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Analog Devices Inc./Maxim Integrated MAX6728KATGD3
- Part No.:
- MAX6728KATGD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6728KATGD3.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:291
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Product details
Overview
MAX6728KATGD3 from Maxim Integrated is a dual-voltage microprocessor supervisory IC monitoring VCC1 (primary) and VCC2 (secondary) supply rails, with factory-trimmed reset thresholds (VTH1 = 4.625 V, VTH2 = 3.075 V), 210 ms minimum reset timeout, and integrated power-fail input/output (PFI/PFO). It asserts active-low open-drain RST and PFO outputs when either supply drops below threshold and maintains reset for the full timeout period - used in telecom power systems requiring reliable brownout detection and orderly shutdown.
For engineers reviewing the MAX6728KATGD3 datasheet, MAX6728KATGD3 pinout, MAX6728KATGD3 application, or MAX6728KATGD3 equivalent, key selection criteria include dual-rail voltage monitoring capability, guaranteed reset validity down to VCC1/VCC2 = 0.8 V, PFI/PFO compatibility with negative/positive supply monitoring, and AEC-Q100-qualified variants for automotive-grade designs.
Technical Context
The MAX6728KATGD3 integrates two independent voltage comparators with internal 4.625 V and 3.075 V thresholds for VCC1 and VCC2, respectively, plus a dedicated high-impedance PFI input referenced to a 626.5 mV internal reference. Its PFO output deasserts immediately upon PFI recovery - no timeout - enabling fast power-fail warning without system reset interference.
It features an open-drain RST output asserted low on VCC1/VCC2 undervoltage, MR assertion, or PFI fault, with reset held for exactly 210 ms (min) after all monitored conditions return to valid levels. The device operates across –40°C to +125°C and draws only 15 µA typical supply current at 3.6 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625 V (factory-trimmed, ±125 mV tolerance); ensures reliable reset assertion before core logic fails under 5 V rail sag |
| VCC2 Reset Threshold | 3.075 V (factory-trimmed, ±75 mV tolerance); matches common I/O supply rails like 3.3 V with margin for droop |
| Reset Timeout Period | 210 ms (min); provides sufficient time for processor initialization and peripheral stabilization post-power recovery |
| PFI Input Threshold | 626.5 mV (typical); enables precise external resistor-divider setup for custom power-fail trip points on any supply |
| Supply Current | 15 µA (typ at 3.6 V); minimizes quiescent load in battery-backed or energy-sensitive applications |
| Operating Temperature | –40°C to +125°C; supports deployment in industrial control cabinets and automotive under-hood environments |
| Reset Output Type | Open-drain RST and PFO; allows flexible pull-up to any logic rail and wired-OR configuration with other reset sources |
Pinout & Package
MAX6728KATGD3 is housed in an 8-pin SOT23 package (SOT23-8), with exposed pad for thermal performance. Pin functions are validated per Maxim's official pin description table for MAX6728A/MAX6729A/MAX6797A family.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Open-drain output asserted low during VCC1/VCC2 undervoltage, MR activation, or PFI fault; requires external pullup |
| 2 - GND | Ground reference | Common return path for all internal comparators, watchdog, and output drivers; must be low-impedance |
| 3 - MR | Manual-reset input | Active-low input with 50 kΩ internal pullup to VCC1; initiates reset when pulled to GND for ≥1 µs |
| 4 - VCC2 | Secondary supply input | Powers internal circuitry when VCC2 > VCC1; input for 3.075 V comparator; valid range: 0.8 V to 5.5 V |
| 5 - VCC1 | Primary supply input | Main power source and input for 4.625 V comparator; powers device when VCC1 > VCC2; valid range: 0.8 V to 5.5 V |
| 6 - PFI | Power-fail monitor input | High-impedance comparator input (IIN ≤ ±100 nA); triggers PFO when voltage falls below 626.5 mV |
| 7 - PFO | Active-low power-fail output | Open-drain output asserted low when PFI < 626.5 mV; deasserts immediately on recovery - no timeout delay |
| 8 - NC | No connect | Unbonded pin; must remain floating or grounded per layout guidelines; no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of primary (4.625 V) and secondary (3.075 V) rails eliminates need for discrete comparators and reduces BOM count |
| Power-fail input/output (PFI/PFO) | Enables early warning of supply degradation without asserting system reset - critical for controlled data save and shutdown sequences |
| Guaranteed reset validity down to 0.8 V | Ensures deterministic reset behavior during deep brownout conditions where many supervisors lose output control |
| Low 15 µA supply current | Reduces standby power in always-on subsystems such as remote telemetry nodes and smart sensors |
| –40°C to +125°C operation | Validated performance across full industrial and extended automotive temperature ranges without derating |
| Open-drain RST and PFO outputs | Supports mixed-voltage system integration and multi-source reset arbitration via wired-OR topology |
Applications
| Telecom Power Management | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Monitoring 48 V DC-to-5 V and 3.3 V DC-DC converter outputs in carrier-grade line cards subject to lightning-induced transients. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting RST on either rail collapse and PFO on pre-fail condition to trigger backup battery switchover. Use Value: Prevents corrupted firmware writes during AC mains interruption by ensuring clean reset before brownout completes. |
Use Scenario: Supervising 24 V field power and 5 V logic supply in DIN-rail mounted programmable logic controllers operating in factory-floor environments. IC Role / Device Role / Timing Role: Provides fail-safe reset coordination between CPU and isolated I/O ASICs using shared open-drain RST bus. Use Value: Eliminates spurious resets from EMI-coupled supply noise due to 20 µs VCC-to-RST propagation delay and 0.5% hysteresis. |
