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Analog Devices Inc./Maxim Integrated MAX6730UTRD3-T
- Part No.:
- MAX6730UTRD3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6730UTRD3-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,321
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Product details
Overview
MAX6730UTRD3-T from Maxim Integrated is a single-voltage microprocessor supervisory IC with factory-set reset threshold (+2.625V), 210ms reset timeout, active-low open-drain reset output, and independent watchdog timer. It monitors VCC1 supply voltage, asserts reset on undervoltage or manual trigger, and supports system reliability in battery-powered embedded controllers requiring guaranteed reset validity down to +0.8V.
For engineers reviewing the MAX6730UTRD3-T datasheet, MAX6730UTRD3-T pinout, MAX6730UTRD3-T application, or MAX6730UTRD3-T equivalent, this page delivers verified specifications, exact pin functions, real-world use cases, and two validated alternative parts - all confirmed for the precise MAX6730UTRD3-T variant, including its SOT23-6 package, R=+2.625V VCC1 threshold, D3=140–280ms timeout, and open-drain RST/WDO outputs.
Technical Context
The MAX6730UTRD3-T implements a dual-mode watchdog timer: a 35s minimum startup delay after reset enables full system initialization, followed by a 1.12s minimum normal-mode timeout for rapid fault detection. Its reset circuitry guarantees valid RST assertion down to VCC1 = +0.8V, with 0.5% threshold hysteresis and immunity to sub-100ns VCC transients.
This variant monitors only VCC1 (no VCC2 or RSTIN inputs), uses an internal 50kΩ MR pullup, and features open-drain RST and WDO outputs requiring external pullups. It draws just 14µA typical supply current at +3.6V and operates across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +2.625V (factory-set falling threshold; ±75mV tolerance over temp) |
| Reset Timeout Period | 140–280ms (D3 suffix; ensures sufficient hold time for µP boot sequence) |
| Supply Current | 14µA typ at +3.6V (enables multi-year operation in coin-cell-powered systems) |
| Watchdog Startup Delay | 35s min after reset (allows complex firmware initialization before watchdog monitoring begins) |
| Watchdog Normal Timeout | 1.12s min (detects software lockup within tight timing margins) |
| RST Output Type | Active-low open-drain (requires external pullup; compatible with bidirectional µP reset pins) |
| Operating Temperature | –40°C to +85°C (fully specified for industrial-grade embedded deployment) |
Pinout & Package
MAX6730UTRD3-T is housed in a 6-pin SOT23-6 package (U6-1 outline), footprint-compatible with industry-standard 0.95mm pitch land pattern 90-0175. The compact 2.9mm × 1.6mm × 1.1mm body supports high-density PCB layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output; asserts when VCC1 < +2.625V or MR pulled low; requires external pullup resistor |
| 2 | GND | Ground reference for all internal comparators and logic; must be low-impedance connection |
| 3 | WDO | Active-low open-drain watchdog output; asserts if no WDI edge occurs within 1.12s (normal mode) or 35s (startup mode) |
| 4 | MR | Active-low manual reset input; internally pulled up to VCC1 (50kΩ); drives RST low when asserted |
| 5 | WDI | Watchdog input; rising or falling edge clears watchdog timer; unconnected = watchdog remains active |
| 6 | VCC1 | Primary supply input; powers device and feeds VCC1 monitor; valid operating range +0.8V to +5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Set VCC1 Threshold | +2.625V (R-suffix) eliminates external resistor network; reduces BOM count and layout area |
| Dual-Mode Watchdog Timer | 35s startup + 1.12s normal timeout enables safe boot and responsive runtime fault detection |
| Guaranteed Reset Validity | RST remains functional down to VCC1 = +0.8V - critical for brownout recovery in low-VDD systems |
| Immunity to Short VCC Transients | Rejects <100ns glitches (per Typical Operating Characteristics), preventing spurious resets |
| Low Supply Current | 14µA typical at +3.6V supports >10-year battery life in always-on monitoring applications |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered glucose meter with ARM Cortex-M0 MCU requiring reliable power-on reset and lockup recovery during sensor calibration. IC Role / Device Role / Timing Role: Single-supply supervisor monitoring +2.625V VCC1 rail; provides 210ms reset pulse and independent watchdog supervision of firmware execution. Use Value: Prevents corrupted sensor readings by guaranteeing clean reset at power-up and detecting hung calibration routines via WDI monitoring. |
Use Scenario: DIN-rail mounted digital input module operating from +24V DC converted to +3.3V, exposed to EMI and voltage sags in factory environments. IC Role / Device Role / Timing Role: VCC1 supervisor for +3.3V logic rail; asserts RST on brownout and enables watchdog recovery without host processor intervention. Use Value: Maintains deterministic I/O state during line disturbances using 0.5% hysteresis and transient-immune reset detection. |
| Smart Energy Meters | Point-of-Sale Terminals |
|
Use Scenario: ANSI C12.22-compliant electricity meter with dual-power sources (battery backup + mains-derived +3.3V), needing fail-safe reset coordination. IC Role / Device Role / Timing Role: Primary supply monitor for main +3.3V rail; triggers reset and watchdog action when mains dropout causes VCC1 sag below +2.625V. Use Value: Ensures meter firmware restarts cleanly after power interruption, preserving billing integrity and communication session state. |
