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Analog Devices Inc./Maxim Integrated MAX6728KAZGD3+
- Part No.:
- MAX6728KAZGD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6728KAZGD3+.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
- Shipping:
Inventory:803
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Product details
Overview
MAX6728KAZGD3+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (4.625V threshold), VCC2 (3.075V threshold), and PFI (626.5mV internal reference) with 280ms reset timeout, push-pull RST and open-drain PFO outputs, and guaranteed reset validity down to VCC1 or VCC2 = 0.8V - used in telecom power sequencing and industrial multivoltage systems.
For engineers reviewing the MAX6728KAZGD3+ datasheet, MAX6728KAZGD3+ pinout, MAX6728KAZGD3+ application, or MAX6728KAZGD3+ equivalent, key selection factors include its triple-supply monitoring capability, integrated power-fail comparator with PFO output, 280ms factory-set reset timeout, push-pull RST logic compatibility with bidirectional µP reset pins, and operation across –40°C to +85°C.
Technical Context
The MAX6728KAZGD3+ implements dual independent voltage comparators for VCC1 and VCC2 supervision plus a dedicated power-fail comparator tied to PFI/PFO, all sharing a common reset timeout timer. Its architecture guarantees valid reset assertion even when either supply drops to 0.8V, enabling robust brownout detection in battery-backed or dynamically scaled systems.
It integrates a manual reset input (MR) with 50kΩ internal pullup and glitch rejection, supports external resistor-divider configuration for PFI threshold tuning, and delivers 280ms minimum reset pulse width after any fault condition clears - ensuring sufficient time for µP initialization before release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-trimmed, ±125mV tolerance) - sets primary supply undervoltage trip point for 5V rail monitoring |
| VCC2 Threshold | 3.075V (factory-trimmed, ±75mV tolerance) - sets secondary supply trip for 3.3V rail monitoring |
| PFI Threshold | 626.5mV (internal reference, ±15.5mV) - enables precise external power-fail detection via resistor divider |
| Reset Timeout | 280ms (min) - ensures µP reset hold duration meets boot-time requirements of ARM Cortex-M and similar processors |
| Supply Current | 14µA (typ at 3.6V) - enables use in always-on subsystems without compromising battery life |
| Operating Temp | –40°C to +85°C - qualified for industrial and telecom equipment operating in uncontrolled environments |
| Package | 8-pin SOT23 - surface-mount footprint compatible with high-density PCB layouts and automated assembly |
Pinout & Package
MAX6728KAZGD3+ uses an 8-pin SOT23 package (JEDEC MO-203AA), with exposed pad for thermal performance and mechanical stability in compact designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserts low on any fault and holds for 280ms after recovery |
| 2 | GND | System ground reference for all internal comparators and output drivers |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; 1µs minimum pulse width required |
| 4 | PFO | Active-low open-drain power-fail output; asserts immediately when PFI falls below 626.5mV, no timeout delay |
| 5 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal VCC2 comparator and RST2 logic (not used in MAX6728) |
| 6 | VCC1 | Primary supply input (1.8V–5.0V range); powers core logic, VCC1 comparator, and RST output driver |
| 7 | PFI | Power-fail monitor input; high-impedance node connected to external resistor divider for custom trip voltage |
| 8 | RSTIN | Unused in MAX6728 (reserved for adjustable third-voltage monitoring in other variants like MAX6723–MAX6727) |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring | Simultaneous VCC1, VCC2, and PFI supervision with independent thresholds - eliminates need for discrete comparators in multirail systems |
| Guaranteed reset validity to 0.8V | Ensures deterministic reset behavior during deep brownout conditions where VCC1 or VCC2 collapses below 1.0V |
| Integrated power-fail comparator | Enables early warning of supply degradation via PFO output, supporting graceful shutdown before system crash |
| Push-pull RST + open-drain PFO | Allows direct interface to µP reset pins without external pullup while providing flexible interrupt signaling via PFO |
| 280ms factory-set timeout | Matches typical bootloader execution windows for embedded processors, reducing BOM count vs. adjustable-timer alternatives |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Sequencing startup of FPGA, DSP, and analog front-end rails in base station transceivers. IC Role / Device Role / Timing Role: Supervises 5V (VCC1), 3.3V (VCC2), and -48V-derived bias rail (via PFI divider) to enforce safe power-up order. Use Value: Prevents latch-up by holding reset until all rails stabilize above their thresholds and maintains 280ms hold time for FPGA configuration. |
Use Scenario: Monitoring isolated 24V DC input, 5V logic, and 3.3V MCU supply in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Detects undervoltage on field-side 24V rail (PFI) and logic rails (VCC1/VCC2) to trigger controlled I/O disable before fault propagation. Use Value: Enables fail-safe shutdown within 280ms, preserving data integrity during brownout events in factory automation environments. |
| Medical Diagnostic Imaging | Network Edge Router |
Use Scenario: Ensuring stable power to X-ray detector ASICs and ADCs during high-current pulse sequences. IC Role / Device Role / Timing Role: Monitors 3.3V analog supply (VCC2), 1.8V digital core (VCC1), and auxiliary 12V bias (via PFI) to detect transient droop. Use Value: Guarantees reset assertion even if VCC2 sags to 0.8V during pulsed operation - critical for diagnostic accuracy compliance. |
