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Analog Devices Inc./Maxim Integrated MAX6728AKATID3+
- Part No.:
- MAX6728AKATID3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6728AKATID3+.pdf
- Description:
- TRIPLE, ULTRA-LOW VOLTAGE, MICRO
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6728AKATID3+ 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 push-pull 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 requiring reliable brownout detection and orderly shutdown.
For engineers reviewing the MAX6728AKATID3+ datasheet, MAX6728AKATID3+ pinout, MAX6728AKATID3+ application, or MAX6728AKATID3+ equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed triple-supply monitoring capability (via PFI), guaranteed reset validity down to VCC1/VCC2 = 0.8 V, and real-world substitution guidance - all aligned to Maxim's official MAX6728A datasheet Rev 5 (10/17).
Technical Context
The MAX6728AKATID3+ integrates dual independent voltage comparators for VCC1 and VCC2, a dedicated power-fail comparator (PFI → PFO), manual-reset logic with internal 50 kΩ pullup to VCC1, and push-pull RST output referenced to VCC1. Its reset assertion is synchronized across all monitored inputs, with hysteresis (0.5% of VTH) and immunity to sub-20 µs VCC transients.
It supports system-level reliability features including guaranteed reset assertion at VCC1 or VCC2 ≥ 0.8 V, low 14 µA typical supply current at 3.6 V, and 2 µs PFI-to-PFO propagation delay. The device lacks watchdog or RSTIN functionality - confirmed by its suffix "D3" (140 ms timeout) and absence of WDI/RSTIN pins in its 8-pin SOT23 pinout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625 V (factory-trimmed, ±125 mV tolerance); ensures reliable reset assertion during 5 V rail brownout |
| VCC2 Reset Threshold | 3.075 V (factory-trimmed, ±75 mV tolerance); monitors 3.3 V auxiliary rail with guaranteed operation down to 0.8 V |
| Reset Timeout Period | 140 ms (minimum); provides sufficient hold time for processor initialization and peripheral stabilization |
| Supply Current | 14 µA typical at 3.6 V; enables ultra-low-power operation in battery-backed or energy-sensitive systems |
| Operating Temperature | -40°C to +125°C; qualified for under-hood automotive, industrial control, and telecom base station environments |
| PFI Input Threshold | 626.5 mV (±15.5 mV); allows precise external resistor-divider setup for custom power-fail detection on non-VCC rails |
| RST Output Type | Push-pull, active-low, referenced to VCC1; eliminates need for external pullup and ensures clean logic-level reset signaling |
Pinout & Package
MAX6728AKATID3+ is housed in an 8-pin SOT23 package (JEDEC MO-203AA), with 0.65 mm pitch, 2.9 mm × 1.6 mm footprint, and exposed thermal pad. Pin 1 marked via dot; recommended reflow profile per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts low on VCC1/VCC2 undervoltage or MR low |
| 2 | GND | Analog/digital ground reference; must be connected to system ground plane for stable threshold accuracy |
| 3 | MR | Active-low manual-reset input with internal 50 kΩ pullup to VCC1; debounced by design, no external RC needed |
| 4 | VCC2 | Secondary supply input (0.8–5.5 V); powers internal VCC2 comparator and sets RST2 reference if used |
| 5 | VCC1 | Primary supply input (0.8–5.5 V); powers core logic, references RST/PFO outputs, and pulls up MR |
| 6 | PFI | Power-fail comparator input; high-impedance node (±100 nA) for external resistor-divider monitoring of third rail |
| 7 | PFO | Active-low push-pull power-fail output referenced to VCC1; asserts when PFI falls below 626.5 mV, no timeout |
| 8 | RST2 | Active-low push-pull secondary reset output referenced to VCC2; mirrors RST behavior but driven from VCC2 domain |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC1 (4.625 V) and VCC2 (3.075 V) supervision with separate comparators and hysteresis |
| Power-fail detection with dedicated I/O | PFI input and PFO output enable early warning of input rail collapse (e.g., battery or DC-DC pre-regulator) |
| Guaranteed reset validity at low VCC | Functional reset assertion guaranteed even when VCC1 or VCC2 drops to 0.8 V - critical for graceful shutdown |
| Push-pull RST and RST2 outputs | No external pullup required; RST referenced to VCC1, RST2 referenced to VCC2 - simplifies interface to mixed-rail systems |
| Immunity to short VCC transients | Withstands ≤20 µs negative-going glitches without spurious reset - reduces false triggers in noisy power environments |
Applications
| Telecom Power Management | Industrial PLC Control |
|---|---|
Use Scenario: Monitoring primary 5 V and secondary 3.3 V rails in LTE base station power modules, with PFI tied to -48 V DC-DC converter feedback node. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting RST on brownout and PFO on pre-regulator failure to trigger firmware-controlled safe shutdown. Use Value: Prevents data corruption during AC mains interruption by enabling controlled FPGA configuration reload before full power loss. |
Use Scenario: Supervising 24 V DC input and isolated 5 V logic rail in programmable logic controller backplane, with MR connected to front-panel reset button. IC Role / Device Role / Timing Role: Ensures deterministic reset timing (140 ms min) after power cycle or operator-initiated reset, synchronizing CPU and I/O module startup. Use Value: Eliminates race conditions between CPU boot and fieldbus transceiver initialization, reducing commissioning failures by >90%. |
| Automotive Infotainment | Network Equipment |
Use Scenario: Monitoring 12 V battery-derived 5 V main rail and 3.3 V MCU core rail in head unit ECU, with PFI monitoring backup battery voltage. IC Role / Device Role / Timing Role: Asserts RST on ignition-off brownout and PFO on backup battery depletion to save last-known GPS position before shutdown. Use Value: Enables AEC-Q100-compliant fail-safe behavior without adding discrete comparators or timers - saving 32 mm² PCB area. |
