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Analog Devices Inc./Maxim Integrated MAX6731UTVD3+
- Part No.:
- MAX6731UTVD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6731UTVD3+.pdf
- Description:
- SINGLE-VOLTAGE MICROPROCESSOR SU
- Quantity:
- Payment:
- Shipping:
Inventory:1,906
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Product details
Overview
The MAX6731UTVD3+ from Maxim Integrated is a single-voltage microprocessor supervisor IC with active-low push-pull reset output, manual reset input, and independent watchdog timer featuring 1.68s normal-mode timeout and 54s startup delay. It monitors VCC1 at factory-set +3.075V threshold (suffix 'V'), provides 210ms typical reset timeout (D3), and operates over –40°C to +85°C for reliable power-on reset in embedded control systems.
For engineers reviewing the MAX6731UTVD3+ datasheet, MAX6731UTVD3+ pinout, MAX6731UTVD3+ application, or MAX6731UTVD3+ equivalent, this device delivers deterministic reset assertion during brownout, precise voltage monitoring for primary supply rails, integrated watchdog supervision without external timing components, and low 14µA supply current for battery-sensitive designs.
Technical Context
The MAX6731UTVD3+ integrates a precision voltage comparator for VCC1 monitoring with ±0.5% hysteresis and 20ppm/°C tempco, a digital reset timeout counter with six selectable periods (1.1–1120ms), and a dual-mode watchdog timer that transitions from 54s initial startup delay to 1.68s normal operation after first WDI edge detection. Its push-pull RST output drives directly into µP reset pins without pull-up resistors.
It features a dedicated manual reset input (MR) with internal 50kΩ pullup and 200ns MR-to-RST propagation delay, and an independent watchdog output (WDO) with identical push-pull drive strength as RST. All logic thresholds scale with VCC1 (0.3×/0.7×), ensuring compatibility across 0.8V–5.5V supply ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | +3.075V (factory-set 'V' suffix; ensures reliable reset assertion when primary supply drops below nominal 3.3V rail) |
| Reset Timeout | 140–280ms (D3 option; guarantees minimum system initialization time before release of reset signal) |
| Watchdog Timeout | 1.12–2.24s (normal mode); 35–72s (startup mode); prevents lockup during boot and runtime execution errors |
| Supply Current | 14µA typical at +3.6V; enables multi-year operation in coin-cell–powered supervisory applications |
| Operating Temp | –40°C to +85°C; validated for industrial and telecom equipment environments without derating |
| Output Type | Push-pull RST and WDO; eliminates need for external pull-up resistors and supports direct µP reset pin drive |
| MR Input | Active-low with 50kΩ internal pullup; accepts TTL/CMOS levels and enables momentary switch interface without debounce circuitry |
Pinout & Package
MAX6731UTVD3+ uses a 6-pin SOT23-6 package (outline 21-0058) with 1.6mm × 2.9mm footprint and 0.95mm height, optimized for space-constrained PCB layouts in portable and networking gear.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST | Active-low reset output | Push-pull driver asserts low during VCC1 undervoltage, MR assertion, or watchdog timeout; releases high after timeout expires |
| GND | Ground reference | Common return path for all internal comparators, timers, and output drivers; must be low-impedance connection |
| WDO | Active-low watchdog output | Independent push-pull output signals processor lockup; deasserts immediately when valid WDI edge detected |
| VCC1 | Primary supply input | Powers device and feeds VCC1 monitor; threshold set to +3.075V; valid operation down to +0.8V |
| WDI | Watchdog input | Edge-sensitive input; rising/falling transitions reset watchdog timer; unconnected state does not disable function |
| MR | Manual reset input | Active-low input with internal 50kΩ pullup to VCC1; forces reset when driven low; 1µs minimum pulse width |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode watchdog timer | 54s startup delay enables full system boot before watchdog enforcement; 1.68s runtime timeout detects software hangs |
| Guaranteed reset validity | Operates correctly down to VCC1 = +0.8V; ensures reset integrity during deep brownout conditions |
| Immunity to VCC transients | Rejects short-duration supply glitches via internal hysteresis and timing filters; prevents spurious resets |
| Low quiescent current | 14µA typical at +3.6V; reduces standby power in always-on supervisory circuits |
| Scalable logic thresholds | MR and WDI thresholds track VCC1 (0.3×/0.7×), maintaining noise margin across wide supply range |
Applications
| Industrial PLC Control | Network Router Power Management |
|---|---|
Use Scenario: Supervises 3.3V CPU core and 1.2V I/O rails in programmable logic controller modules deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Primary voltage supervisor providing power-on reset, brownout detection, and watchdog supervision for ARM-based controller. Use Value: Ensures deterministic boot sequence and recovers locked firmware without operator intervention using MR button or WDI-driven watchdog timeout. |
Use Scenario: Monitors main 3.3V switching regulator output in enterprise-grade Ethernet routers operating 24/7 in temperature-controlled datacom environments. IC Role / Device Role / Timing Role: Single-rail supervisor with push-pull RST driving FPGA configuration reset and WDO signaling host processor health. Use Value: Eliminates external pull-up resistors on reset lines, reduces BOM count, and maintains reset assertion during 100ms AC dropout events. |
| Medical Diagnostic Handheld | POS Terminal Boot Integrity |
