxim Integrated MAX6728KARVD3
- Part No.:
- MAX6728KARVD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6728KARVD3.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
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Product details
Overview
MAX6728KARVD3 from Maxim Integrated is a dual-voltage microprocessor supervisory IC monitoring VCC1 (primary supply) and VCC2 (secondary supply), with power-fail input (PFI)/output (PFO), manual-reset (MR), and open-drain active-low RST output. It asserts reset when either supply drops below factory-trimmed thresholds (VTH1 = 4.625 V, VTH2 = 3.075 V), maintains reset for 140 ms minimum timeout, and operates from -40°C to +125°C in an 8-pin SOT23 package. Used in telecom power systems to ensure clean boot and brownout recovery.
For engineers reviewing the MAX6728KARVD3 datasheet, MAX6728KARVD3 pinout, MAX6728KARVD3 application, or MAX6728KARVD3 equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over temp), guaranteed reset validity down to VCC1/VCC2 = 0.8 V, PFI/PFO compatibility with 0.626 V reference, 14 µA typical supply current at 3.6 V, and AEC-Q100-qualified variants for automotive-grade reliability.
Technical Context
The MAX6728KARVD3 integrates two independent voltage comparators for VCC1 and VCC2, each with factory-trimmed thresholds (4.625 V and 3.075 V respectively), hysteresis of 0.5%, and temperature coefficient of 20 ppm/°C. Its power-fail comparator uses the same 0.626 V internal reference as RSTIN, enabling consistent trip-point design across auxiliary monitoring functions.
It features an open-drain active-low RST output referenced to VCC1, push-pull or open-drain PFO referenced to VCC1, MR with 50 kΩ internal pullup to VCC1, and PFI with ±100 nA input leakage. Reset assertion is latched for a fixed 140 ms (min) timeout after all monitored voltages recover above threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625 V (factory-trimmed, ±1.5% over -40°C to +125°C) |
| VCC2 Reset Threshold | 3.075 V (factory-trimmed, ±1.5% over -40°C to +125°C) |
| PFI Threshold Voltage | 626.5 mV (internal reference, enables precise external resistor-divider setup) |
| Reset Timeout Period | 140 ms (minimum duration ensures reliable μP initialization after brownout) |
| Supply Current (ICC1) | 15 µA typ at 3.6 V (ultra-low quiescent current extends battery life in portable systems) |
| Operating Temperature | -40°C to +125°C (supports under-hood automotive and industrial edge applications) |
| Reset Output Type | Open-drain active-low RST (requires external pullup; compatible with bidirectional μP reset pins) |
Pinout & Package
MAX6728KARVD3 is housed in an 8-pin SOT23 package (3.0 mm × 1.7 mm × 1.3 mm), optimized for space-constrained multivoltage systems. Pin assignments are validated per Maxim's official pin description table for MAX6728A variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Open-drain output asserted low during fault; requires external pullup to VCC1; drives μP reset pin directly |
| 2 - GND | Ground reference | Common return path for all internal comparators and logic; must be low-impedance for noise immunity |
| 3 - MR | Manual-reset input | Active-low input with 50 kΩ internal pullup to VCC1; debounced by 1 µs minimum pulse width requirement |
| 4 - VCC2 | Secondary supply input | Powers internal circuitry when VCC2 > VCC1; input for secondary voltage monitor (3.075 V threshold) |
| 5 - PFI | Power-fail input | High-impedance comparator input (±100 nA leakage); monitors external supply via resistor divider tied to 0.626 V reference |
| 6 - VCC1 | Primary supply input | Main power source and reference for RST/PFO outputs; powers device when VCC1 > VCC2; input for primary monitor (4.625 V threshold) |
| 7 - PFO | Power-fail output | Active-low open-drain output; asserts without timeout when PFI < 626.5 mV; used for early warning or interrupt generation |
| 8 - NC | No connect | Unbonded pin; must remain floating per datasheet; no routing or thermal tie required |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent supply monitoring | Simultaneous VCC1 (4.625 V) and VCC2 (3.075 V) supervision eliminates need for discrete comparators and reduces BOM count |
| Power-fail detection with dedicated PFI/PFO | Enables graceful shutdown or data save before main rail collapse using same 0.626 V reference as RSTIN |
| Guaranteed reset validity down to 0.8 V | Ensures deterministic reset behavior during deep brownout conditions where VCC1 or VCC2 dips near 0.8 V |
| 14 µA typical supply current | Minimizes standby power draw in always-on subsystems such as network management controllers or IoT edge nodes |
| 8-pin SOT23 footprint | Provides full dual-supply + PFI/PFO functionality in same area as legacy 5-pin supervisors, easing layout migration |
Applications
| Telecom Power Management | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring redundant 48 V DC-to-3.3 V and 12 V DC-to-5 V converter outputs in carrier-grade base station power supplies. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting RST on any rail collapse, while PFO triggers firmware-initiated backup switchover before full failure. Use Value: Prevents system lockup during partial power loss; 140 ms reset timeout aligns with FPGA configuration time. | Use Scenario: Supervising 24 V field bus and 3.3 V logic rails in modular programmable logic controller backplanes. IC Role / Device Role / Timing Role: Ensures deterministic restart after voltage sag on industrial 24 V supply; MR pin enables field-service reset without power cycle. Use Value: Eliminates need for external RC reset timers; guaranteed operation to -40°C supports outdoor deployment. |
| Automotive ADAS Domain Controller | Network Equipment Line Cards |
