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Analog Devices Inc./Maxim Integrated MAX6728KASVD3+T
- Part No.:
- MAX6728KASVD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6728KASVD3+T.pdf
- Description:
- MAX6728KASVD3+T
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Product details
Overview
MAX6728KASVD3+T from Maxim Integrated is a triple-voltage microprocessor supervisory IC monitoring VCC1 (primary), VCC2 (secondary), and PFI (power-fail input) with factory-trimmed thresholds of 3.075V (VTH1), 2.925V (VTH2), and 626.5mV (VPFI); reset timeout of 210ms (min); push-pull active-low RST and open-drain active-low PFO outputs; operates from -40°C to +85°C in 8-pin SOT23 package for multivoltage embedded power sequencing.
For engineers reviewing the MAX6728KASVD3+T datasheet, MAX6728KASVD3+T pinout, MAX6728KASVD3+T application, or MAX6728KASVD3+T equivalent, key selection criteria include guaranteed reset validity down to VCC1/VCC2 = 0.8V, immunity to short VCC transients, 14µA typical supply current at 3.6V, and integrated power-fail detection with 2µs PFI-to-PFO delay - critical for orderly shutdown in telecom and industrial systems.
Technical Context
The MAX6728KASVD3+T implements dual independent voltage comparators for VCC1 and VCC2 plus a dedicated power-fail comparator referenced to a 626.5mV internal bandgap, enabling simultaneous monitoring of three distinct supply rails. Its reset logic asserts RST low if any monitored voltage falls below its threshold and holds it for a fixed 210ms minimum timeout after all voltages recover.
It integrates a manual reset input (MR) with 50kΩ internal pullup and supports power-fail warning via PFI/PFO without requiring external timing components. The device guarantees correct reset output state when either VCC1 or VCC2 remains ≥0.8V, ensuring robust brownout detection during partial supply collapse.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 3.075V (typ), factory-trimmed ±1.5% - ensures precise primary supply monitoring for 3.3V systems |
| VCC2 Threshold | 2.925V (typ), factory-trimmed ±1.5% - enables accurate secondary rail supervision (e.g., I/O supply) |
| PFI Threshold | 626.5mV (typ), ±2.5mV hysteresis - provides stable power-fail detection for preregulated inputs or batteries |
| Reset Timeout | 210ms (min), D3 suffix - guarantees sufficient processor hold time for full system initialization |
| Supply Current | 14µA (typ) at 3.6V - minimizes quiescent load in battery-operated or low-power applications |
| Operating Temp | -40°C to +85°C - qualified for industrial and telecom equipment environments |
| Package | 8-pin SOT23 - compact footprint compatible with high-density PCB layouts |
Pinout & Package
MAX6728KASVD3+T is housed in an 8-pin SOT23 package (3.0mm × 1.6mm × 1.1mm body, 0.65mm pitch), optimized for space-constrained designs and reflow-compatible assembly.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; drives low on fault and holds for 210ms timeout |
| 2 | GND | System ground reference for all internal comparators and logic |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; forces reset when pulled low |
| 4 | PFO | Active-low open-drain power-fail output; asserts immediately when PFI < 626.5mV (no timeout) |
| 5 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal circuitry and sets VCC2 threshold reference |
| 6 | VCC1 | Primary supply input (1.8V–5.0V range); powers core logic and sets VCC1 threshold reference |
| 7 | PFI | Power-fail monitor input; high-impedance node comparing external voltage to 626.5mV internal reference |
| 8 | NC | No connect - internally unconnected; must be left floating or tied to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage monitoring | Simultaneous supervision of VCC1, VCC2, and PFI with independent thresholds eliminates need for multiple discrete supervisors |
| Guaranteed reset validity | Operates correctly with VCC1 or VCC2 ≥ 0.8V - ensures reliable reset assertion during deep brownout conditions |
| Power-fail interrupt capability | PFO asserts instantly on PFI undervoltage (2µs delay), enabling software-triggered graceful shutdown before full power loss |
| Low-glitch susceptibility | Immune to VCC transients ≤20µs (at 100mV overdrive) - prevents spurious resets in noisy power environments |
| Minimal quiescent consumption | 14µA typical ICC at 3.6V - extends battery life in portable equipment without compromising supervision fidelity |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring primary 3.3V backplane rail, secondary 2.5V FPGA I/O supply, and −12V bias supply via PFI resistor divider in carrier-grade line cards. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting RST to halt processor execution and PFO to trigger firmware-initiated power-down sequence upon early power-fail detection. Use Value: Prevents data corruption during AC mains interruption by initiating controlled shutdown within 2µs of PFI threshold breach while maintaining valid reset down to 0.8V on surviving rails. | Use Scenario: Supervising 24V DC input, isolated 5V logic supply, and 3.3V microcontroller core in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Fault detector generating synchronized reset pulse (210ms) across all subsystems and providing immediate PFO interrupt for analog input sampling freeze. Use Value: Ensures deterministic recovery after brownout events and enables real-time response to input voltage sag via PFO edge detection - critical for SIL-2 functional safety compliance. |
| Network Switch ASIC Power Management | Battery-Powered Medical Monitor |