Use Scenario: EMV-compliant payment terminal with ARM-based SoC, where secure boot and runtime integrity are enforced by hardware watchdog. IC Role / Device Role / Timing Role: Standalone watchdog supervisor tied to SoC's WDI pin; provides 1.12s timeout to catch stalled cryptographic operations or card-reader stalls. Use Value: Enforces PCI PTS compliance by guaranteeing automatic recovery from frozen states without user intervention or external reset circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6730UTSD3-T | VCC1 threshold = +2.925V (S-suffix); otherwise identical pinout, timing, and features | Suitable where system VCC1 nominal is +3.0V instead of +2.7V; same SOT23-6 package and D3 timeout | Select when design uses +3.0V rail and requires tighter margin above +2.925V threshold |
| TLV803EC26DBZR | Single-supply supervisor with +2.63V threshold, 200ms timeout, push-pull RST, no watchdog output | Lacks independent watchdog timer and WDO pin; suitable only for basic reset-only applications | Choose only if watchdog functionality is omitted from system architecture and push-pull RST is preferred |
Compared with MAX6730UTRD3-T, MAX6730UTSD3-T offers a higher reset threshold for +3.0V systems but identical watchdog capability, while TLV803EC26DBZR sacrifices watchdog supervision entirely for lower cost and simpler integration in non-critical reset-only roles.
Availability
MAX6730UTRD3-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and point-of-sale terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6730UTRD3-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, emphasizing high reliability and low power.
The MAX6730–MAX6735 family targets microprocessor-based systems needing robust, multi-rail voltage monitoring and autonomous watchdog recovery - especially in space-constrained, battery-operated, or harsh-environment applications.
FAQ
What is the exact VCC1 reset threshold voltage for MAX6730UTRD3-T?
The MAX6730UTRD3-T has a factory-set VCC1 reset threshold of +2.625V (R-suffix), with guaranteed tolerance of +2.550V to +2.700V over –40°C to +85°C. This value is fixed and cannot be adjusted externally, making it ideal for systems with a nominal +2.7V supply rail where precise undervoltage detection is required.
Does MAX6730UTRD3-T support dual-voltage monitoring?
No, MAX6730UTRD3-T monitors only VCC1. It belongs to the MAX6730/MAX6731 single-voltage subgroup and lacks VCC2 and RSTIN pins. Dual-voltage supervision requires MAX6732–MAX6733 (two fixed thresholds) or MAX6734–MAX6735 (two fixed + one adjustable), which use different pinouts and packages.
What is the function of the WDO pin on MAX6730UTRD3-T?
The WDO pin on MAX6730UTRD3-T is an active-low open-drain watchdog output that asserts low if no edge is detected on WDI within the watchdog timeout period (1.12s normal mode or 35s startup mode). It operates independently of the RST output and can be used to trigger secondary system actions - such as disabling power stages or logging faults - without resetting the entire µP.
Can MAX6730UTRD3-T operate with VCC1 below 1.0V?
Yes, MAX6730UTRD3-T guarantees valid reset assertion down to VCC1 = +0.8V, per Electrical Characteristics table. However, the device ceases functional operation below +0.8V, and RST output behavior is not specified below this voltage. For operation near 0V, a 100kΩ pulldown resistor is recommended - though this does not apply to open-drain RST outputs like MAX6730UTRD3-T.
Is MAX6730UTRD3-T pin-compatible with other MAX6730 variants?
Yes, all MAX6730 variants (e.g., MAX6730UTLD3-T, MAX6730UTSD3-T) share the same SOT23-6 package and identical pinout. Differences are limited to factory-set VCC1 threshold (L=+4.625V, S=+2.925V, R=+2.625V) and reset timeout (D1–D6), with no changes to pin function, electrical interface, or thermal characteristics.
MAX6730UTRD3-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:
- 2.625V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX6730UTRD3-T FAQ
1.How can I place an order for MAX6730UTRD3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6730UTRD3-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 MAX6730UTRD3-T reliable?
The price and inventory of MAX6730UTRD3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6730UTRD3-T is usually 5 days.
3.What payment methods are accepted for MAX6730UTRD3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6730UTRD3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6730UTRD3-T?
MAX6730UTRD3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6730UTRD3-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 MAX6730UTRD3-T?
For technical support, including MAX6730UTRD3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6730UTRD3-T requirements.
6.How does Aetrix verify that MAX6730UTRD3-T is sourced from the original manufacturer or authorized distributors?
All MAX6730UTRD3-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 MAX6730UTRD3-T meets industry standards.
7.What is the process for return or replacement of MAX6730UTRD3-T?
All MAX6730UTRD3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6730UTRD3-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 MAX6730UTRD3-T part is unused and in its original packaging.
Return procedure for MAX6730UTRD3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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