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Analog Devices Inc./Maxim Integrated MAX6728KAVHD3+
- Part No.:
- MAX6728KAVHD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6728KAVHD3+.pdf
- Description:
- MAX6728 TRIPLE, ULTRA-LOW-VOLTAG
- Quantity:
- Payment:
- Shipping:
Inventory:385
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Product details
Overview
MAX6728KAVHD3+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (primary), VCC2 (secondary), and PFI (power-fail input) with factory-trimmed thresholds of 4.625V (VTH1), 3.075V (VTH2), and 626.5mV (VPFI). It provides open-drain active-low RST and PFO outputs, 210ms minimum reset timeout, and operates from -40°C to +85°C. It ensures reliable system reset in multivoltage embedded power management applications such as telecom equipment and industrial controllers.
For engineers reviewing the MAX6728KAVHD3+ datasheet, MAX6728KAVHD3+ pinout, MAX6728KAVHD3+ application, or MAX6728KAVHD3+ equivalent, key selection criteria include its triple-supply monitoring capability, guaranteed reset validity down to VCC1/VCC2 = 0.8V, 14µA typical supply current at 3.6V, and integrated power-fail comparator with 2µs propagation delay - all critical for low-power, high-reliability embedded systems requiring deterministic brownout response.
Technical Context
The MAX6728KAVHD3+ implements independent voltage comparators for VCC1, VCC2, and PFI, each referenced to precision internal bandgap references (VTH1 = 4.625V ±125mV, VTH2 = 3.075V ±75mV, VPFI = 626.5mV ±15.5mV), with 0.5% typical hysteresis. Its reset logic asserts RST low when any monitored voltage falls below its threshold and holds it for a fixed 210ms (min) timeout after recovery.
It integrates a power-fail comparator with dedicated PFI/PFO signal path (2µs delay), manual reset input (MR) with 50kΩ internal pullup, and guarantees valid reset output state even when VCC1 or VCC2 drops to 0.8V - enabling robust operation during deep brownout conditions without external support circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (min 4.500V, max 4.750V) - sets primary supply brownout detection point for 5V/4.8V rail monitoring |
| VCC2 Reset Threshold | 3.075V (min 3.000V, max 3.150V) - enables reliable monitoring of 3.3V I/O or core rails |
| PFI Threshold Voltage | 626.5mV (min 611mV, max 642mV) - allows precise external resistor-divider setup for auxiliary supply or battery monitoring |
| Reset Timeout Period | 210ms (min 140ms, max 280ms) - ensures µP completes full initialization before release from reset |
| Supply Current | 14µA (typ) at 3.6V - supports ultra-low-power operation in battery-backed or energy-constrained systems |
| Operating Temperature | -40°C to +85°C - qualified for industrial and telecom-grade environmental stress |
| Reset Output Type | Open-drain active-low RST - compatible with bidirectional µP reset pins and flexible pullup voltage selection |
| PFO Output Type | Open-drain active-low PFO - provides asynchronous power-fail interrupt without reset timeout dependency |
Pinout & Package
MAX6728KAVHD3+ is housed in an 8-pin SOT23-8 package (2.0mm × 2.1mm × 1.25mm), optimized for space-constrained PCB layouts while supporting thermal dissipation up to 714mW at +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output; asserted when VCC1/VCC2/PFI fall below thresholds or MR is pulled low |
| 2 | GND | System ground reference for all internal comparators and logic |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; initiates reset on logic-low pulse ≥1µs |
| 4 | PFO | Active-low open-drain power-fail output; asserts immediately when PFI < 626.5mV, no timeout applied |
| 5 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal circuitry and sets VTH2 comparator reference |
| 6 | VCC1 | Primary supply input (1.8V–5.0V range); powers device and sets VTH1 comparator reference |
| 7 | PFI | Power-fail monitor input; high-impedance node (±25nA) for resistor-divider network to set custom trip point |
| 8 | NC | No-connect pin - left unconnected per datasheet; not internally bonded |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent voltage monitoring | Simultaneous supervision of VCC1 (4.625V), VCC2 (3.075V), and PFI (626.5mV) enables single-chip protection for complex multirail systems |
| Guaranteed reset validity down to 0.8V | Ensures deterministic reset assertion even during severe brownout - eliminates need for external undervoltage lockout (UVLO) |
| 2µs PFI-to-PFO propagation delay | Enables fast, deterministic power-fail interrupt generation for orderly software shutdown before complete supply collapse |
| 14µA typical supply current | Reduces quiescent power draw in always-on subsystems - critical for battery-operated or energy-harvesting designs |
| 210ms minimum reset timeout | Provides sufficient hold time for slow-start DC/DC converters and firmware initialization sequences |
| Immunity to short VCC transients | Rejects glitches ≤20µs (at 100mV overdrive), preventing spurious resets in electrically noisy environments |
Applications
| Telecom Power Sequencing | Industrial PLC Controller |
|---|---|
Use Scenario: Monitoring 48V-to-5V/3.3V/1.2V distributed power architecture in base station line cards. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting RST until all rails stabilize, then holding reset for 210ms to synchronize FPGA and DSP boot. Use Value: Prevents partial initialization and latch-up by ensuring all voltage domains meet spec before releasing processor reset. |
Use Scenario: Supervising 24V input, 5V logic, and 3.3V MCU core in programmable logic controller backplane. IC Role / Device Role / Timing Role: Detects brownout on 24V field supply via PFI divider and triggers immediate PFO interrupt for safe I/O shutdown. Use Value: Enables deterministic fail-safe behavior without µP intervention - meets IEC 61508 SIL-2 functional safety requirements. |
| Medical Diagnostic Imaging | Network Switch ASIC Management |