| Automotive Body Control Module | Medical Infusion Pump Power System |
|
Use Scenario: Validating 12 V battery-derived 5 V MCU rail and 3.3 V sensor interface rail in body control units exposed to cold-crank and load-dump events. IC Role / Device Role / Timing Role: Monitors both rails with factory-trimmed thresholds and uses PFI to detect pre-drop in 12 V input via resistor divider. Use Value: Enables predictive shutdown before undervoltage lockout disables safety-critical CAN communication. |
Use Scenario: Ensuring safe power sequencing and failure response in battery-powered infusion pumps requiring FDA-compliant fault logging. IC Role / Device Role / Timing Role: Generates non-maskable interrupt via PFO on main battery sag while holding RST active until backup supercapacitor engages. Use Value: Guarantees delivery completion or safe stop within 210 ms timeout window even during rapid battery depletion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6729KATGD3 | Same pinout and electrical specs, but includes watchdog timer input (WDI) not present on MAX6728KATGD3 | Required where software execution monitoring is needed alongside voltage supervision | Select MAX6729KATGD3 only if watchdog functionality is required; otherwise MAX6728KATGD3 offers lower complexity and cost |
| TPS3808G33DBVR | Single-supply supervisor (3.3 V only), no PFI/PFO, no dual-rail monitoring; 200 ms timeout, SOT23-6 package | Limited to single-rail systems; lacks power-fail warning capability and secondary rail supervision | Use only for cost-sensitive, single-rail applications where PFI/PFO and VCC2 monitoring are unnecessary |
Compared with MAX6729KATGD3, MAX6728KATGD3 removes WDI complexity for simpler firmware stacks; compared with TPS3808G33DBVR, it adds essential dual-rail and PFI/PFO functionality required in multivoltage embedded systems - making it the minimal-fit solution for telecom and industrial power sequencing.
Availability
MAX6728KATGD3 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and automotive body electronics requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for MAX6728KATGD3 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 precision analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX6715A–MAX6729A/MAX6797A product line delivers ultra-low-voltage, dual/triple-supply supervisory circuits optimized for reliability-critical embedded systems where power integrity directly impacts functional safety.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on MAX6728KATGD3?
The MAX6728KATGD3 has factory-trimmed reset thresholds of 4.625 V (±125 mV) for VCC1 and 3.075 V (±75 mV) for VCC2, as defined by the "TG" suffix in its part number per Maxim's Reset Voltage Threshold Suffix Guide. These values are guaranteed over –40°C to +125°C and do not require external calibration.
Does MAX6728KATGD3 support power-fail detection on supplies other than VCC1 or VCC2?
Yes - the MAX6728KATGD3 supports external power-fail detection via its PFI pin, which compares an externally divided voltage against a 626.5 mV internal reference. This allows monitoring of battery inputs, negative rails, or auxiliary supplies independent of VCC1/VCC2, with PFO providing immediate active-low alert.
What is the reset timeout period for MAX6728KATGD3, and is it adjustable?
The MAX6728KATGD3 has a fixed minimum reset timeout period of 210 ms, indicated by the "D3" suffix. This value is factory-programmed and not adjustable via external components. The actual timeout may vary slightly with temperature but remains ≥210 ms across the full operating range.
Can MAX6728KATGD3 operate reliably when VCC1 or VCC2 drops below 1.0 V?
Yes - the MAX6728KATGD3 guarantees correct reset output logic state down to VCC1 or VCC2 = 0.8 V, verified across –40°C to +125°C. Below 0.8 V, reset behavior is not specified; for sub-0.8 V operation, external pulldown resistors on RST are recommended per Maxim Application Note 5321.
Is MAX6728KATGD3 pin-compatible with other devices in the MAX67xxA family?
MAX6728KATGD3 uses the 8-pin SOT23-8 package and shares identical pinout with MAX6725A–MAX6729A and MAX6797A variants. However, pin compatibility does not imply functional equivalence - features like WDI (present on MAX6729A) or RST2 (on MAX6727A) differ across variants despite shared footprint.
MAX6728KATGD3 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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.11V, 3.075V, 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
MAX6728KATGD3 FAQ
1.How can I place an order for MAX6728KATGD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6728KATGD3 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 MAX6728KATGD3 reliable?
The price and inventory of MAX6728KATGD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6728KATGD3 is usually 5 days.
3.What payment methods are accepted for MAX6728KATGD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6728KATGD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6728KATGD3?
MAX6728KATGD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6728KATGD3 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 MAX6728KATGD3?
For technical support, including MAX6728KATGD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6728KATGD3 requirements.
6.How does Aetrix verify that MAX6728KATGD3 is sourced from the original manufacturer or authorized distributors?
All MAX6728KATGD3 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 MAX6728KATGD3 meets industry standards.
7.What is the process for return or replacement of MAX6728KATGD3?
All MAX6728KATGD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6728KATGD3, 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 MAX6728KATGD3 part is unused and in its original packaging.
Return procedure for MAX6728KATGD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6728KATGD3 Tags
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