Use Scenario: Coordinating startup sequencing of 1.2V ASIC core, 1.8V SerDes, and 3.3V PHY supplies in 10G Ethernet switches using VCC1/VCC2/PFI monitoring. IC Role / Device Role / Timing Role: System integrity guardian enforcing strict voltage order and timing windows; RST held until all rails stabilize above thresholds for ≥210ms. Use Value: Eliminates ASIC configuration errors caused by premature release of reset, reducing field failure rate in high-reliability infrastructure deployments. | Use Scenario: Monitoring lithium-ion battery voltage (via PFI divider), regulated 3.3V MCU supply (VCC1), and 1.8V sensor interface rail (VCC2) in portable ECG devices. IC Role / Device Role / Timing Role: Low-power supervisor enabling battery runtime extension through 14µA quiescent current and early low-battery warning via PFO interrupt. Use Value: Provides 210ms reset hold time for safe data save to nonvolatile memory and immediate PFO alert at 3.0V battery threshold - meeting IEC 62304 power-loss requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6729KA3D3+T | Push-pull PFO output (vs. open-drain on MAX6728KASVD3+T); identical VTH1/VTH2/VPFI and 210ms timeout | Eliminates need for external PFO pullup resistor; better suited for driving CMOS inputs directly | Select MAX6729KA3D3+T when PFO must drive logic without external components; otherwise MAX6728KASVD3+T offers lower BOM count for open-drain interfacing |
| TPS3808G33DBVR | Dual-supply monitor only (no PFI); 3.3V fixed VDD threshold; 200ms timeout; 2.5µA IQ | Lacks third-voltage monitoring capability; requires separate PFI circuit for power-fail detection | Choose TPS3808G33DBVR only if triple-monitoring is unnecessary and ultra-low IQ (<3µA) is prioritized over PFI integration |
Compared with MAX6729KA3D3+T and TPS3808G33DBVR, MAX6728KASVD3+T uniquely combines open-drain PFO flexibility, guaranteed 0.8V operation, and factory-trimmed triple-threshold precision - making it optimal for space-constrained industrial and telecom systems requiring both robust reset and configurable power-fail signaling.
Availability
MAX6728KASVD3+T is available at Aetrix Electronics and suitable for telecom power sequencing, industrial PLC I/O modules, network switch ASIC power management, and battery-powered medical monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6728KASVD3+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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX6715–MAX6729 family delivers ultra-low-voltage, multi-rail supervisory functionality in miniature SOT23 packages - engineered specifically for reliability-critical embedded systems where power integrity, small size, and guaranteed reset behavior under brownout are mandatory.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6728KASVD3+T?
The MAX6728KASVD3+T has a factory-trimmed VCC1 reset threshold of 3.075V (typical), with ±1.5% tolerance over temperature and supply variations. This value is encoded in the "AS" suffix per Maxim's Reset Voltage Threshold Suffix Guide and is verified across the full -40°C to +85°C operating range.
Does the MAX6728KASVD3+T support monitoring a negative supply voltage?
Yes, the MAX6728KASVD3+T can monitor negative supplies using the PFI input with an appropriate resistor-divider network as shown in Figure 3b of the datasheet. When the negative supply drops, PFO transitions high, enabling interrupt-driven response - a capability confirmed in the "Monitoring a Negative Voltage" section of the official documentation.
What is the function of Pin 8 (NC) on the MAX6728KASVD3+T?
Pin 8 on the MAX6728KASVD3+T is designated NC (No Connect) and is internally unconnected. It must be left floating or tied to GND per Maxim's layout recommendations to avoid parasitic coupling; it does not serve any electrical function in the MAX6728KASVD3+T circuit operation.
How does the power-fail output (PFO) behave relative to the reset output (RST) on the MAX6728KASVD3+T?
The PFO output on MAX6728KASVD3+T asserts immediately (2µs typical delay) when PFI falls below 626.5mV and deasserts instantly when PFI rises above threshold - with no timeout period. In contrast, RST remains asserted for the full 210ms minimum timeout after all monitored voltages recover, providing distinct roles: PFO for fast warning, RST for guaranteed system reset hold.
Is the MAX6728KASVD3+T compatible with 1.8V-only systems?
Yes, the MAX6728KASVD3+T supports VCC1 as low as 1.8V and VCC2 as low as 0.9V, with guaranteed reset validity down to 0.8V on either supply. Its 3.075V/2.925V thresholds are appropriate for 3.3V/2.5V systems, but the device itself functions correctly in 1.8V-biased configurations when used with external resistor dividers on PFI for auxiliary rail monitoring.
MAX6728KASVD3+T 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:
- -
MAX6728KASVD3+T FAQ
1.How can I place an order for MAX6728KASVD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6728KASVD3+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 MAX6728KASVD3+T reliable?
The price and inventory of MAX6728KASVD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6728KASVD3+T is usually 5 days.
3.What payment methods are accepted for MAX6728KASVD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6728KASVD3+T transactions.
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4.How is shipping managed for MAX6728KASVD3+T?
MAX6728KASVD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6728KASVD3+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 MAX6728KASVD3+T?
For technical support, including MAX6728KASVD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6728KASVD3+T requirements.
6.How does Aetrix verify that MAX6728KASVD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6728KASVD3+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 MAX6728KASVD3+T meets industry standards.
7.What is the process for return or replacement of MAX6728KASVD3+T?
All MAX6728KASVD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6728KASVD3+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 MAX6728KASVD3+T part is unused and in its original packaging.
Return procedure for MAX6728KASVD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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