Use Scenario: Dual-rail supervision in 10G Ethernet switch line card, where VCC1 = 3.3 V PHY supply and VCC2 = 1.2 V SerDes supply, with PFO feeding FPGA interrupt pin. IC Role / Device Role / Timing Role: Provides hardware-enforced reset coordination across multiple voltage domains and initiates link renegotiation on PFO event. Use Value: Reduces link recovery time from 5 s (software-only) to <150 ms by triggering immediate PHY retraining on power anomaly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6723AKATID3+ | Includes RSTIN input for third-voltage monitoring (0.626 V reference); same 140 ms timeout, 8-pin SOT23, identical VTH1/VTH2 | Required when monitoring three supplies (e.g., VCC1, VCC2, and analog sensor rail); adds external resistor divider complexity | Select MAX6723AKATID3+ only if third-supply monitoring is mandatory; otherwise MAX6728AKATID3+ offers lower BOM count and reduced layout risk |
| TPS3808G33DBVR | Single-supply supervisor (3.3 V fixed threshold); 200 ms timeout; SOT23-6; no PFI/PFO or RST2; 2.5 µA quiescent current | Limited to single-rail monitoring; requires external circuitry for dual-rail coordination or power-fail signaling | Choose TPS3808G33DBVR only for cost-sensitive, single-rail designs where PFI/PFO and dual-RST are unnecessary |
Compared with MAX6723AKATID3+, MAX6728AKATID3+ removes RSTIN to reduce pin count and simplify layout, while retaining identical dual-threshold accuracy and PFI/PFO functionality; versus TPS3808G33DBVR, it delivers integrated dual-rail coordination and hardware power-fail signaling - eliminating 3–5 discrete components in typical implementations.
Availability
MAX6728AKATID3+ is available at Aetrix Electronics and suitable for telecom power management, industrial PLC control, automotive infotainment, and network equipment requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for MAX6728AKATID3+ 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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX67xxA family delivers ultra-low-voltage, multi-rail supervisory circuits optimized for systems requiring guaranteed reset validity at sub-1 V supply levels and robust operation across -40°C to +125°C.
FAQ
What is the exact reset timeout period for MAX6728AKATID3+?
The MAX6728AKATID3+ has a minimum reset timeout period of 140 ms, as defined by the "D3" suffix in its part number. This value is guaranteed over the full -40°C to +125°C operating temperature range and is independent of supply voltage within 0.8 V to 5.5 V. The actual timeout may vary slightly due to process variation but remains ≥140 ms under all specified conditions. This timing ensures sufficient hold duration for modern microprocessors and FPGAs to complete boot sequence initialization.
Does MAX6728AKATID3+ support watchdog timer functionality?
No, MAX6728AKATID3+ does not include a watchdog timer. Its part number suffix and functional description confirm it belongs to the non-watchdog variant group within the MAX6728A series. Devices with watchdog capability carry "W" or "WD" in their ordering code (e.g., MAX6729A). The MAX6728AKATID3+ pinout omits WDI, and its internal block diagram shows no watchdog timer circuitry - making it suitable for applications where software-based supervision suffices.
Can MAX6728AKATID3+ monitor a negative supply voltage?
Yes, MAX6728AKATID3+ can monitor a negative supply using its PFI input with an appropriate resistor divider, as documented in Figure 3 of the datasheet. When configured for negative rail monitoring, PFO asserts high upon negative supply collapse (opposite polarity behavior). Accuracy depends on PFI threshold tolerance (±15.5 mV), resistor matching, and VCC stability. The device itself does not require negative supply - only the external divider network referenced to GND.
What is the function of the RST2 pin on MAX6728AKATID3+?
RST2 on MAX6728AKATID3+ is an active-low push-pull reset output referenced to VCC2, providing a second reset signal synchronized with the VCC2 domain. It asserts simultaneously with RST during VCC1/VCC2 undervoltage or MR activation, but its high-state voltage level follows VCC2 (not VCC1). This enables direct interfacing with peripherals powered by VCC2, avoiding level-shifting components and ensuring timing coherence across dual-rail subsystems.
Is MAX6728AKATID3+ RoHS-compliant and lead-free?
Yes, MAX6728AKATID3+ is RoHS-compliant and lead-free, as indicated by the "+" suffix in its part number per Maxim's packaging nomenclature. It meets EU Directive 2011/65/EU and is compatible with standard Pb-free reflow profiles (J-STD-020). The package uses matte tin plating over copper leadframe, with no exemptions claimed. Full compliance documentation, including material declarations and test reports, is available through Analog Devices' product change notifications.
MAX6728AKATID3+ 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:
- 2
- Voltage - Threshold:
- 1.388V, 3.075V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6728AKATID3+ FAQ
1.How can I place an order for MAX6728AKATID3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6728AKATID3+ 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 MAX6728AKATID3+ reliable?
The price and inventory of MAX6728AKATID3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6728AKATID3+ is usually 5 days.
3.What payment methods are accepted for MAX6728AKATID3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6728AKATID3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6728AKATID3+?
MAX6728AKATID3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6728AKATID3+ 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 MAX6728AKATID3+?
For technical support, including MAX6728AKATID3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6728AKATID3+ requirements.
6.How does Aetrix verify that MAX6728AKATID3+ is sourced from the original manufacturer or authorized distributors?
All MAX6728AKATID3+ 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 MAX6728AKATID3+ meets industry standards.
7.What is the process for return or replacement of MAX6728AKATID3+?
All MAX6728AKATID3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6728AKATID3+, 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 MAX6728AKATID3+ part is unused and in its original packaging.
Return procedure for MAX6728AKATID3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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