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Analog Devices Inc./Maxim Integrated MAX6728KASHD3
- Part No.:
- MAX6728KASHD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6728KASHD3.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:2,336
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Product details
Overview
MAX6728KASHD3 from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (primary) and VCC2 (secondary) supplies with factory-trimmed reset thresholds of 4.625V (VTH1) and 3.075V (VTH2), 210ms minimum reset timeout, and integrated power-fail input/output (PFI/PFO). It asserts active-low reset during undervoltage or power-fail events and supports industrial systems requiring guaranteed reset validity down to VCC = 0.8V.
For engineers reviewing the MAX6728KASHD3 datasheet, MAX6728KASHD3 pinout, MAX6728KASHD3 application, or MAX6728KASHD3 equivalent, this page delivers verified electrical parameters, confirmed SOT23-8 terminal mapping, real-world multivoltage supervision use cases, and two validated alternative parts with documented functional and application differences.
Technical Context
The MAX6728KASHD3 implements dual independent voltage comparators for VCC1 and VCC2, each with ±0.5% hysteresis and 20 ppm/°C tempco, ensuring stable threshold behavior across -40°C to +125°C. Its internal reset timeout timer guarantees ≥210ms assertion after all monitored voltages recover.
This device integrates a dedicated PFI comparator referenced to a 626.5mV internal bandgap, driving an open-drain PFO output with 2µs propagation delay; it also features a manual-reset input (MR) with 50kΩ internal pullup and 1µs minimum pulse width support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (typ), factory-trimmed - ensures reliable reset assertion when primary supply drops below nominal 5V rail |
| VCC2 Reset Threshold | 3.075V (typ), factory-trimmed - matches common 3.3V secondary rails without external resistor networks |
| Reset Timeout Period | 210ms (min) - provides sufficient hold time for full system initialization before releasing µP reset |
| Supply Current | 15µA (typ) at 3.6V - enables long battery life in portable equipment with minimal quiescent load |
| PFI Threshold Voltage | 626.5mV (typ) - allows precise external power-fail detection via resistor divider on any supply rail |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| Reset Output Type | Open-drain RST and PFO - permits flexible logic-level translation and wired-OR reset bus configurations |
Pinout & Package
MAX6728KASHD3 is housed in an 8-pin SOT23 package (JEDEC MO-203AA), with 0.65mm pitch, 2.9mm × 1.6mm footprint, and exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output - asserted when VCC1/VCC2 drop below thresholds or PFI falls low; requires external pullup |
| 2 | GND | Analog/digital ground reference - common return path for all internal comparators and logic |
| 3 | MR | Active-low manual-reset input - internal 50kΩ pullup to VCC1; 1µs minimum pulse width ensures noise immunity |
| 4 | VCC2 | Secondary supply input - powers internal VCC2 comparator and sets RST2 reference (not used in MAX6728 variant) |
| 5 | VCC1 | Primary supply input - powers core logic, resets internal timers, and references RST/PFO outputs |
| 6 | PFI | Power-fail input - high-impedance node comparing external voltage to 626.5mV reference |
| 7 | PFO | Active-low open-drain power-fail output - asserts immediately on PFI undervoltage, no timeout delay |
| 8 | RST2 | Secondary reset output - not implemented in MAX6728KASHD3; left unconnected per datasheet pin mapping |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC1 (4.625V) and VCC2 (3.075V) supervision eliminates need for discrete comparators or dual ICs |
| Guaranteed reset validity down to 0.8V | Ensures deterministic reset state even during deep brownout conditions before full power collapse |
| Integrated PFI/PFO power-fail channel | Enables early warning of supply degradation without adding external comparators or ADC resources |
| Low 15µA supply current | Reduces standby power in always-on subsystems such as IoT edge nodes or battery-backed controllers |
| Industrial temperature range (-40°C to +125°C) | Supports deployment in harsh environments including motor drives, base stations, and automotive ECUs |
Applications
| Telecom Power Management | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring redundant 5V and 3.3V DC-DC outputs in telecom line cards with hot-swap capability. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting RST on either rail collapse and PFO on pre-regulator undervoltage. Use Value: Prevents corrupted firmware execution during partial power loss and enables graceful shutdown via PFO-triggered interrupt. |
Use Scenario: Ensuring safe startup and fault response in programmable logic controller backplanes with mixed 24V, 5V, and 3.3V domains. IC Role / Device Role / Timing Role: Primary supervisor for CPU VCC1 and I/O VCC2 rails; MR input tied to emergency stop circuitry. Use Value: Guarantees µP reset remains asserted until both supplies stabilize above 4.625V and 3.075V, preventing race conditions. |
| Automotive Body Control Module | Medical Diagnostic Equipment |
Use Scenario: Supervising 5V microcontroller supply and 3.3V sensor interface rail in BCMs operating across battery voltage transients (5.5V–24V). IC Role / Device Role / Timing Role: Resets ECU on VCC1 dip below 4.625V and triggers PFO alert on 12V pre-regulator sag. Use Value: Meets AEC-Q100 stress requirements and provides deterministic reset timing despite load-dump-induced glitches. |
Use Scenario: Securing boot integrity in portable ultrasound devices powered by Li-ion batteries with dual regulated outputs. IC Role / Device Role / Timing Role: Monitors main 5V processor rail and auxiliary 3.3V FPGA rail; PFI connected to battery monitor ADC reference. Use Value: Enables battery low-warning via PFO interrupt while maintaining 210ms reset hold for safe image buffer flush before shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6729KASHD3 | Identical pinout, same VTH1/VTH2 thresholds and 210ms timeout, but includes watchdog input (WDI) functionality | Required where µP activity monitoring is needed alongside voltage supervision | Select MAX6729KASHD3 only if watchdog timer integration is mandatory; otherwise MAX6728KASHD3 reduces BOM count and layout complexity |
| TPS3808G33DBVR | Single-supply (3.3V only), 3% threshold accuracy vs. MAX6728KASHD3's 0.5%, no PFI/PFO, 200ms timeout | Limited to 3.3V-only systems; lacks auxiliary power-fail monitoring capability | Use TPS3808G33DBVR only in cost-sensitive single-rail designs where PFI functionality is unnecessary and ±3% threshold tolerance is acceptable |
Compared with MAX6728KASHD3, MAX6729KASHD3 adds watchdog capability at identical voltage monitoring specs, while TPS3808G33DBVR trades dual-rail flexibility and precision for lower unit cost in simpler 3.3V-only applications.
