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Analog Devices Inc./Maxim Integrated MAX6726KAZWD3+T
- Part No.:
- MAX6726KAZWD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6726KAZWD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6726KAZWD3+T 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 RSTIN (626.5mV reference) with 210ms reset timeout, push-pull RST output, manual reset input, and watchdog timer - used for reliable power-up sequencing and brownout protection in multivoltage embedded systems.
For engineers reviewing the MAX6726KAZWD3+T datasheet, MAX6726KAZWD3+T pinout, MAX6726KAZWD3+T application, or MAX6726KAZWD3+T equivalent, key selection criteria include its dual-supply monitoring capability down to 0.8V operation, guaranteed reset validity during low-VCC conditions, integrated watchdog with 35s startup/1.12s normal timeout, and compatibility with battery-backed or telecom power architectures requiring precise undervoltage detection.
Technical Context
The MAX6726KAZWD3+T implements independent voltage comparators for VCC1 and VCC2 with factory-trimmed thresholds (1.62V/2.313V), plus a high-impedance RSTIN input referenced to a 626.5mV internal bandgap - enabling third-voltage monitoring via external resistor divider. Its reset logic asserts active-low RST when any monitored supply falls below threshold and holds for 210ms after recovery.
This device integrates a dual-mode watchdog timer (35s min startup, 1.12s min normal timeout), manual reset input with 50kΩ internal pullup, and operates across -40°C to +85°C with supply current as low as 14µA at 3.6V - all within a lead-free 8-pin SOT23 package optimized for space-constrained industrial and portable designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 1.62V (typ), factory-trimmed - ensures reliable reset assertion during 1.8V rail brownout |
| VCC2 Threshold | 2.313V (typ), factory-trimmed - monitors 2.5V or 3.3V secondary supplies with ±0.5% hysteresis |
| RSTIN Reference | 626.5mV (typ) internal bandgap - enables adjustable third-voltage monitoring down to 0.62V |
| Reset Timeout | 210ms (min), D3 suffix - provides sufficient hold time for complex processor initialization sequences |
| Supply Current | 14µA (typ) at 3.6V - minimizes quiescent power draw in battery-operated equipment |
| Operating Temp | -40°C to +85°C - supports industrial and telecom-grade thermal environments without derating |
| Watchdog Timeout | 1.12s (min) normal mode, 35s (min) startup mode - accommodates boot firmware execution before watchdog enforcement |
Pinout & Package
MAX6726KAZWD3+T is housed in an 8-pin SOT23 package (3.0mm × 1.7mm × 1.3mm height), RoHS-compliant and lead-free (+T suffix), with exposed pad for thermal enhancement and standard reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1 - drives µP reset pin directly without external pullup |
| 2 | GND | System ground reference - must be connected to lowest-impedance ground plane for noise immunity |
| 3 | MR | Active-low manual reset input with 50kΩ internal pullup to VCC1 - debounced by 1µs minimum pulse width |
| 4 | PFO | Active-low power-fail output (open-drain) - signals early power degradation before VCC1/VCC2 thresholds are breached |
| 5 | RSTIN | Adjustable reset comparator input - monitors third supply via resistor divider; 25nA max input current preserves accuracy |
| 6 | VCC2 | Secondary supply input (0.9V–3.3V range) - powers internal circuitry when above VCC1 and sets VCC2 threshold |
| 7 | WDI | Watchdog input - detects µP activity; reset triggered if no edge occurs within 1.12s (normal mode) |
| 8 | VCC1 | Primary supply input (1.8V–5.0V range) - powers device core and defines primary reset threshold |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-trimmed voltage monitors | VCC1 = 1.62V, VCC2 = 2.313V - eliminates external resistor networks and calibration for two-rail systems |
| Externally adjustable third-voltage monitor | RSTIN with 626.5mV reference - supports custom thresholds from 0.62V using two resistors, <100nA leakage impact |
| Dual-mode watchdog timer | 35s startup / 1.12s normal timeout - prevents false resets during boot while ensuring rapid fault response in runtime |
| Guaranteed reset validity down to 0.8V | VCC1 or VCC2 ≥ 0.8V ensures functional reset assertion - critical for low-power sleep/wake transitions |
| Immunity to short VCC transients | Withstands ≤20µs glitches below threshold - avoids spurious resets in noisy power environments |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Dual-rail DC/DC converter system powering FPGA, PHY, and MCU with independent 3.3V and 1.2V rails. IC Role / Device Role / Timing Role: Monitors both rails simultaneously; asserts RST if either drops below threshold and holds for 210ms to ensure full FPGA configuration. Use Value: Prevents partial configuration lockup by guaranteeing synchronized reset across heterogeneous logic domains. |
Use Scenario: DIN-rail mounted PLC with isolated 24V input, 5V logic, and 3.3V sensor interface - subject to voltage sags during relay switching. IC Role / Device Role / Timing Role: Detects 5V rail sag below 4.5V and 3.3V rail drop below 3.0V; triggers watchdog if CPU fails to toggle WDI during polling loop. Use Value: Enables autonomous recovery from transient faults without operator intervention or external watchdog IC. |
| Battery-Backed Medical Monitor | Set-Top Box Power Management |
|
Use Scenario: Portable ECG device with Li-ion battery (2.8–4.2V), buck-boost regulator (3.3V), and LDO (1.8V) for analog front-end. IC Role / Device Role / Timing Role: Uses RSTIN to monitor battery voltage via divider; asserts reset at 2.9V to initiate graceful shutdown before brownout. Use Value: Extends usable battery life by avoiding premature shutdown while preserving data integrity during low-battery state. |
