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Analog Devices Inc./Maxim Integrated MAX6730UTLD3-T
- Part No.:
- MAX6730UTLD3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6730UTLD3-T.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6730UTLD3-T from Maxim Integrated is a single-voltage microprocessor supervisory IC with active-low open-drain reset output, factory-set 4.625V VCC1 reset threshold, 3.075V VCC2 secondary threshold, 210ms minimum reset timeout period (D3), and independent watchdog timer featuring 35s startup delay and 1.68s normal-mode timeout. It monitors primary and secondary supply rails in embedded systems requiring reliable power-on reset and lockup recovery.
For engineers reviewing the MAX6730UTLD3-T datasheet, MAX6730UTLD3-T pinout, MAX6730UTLD3-T application, or MAX6730UTLD3-T equivalent, this device delivers deterministic reset assertion under brownout, manual reset initiation, and watchdog supervision of firmware execution - all in a space-constrained SOT23-6 package with guaranteed operation down to VCC = +0.8V.
Technical Context
The MAX6730UTLD3-T implements dual-supply monitoring using precision bandgap-referenced comparators for VCC1 and VCC2, with ±0.5% hysteresis and 20ppm/°C tempco. Its reset logic asserts RST low when either supply falls below its factory-trimmed threshold and holds for the full 140–280ms D3 timeout window after recovery.
The integrated watchdog operates in two phases: a 35s (min) initialization window post-reset enables safe system boot, then transitions to 1.12s (min) normal timeout on first WDI edge detection. WDO is open-drain and shares the same assertion conditions as RST but operates independently - enabling separate reset and watchdog signaling paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +4.625V nominal (LT suffix), ±125mV tolerance - ensures clean reset assertion during 5V rail brownout without false triggering. |
| VCC2 Reset Threshold | +3.075V nominal (LT suffix), ±75mV tolerance - supports concurrent monitoring of 3.3V I/O or memory supply. |
| Reset Timeout Period | 140–280ms (D3 option) - provides sufficient hold time for slow-starting processors and peripheral initialization. |
| Watchdog Timeout | 35s min startup / 1.12s min normal mode - accommodates bootloader execution then enforces tight firmware liveness checks. |
| Supply Current | 14µA typical at +3.6V - enables use in battery-backed or ultra-low-power always-on monitoring applications. |
| Operating Temperature | -40°C to +85°C - fully specified for industrial and telecom equipment environments. |
| Reset Output Type | Active-low open-drain - allows wired-OR configuration with other reset sources and flexible pull-up voltage selection. |
Pinout & Package
MAX6730UTLD3-T is housed in a 6-pin SOT23-6 package (U6-1 outline), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant matte-tin plating. Thermal resistance θJA = 230°C/W enables operation at full rating up to +70°C ambient without heatsinking.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output - requires external pullup; asserts when VCC1/VCC2 drop below threshold or MR is pulled low. |
| 2 | GND | Analog/digital ground reference - must be connected to system ground plane with low-inductance path for noise immunity. |
| 3 | WDO | Active-low open-drain watchdog output - independent of RST; asserts if WDI lacks edge for >1.12s after boot or during undervoltage. |
| 4 | MR | Active-low manual reset input - internal 50kΩ pullup to VCC1; drives RST low when asserted, clearing watchdog counter. |
| 5 | WDI | Watchdog input - edge-sensitive (rising/falling); resets internal timer on each transition; unconnected = watchdog remains active. |
| 6 | VCC1 | Primary supply input - powers device and serves as reference for VCC1 threshold comparator; valid from +0.8V to +5.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-voltage monitoring | Simultaneous +4.625V and +3.075V thresholds eliminate need for external resistor dividers or discrete supervisors. |
| Guaranteed reset validity | Operates and asserts valid RST down to VCC1 or VCC2 = +0.8V - ensures fail-safe behavior during deep brownout conditions. |
| Immunity to short VCC transients | Rejects <10µs falling glitches at 100mV overdrive - prevents spurious resets in noisy power environments. |
| Low quiescent current | 14µA typical ICC1 at +3.6V - extends battery life in portable equipment and reduces self-heating in dense PCB layouts. |
| Manual reset with glitch rejection | 100ns MR pulse rejection and 1µs minimum width requirement - suppresses contact bounce and EMI-induced false triggers. |
Applications
| Telecom Line Card Power Monitoring | Industrial PLC CPU Board Supervision |
|---|---|