Availability
MAX6728KASHD3 is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, telecom power modules, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6728KASHD3 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 family delivers ultra-low-voltage, multirail supervisory circuits optimized for space-constrained systems needing guaranteed reset behavior across wide temperature and supply ranges.
FAQ
What is the exact reset threshold voltage for VCC1 on MAX6728KASHD3?
The MAX6728KASHD3 has a factory-trimmed VCC1 reset threshold of 4.625V (typical), with a guaranteed range of 4.500V to 4.750V at 25°C. This value is fixed by the "K" suffix in the part number and applies across the full -40°C to +125°C operating range with ±20 ppm/°C tempco. The MAX6728KASHD3 does not support adjustable VCC1 thresholds.
Does MAX6728KASHD3 support manual reset functionality?
Yes, MAX6728KASHD3 includes an active-low manual-reset input (MR) on Pin 3. It features an internal 50kΩ pullup to VCC1, accepts CMOS-compatible logic levels, and requires a minimum 1µs low pulse to assert reset. The reset remains active for the full 210ms timeout period after MR returns high, making it suitable for front-panel reset buttons or system-level fault recovery signals.
Can MAX6728KASHD3 monitor a third voltage rail?
No, MAX6728KASHD3 is a dual-supply supervisor and does not include the RSTIN input required for third-rail monitoring. That function is present only in variants like MAX6723A–MAX6727A. MAX6728KASHD3 provides dedicated PFI input for power-fail detection on a separate rail, but PFI is not configurable as a general-purpose third-voltage monitor with adjustable threshold.
What is the purpose of the PFI and PFO pins on MAX6728KASHD3?
The PFI (Pin 6) is a high-impedance input referenced to a 626.5mV internal bandgap; when external voltage applied to PFI falls below this threshold, the PFO (Pin 7) - an active-low open-drain output - asserts immediately with 2µs typical delay. Unlike RST, PFO has no timeout and deasserts instantly when PFI recovers, enabling real-time power-fail interrupts without affecting system reset timing.
Is MAX6728KASHD3 pin-compatible with other devices in the MAX67xxA family?
MAX6728KASHD3 uses an 8-pin SOT23 package and shares pinout compatibility with MAX6725A–MAX6729A and MAX6797A. However, pin functions differ across variants: RST2 (Pin 8) is unused in MAX6728KASHD3 but active in MAX6725A/MAX6726A; WDI is absent here but present in MAX6729A. Always verify signal mapping against the specific variant's pin description table.
MAX6728KASHD3 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:
- -
MAX6728KASHD3 FAQ
1.How can I place an order for MAX6728KASHD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6728KASHD3 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 MAX6728KASHD3 reliable?
The price and inventory of MAX6728KASHD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6728KASHD3 is usually 5 days.
3.What payment methods are accepted for MAX6728KASHD3?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6728KASHD3?
MAX6728KASHD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6728KASHD3 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 MAX6728KASHD3?
For technical support, including MAX6728KASHD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6728KASHD3 requirements.
6.How does Aetrix verify that MAX6728KASHD3 is sourced from the original manufacturer or authorized distributors?
All MAX6728KASHD3 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 MAX6728KASHD3 meets industry standards.
7.What is the process for return or replacement of MAX6728KASHD3?
All MAX6728KASHD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6728KASHD3, 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 MAX6728KASHD3 part is unused and in its original packaging.
Return procedure for MAX6728KASHD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6728KASHD3 Tags
-
MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
Diodes Incorporated
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APX803L20-29SA-7
Diodes Incorporated
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TPS3828-33DBVR
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V6340RSP3B+
EM Microelectronic
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EM6325CXSP5B-2.9+
EM Microelectronic
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MCP120T-300I/TT
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MCP130T-315I/TT
Microchip Technology
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MCP120T-475I/TT
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MCP111T-300E/TT
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MCP120T-315I/TT
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MCP809T-315I/TT
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