My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6726KAWD3+
- Part No.:
- MAX6726KAWD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6726KAWD3+.pdf
- Description:
- TRIPLE, ULTRA-LOW VOLTAGE, MICRO
- Quantity:
- Payment:
- Shipping:
Inventory:493
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6726KAWD3+ from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (primary supply) and VCC2 (secondary supply) with factory-trimmed reset thresholds of 2.925V (VTH1) and 1.665V (VTH2), 210ms minimum reset timeout, and integrated watchdog timer with 35s startup/1.12s normal mode. It ensures reliable system reset during power-up, brownout, or software fault in embedded controllers and industrial power management.
For engineers reviewing the MAX6726KAWD3+ datasheet, MAX6726KAWD3+ pinout, MAX6726KAWD3+ application, or MAX6726KAWD3+ equivalent, key selection considerations include dual-supply threshold accuracy (±1.5% over -40°C to +125°C), guaranteed reset validity down to VCC1/VCC2 = 0.8V, push-pull active-low RST/RST2 outputs, and watchdog disable via open WDI pin.
Technical Context
The MAX6726KAWD3+ implements independent voltage comparators for VCC1 and VCC2, each with 0.5% hysteresis referenced to their respective threshold voltages, and asserts reset when either supply falls below its trimmed threshold. Its internal watchdog uses dual-mode timing: a 35s minimum initial window after reset enables full system boot, followed by 1.12s minimum normal timeout on WDI edge transitions.
Reset assertion is maintained for a guaranteed minimum 210ms after all monitored supplies exceed thresholds, with immunity to sub-20µs VCC transients exceeding 100mV overdrive. The device operates across -40°C to +125°C with supply current as low as 14µA (typ) at 3.6V, and supports manual reset via MR input with 50kΩ internal pullup to VCC1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 2.925V (typ), factory-trimmed ±1.5% over temperature - sets precise brownout detection for primary 3.3V rail |
| VCC2 Reset Threshold | 1.665V (typ), factory-trimmed ±1.5% - enables reliable monitoring of secondary 1.8V core supply |
| Reset Timeout Period | 210ms (min) - ensures µP completes initialization before release from reset |
| Watchdog Timeout | 35s (min) startup / 1.12s (min) normal - accommodates long boot sequences then enforces tight software execution checks |
| Supply Current | 14µA (typ) at 3.6V - minimizes quiescent power in battery-backed or energy-sensitive systems |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive, industrial control, and telecom infrastructure |
| Reset Output Type | Push-pull active-low RST and RST2 - eliminates need for external pullup resistors, drives directly into µP reset pins |
Pinout & Package
MAX6726KAWD3+ is housed in an 8-pin SOT23 package (3.0mm × 1.7mm × 1.3mm), optimized for space-constrained PCB layouts in portable and industrial equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; asserted when VCC1/VCC2 drop below thresholds or MR pulled low |
| 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 to GND |
| 4 | PFO | Active-low push-pull power-fail output referenced to VCC1; asserts when PFI < 626.5mV, no timeout delay |
| 5 | WDI | Watchdog input; reset triggered if no edge occurs within 1.12s (normal mode); left open to disable |
| 6 | VCC2 | Secondary supply input powering comparator for VCC2 threshold monitoring and RST2 output |
| 7 | VCC1 | Primary supply input powering core logic, VCC1 comparator, RST, and PFO outputs |
| 8 | RST2 | Active-low push-pull reset output referenced to VCC2; mirrors RST assertion but driven from VCC2 domain |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent supply monitoring | Simultaneous VCC1 (2.925V) and VCC2 (1.665V) supervision with separate comparators and hysteresis |
| Guaranteed reset validity down to 0.8V | Ensures correct RST/RST2 logic state even during deep brownout conditions on either supply rail |
| Watchdog with dual-mode timing | 35s startup window avoids false triggers during boot; 1.12s normal timeout enforces real-time software health checks |
| Push-pull RST and RST2 outputs | Eliminates external pullup components and simplifies interface to µP reset inputs requiring strong drive |
| Immunity to short VCC transients | Rejects glitches <20µs duration with >100mV overdrive - prevents spurious resets in noisy power environments |
Applications
| Industrial PLC Power Sequencing | Automotive Body Control Module |
|---|---|
Use Scenario: Monitoring 5V system rail and 3.3V microcontroller core supply during cold-crank and load-dump events. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting synchronized reset to MCU and peripheral ICs upon undervoltage. Use Value: Prevents erratic MCU operation during battery voltage sag by holding reset until both rails stabilize above 2.925V and 1.665V for ≥210ms. |
Use Scenario: Ensuring safe startup and fault recovery in body ECU managing door locks, lighting, and CAN transceivers. IC Role / Device Role / Timing Role: Supervising main 12V-derived 5V supply and 1.8V domain while providing watchdog oversight of firmware execution. Use Value: Guarantees valid reset assertion down to 0.8V on either rail and delivers 1.12s watchdog timeout to detect frozen CAN stack or sensor driver loops. |
| Telecom Line Card Power Management | Medical Infusion Pump Controller |
