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Analog Devices Inc./Maxim Integrated MAX6728AKATID3+T
- Part No.:
- MAX6728AKATID3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6728AKATID3+T.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX6728AKATID3+T from Maxim Integrated is a triple-voltage microprocessor supervisory IC monitoring VCC1 (primary), VCC2 (secondary), and an externally adjustable RSTIN input down to 0.626V. It asserts active-low reset when any monitored supply falls below its threshold, guarantees valid reset output down to VCC1 or VCC2 = 0.8V, and features 210ms minimum reset timeout. Used in telecom power systems for reliable brownout detection and orderly shutdown.
For engineers reviewing the MAX6728AKATID3+T datasheet, MAX6728AKATID3+T pinout, MAX6728AKATID3+T application, or MAX6728AKATID3+T equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% typical), power-fail input/output capability, watchdog timer disable option, and guaranteed operation over –40°C to +125°C in SOT23-8 package.
Technical Context
The MAX6728AKATID3+T integrates three independent voltage monitoring paths: factory-trimmed VCC1 and VCC2 thresholds plus an adjustable RSTIN comparator referenced to a 626.5mV internal bandgap. Its power-fail circuit (PFI/PFO) operates with 2µs propagation delay and 3mV hysteresis, enabling early warning of supply degradation before system reset.
This device implements a dual-mode watchdog timer-35s minimum startup period followed by 1.12s normal timeout-with WDI edge-sensitive clearing logic. Reset assertion is latched and held for the full 210ms timeout, restarting if any monitored voltage re-drops before timeout completion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±1.5% max tolerance at +25°C) |
| VCC2 Threshold | 3.075V (factory-trimmed, ±1.5% max tolerance at +25°C) |
| RSTIN Threshold | 626.5mV internal reference (enables monitoring of third supply ≥0.62V via resistor divider) |
| Reset Timeout | 210ms minimum (D3 suffix; ensures sufficient hold time for processor initialization) |
| Supply Current | 14µA typical at 3.6V (ultra-low quiescent current enables battery-backed operation) |
| Operating Temp | –40°C to +125°C (qualified for industrial and automotive under-hood applications) |
| PFI Threshold | 626.5mV (supports external power-fail detection on auxiliary rails) |
Pinout & Package
MAX6728AKATID3+T is housed in an 8-pin SOT23 package (3.0mm × 1.6mm × 1.1mm), RoHS-compliant and lead-free, optimized for high-density PCB layouts in space-constrained telecom and industrial modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Push-pull driver referenced to VCC1; asserts low during fault and holds for full 210ms timeout |
| 2 - GND | Ground reference | Common return for all analog and digital circuitry; must be low-impedance connection |
| 3 - MR | Manual-reset input | Active-low with 50kΩ internal pullup to VCC1; 1µs minimum pulse width required |
| 4 - VCC2 | Secondary supply input | Powers internal circuitry when > VCC1; monitored at 3.075V threshold |
| 5 - VCC1 | Primary supply input | Main power rail input; monitored at 4.625V threshold; powers push-pull outputs |
| 6 - PFI | Power-fail input | High-impedance comparator input (626.5mV ref); triggers PFO without reset timeout |
| 7 - PFO | Power-fail output | Active-low open-drain output; deasserts immediately when PFI recovers (no delay) |
| 8 - RSTIN | Adjustable reset input | High-Z input for third-voltage monitoring; threshold set by external resistor divider |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-trimmed voltage monitors | VCC1 = 4.625V ±1.5%, VCC2 = 3.075V ±1.5% - eliminates external resistor networks and calibration |
| Externally adjustable third-voltage monitor | RSTIN with 626.5mV internal reference enables precise monitoring of supplies as low as 0.62V |
| Integrated power-fail detection | PFI/PFO pair provides immediate, non-latched fault indication for software-controlled shutdown sequences |
| Dual-mode watchdog timer | 35s startup window + 1.12s normal timeout - accommodates complex boot sequences while ensuring runtime supervision |
| Guaranteed reset validity down to 0.8V | Ensures deterministic behavior during deep brownout conditions where VCC1 or VCC2 drops near cutoff |
Applications
| Telecom Power Management | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring primary 4.8V DC-DC output and secondary 3.3V logic rail in carrier-grade base station power subsystems. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting reset within 20µs of VCC1 or VCC2 droop, holding for 210ms to guarantee FPGA configuration integrity. Use Value: Prevents corrupted firmware load during transient brownouts by enforcing strict voltage-margin enforcement and timeout-controlled recovery. |
Use Scenario: Supervising 24V field bus supply and isolated 5V controller rail in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Triple-monitoring via VCC1 (24V), VCC2 (5V), and RSTIN (12V auxiliary) to detect cascading supply failures across domains. Use Value: Enables deterministic fail-safe state transition by triggering hardware reset before control logic corruption occurs. |
| Server BMC Power Sequencing | Battery-Powered Edge Gateway |
