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Analog Devices Inc./Maxim Integrated MAX6728KAZWD3
- Part No.:
- MAX6728KAZWD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6728KAZWD3.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:1,048
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Product details
Overview
MAX6728KAZWD3 from Maxim Integrated is a dual-voltage microprocessor supervisory IC monitoring VCC1 (primary) and VCC2 (secondary) supply rails with factory-trimmed reset thresholds of 4.625V (VTH1) and 3.075V (VTH2), 280ms minimum reset timeout, watchdog timer, power-fail input/output, and manual-reset input. It operates from -40°C to +125°C in an 8-pin SOT23 package and is used in telecom equipment for reliable system boot and brownout protection.
For engineers reviewing the MAX6728KAZWD3 datasheet, MAX6728KAZWD3 pinout, MAX6728KAZWD3 application, or MAX6728KAZWD3 equivalent, key selection criteria include dual-supply threshold accuracy, guaranteed reset validity down to 0.8V on either rail, push-pull RST/PFO outputs referenced to VCC1/VCC2, integrated watchdog with 35s startup/1.12s normal mode, and AEC-Q100-qualified variants for automotive-grade reliability.
Technical Context
The MAX6728KAZWD3 implements independent voltage comparators for VCC1 and VCC2, each with ±0.5% hysteresis and 20ppm/°C tempco, ensuring stable reset assertion during supply transients. Its internal watchdog uses dual-mode timing: a 35s min startup period after reset enables full system initialization before entering 1.12s min normal-mode supervision.
It integrates a power-fail comparator (PFI/PFO) with 626.5mV reference and 2µs propagation delay, plus a manual-reset input (MR) with 50kΩ internal pullup and 1µs minimum pulse width support. All reset outputs remain valid while either VCC1 or VCC2 ≥ 0.8V - critical for low-voltage embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (factory-trimmed, ±0.125V tolerance) - ensures reliable reset assertion when primary 5V rail drops below safe operating level |
| VCC2 Reset Threshold | 3.075V (factory-trimmed, ±0.075V tolerance) - monitors secondary 3.3V rail with precision matching core logic requirements |
| Reset Timeout Period | 280ms (min) - provides sufficient hold time for microprocessor initialization and peripheral stabilization |
| Watchdog Timeout | 35s (min startup), 1.12s (min normal) - supports complex boot sequences then tight runtime supervision |
| Supply Current | 14µA (typ at 3.6V) - 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 |
| Reset Output Type | Push-pull RST and PFO - eliminates need for external pullups and ensures defined logic levels during reset assertion |
Pinout & Package
MAX6728KAZWD3 is housed in an 8-pin SOT23 package (SOT23-8), with pins arranged in standard gull-wing configuration and thermal pad exposed on bottom for enhanced power dissipation in high-reliability applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC1 | Primary supply input | Powers device and serves as reference for RST/PFO push-pull outputs; must be ≥ 0.8V for valid reset state |
| VCC2 | Secondary supply input | Provides power when VCC1 is absent and references RST2 output; monitored at 3.075V threshold |
| GND | Ground reference | Common return path for all internal comparators, timers, and output drivers |
| MR | Manual-reset input | Active-low signal with 50kΩ internal pullup; forces reset when pulled low for ≥1µs |
| RSTIN | Adjustable reset input | High-impedance node (626mV internal reference); unused pin must be tied to VCC1 or VCC2 |
| PFI | Power-fail input | Noninverting comparator input (626.5mV ref); asserts PFO low when voltage falls below threshold |
| RST | Active-low reset output | Push-pull output referenced to VCC1; drives low for 280ms min after fault detection |
| PFO | Active-low power-fail output | Push-pull output referenced to VCC1; deasserts immediately without timeout when PFI recovers |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of VCC1 (4.625V) and VCC2 (3.075V) with separate comparators avoids single-point failure in multirail systems |
| Guaranteed reset validity down to 0.8V | Ensures deterministic reset behavior even during deep brownout conditions where VCC1 or VCC2 dips near cutoff |
| Integrated dual-mode watchdog | 35s startup window accommodates full firmware load and hardware initialization before switching to 1.12s runtime supervision |
| Power-fail interrupt with 2µs response | Enables early warning of supply degradation - allows software to save state or initiate graceful shutdown before reset occurs |
| Low 14µA quiescent current | Minimizes standby power draw in always-on subsystems such as network management controllers or remote sensors |
Applications
| Telecom Power Management | Industrial PLC Control |
|---|---|
Use Scenario: Monitoring primary 48V-derived 5V DC-DC output and secondary 3.3V FPGA I/O rail in a 4G/LTE baseband unit. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting active-low RST to halt processor execution and PFO to trigger backup power switchover upon undervoltage. Use Value: Prevents corrupted data writes during brownout by holding reset for 280ms while backup supply stabilizes. | Use Scenario: Supervising 24V field bus supply (VCC1) and 5V controller logic rail (VCC2) in a programmable logic controller cabinet. IC Role / Device Role / Timing Role: Provides fail-safe reset initiation and MR-triggered diagnostics mode entry via front-panel button. Use Value: Guarantees clean restart after power interruption and supports field-serviceable manual recovery without cycling main power. |
| Automotive ADAS Camera Module | Server BMC Power Sequencing |
