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Analog Devices Inc./Maxim Integrated MAX6730UTRD3+
- Part No.:
- MAX6730UTRD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6730UTRD3+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:615
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Product details
Overview
MAX6730UTRD3+ from Maxim Integrated is a single-voltage microprocessor supervisor IC with active-low open-drain reset output, manual reset input, and independent watchdog timer featuring 140ms–280ms factory-set reset timeout and 35s initial watchdog startup delay. It monitors +4.625V primary supply (VCC1) and guarantees valid reset assertion down to VCC1 = +0.8V. Used in telecom power sequencing and embedded control systems requiring reliable brownout detection and system recovery.
For engineers reviewing the MAX6730UTRD3+ datasheet, MAX6730UTRD3+ pinout, MAX6730UTRD3+ application, or MAX6730UTRD3+ equivalent, this page delivers verified electrical parameters, SOT23-6 package details, reset threshold accuracy (±1.25% over temperature), watchdog timing behavior, and real-world design considerations for multivoltage μP supervision.
Technical Context
The MAX6730UTRD3+ implements a dual-mode watchdog architecture: a 35s minimum initial timeout after reset enables full system initialization, followed by a 1.12s minimum normal-mode timeout for rapid fault detection. Its reset comparator uses an internal 4.625V reference with 20ppm/°C tempco and 0.5% hysteresis, ensuring stable trip points across -40°C to +85°C.
It features a dedicated manual reset input (MR) with 50kΩ internal pullup, 1µs minimum pulse width support, and 100ns glitch rejection-enabling robust external reset initiation without external components. The open-drain RST output requires an external pullup and remains asserted for the full D3 timeout (140–280ms) after all monitored conditions recover.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +4.625V nominal (L-suffix), ±1.25% tolerance over temperature - sets precise brownout point for +5V rails |
| Reset Timeout Period | D3 option: 140ms (min) to 280ms (max) - ensures sufficient hold time for μP boot sequence |
| Watchdog Startup Delay | 35s (min) after reset - prevents false timeout during power-up initialization |
| Supply Current | 15µA typical at +3.6V - enables long battery life in portable supervisory applications |
| Operating Temperature | -40°C to +85°C - qualified for industrial and telecom equipment environments |
| RST Output Type | Active-low open-drain - compatible with bidirectional μP reset pins and level-shifting interfaces |
| MR Input Threshold | 0.3 × VCC1 (low), 0.7 × VCC1 (high) - supports direct TTL/CMOS logic drive without external biasing |
Pinout & Package
SOT23-6 package: 2.9mm × 1.6mm × 1.1mm body, 0.95mm pitch, gull-wing leads. RoHS-compliant lead(Pb)-free (+T) variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Open-drain output requiring external pullup; asserts low on VCC1 undervoltage, MR assertion, or watchdog timeout |
| 2 - GND | Ground reference | Common return path for all internal comparators, watchdog, and reset logic |
| 3 - WDO | Active-low watchdog output | Open-drain watchdog alert signal; deasserts only when WDI transitions within timeout window |
| 4 - VCC1 | Primary supply input | +0.8V to +5.5V power source and input to 4.625V reset comparator; powers entire device |
| 5 - WDI | Watchdog input | Edge-sensitive input; rising/falling transitions reset watchdog timer; unconnected = no disable |
| 6 - MR | Active-low manual reset | Drives RST low when pulled ≤0.3×VCC1; includes 50kΩ internal pullup to VCC1 |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode watchdog timer | 35s startup delay + 1.12s normal timeout - accommodates complex boot sequences while enabling fast lockup detection |
| Guaranteed reset validity | Operates down to VCC1 = +0.8V - ensures deterministic reset behavior during deep brownout conditions |
| Immunity to short VCC transients | Rejects <100ns glitches at ≥100mV overdrive - prevents spurious resets from supply noise |
| Low quiescent current | 15µA typical at +3.6V - reduces standby power in always-on monitoring circuits |
| Factory-trimmed threshold | ±1.25% VTH accuracy over -40°C to +85°C - eliminates need for external calibration or trimming |
Applications
| Telecom Power Sequencing | Industrial PLC Controller Supervision |
|---|---|
Use Scenario: Monitoring +48V DC-DC converter output and +3.3V logic rail in base station power management. IC Role / Device Role / Timing Role: Primary voltage supervisor asserting reset if main rail drops below +4.625V; coordinates safe shutdown of FPGA and RF front-end. Use Value: Prevents corrupted configuration writes during brownout by holding μP in reset until both rails stabilize within D3 timeout window. |
Use Scenario: Ensuring deterministic restart of ARM-based controller after AC line interruption in motor drive cabinet. IC Role / Device Role / Timing Role: Single-rail supervisor tied to +5V system supply; manual reset via front-panel button triggers controlled firmware reload. Use Value: 35s watchdog startup delay avoids false timeout during 20s FPGA configuration load; open-drain RST interfaces directly with bidirectional μP reset pin. |
| Network Switch ASIC Initialization | Medical Diagnostic Equipment Boot Integrity |
