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Analog Devices Inc./Maxim Integrated MAX6726KAZWD3+
- Part No.:
- MAX6726KAZWD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6726KAZWD3+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,278
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Product details
Overview
MAX6726KAZWD3+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (1.62V threshold), VCC2 (2.313V threshold), and an externally adjustable RSTIN input (626.5mV reference) with 210ms reset timeout, watchdog timer, manual reset, and push-pull active-high RST output - used in multivoltage telecom and industrial power management systems.
For engineers reviewing the MAX6726KAZWD3+ datasheet, MAX6726KAZWD3+ pinout, MAX6726KAZWD3+ application, or MAX6726KAZWD3+ equivalent, key selection factors include its triple-supply monitoring capability, guaranteed reset validity down to VCC = 0.8V, 14µA typical supply current at 3.6V, and integrated watchdog with 35s startup/1.12s normal timeout periods.
Technical Context
The MAX6726KAZWD3+ implements dual independent voltage comparators for VCC1 and VCC2 plus a high-impedance RSTIN comparator referenced to a 626.5mV internal bandgap, enabling precise third-supply monitoring via external resistor divider. Its reset logic asserts RST high when any monitored voltage falls below its factory-trimmed threshold and holds for 210ms after recovery.
This device integrates a dual-mode watchdog timer: a 35s minimum initial timeout after reset enables full system boot, followed by a 1.12s minimum normal timeout requiring periodic WDI transitions. It features push-pull RST output referenced to VCC1, manual reset input with 50kΩ internal pullup, and operates across -40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 1.620V (factory-trimmed, ±3% over temp; ensures reliable reset assertion for 1.8V core supplies) |
| VCC2 Reset Threshold | 2.313V (factory-trimmed, ±3% over temp; monitors 2.5V I/O rails with margin) |
| RSTIN Reference Voltage | 626.5mV (internal precision bandgap; enables monitoring of auxiliary supplies ≥0.62V via resistor divider) |
| Reset Timeout Period | 210ms (minimum; guarantees µP reset hold time sufficient for full firmware initialization) |
| Watchdog Timeout | 1.12s (normal mode minimum; detects processor lockup within sub-second latency) |
| Supply Current | 14µA (typical at 3.6V; enables battery-backed operation for >10 years in low-power systems) |
| Operating Temperature | -40°C to +85°C (industrial-grade range; supports deployment in uncontrolled environments) |
Pinout & Package
MAX6726KAZWD3+ is housed in an 8-pin SOT23-8 package (2.0mm × 2.1mm × 1.25mm), thermally optimized for high-density PCB layouts and compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-high push-pull reset output referenced to VCC1; drives high during fault and holds for 210ms after recovery |
| 2 | GND | System ground reference for all internal comparators and logic; must be low-impedance connection |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1; pulse low ≥1µs to force reset |
| 4 | PFO | Active-low power-fail output (push-pull); asserts when PFI < 626.5mV, deasserts immediately without timeout |
| 5 | VCC2 | Secondary supply input (0.9V–3.3V range); powers internal VCC2 comparator and sets RST2 reference |
| 6 | VCC1 | Primary supply input (1.8V–5.0V range); powers device core, sets RST reference, and enables reset validity down to 0.8V |
| 7 | PFI | Power-fail monitor input; high-impedance node (±25nA) for resistor-divider-based threshold setting at 626.5mV |
| 8 | WDI | Watchdog input; requires rising/falling edge every ≤1.12s in normal mode to prevent reset assertion |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring | Simultaneous VCC1/VCC2/RSTIN supervision enables single-chip protection for complex multirail systems (e.g., CPU core + I/O + analog) |
| Guaranteed reset validity | Operates correctly with VCC1 or VCC2 ≥ 0.8V - critical for brownout detection before complete power collapse |
| Dual-mode watchdog timer | 35s startup window accommodates full boot sequence; 1.12s runtime timeout catches software hangs without false triggers |
| Low quiescent current | 14µA typical at 3.6V reduces battery drain in always-on monitoring applications (e.g., remote sensors, backup controllers) |
| Push-pull RST output | Eliminates need for external pullup resistor; provides rail-to-rail drive strength for direct µP reset pin interface |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Monitoring primary 3.3V backplane supply, secondary 2.5V FPGA I/O bank, and auxiliary 1.2V analog sensor rail in a carrier-grade line card. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting active-high RST to halt processor execution within 20µs of any rail undervoltage, holding reset for 210ms post-recovery. Use Value: Prevents corrupted configuration writes during partial power loss, ensuring deterministic restart after AC interruption or hot-swap events. |
Use Scenario: Supervising 24V DC input, isolated 5V logic supply, and 3.3V microcontroller core in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Using PFI to monitor pre-regulated 24V input via resistor divider; triggering PFO interrupt for orderly shutdown before main supply collapse. Use Value: Enables firmware-controlled safe state transition and EEPROM save operations during brownout, meeting IEC 61000-4-29 immunity requirements. |
| Server Baseboard Management | Battery-Powered Medical Monitor |
|
Use Scenario: Coordinating reset sequencing between 12V VRM input, 1.8V memory VDDQ, and 0.85V CPU core in a server BMC subsystem. IC Role / Device Role / Timing Role: Leveraging MR input for hardware-initiated reset during thermal trip events; WDI tied to BMC heartbeat signal. Use Value: Ensures synchronized reset across multiple voltage domains while maintaining watchdog coverage during firmware updates. |