Use Scenario: Validating 5 V camera sensor supply and 1.8 V SoC core rail in vision processing units subject to load dump transients. IC Role / Device Role / Timing Role: Monitors both rails independently; PFI tracks pre-regulated battery input to initiate safe shutdown before undervoltage lockout. Use Value: Factory-trimmed thresholds eliminate calibration; 0.8 V reset validity covers cold-crank scenarios. | Use Scenario: Managing power sequencing and fault response in 10G Ethernet line cards with multiple isolated DC/DC converters. IC Role / Device Role / Timing Role: RST coordinates synchronized reset across FPGAs and PHYs; PFO signals upstream switch fabric of impending rail failure. Use Value: Open-drain RST allows wired-OR with other supervisors; 14 µA ICC1 reduces thermal load in dense card layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6729KARVD3 | Same pinout, identical VTH1/VTH2 thresholds and 140 ms timeout, but includes watchdog timer input (WDI) | Required where software hang detection is needed alongside power monitoring | Select MAX6729KARVD3 only if WDI-driven watchdog functionality is explicitly required; otherwise MAX6728KARVD3 offers lower complexity and cost |
| TPS3808G33DBVR | Single-supply supervisor (3.3 V only), no PFI/PFO, different timeout options (200 ms standard), SOT23-6 package | Limited to single-rail systems; lacks auxiliary monitoring capability | Use only for cost-sensitive single-supply designs where PFI/PFO and dual-threshold precision are unnecessary |
Compared with MAX6729KARVD3, MAX6728KARVD3 removes watchdog circuitry to reduce quiescent current and simplify firmware integration; compared with TPS3808G33DBVR, it provides true dual-rail supervision with matched thresholds and integrated power-fail signaling-critical for systems requiring coordinated response across multiple voltage domains.
Availability
MAX6728KARVD3 is available at Aetrix Electronics and suitable for telecom power management, industrial PLC I/O modules, automotive ADAS domain controllers, and network equipment line cards requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6728KARVD3 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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX6715A–MAX6729A family delivers ultra-low-voltage, multirail supervisory circuits targeting systems with tight power budgets and stringent reliability requirements-especially where dual/three-rail coordination and early power-fail warning are essential.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6728KARVD3?
The MAX6728KARVD3 has factory-trimmed reset thresholds of 4.625 V for VCC1 and 3.075 V for VCC2, with ±1.5% tolerance over the full -40°C to +125°C operating range. These values are confirmed in the Electrical Characteristics table of the official datasheet and correspond to the "RV" suffix in the part number. The MAX6728KARVD3 does not support adjustable thresholds for VCC1 or VCC2-only the RSTIN and PFI inputs use the 0.626 V internal reference.
Does the MAX6728KARVD3 include a watchdog timer function?
No, the MAX6728KARVD3 does not include a watchdog timer. It is a dual-supply supervisor with PFI/PFO and MR functionality only. The watchdog input (WDI) is present on the pin-compatible MAX6729KARVD3 variant but omitted in MAX6728KARVD3. This simplifies firmware requirements and reduces quiescent current to 14 µA typical-making MAX6728KARVD3 ideal for applications where software hang detection is handled externally or not required.
What is the function of Pin 8 (NC) on the MAX6728KARVD3?
Pin 8 on the MAX6728KARVD3 is a no-connect (NC) terminal-unbonded and electrically inactive. Per Maxim's official pin description, it must remain unconnected and un-routed on PCBs. No thermal pad, ground tie, or decoupling capacitor should be attached to Pin 8. This differs from some other MAX67xx variants (e.g., MAX6725/MAX6726) that use Pin 8 for RST2; MAX6728KARVD3 implements only one reset output (RST on Pin 1).
Can the MAX6728KARVD3 monitor a third voltage rail?
No, the MAX6728KARVD3 does not support third-rail monitoring. Unlike MAX6723–MAX6727 variants, it lacks the RSTIN input required for externally adjustable threshold monitoring. Its supervision is strictly limited to VCC1 and VCC2. For triple-voltage monitoring, engineers should select MAX6723KARVD3 or MAX6727KARVD3-both of which include RSTIN and share the same 8-pin SOT23 package and 140 ms timeout.
What is the maximum allowable leakage current on the PFI pin of the MAX6728KARVD3?
The PFI pin of the MAX6728KARVD3 has a maximum input leakage current of ±100 nA over temperature, as specified in the Electrical Characteristics table. This low leakage enables use of high-value resistor dividers (e.g., 1 MΩ + 1 MΩ) for power-fail threshold setting without significant voltage error. Designers must ensure external circuitry sourcing or sinking more than 50 nA is avoided-particularly when interfacing with weak-drive logic or high-impedance sensors-to maintain trip-point accuracy.
MAX6728KARVD3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6728KARVD3 FAQ
1.How can I place an order for MAX6728KARVD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6728KARVD3 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 MAX6728KARVD3 reliable?
The price and inventory of MAX6728KARVD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6728KARVD3 is usually 5 days.
3.What payment methods are accepted for MAX6728KARVD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6728KARVD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6728KARVD3?
MAX6728KARVD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6728KARVD3 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 MAX6728KARVD3?
For technical support, including MAX6728KARVD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6728KARVD3 requirements.
6.How does Aetrix verify that MAX6728KARVD3 is sourced from the original manufacturer or authorized distributors?
All MAX6728KARVD3 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 MAX6728KARVD3 meets industry standards.
7.What is the process for return or replacement of MAX6728KARVD3?
All MAX6728KARVD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6728KARVD3, 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 MAX6728KARVD3 part is unused and in its original packaging.
Return procedure for MAX6728KARVD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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