Use Scenario: Provides reset and watchdog functions in battery-powered ultrasound probe with ARM Cortex-M4 MCU and analog front-end. IC Role / Device Role / Timing Role: Low-power supervisor enabling >5-year shelf life; MR input used for field-service hard reset. Use Value: 14µA supply current extends battery life; push-pull outputs interface directly with µP reset pin without leakage concerns. |
Use Scenario: Ensures reliable boot of payment terminal running Linux on i.MX6 SoC, where corrupted bootloader may halt at early stage. IC Role / Device Role / Timing Role: Supervisor asserting reset if 3.3V rail fails during U-Boot execution or if watchdog timer expires due to kernel panic. Use Value: D3 timeout (210ms) matches typical DDR initialization window; WDO connected to SoC's external reset pin for autonomous recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6730UTVD3+ | Open-drain RST output; requires external pull-up resistor; identical VCC1 threshold and D3 timeout | Suitable where µP reset pin is open-drain compatible or level translation is needed | Select MAX6730UTVD3+ only when board layout already includes pull-up or when interfacing with legacy µPs requiring open-drain reset signaling |
| TPS3808G33DBVR | Single-supply supervisor with 3.3V fixed threshold; 200ms reset timeout; no manual reset input; no watchdog output | Lacks MR and independent WDO; intended for simpler reset-only use cases | Choose TPS3808G33DBVR only when watchdog and manual reset functions are unnecessary and footprint compatibility with SOT23-6 is required |
Compared with MAX6730UTVD3+, the MAX6731UTVD3+ eliminates external pull-up components and simplifies µP interface, while TPS3808G33DBVR reduces feature count and cost but sacrifices system-level fault recovery capability.
Availability
MAX6731UTVD3+ is available at Aetrix Electronics and suitable for industrial PLC control, network router power management, medical diagnostic handhelds, and POS terminal boot integrity requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6731UTVD3+ 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, communications, and computing applications, with emphasis on reliability and integration.
The MAX6731UTVD3+ belongs to the MAX6730–MAX6735 family of microprocessor supervisors engineered for robust power-on reset, brownout protection, and autonomous watchdog recovery in resource-constrained embedded systems.
FAQ
What is the factory-set VCC1 reset threshold voltage for MAX6731UTVD3+?
The MAX6731UTVD3+ has a factory-set VCC1 reset threshold of +3.075V, indicated by the 'V' suffix in its part number. This value is guaranteed over –40°C to +85°C with ±0.5% hysteresis and 20ppm/°C tempco, ensuring accurate detection of 3.3V rail brownout conditions without external calibration.
Does MAX6731UTVD3+ include a manual reset input and how is it implemented?
Yes, MAX6731UTVD3+ includes an active-low manual reset input (MR) with an internal 50kΩ pullup resistor to VCC1. Driving MR low forces immediate RST assertion and clears the watchdog timer. The input accepts standard TTL/CMOS logic levels and requires only a 1µs minimum pulse width, enabling simple momentary switch implementation without external debounce circuitry.
What are the watchdog timeout periods supported by MAX6731UTVD3+?
MAX6731UTVD3+ features a dual-mode watchdog timer: a 35–72s minimum startup delay after reset to allow full system initialization, followed by a 1.12–2.24s minimum normal-mode timeout during runtime operation. The watchdog is edge-triggered on WDI and remains active even if WDI is left unconnected, ensuring continuous supervision.
How does the push-pull RST output of MAX6731UTVD3+ differ from open-drain alternatives?
The push-pull RST output of MAX6731UTVD3+ actively drives both high and low states, eliminating the need for external pull-up resistors. This reduces component count, improves noise immunity on reset lines, and ensures fast, deterministic release of reset without relying on RC time constants-critical for tight-tolerance boot timing in modern µPs and FPGAs.
Is MAX6731UTVD3+ suitable for operation at low supply voltages?
Yes, MAX6731UTVD3+ guarantees valid reset operation down to VCC1 = +0.8V, with full functionality-including reset assertion, watchdog timing, and MR response-maintained across its entire specified supply range of +0.8V to +5.5V. This makes it suitable for brownout detection in battery-powered and energy-harvesting systems.
MAX6731UTVD3+ 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:
- 3.075V
- 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
MAX6731UTVD3+ FAQ
1.How can I place an order for MAX6731UTVD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6731UTVD3+ 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 MAX6731UTVD3+ reliable?
The price and inventory of MAX6731UTVD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6731UTVD3+ is usually 5 days.
3.What payment methods are accepted for MAX6731UTVD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6731UTVD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6731UTVD3+?
MAX6731UTVD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6731UTVD3+ 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 MAX6731UTVD3+?
For technical support, including MAX6731UTVD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6731UTVD3+ requirements.
6.How does Aetrix verify that MAX6731UTVD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6731UTVD3+ 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 MAX6731UTVD3+ meets industry standards.
7.What is the process for return or replacement of MAX6731UTVD3+?
All MAX6731UTVD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6731UTVD3+, 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 MAX6731UTVD3+ part is unused and in its original packaging.
Return procedure for MAX6731UTVD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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