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Analog Devices Inc./Maxim Integrated MAX6731UTYD3+T
- Part No.:
- MAX6731UTYD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6731UTYD3+T.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
MAX6731UTYD3+T from Maxim Integrated is a single-voltage microprocessor supervisor IC with push-pull active-low reset output, manual reset input, and independent push-pull watchdog output. It monitors VCC1 at factory-set +2.188V threshold (Y suffix), provides 140–280ms reset timeout (D3), consumes 14µA typical supply current, and operates across –40°C to +85°C - used in embedded systems requiring reliable power-on reset and software lockup recovery.
For engineers reviewing the MAX6731UTYD3+T datasheet, MAX6731UTYD3+T pinout, MAX6731UTYD3+T application, or MAX6731UTYD3+T equivalent, this page delivers verified electrical parameters, SOT23-6 package mapping, functional pin roles, real-world use cases, and two validated alternative parts - all extracted from Maxim's official documentation and confirmed for the exact part number.
Technical Context
The MAX6731UTYD3+T integrates a precision voltage monitor for VCC1 only (no VCC2 or RSTIN support), a 1.12s min normal-mode watchdog timer with 35s startup delay, and a manual reset input with internal 50kΩ pullup. Its push-pull RST and WDO outputs eliminate external pullups and support direct interfacing with microcontroller reset I/O pins when isolated via a 10kΩ resistor.
It guarantees valid reset assertion down to VCC1 = +0.8V, features 0.5% reset threshold hysteresis, and exhibits immunity to sub-100ns VCC transients. The device uses BiCMOS process technology and is fully specified over the industrial temperature range without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +2.188V (Y suffix, falling edge; ±12.5mV tolerance) |
| Reset Timeout Period | 140–280ms (D3 option; ensures sufficient hold time after power stabilization) |
| Supply Current | 14µA typical at +3.6V (enables ultra-low-power battery-backed operation) |
| Watchdog Timeout (Normal) | 1.12s minimum (detects firmware hangs within tight timing windows) |
| Watchdog Startup Delay | 35s minimum after reset (allows full system boot before watchdog enforcement) |
| Operating Temperature | –40°C to +85°C (fully specified for industrial-grade reliability) |
| Reset Output Type | Active-low push-pull (drives high/low directly; no external pullup required) |
Pinout & Package
SOT23-6 package (6-pin, 1.6mm × 2.9mm × 1.1mm body, 0.95mm pitch), lead(Pb)-free, RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Push-pull driver; asserts low on VCC1 undervoltage, MR assertion, or watchdog timeout - directly drives µP reset pin without pullup |
| 2 - GND | Ground reference | Common return path for all internal comparators, timers, and outputs; must be low-impedance |
| 3 - WDO | Active-low watchdog output | Push-pull driver; asserts low if WDI lacks edge transitions for >1.12s (normal mode) or >35s (startup mode) |
| 4 - MR | Active-low manual reset input | Internally pulled up to VCC1 (50kΩ); driven low to force reset and clear watchdog counter |
| 5 - WDI | Watchdog input | Edge-sensitive; rising or falling transition resets watchdog timer; unconnected = watchdog remains active |
| 6 - VCC1 | Primary supply input | Powers device and feeds VCC1 monitor; valid operation guaranteed down to +0.8V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set VCC1 threshold (+2.188V) | Eliminates external resistor divider; ensures precise brownout detection without calibration |
| Push-pull RST and WDO outputs | Removes need for external pullup resistors; simplifies PCB layout and reduces BOM count |
| Manual reset with internal pullup | Enables momentary switch interface without external components; supports TTL/CMOS logic drive |
| Watchdog with dual-mode timing | 35s startup delay prevents false timeout during boot; 1.12s normal mode enables rapid hang detection |
| Immunity to short VCC transients | Rejects <100ns glitches; avoids spurious resets in noisy power environments |
Applications
| Industrial Control PLCs | Network Router Power Management |
|---|---|
Use Scenario: Monitoring primary 3.3V rail in programmable logic controllers exposed to wide ambient temperature swings and EMI. IC Role / Device Role / Timing Role: Single-supply supervisor asserting reset if VCC1 drops below +2.188V during brownout or cold start. Use Value: Guarantees µP reset validity down to VCC1 = +0.8V and maintains stable operation across –40°C to +85°C. |
Use Scenario: Ensuring reliable boot sequence and runtime watchdog supervision in multi-rail telecom routers with 2.5V/3.3V/5V domains. IC Role / Device Role / Timing Role: Dedicated VCC1 monitor for main processor supply, paired with manual reset for field service and watchdog for firmware crash recovery. Use Value: Push-pull RST/WDO outputs interface directly with ARM-based SoC reset I/O; 14µA supply current minimizes standby power draw. |
| Medical Diagnostic Handhelds | POS Terminal Firmware Recovery |
Use Scenario: Battery-powered portable ultrasound devices requiring fail-safe reset during Li-ion voltage sag. IC Role / Device Role / Timing Role: Supervises main system rail (e.g., 2.2V LDO output) and triggers hardware reset before µP enters undefined state. Use Value: D3 timeout (140–280ms) aligns with typical µP power-up sequencing; low 14µA ICC extends battery life between charges. |