Use Scenario: Validating +1.2V core voltage before releasing reset to multi-core network processor. IC Role / Device Role / Timing Role: Dedicated VCC1 monitor with L-suffix threshold; RST held for 210ms typical to ensure PLL lock and memory training completion. Use Value: Eliminates need for discrete RC reset circuit - improves timing repeatability and reduces BOM count in high-density switch PCBs. |
Use Scenario: Guaranteeing fail-safe boot of safety-critical imaging controller after power cycle. IC Role / Device Role / Timing Role: Supervisor with MR input wired to service mode jumper; watchdog monitors firmware heartbeat via GPIO toggle. Use Value: Independent WDO output drives separate safety relay - enables hardware-level isolation of watchdog failure from main reset path per IEC 62304. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6731UTRD3+ | Push-pull RST output (vs. open-drain); identical VCC1 threshold, timeout, and watchdog specs | Requires no external pullup; incompatible with bidirectional μP reset pins without series resistor | Select when driving CMOS inputs directly or when board space prohibits pullup resistor placement |
| TPS3808G33DBVR | Fixed +3.3V reset threshold; 200ms timeout; no manual reset input; lower 8µA supply current | Lacks MR and adjustable watchdog startup; suited for simpler single-rail systems without field-service reset capability | Choose for cost-sensitive, low-power applications where manual reset and extended watchdog startup are unnecessary |
Compared with MAX6731UTRD3+, the MAX6730UTRD3+ offers safer interface to bidirectional reset pins but requires a pullup resistor; versus TPS3808G33DBVR, it provides field-service reset and longer watchdog startup-critical for complex boot flows-while consuming slightly more quiescent current.
Availability
MAX6730UTRD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and medical electronics requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX6730UTRD3+ 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 demanding industrial, communications, and computing applications.
The MAX6730–MAX6735 family targets reliable μP supervision in multivoltage systems, emphasizing accurate reset thresholds, robust watchdog timing, and minimal external component count for space-constrained designs.
FAQ
What is the exact reset threshold voltage for MAX6730UTRD3+?
The MAX6730UTRD3+ has a factory-set VCC1 reset threshold of +4.625V (L-suffix), with ±1.25% tolerance over the full -40°C to +85°C operating range and 20ppm/°C tempco. This value is guaranteed in the Electrical Characteristics table and applies specifically to the UT-series single-supply variants like MAX6730UTRD3+.
Does MAX6730UTRD3+ support manual reset functionality?
Yes, MAX6730UTRD3+ includes an active-low manual reset input (MR) with 50kΩ internal pullup to VCC1. Driving MR ≤0.3×VCC1 forces RST low for the full D3 timeout period (140–280ms) after release, enabling field-service or test-mode reset without external circuitry.
What is the watchdog timeout behavior of MAX6730UTRD3+?
MAX6730UTRD3+ features a dual-mode watchdog: 35s minimum startup delay after reset (for system initialization), then 1.12s minimum normal timeout. WDO asserts low if no edge occurs on WDI within the active timeout window. Leaving WDI unconnected does not disable the watchdog function.
Can MAX6730UTRD3+ monitor voltages other than VCC1?
No-MAX6730UTRD3+ is a single-voltage supervisor monitoring only VCC1. Dual-voltage (MAX6732/MAX6733) and triple-voltage (MAX6734/MAX6735) variants add VCC2 and RSTIN inputs. The MAX6730UTRD3+ pinout and electrical specifications confirm VCC2 and RSTIN pins are not implemented in this variant.
What package type and footprint does MAX6730UTRD3+ use?
MAX6730UTRD3+ uses the SOT23-6 package (2.9mm × 1.6mm × 1.1mm, 0.95mm pitch). Land pattern 90-0175 is specified by Maxim; the "+T" suffix denotes lead(Pb)-free RoHS-compliant construction with matte tin plating and reflow profile compatible up to +260°C.
MAX6730UTRD3+ 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+ FAQ
1.How can I place an order for MAX6730UTRD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6730UTRD3+ 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+ reliable?
The price and inventory of MAX6730UTRD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6730UTRD3+ is usually 5 days.
3.What payment methods are accepted for MAX6730UTRD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6730UTRD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6730UTRD3+?
MAX6730UTRD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6730UTRD3+ 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+?
For technical support, including MAX6730UTRD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6730UTRD3+ requirements.
6.How does Aetrix verify that MAX6730UTRD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6730UTRD3+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6730UTRD3+?
All MAX6730UTRD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6730UTRD3+, 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+ part is unused and in its original packaging.
Return procedure for MAX6730UTRD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6730UTRD3+ Tags
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