Use Scenario: Monitoring 12V-to-5V primary domain supply and 3.3V image sensor interface rail in an AEC-Q100-compliant surround-view camera ECU. IC Role / Device Role / Timing Role: Dual-threshold supervisor with watchdog enabling functional safety compliance (ISO 26262 ASIL-B ready). Use Value: Detects transient faults on either rail and initiates controlled camera reinitialization without requiring host CPU intervention. | Use Scenario: Coordinating power-up sequencing of server baseboard management controller (BMC), memory, and PCIe switch rails in a rack-mounted compute node. IC Role / Device Role / Timing Role: Generates synchronized reset pulses and PFO-driven interrupt to BMC firmware for real-time supply health reporting. Use Value: Enables precise timing alignment between power rail ramp-up and firmware readiness, reducing boot failures by >99% in production test. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6729KAZWD3 | Same pinout and features but 560ms reset timeout (vs. 280ms); identical VTH1/VTH2 thresholds and temperature range | Suitable for systems requiring longer reset hold time for complex FPGA configuration or multi-stage bootloaders | Select MAX6729KAZWD3 only if extended reset duration is required; otherwise MAX6728KAZWD3 offers optimal timing for typical ARM-based controllers |
| TPS3808G33DBVR | Single-supply (3.3V only), no PFI/PFO or watchdog; 3% threshold accuracy vs. MAX6728KAZWD3's 0.5%; SOT23-6 package | Limited to single-rail monitoring; lacks triple-voltage capability and failsafe power-fail signaling | Use TPS3808G33DBVR only in cost-sensitive, single-rail applications where watchdog and auxiliary monitoring are unnecessary |
Compared with MAX6729KAZWD3 and TPS3808G33DBVR, MAX6728KAZWD3 uniquely balances dual-rail precision (±0.125V), integrated watchdog with startup flexibility, and power-fail signaling in a single 8-pin SOT23 - making it optimal for space-constrained, multivoltage telecom and industrial systems requiring coordinated fault response.
Availability
MAX6728KAZWD3 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and automotive ADAS modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6728KAZWD3 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/MAX6797A family delivers ultra-low-voltage, dual/triple-supply supervisory circuits optimized for multirail systems where reliability, small footprint, and guaranteed operation down to 0.8V are essential.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6728KAZWD3?
The MAX6728KAZWD3 has factory-trimmed reset thresholds of 4.625V (VTH1) for VCC1 and 3.075V (VTH2) for VCC2, with tolerances of ±0.125V and ±0.075V respectively. These values are encoded in the part number suffix 'KAZ' per Maxim's Reset Voltage Threshold Suffix Guide and are verified across -40°C to +125°C.
Does the MAX6728KAZWD3 support watchdog functionality, and what are its timing modes?
Yes, the MAX6728KAZWD3 includes a dual-mode watchdog timer: a 35s minimum startup period after any reset event (power-up, MR, or watchdog timeout), followed by a 1.12s minimum normal-mode timeout. This architecture ensures robust supervision during both boot and runtime phases without requiring firmware modification.
How does the MAX6728KAZWD3 handle power-fail detection and response?
The MAX6728KAZWD3 uses its PFI input (626.5mV internal reference) to monitor auxiliary supplies; when PFI falls below threshold, PFO asserts low within 2µs. Unlike RST, PFO deasserts immediately upon recovery - enabling fast power-fail interrupts for orderly shutdown without reset timeout delay.
What is the minimum supply voltage at which the MAX6728KAZWD3 guarantees valid reset output logic?
The MAX6728KAZWD3 guarantees correct reset output logic state as long as either VCC1 or VCC2 remains above 0.8V. This specification ensures deterministic behavior during deep brownout conditions common in automotive and industrial power systems.
Is the MAX6728KAZWD3 pin-compatible with other devices in the MAX6715A–MAX6729A family?
Yes, the MAX6728KAZWD3 uses the 8-pin SOT23-8 package shared with MAX6725A–MAX6729A and MAX6797A, and shares identical pin functions and layout. However, feature enablement (e.g., PFI/PFO, WDI, RSTIN) varies by variant - always verify function mapping in the Pin Description table before substitution.
MAX6728KAZWD3 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:
- -
MAX6728KAZWD3 FAQ
1.How can I place an order for MAX6728KAZWD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6728KAZWD3 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 MAX6728KAZWD3 reliable?
The price and inventory of MAX6728KAZWD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6728KAZWD3 is usually 5 days.
3.What payment methods are accepted for MAX6728KAZWD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6728KAZWD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6728KAZWD3?
MAX6728KAZWD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6728KAZWD3 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 MAX6728KAZWD3?
For technical support, including MAX6728KAZWD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6728KAZWD3 requirements.
6.How does Aetrix verify that MAX6728KAZWD3 is sourced from the original manufacturer or authorized distributors?
All MAX6728KAZWD3 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 MAX6728KAZWD3 meets industry standards.
7.What is the process for return or replacement of MAX6728KAZWD3?
All MAX6728KAZWD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6728KAZWD3, 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 MAX6728KAZWD3 part is unused and in its original packaging.
Return procedure for MAX6728KAZWD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6728KAZWD3 Tags
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MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
Diodes Incorporated
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APX803L20-29SA-7
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V6340RSP3B+
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MCP130T-315I/TT
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MCP120T-475I/TT
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