Use Scenario: Validating redundant 3.3V and 1.2V supplies feeding FPGA, PHY, and memory on high-availability line cards. IC Role / Device Role / Timing Role: Dual-threshold supervisor with push-pull RST/RST2 outputs driving FPGA configuration reset and analog subsystem enable lines. Use Value: Enables deterministic power-on sequencing and brownout recovery without external RC networks or level shifters. |
Use Scenario: Monitoring battery-backed 3.3V logic rail and 1.8V ADC/motor driver supply in safety-critical infusion devices. IC Role / Device Role / Timing Role: Fault-tolerant supervisor with manual reset (MR) for clinician-initiated reboots and watchdog for firmware hang detection. Use Value: Meets IEC 62304 Class C requirements via guaranteed reset behavior at 0.8V, 210ms timeout, and 1.12s watchdog enforcement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6726KAWD5+ | Same dual-threshold (2.925V/1.665V) and watchdog, but 420ms reset timeout vs. 210ms | Suitable where longer reset hold time is required for complex FPGA configuration or multi-stage power sequencing | Select MAX6726KAWD5+ only if extended reset duration improves system reliability in your specific boot flow |
| TPS3808G33DBVR | Single-supply (3.3V) supervisor with 200ms timeout, no VCC2 monitoring or watchdog; SOT23-6 package | Lacks dual-rail capability and watchdog - appropriate only for simple 3.3V-only systems without software health monitoring | Choose TPS3808G33DBVR only if VCC2 supervision and watchdog are unnecessary and board space permits SOT23-6 footprint |
Compared with MAX6726KAWD3+, MAX6726KAWD5+ extends reset hold time for demanding boot sequences, while TPS3808G33DBVR reduces functionality to single-rail supervision - neither offers identical dual-supply + watchdog + 210ms timing combination.
Availability
MAX6726KAWD3+ is available at Aetrix Electronics and suitable for industrial PLCs, automotive ECUs, telecom line cards, and medical infusion pumps requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6726KAWD3+ 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 harsh-environment applications.
The MAX6715A–MAX6729A family delivers ultra-low-voltage supervisory circuits targeting space- and power-constrained embedded systems needing dual/three-rail monitoring, watchdog safety, and extended temperature operation.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6726KAWD3+?
The MAX6726KAWD3+ has factory-trimmed reset thresholds of 2.925V (typ) for VCC1 and 1.665V (typ) for VCC2, with ±1.5% tolerance over -40°C to +125°C. These values correspond to the 'K' (VCC1 = 2.925V) and 'A' (VCC2 = 1.665V) suffixes in the part number and are verified per Maxim's Reset Voltage Threshold Suffix Guide.
Does the MAX6726KAWD3+ support watchdog functionality, and how is it configured?
Yes, the MAX6726KAWD3+ includes a dual-mode watchdog timer with 35s minimum startup period and 1.12s minimum normal timeout. To enable it, connect WDI to a µP I/O pin that toggles regularly; leave WDI unconnected to disable. The internal 200nA current source detects the open state, so avoid connecting to sources >50nA.
What package type and pin count does the MAX6726KAWD3+ use?
The MAX6726KAWD3+ is packaged in an 8-pin SOT23 (3.0mm × 1.7mm × 1.3mm) with exposed pad option, confirmed by Maxim's Ordering Information table and Pin Configurations section. This compact footprint supports high-density PCB layouts in portable and industrial equipment.
How does the MAX6726KAWD3+ ensure reset validity during deep brownout conditions?
The MAX6726KAWD3+ guarantees correct reset output logic state down to VCC1 or VCC2 = 0.8V, validated across -40°C to +125°C. This ensures reliable assertion of RST and RST2 even during severe voltage sags, preventing undefined MCU behavior before complete power loss.
Can the MAX6726KAWD3+ monitor a third voltage rail, and if not, what are the alternatives?
No, the MAX6726KAWD3+ is a dual-supply supervisor (VCC1 + VCC2 only) and lacks RSTIN or PFI inputs for auxiliary voltage monitoring. For triple-rail supervision, consider MAX6723KAWD3+ (with RSTIN) or MAX6728KAWD3+ (with PFI/PFO), both sharing the same 8-pin SOT23 package and timing specifications.
MAX6726KAWD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6726KAWD3+ FAQ
1.How can I place an order for MAX6726KAWD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6726KAWD3+ 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 MAX6726KAWD3+ reliable?
The price and inventory of MAX6726KAWD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6726KAWD3+ is usually 5 days.
3.What payment methods are accepted for MAX6726KAWD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6726KAWD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6726KAWD3+?
MAX6726KAWD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6726KAWD3+ 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 MAX6726KAWD3+?
For technical support, including MAX6726KAWD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6726KAWD3+ requirements.
6.How does Aetrix verify that MAX6726KAWD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6726KAWD3+ 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 MAX6726KAWD3+ meets industry standards.
7.What is the process for return or replacement of MAX6726KAWD3+?
All MAX6726KAWD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6726KAWD3+, 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 MAX6726KAWD3+ part is unused and in its original packaging.
Return procedure for MAX6726KAWD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6726KAWD3+ Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