Use Scenario: Consumer STB with 12V main, 5V USB, and 3.3V SoC rails - requires coordinated reset on AC loss and brownout events. IC Role / Device Role / Timing Role: Monitors 5V and 3.3V rails; uses PFI/PFO to detect 12V pre-regulator collapse and signal power-fail interrupt to SoC. Use Value: Allows software-controlled save-and-shutdown sequence before complete power loss, preventing filesystem corruption. |
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+T | Open-drain RST and RST2 outputs instead of push-pull RST; identical thresholds, timeout, and feature set | Requires external pullup for RST; suitable where level-shifting or wired-OR reset bus is needed | Select MAX6725KAZWD3+T only when open-drain drive and dual reset outputs are required |
| TPS3808G33DBVR | Dual-voltage monitor (no RSTIN), fixed 3.3V/1.6V thresholds, 200ms timeout, no watchdog or PFI/PFO | Lacks third-voltage monitoring, power-fail signaling, and watchdog - limited to simpler dual-rail systems | Choose TPS3808G33DBVR only for cost-sensitive dual-supply applications without advanced supervision features |
Compared with MAX6726KAZWD3+T, MAX6725KAZWD3+T offers open-drain flexibility at the cost of added BOM components, while TPS3808G33DBVR reduces feature count and cost but sacrifices RSTIN adjustability, watchdog, and power-fail capability - making MAX6726KAZWD3+T optimal for complex multivoltage systems requiring full supervision coverage.
Availability
MAX6726KAZWD3+T is available at Aetrix Electronics and suitable for telecom power sequencing, industrial PLC I/O modules, battery-backed medical monitors, and set-top box power management requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6726KAZWD3+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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX6715–MAX6729 family was designed specifically for ultra-low-voltage, multirail microprocessor supervision - delivering compact, factory-trimmed reliability in SOT23 packages for space- and power-constrained embedded systems.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6726KAZWD3+T?
The MAX6726KAZWD3+T has a factory-trimmed VCC1 reset threshold of 1.62V (typical), with a guaranteed range of 1.575V to 1.665V across temperature and process variation. This value is encoded in the 'Z' suffix per Maxim's Reset Voltage Threshold Suffix Guide and applies specifically to the MAX6726KAZWD3+T - not inferred from other variants in the MAX6715–MAX6729 family.
Does the MAX6726KAZWD3+T support monitoring a third voltage, and how is it configured?
Yes, the MAX6726KAZWD3+T supports third-voltage monitoring via its RSTIN pin, which references an internal 626.5mV bandgap. To configure, connect an external resistor divider from the target supply to GND, with the midpoint fed to RSTIN. The monitored threshold is calculated as VEXT_TH = 626.5mV × (R1 + R2)/R2, enabling precise undervoltage detection down to 0.62V.
What is the function of the WDI pin on the MAX6726KAZWD3+T, and what timing behavior does it exhibit?
The WDI (Watchdog Input) pin on the MAX6726KAZWD3+T monitors µP activity: if no rising or falling edge occurs within 1.12s (normal mode), it triggers a reset. After each reset event, it enters a 35s startup mode to allow full system initialization before enforcing the shorter timeout - a dual-mode architecture unique to the MAX6726KAZWD3+T among its family.
Can the MAX6726KAZWD3+T operate reliably when VCC1 drops below 1.0V?
Yes, the MAX6726KAZWD3+T guarantees valid reset output logic states down to VCC1 or VCC2 = 0.8V - meaning it remains fully functional and asserts reset correctly even during deep brownout conditions. This specification is explicitly tested and guaranteed, distinguishing the MAX6726KAZWD3+T from supervisors that lose reset validity below 1.0V.
What package type and pin count does the MAX6726KAZWD3+T use, and is it lead-free?
The MAX6726KAZWD3+T uses an 8-pin SOT23 package (3.0mm × 1.7mm footprint, 1.3mm height) with exposed thermal pad. The '+T' suffix confirms it is lead-free and RoHS-compliant, meeting JEDEC J-STD-020 moisture sensitivity level 1 and compatible with standard reflow profiles.
MAX6726KAZWD3+T 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+T FAQ
1.How can I place an order for MAX6726KAZWD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6726KAZWD3+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 MAX6726KAZWD3+T reliable?
The price and inventory of MAX6726KAZWD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6726KAZWD3+T is usually 5 days.
3.What payment methods are accepted for MAX6726KAZWD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6726KAZWD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6726KAZWD3+T?
MAX6726KAZWD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6726KAZWD3+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 MAX6726KAZWD3+T?
For technical support, including MAX6726KAZWD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6726KAZWD3+T requirements.
6.How does Aetrix verify that MAX6726KAZWD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6726KAZWD3+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 MAX6726KAZWD3+T meets industry standards.
7.What is the process for return or replacement of MAX6726KAZWD3+T?
All MAX6726KAZWD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6726KAZWD3+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 MAX6726KAZWD3+T part is unused and in its original packaging.
Return procedure for MAX6726KAZWD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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