Use Scenario: Managing power integrity across CPU, PHY, and PoE controller rails in enterprise switches. IC Role / Device Role / Timing Role: Uses PFI to monitor PoE input voltage margin and VCC1/VCC2 to supervise SoC supplies, asserting RST and PFO independently. Use Value: Delivers concurrent reset signaling and interrupt generation - enabling both hardware reset and firmware-level power-fail logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6729KAZGD3+ | Same triple-monitor architecture but features push-pull PFO instead of open-drain; identical VCC1/VCC2 thresholds and 280ms timeout | Required where PFO must drive active-high logic without external pullup; not suitable for wired-OR interrupt buses | Select MAX6729KAZGD3+ only if system requires push-pull PFO output level compatibility with downstream logic |
| TPS3808G33DBVR | Dual-supply monitor (no PFI/PFO), 3.3V fixed VDD threshold, 200ms timeout, SOT23-6 package; lacks third-voltage monitoring capability | Applicable only in dual-rail systems without power-fail warning needs; cannot replace PFI-based brownout detection | Choose TPS3808G33DBVR only for cost-sensitive dual-supply designs where PFI functionality is omitted |
Compared with MAX6728KAZGD3+, MAX6729KAZGD3+ offers identical supervision accuracy and timing but differs in PFO output structure, while TPS3808G33DBVR reduces feature set to dual monitoring only - making MAX6728KAZGD3+ the sole option supporting simultaneous triple-rail supervision with dedicated power-fail signaling.
Availability
MAX6728KAZGD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and medical imaging equipment requiring stable component supply with full lifecycle support and traceable sourcing.
Supply support for MAX6728KAZGD3+ 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 power management, sensing, and interface applications in industrial, automotive, and communications markets.
The MAX6715–MAX6729 family delivers ultra-low-voltage supervisory circuits optimized for multirail embedded systems requiring reliable reset generation, power-fail detection, and watchdog functionality in minimal SOT23 footprints.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6728KAZGD3+?
The MAX6728KAZGD3+ has a factory-trimmed VCC1 reset threshold of 4.625V, with a guaranteed tolerance of ±125mV over temperature. This value is encoded in the "Z" suffix per Maxim's Reset Voltage Threshold Suffix Guide and applies specifically to the MAX6728KAZGD3+ variant - not inferred from family-level data.
Does the MAX6728KAZGD3+ support monitoring a third supply voltage beyond VCC1 and VCC2?
Yes - the MAX6728KAZGD3+ uses its PFI pin to monitor a third voltage via an external resistor divider, with a 626.5mV internal reference. Unlike RSTIN-based variants (e.g., MAX6723), PFI provides dedicated power-fail detection with immediate PFO assertion and no reset timeout delay.
What is the function of the RSTIN pin on the MAX6728KAZGD3+?
The RSTIN pin on the MAX6728KAZGD3+ is unused and must be left floating or tied to GND/VCC1 per datasheet guidance. It is reserved for adjustable third-voltage monitoring in other family members (MAX6723–MAX6727) but not implemented in MAX6728KAZGD3+.
Can the MAX6728KAZGD3+ operate with VCC1 below 1.8V?
Yes - the MAX6728KAZGD3+ guarantees correct reset output logic state down to VCC1 = 0.8V, enabling use in ultra-low-voltage applications such as battery-powered sensors. However, VCC1 must remain ≥ 0.8V for reset validity; operation below this violates absolute maximum ratings.
How does the PFO output behave during a power-fail event on the MAX6728KAZGD3+?
When PFI falls below 626.5mV, the MAX6728KAZGD3+ asserts PFO low within 2µs (typical propagation delay) with no timeout period - unlike RST, which holds for 280ms. This allows immediate interrupt signaling to the µP for software-controlled shutdown before reset occurs.
MAX6728KAZGD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6728KAZGD3+ FAQ
1.How can I place an order for MAX6728KAZGD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6728KAZGD3+ 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 MAX6728KAZGD3+ reliable?
The price and inventory of MAX6728KAZGD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6728KAZGD3+ is usually 5 days.
3.What payment methods are accepted for MAX6728KAZGD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6728KAZGD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6728KAZGD3+?
MAX6728KAZGD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6728KAZGD3+ 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 MAX6728KAZGD3+?
For technical support, including MAX6728KAZGD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6728KAZGD3+ requirements.
6.How does Aetrix verify that MAX6728KAZGD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6728KAZGD3+ 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 MAX6728KAZGD3+ meets industry standards.
7.What is the process for return or replacement of MAX6728KAZGD3+?
All MAX6728KAZGD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6728KAZGD3+, 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 MAX6728KAZGD3+ part is unused and in its original packaging.
Return procedure for MAX6728KAZGD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6728KAZGD3+ Tags
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MIC826SYMT-TR
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