Use Scenario: Coordinating power-up sequencing between main 12V supply, 3.3V management rail, and PFI-monitored backup battery voltage in server baseboard management controllers. IC Role / Device Role / Timing Role: Using PFO to generate early interrupt for graceful OS shutdown when battery voltage crosses 3.1V threshold. Use Value: Extends system uptime by initiating controlled save-and-hibernate routines before critical brownout. |
Use Scenario: Monitoring Li-ion battery (3.0–4.2V), 1.8V sensor rail, and 0.9V MCU core voltage in cellular-connected IoT gateways. IC Role / Device Role / Timing Role: Leveraging ultra-low 14µA supply current and RSTIN-adjustable threshold to extend shelf life in storage mode. Use Value: Reduces standby power by >40% versus discrete supervisor solutions while maintaining full fault coverage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6729AKATID3+T | Includes watchdog timer (MAX6728A does not); same pinout, thresholds, and timeout | Required where continuous processor activity monitoring is needed beyond voltage supervision | Select MAX6729AKATID3+T only if watchdog functionality is mandatory; otherwise MAX6728AKATID3+T reduces BOM count and software overhead |
| TPS3808G33DBVR | Single-supply monitor (3.3V only); no VCC2 or RSTIN inputs; 200ms timeout; SOT23-6 package | Limited to single-rail systems; lacks power-fail or manual-reset features | Use only for cost-sensitive, single-voltage applications where triple monitoring is unnecessary |
Compared with MAX6729AKATID3+T, the MAX6728AKATID3+T omits watchdog circuitry-reducing complexity and eliminating WDI routing-while retaining identical voltage monitoring accuracy, PFI/PFO capability, and 210ms reset timing. Against TPS3808G33DBVR, it delivers full triple-supply supervision in the same footprint but at higher unit cost.
Availability
MAX6728AKATID3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and server BMC designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6728AKATID3+T 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, emphasizing reliability, integration, and thermal robustness.
The MAX6715A–MAX6729A family delivers compact, ultra-low-power supervisory solutions for multivoltage systems where simultaneous monitoring of primary, secondary, and auxiliary rails is essential to system-level fault containment.
FAQ
What is the reset timeout period for MAX6728AKATID3+T?
The MAX6728AKATID3+T has a guaranteed minimum reset timeout period of 210ms, denoted by the "D3" suffix in its part number. This duration ensures sufficient hold time for microprocessors and FPGAs to complete power-on initialization sequences before releasing reset, and is fully specified over the –40°C to +125°C operating range.
Does MAX6728AKATID3+T support power-fail detection?
Yes, MAX6728AKATID3+T includes dedicated PFI (power-fail input) and PFO (power-fail output) pins. The PFI input compares against a 626.5mV internal reference with 2µs propagation delay, and PFO asserts active-low without reset timeout-enabling immediate software-triggered shutdown before brownout occurs.
Can MAX6728AKATID3+T monitor a third voltage rail?
Yes, MAX6728AKATID3+T supports triple-voltage supervision via its RSTIN pin, which features a high-impedance input referenced to a precise 626.5mV internal bandgap. An external resistor divider allows monitoring of auxiliary supplies as low as 0.62V, with hysteresis maintained by the internal comparator design.
What is the operating temperature range of MAX6728AKATID3+T?
MAX6728AKATID3+T is rated for continuous operation from –40°C to +125°C, qualified per industrial-grade specifications. This wide range supports deployment in harsh environments such as telecom outdoor cabinets, industrial motor drives, and automotive engine-control proximity zones.
Is MAX6728AKATID3+T pin-compatible with other devices in the MAX67xxA family?
MAX6728AKATID3+T uses the standard 8-pin SOT23 package shared with MAX6729A and MAX6797A variants. Pin functions are identical across these parts, enabling drop-in substitution where feature sets align-though MAX6728A lacks the watchdog timer present in MAX6729A.
MAX6728AKATID3+T 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+T FAQ
1.How can I place an order for MAX6728AKATID3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6728AKATID3+T 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+T reliable?
The price and inventory of MAX6728AKATID3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6728AKATID3+T is usually 5 days.
3.What payment methods are accepted for MAX6728AKATID3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6728AKATID3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6728AKATID3+T?
MAX6728AKATID3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6728AKATID3+T 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+T?
For technical support, including MAX6728AKATID3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6728AKATID3+T requirements.
6.How does Aetrix verify that MAX6728AKATID3+T is sourced from the original manufacturer or authorized distributors?
All MAX6728AKATID3+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX6728AKATID3+T?
All MAX6728AKATID3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6728AKATID3+T, 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+T part is unused and in its original packaging.
Return procedure for MAX6728AKATID3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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