Use Scenario: Monitoring lithium-ion battery voltage (via RSTIN divider), 3.3V LDO output, and 1.8V sensor interface rail in a portable ECG device. IC Role / Device Role / Timing Role: Using 14µA supply current and 210ms timeout to extend battery life while guaranteeing clean reset on battery depletion below 3.0V. Use Value: Eliminates risk of erratic behavior during end-of-life battery discharge, supporting FDA Class II device reliability 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 |
|---|---|---|---|
| MAX6725KAZWD3+ | Provides dual open-drain RST outputs (RST1/RST2) instead of single push-pull RST; same thresholds, timeout, and feature set | Requires external pullup resistors; better suited for bidirectional µP reset pins or wired-OR reset bus architectures | Select when interfacing with processors requiring open-drain reset signaling or multi-drop reset distribution |
| TPS3808G33DBVR | Dual-supply monitor only (VDD/VDD2); no RSTIN/PFI/WDI; 3.3V fixed VDD threshold; 200ms timeout; 1.1µA IQ | Lacks third-supply monitoring and watchdog; optimized for ultra-low-power dual-rail systems without auxiliary monitoring needs | Select when only two rails require supervision and nanowatt standby current is prioritized over feature completeness |
Compared with MAX6726KAZWD3+, MAX6725KAZWD3+ offers identical supervision accuracy and timing but requires external pullups due to open-drain outputs, while TPS3808G33DBVR trades triple-monitoring and watchdog capability for significantly lower quiescent current in simpler dual-rail applications.
Availability
MAX6726KAZWD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, server baseboard management, and battery-powered medical devices requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature operation.
Supply support for MAX6726KAZWD3+ 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 connectivity in demanding industrial, automotive, and communications applications.
The MAX6715–MAX6729 family delivers compact, low-power supervisory solutions for multivoltage systems where simultaneous monitoring of core, I/O, and auxiliary rails is essential to system reliability.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6726KAZWD3+?
The MAX6726KAZWD3+ has a factory-trimmed VCC1 reset threshold of 1.620V (typical), with ±3% tolerance over temperature. This value is encoded in the "Z" suffix per Maxim's Reset Voltage Threshold Suffix Guide and is validated across the full -40°C to +85°C operating range. The threshold remains stable with 20ppm/°C tempco, ensuring consistent behavior in varying thermal environments.
Does the MAX6726KAZWD3+ support monitoring a third voltage, and how is it configured?
Yes, the MAX6726KAZWD3+ supports third-voltage monitoring via its RSTIN pin, which compares the applied voltage against a precise 626.5mV internal reference. To monitor an auxiliary supply (e.g., 1.2V), connect a resistor divider from that rail to RSTIN and GND, sized so the divided voltage equals 626.5mV at the trip point. The high-impedance input (±25nA) minimizes loading.
What are the watchdog timer characteristics of the MAX6726KAZWD3+?
The MAX6726KAZWD3+ features a dual-mode watchdog: a 35s minimum initial timeout after any reset event (power-up, MR, or watchdog timeout) allows full system boot, followed by a 1.12s minimum normal timeout requiring WDI transitions. The timer clears on any rising or falling edge at WDI and asserts RST if no edge occurs within the timeout window.
How does the MAX6726KAZWD3+ ensure valid reset operation during deep brownout conditions?
The MAX6726KAZWD3+ guarantees correct reset output logic state even when VCC1 or VCC2 drops to 0.8V - well below typical reset thresholds. This is achieved through internal biasing and rail-aware output drivers. For applications requiring reset assertion down to 0V, a pullup resistor from RST to VCC1 is recommended, as the device's push-pull output remains functional through the entire 0.8V–5.5V supply range.
What package type and pin count does the MAX6726KAZWD3+ use?
The MAX6726KAZWD3+ uses an 8-pin SOT23-8 package (2.0mm × 2.1mm footprint, 1.25mm height), confirmed by Maxim's Ordering Information table and Pin Configurations section. This compact, surface-mount package supports high-density layouts and is compatible with standard automated assembly processes and IPC-7351B land patterns.
MAX6726KAZWD3+ 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6726KAZWD3+ FAQ
1.How can I place an order for MAX6726KAZWD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6726KAZWD3+ 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 MAX6726KAZWD3+ reliable?
The price and inventory of MAX6726KAZWD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6726KAZWD3+ is usually 5 days.
3.What payment methods are accepted for MAX6726KAZWD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6726KAZWD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6726KAZWD3+?
MAX6726KAZWD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6726KAZWD3+ 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 MAX6726KAZWD3+?
For technical support, including MAX6726KAZWD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6726KAZWD3+ requirements.
6.How does Aetrix verify that MAX6726KAZWD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6726KAZWD3+ 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 MAX6726KAZWD3+ meets industry standards.
7.What is the process for return or replacement of MAX6726KAZWD3+?
All MAX6726KAZWD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6726KAZWD3+, 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 MAX6726KAZWD3+ part is unused and in its original packaging.
Return procedure for MAX6726KAZWD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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