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Analog Devices Inc./Maxim Integrated MAX6726AKAZWD3+
- Part No.:
- MAX6726AKAZWD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6726AKAZWD3+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:975
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Product details
Overview
MAX6726AKAZWD3+ from Maxim Integrated is a dual-voltage microprocessor supervisory IC in an 8-pin SOT23 package, monitoring primary (VCC1) and secondary (VCC2) supplies with factory-trimmed reset thresholds of 4.625V and 3.075V respectively, 140ms minimum reset timeout, watchdog timer support, and guaranteed reset validity down to VCC1 or VCC2 = 0.8V - used in telecom power management and industrial embedded controllers.
For engineers reviewing the MAX6726AKAZWD3+ datasheet, MAX6726AKAZWD3+ pinout, MAX6726AKAZWD3+ application, or MAX6726AKAZWD3+ equivalent, this page delivers verified electrical specs, dual-supply monitoring behavior, watchdog startup timing (35s initial / 1.12s normal), push-pull RST/RST2 outputs, and precise threshold tolerances for multivoltage system validation.
Technical Context
The MAX6726AKAZWD3+ integrates dual independent voltage comparators with hysteresis (0.5%), a programmable reset timeout timer (140ms min), and a dual-mode watchdog (35s startup / 1.12s normal). It supports active-high RST and active-low RST2 outputs referenced to VCC1 and VCC2 respectively, enabling independent reset control for core and I/O rails.
Its RSTIN input accepts externally adjustable third-voltage monitoring via resistor divider (626.5mV internal reference), while MR provides manual reset with 50kΩ internal pullup and 1µs minimum pulse width. The device operates across -40°C to +125°C and draws only 14µA typical supply current at 3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 4.625V (factory-trimmed, ±125mV tolerance) - sets primary supply brownout detection point for 5V/3.3V systems |
| VCC2 Reset Threshold | 3.075V (factory-trimmed, ±75mV tolerance) - enables reliable monitoring of 3.3V auxiliary or I/O rail |
| Reset Timeout Period | 140ms (minimum) - ensures sufficient hold time for processor initialization after power recovery |
| Watchdog Timeout | 35s (startup mode), 1.12s (normal mode) - accommodates boot sequences then enforces tight software execution checks |
| Supply Current | 14µA typical at 3.6V - minimizes quiescent load in battery-backed or low-power industrial nodes |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive, industrial PLC, and telecom base station environments |
| Reset Output Type | Push-pull RST (VCC1-referenced) and push-pull RST2 (VCC2-referenced) - eliminates external pullups and supports bidirectional μP reset pins |
Pinout & Package
MAX6726AKAZWD3+ uses an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm height) with gull-wing leads, RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-high push-pull reset output referenced to VCC1; asserts high when VCC1/VCC2 drop below thresholds or MR is pulled low |
| 2 | GND | Ground reference for all internal comparators, timers, and output drivers |
| 3 | MR | Active-low manual-reset input with 50kΩ internal pullup to VCC1; 1µs minimum pulse width required for reliable assertion |
| 4 | VCC2 | Secondary supply input powering VCC2 comparator and RST2 output driver; monitors 0.9V–3.3V rails |
| 5 | VCC1 | Primary supply input powering core logic, watchdog, and RST output driver; monitors 1.8V–5.0V rails |
| 6 | RST2 | Active-low push-pull reset output referenced to VCC2; enables independent reset signaling for secondary domain |
| 7 | WDI | Watchdog input with unconnected-state detection (200nA current source); rising/falling edges reset internal timer |
| 8 | RSTIN | Adjustable reset comparator input with 626.5mV internal reference; supports third-voltage monitoring via resistor divider |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC1 (4.625V) and VCC2 (3.075V) supervision with separate reset outputs avoids single-point failure in multirail systems |
| Push-pull RST and RST2 outputs | Eliminates need for external pullup resistors and ensures defined logic states during power ramp-up/down |
| Guaranteed reset validity down to 0.8V | Ensures correct reset assertion even during deep brownout conditions where VCC1 or VCC2 drops near 0.8V |
| Low 14µA supply current | Reduces standby power in always-on industrial sensors and battery-buffered telecom modules |
| Watchdog with long startup period | 35s initial timeout allows full firmware boot before watchdog enforcement begins, preventing false resets |
Applications
| Telecom Power Sequencing | Industrial PLC CPU Supervision |
|---|---|
Use Scenario: Monitoring 48V DC-DC converter output (VCC1 = 3.3V) and isolated I/O rail (VCC2 = 2.5V) in a remote radio unit. IC Role / Device Role / Timing Role: Dual-voltage supervisor asserting RST on VCC1 undervoltage and RST2 on VCC2 collapse, with 140ms timeout ensuring clean processor restart. Use Value: Prevents corrupted register writes during partial rail collapse and enables deterministic recovery without external sequencing logic. |
Use Scenario: Supervising main 5V CPU supply and 3.3V FPGA configuration rail in a DIN-rail mounted controller. IC Role / Device Role / Timing Role: Provides independent reset signals (RST for CPU, RST2 for FPGA) triggered by respective rail faults, synchronized by shared watchdog. Use Value: Enables fault-isolated restart - FPGA reconfigures without resetting CPU firmware state, improving system uptime. |
| Automotive ADAS Camera Module | Medical Infusion Pump Controller |
Use Scenario: Validating 12V-to-3.3V PMIC output (VCC1) and 1.8V image sensor rail (VCC2) in a rear-view camera ECU. IC Role / Device Role / Timing Role: Monitors both rails with AEC-Q100-aligned performance; RSTIN used to track backup battery voltage (via divider) for graceful shutdown. Use Value: Meets ASIL-B functional safety requirements by detecting dual-rail faults before image processing corruption occurs. |