Use Scenario: Embedded payment terminals where corrupted firmware must trigger automatic recovery without user intervention. IC Role / Device Role / Timing Role: Watchdog monitors WDI toggling from application firmware; MR allows technician-initiated reset via front-panel button. Use Value: Dual-mode watchdog (35s boot window + 1.12s runtime) prevents premature timeout during initialization while ensuring fast hang detection post-boot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6730UTYD3+T | Open-drain RST and WDO outputs; requires external pullup resistors | Used where µP reset pin is bidirectional or open-drain compatible; higher board-level component count | Select when legacy design uses open-drain topology or shares pullup with other signals |
| MAX6733UTYD3+T | Dual-voltage monitoring (VCC1 + VCC2); same push-pull RST/WDO; no RSTIN | Required when supervising both core and I/O rails (e.g., 2.188V + 1.313V) in same device | Choose when second fixed threshold is needed - adds monitoring capability without changing footprint or timeout |
Compared with MAX6730UTYD3+T, the MAX6731UTYD3+T eliminates external pullups via push-pull outputs, reducing BOM cost and layout complexity; versus MAX6733UTYD3+T, it trades dual-voltage capability for lower cost and smaller footprint where only one rail needs supervision.
Availability
MAX6731UTYD3+T is available at Aetrix Electronics and suitable for industrial control systems, network infrastructure equipment, and portable medical devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6731UTYD3+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) designs precision analog and mixed-signal ICs for industrial, computing, and communications markets, with emphasis on reliability, integration, and low-power operation.
The MAX6730–MAX6735 family targets embedded systems needing compact, single-chip solutions for power-on reset, brownout protection, and software watchdog supervision - optimized for space-constrained, thermally demanding applications.
FAQ
What is the exact VCC1 reset threshold voltage for MAX6731UTYD3+T?
The MAX6731UTYD3+T has a factory-set VCC1 reset threshold of +2.188V (Y suffix), with ±12.5mV tolerance over temperature. This value is guaranteed per Maxim's Electrical Characteristics table and applies specifically to the Y-coded variant - not adjustable and not dependent on external components.
Does MAX6731UTYD3+T support dual-voltage monitoring?
No, MAX6731UTYD3+T monitors only VCC1. It belongs to the single-voltage MAX6730/MAX6731 subgroup and does not include VCC2 or RSTIN inputs. For dual-voltage supervision, consider MAX6732/MAX6733; for triple-voltage, use MAX6734/MAX6735.
What is the function of the WDI pin on MAX6731UTYD3+T?
The WDI (Watchdog Input) pin on MAX6731UTYD3+T is edge-sensitive: each rising or falling transition resets the internal watchdog timer. If no edge occurs for >1.12s (normal mode) or >35s (startup mode), WDO asserts low. Leaving WDI unconnected does not disable the watchdog - it remains active and will timeout.
Can MAX6731UTYD3+T operate with VCC1 below 1.0V?
Yes - MAX6731UTYD3+T guarantees valid reset assertion down to VCC1 = +0.8V. However, reset output behavior is not guaranteed below that level. For operation down to 0V, a 100kΩ pulldown resistor from RST to GND is recommended, though this configuration is incompatible with open-drain variants (not applicable here).
What package type and dimensions does MAX6731UTYD3+T use?
MAX6731UTYD3+T uses the SOT23-6 package: 6-pin, lead(Pb)-free, RoHS compliant, with 1.6mm × 2.9mm × 1.1mm body size and 0.95mm pin pitch. Land pattern reference is Maxim's outline 21-0058; thermal resistance θJA is 230°C/W on a 4-layer JEDEC board.
MAX6731UTYD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.188V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX6731UTYD3+T FAQ
1.How can I place an order for MAX6731UTYD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6731UTYD3+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 MAX6731UTYD3+T reliable?
The price and inventory of MAX6731UTYD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6731UTYD3+T is usually 5 days.
3.What payment methods are accepted for MAX6731UTYD3+T?
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4.How is shipping managed for MAX6731UTYD3+T?
MAX6731UTYD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6731UTYD3+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 MAX6731UTYD3+T?
For technical support, including MAX6731UTYD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6731UTYD3+T requirements.
6.How does Aetrix verify that MAX6731UTYD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6731UTYD3+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 MAX6731UTYD3+T meets industry standards.
7.What is the process for return or replacement of MAX6731UTYD3+T?
All MAX6731UTYD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6731UTYD3+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 MAX6731UTYD3+T part is unused and in its original packaging.
Return procedure for MAX6731UTYD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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