Use Scenario: Ensuring clean power-up of X-ray detector sensor array powered by three isolated DC/DC rails. IC Role / Device Role / Timing Role: Monitors VCC1 (5V analog bias), VCC2 (3.3V digital interface), and PFI (1.8V sensor core) with independent thresholds. Use Value: Eliminates need for discrete supervisors - reduces BOM count and improves board-level reliability in Class II medical devices. |
Use Scenario: Managing power sequencing and fault reporting for multi-core switch ASIC with 12V, 3.3V, and 1.0V supplies. IC Role / Device Role / Timing Role: Uses MR input for hot-swap controller-initiated reset and PFO to flag pre-fail condition to system management controller. Use Value: Provides hardware-level coordination between power delivery and firmware - avoids race conditions during dynamic load changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6729KA+T | Push-pull RST and PFO outputs instead of open-drain; identical thresholds, timeout, and pinout except Pin 4 = PFO (push-pull) | Requires VCC1-referenced pullup for reset signaling; unsuitable for bidirectional µP reset pins without series resistor | Select MAX6729KA+T only when driving CMOS inputs directly or when level-shifting is unnecessary |
| TPS3808G33DBVR | Dual-supply monitor (VDD only), 3.3V fixed threshold, 200ms timeout, SOT23-6 package - lacks PFI/PFO and VCC2 monitoring | Cannot replace triple-monitoring function; requires additional external circuitry for auxiliary supply supervision | Use only as cost-optimized alternative in single-rail systems where PFI and secondary rail monitoring are omitted |
Compared with MAX6728KAVHD3+, MAX6729KA+T offers push-pull drive strength but sacrifices interface flexibility, while TPS3808G33DBVR reduces functionality to dual-rail supervision - making MAX6728KAVHD3+ the only option supporting true triple-voltage, open-drain, and power-fail interrupt capability in an 8-pin SOT23.
Availability
MAX6728KAVHD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and medical imaging systems requiring stable component supply, long-term lifecycle assurance, and guaranteed lead-free compliance.
Supply support for MAX6728KAVHD3+ 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 space-constrained, multivoltage embedded systems requiring deterministic power-on reset, brownout protection, and hardware-based power-fail warning - targeting applications where discrete solutions increase risk and footprint.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6728KAVHD3+?
The MAX6728KAVHD3+ has a factory-trimmed VCC1 reset threshold of 4.625V, with a guaranteed range of 4.500V (min) to 4.750V (max) across temperature and process variation. This value is encoded in the "KV" suffix per Maxim's Reset Voltage Threshold Suffix Guide and applies specifically to the MAX6728KAVHD3+ variant - not the broader MAX6728 family.
Does the MAX6728KAVHD3+ support monitoring a negative supply voltage?
Yes, the MAX6728KAVHD3+ can monitor negative supplies using its PFI input with an appropriate resistor-divider configuration as shown in Figure 3b of the datasheet. When a negative rail drops, PFO asserts high (since PFO is open-drain and pulled up externally), providing a direct hardware indication usable for interrupt-driven shutdown sequences.
What is the function of Pin 8 on the MAX6728KAVHD3+?
Pin 8 on the MAX6728KAVHD3+ is a no-connect (NC) terminal - it is not internally bonded and must be left unconnected on the PCB. This is explicitly confirmed in the Pin Description table (page 7) and Selector Guide (page 14) of the official MAX6715–MAX6729 datasheet.
How does the power-fail output (PFO) behave relative to the reset output (RST) on the MAX6728KAVHD3+?
The PFO output on the MAX6728KAVHD3+ asserts immediately (within 2µs) when PFI falls below 626.5mV and deasserts immediately when PFI rises above threshold - with no timeout period. In contrast, RST remains asserted for the full 210ms minimum timeout after all monitored voltages recover, ensuring µP reset hold time is maintained regardless of PFO activity.
Can the MAX6728KAVHD3+ operate with VCC1 = 2.5V and VCC2 = 1.8V simultaneously?
Yes, the MAX6728KAVHD3+ is fully specified to operate with VCC1 as low as 1.8V and VCC2 as low as 0.9V, including simultaneous operation at VCC1 = 2.5V and VCC2 = 1.8V. Electrical Characteristics tables confirm supply current (ICC1/ICC2), reset thresholds, and output performance remain valid across this full voltage range.
MAX6728KAVHD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.313V, 1.575V, Adj
- Output:
- Open Drain or Open Collector
- 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
MAX6728KAVHD3+ FAQ
1.How can I place an order for MAX6728KAVHD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6728KAVHD3+ 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 MAX6728KAVHD3+ reliable?
The price and inventory of MAX6728KAVHD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6728KAVHD3+ is usually 5 days.
3.What payment methods are accepted for MAX6728KAVHD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6728KAVHD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6728KAVHD3+?
MAX6728KAVHD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6728KAVHD3+ 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 MAX6728KAVHD3+?
For technical support, including MAX6728KAVHD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6728KAVHD3+ requirements.
6.How does Aetrix verify that MAX6728KAVHD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6728KAVHD3+ 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 MAX6728KAVHD3+ meets industry standards.
7.What is the process for return or replacement of MAX6728KAVHD3+?
All MAX6728KAVHD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6728KAVHD3+, 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 MAX6728KAVHD3+ part is unused and in its original packaging.
Return procedure for MAX6728KAVHD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6728KAVHD3+ Tags
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MIC826SYMT-TR
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