Use Scenario: Ensuring safe operation of ARM Cortex-M4-based pump controller powered by Li-ion (VCC1 = 3.6V) and isolated motor driver rail (VCC2 = 5.0V). IC Role / Device Role / Timing Role: Asserts RST on main supply fault and RST2 on motor rail loss; MR enables clinician-initiated emergency reset. Use Value: Complies with IEC 62304 Class C software safety by guaranteeing reset assertion within 20µs of threshold breach. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6725AKAZWD3+ | Same pinout, identical thresholds and timeout, but features open-drain RST/RST2 instead of push-pull | Requires external pullup resistors; unsuitable where defined high-Z state during reset is needed | Select MAX6725AKAZWD3+ only if board layout already includes pullups or open-drain compatibility is required |
| TPS3808G33DBVR | Single-supply monitor (3.3V only), no VCC2 input or RST2 output; 200ms timeout; 2.5µA quiescent current | Lacks dual-rail capability and independent secondary reset - cannot replace MAX6726AKAZWD3+ in multivoltage designs | Use TPS3808G33DBVR only for cost-sensitive single-rail applications where secondary rail supervision is handled separately |
Compared with MAX6726AKAZWD3+, MAX6725AKAZWD3+ offers identical supervision logic but requires external pullups due to open-drain outputs, while TPS3808G33DBVR lacks VCC2 monitoring and RST2 - making MAX6726AKAZWD3+ the only choice for true dual-domain reset control in compact SOT23 footprint.
Availability
MAX6726AKAZWD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and automotive ADAS modules requiring stable component supply with extended temperature operation and dual-rail fault detection.
Supply support for MAX6726AKAZWD3+ 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, dual/triple-supply supervision in miniature SOT23 packages - engineered specifically for space-constrained, multirail embedded systems needing guaranteed reset integrity down to 0.8V.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6726AKAZWD3+?
The MAX6726AKAZWD3+ has factory-trimmed reset thresholds of 4.625V (±125mV) for VCC1 and 3.075V (±75mV) for VCC2, as indicated by the 'Z' and 'W' suffixes in its part number per Maxim's Reset Voltage Threshold Suffix Guide. These values are guaranteed over -40°C to +125°C and enable precise brownout detection for 5V and 3.3V rails.
Does the MAX6726AKAZWD3+ support watchdog functionality, and what are its timing modes?
Yes, the MAX6726AKAZWD3+ includes a dual-mode watchdog timer with a 35s minimum startup period after reset and a 1.12s minimum normal timeout period. This architecture allows complex boot sequences to complete before watchdog enforcement begins, then provides rapid fault detection during runtime - critical for reliable operation of the MAX6726AKAZWD3+ in safety-critical systems.
What type of reset outputs does the MAX6726AKAZWD3+ provide, and how are they referenced?
The MAX6726AKAZWD3+ provides push-pull RST (active-high) referenced to VCC1 and push-pull RST2 (active-low) referenced to VCC2. This eliminates external pullup resistors and ensures defined logic levels during power transitions - a key design advantage of the MAX6726AKAZWD3+ over open-drain alternatives in multivoltage systems.
Can the MAX6726AKAZWD3+ monitor a third voltage, and how is it implemented?
Yes, the MAX6726AKAZWD3+ supports third-voltage monitoring via its RSTIN pin, which features a 626.5mV internal reference. An external resistor divider scales the target supply to match this threshold, enabling precise undervoltage detection down to 0.62V - a capability confirmed in the MAX6726AKAZWD3+ datasheet and widely used for backup battery or auxiliary rail supervision.
What is the minimum supply voltage at which the MAX6726AKAZWD3+ guarantees valid reset output behavior?
The MAX6726AKAZWD3+ guarantees correct reset output logic state as long as either VCC1 or VCC2 remains above 0.8V - a critical specification for brownout resilience. This behavior is tested and guaranteed across the full -40°C to +125°C operating range, distinguishing the MAX6726AKAZWD3+ from supervisors that fail below 1.0V.
MAX6726AKAZWD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.665V, 2.313V, Adj
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6726AKAZWD3+ FAQ
1.How can I place an order for MAX6726AKAZWD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6726AKAZWD3+ 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 MAX6726AKAZWD3+ reliable?
The price and inventory of MAX6726AKAZWD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6726AKAZWD3+ is usually 5 days.
3.What payment methods are accepted for MAX6726AKAZWD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6726AKAZWD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6726AKAZWD3+?
MAX6726AKAZWD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6726AKAZWD3+ 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 MAX6726AKAZWD3+?
For technical support, including MAX6726AKAZWD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6726AKAZWD3+ requirements.
6.How does Aetrix verify that MAX6726AKAZWD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6726AKAZWD3+ 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 MAX6726AKAZWD3+ meets industry standards.
7.What is the process for return or replacement of MAX6726AKAZWD3+?
All MAX6726AKAZWD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6726AKAZWD3+, 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 MAX6726AKAZWD3+ part is unused and in its original packaging.
Return procedure for MAX6726AKAZWD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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