Use Scenario: Monitors +48V DC-DC derived 5V and 3.3V rails powering FPGA, PHY, and control logic on carrier-grade line cards. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting synchronized reset to FPGA and microcontroller upon any rail dropout. Use Value: Prevents partial configuration or metastability by ensuring both logic and I/O supplies stabilize before release from reset. |
Use Scenario: Embedded controller board in programmable logic controller housing harsh industrial environments with wide temperature swings. IC Role / Device Role / Timing Role: Primary reset generator with manual override button and watchdog supervision of real-time task scheduler. Use Value: Guarantees deterministic restart after brownout or software hang, meeting IEC 61131-2 reliability requirements. |
| Network Router Bootloader Protection | Medical Diagnostic Imaging Subsystem |
Use Scenario: Secures boot sequence of ARM-based network processor by validating 1.2V core and 3.3V interface supplies before loading firmware. IC Role / Device Role / Timing Role: Single-chip solution providing reset hold time, manual reset, and watchdog - all referenced to same VCC1 rail. Use Value: Eliminates risk of corrupted flash writes or incomplete register initialization due to premature release from reset. |
Use Scenario: Supervises isolated 5V analog front-end and 3.3V digital subsystem in ultrasound beamformer module. IC Role / Device Role / Timing Role: Fault-detection node that triggers system-level safety shutdown via RST signal when supply integrity is compromised. Use Value: Meets IEC 62304 Class C software safety requirements by enforcing hardware-enforced reset on power anomaly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR29D3-T | Single 2.93V fixed threshold, no VCC2 monitor, no watchdog output, push-pull RST only | Limited to single-rail systems without firmware supervision needs | Select when only basic 3V rail monitoring is required and board space permits larger SOT23-5 footprint |
| TPS3808G33DBVR | Single 3.3V threshold, adjustable timeout (1ms–10s), no secondary monitor, push-pull RST, higher 25µA ICC | Offers wider timeout flexibility but lacks dual-supply capability and independent WDO | Prefer for cost-sensitive consumer designs where 3.3V-only monitoring suffices and longer timeouts are needed |
Compared with MAX6730UTLD3-T, MAX6326UR29D3-T omits dual-supply monitoring and watchdog functionality - reducing BOM count but limiting fault coverage; TPS3808G33DBVR trades dual-rail capability for broader timeout range and higher supply current, making it suitable for simpler, lower-cost implementations without secondary rail supervision.
Availability
MAX6730UTLD3-T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and medical diagnostic equipment requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.
Supply support for MAX6730UTLD3-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 power, sensing, and connectivity applications, with emphasis on high-reliability industrial and communications markets.
The MAX6730–MAX6735 family was engineered specifically for multivoltage microprocessor systems needing simultaneous rail monitoring, deterministic reset timing, and independent watchdog supervision - targeting space-constrained, mission-critical embedded platforms.
FAQ
What is the exact reset threshold voltage for MAX6730UTLD3-T?
The MAX6730UTLD3-T has a factory-set VCC1 reset threshold of +4.625V (LT suffix) with ±125mV tolerance and a VCC2 threshold of +3.075V (also LT), both specified over -40°C to +85°C. These values are laser-trimmed during production and documented in Table 1 of the MAX6730–MAX6735 datasheet. The MAX6730UTLD3-T does not support adjustable RSTIN monitoring - that feature is exclusive to MAX6734/MAX6735 variants.
Does MAX6730UTLD3-T include a watchdog timer, and how is it configured?
Yes, MAX6730UTLD3-T integrates a dual-mode watchdog timer with independent WDO output. It starts in 35s (min) startup mode after reset to allow system boot, then switches to 1.12s (min) normal timeout after first WDI edge detection. WDO is active-low open-drain and asserts if WDI remains static beyond timeout - no external components or configuration are required to enable this function in MAX6730UTLD3-T.
What package type and footprint does MAX6730UTLD3-T use?
MAX6730UTLD3-T uses a 6-pin SOT23-6 package (package code U6-1, outline 21-0058), with 0.95mm pin pitch and gull-wing leads. Its land pattern (90-0175) is standardized across Maxim's SOT23-6 offerings. The device is RoHS-compliant and available in both leaded and lead-free versions - ordering suffix "-T" denotes lead-free; "+T" is not used for this part number per Maxim's packaging notation.
Can MAX6730UTLD3-T monitor three voltage rails?
No, MAX6730UTLD3-T monitors exactly two voltage rails: VCC1 (primary, +4.625V threshold) and VCC2 (secondary, +3.075V threshold). It does not include the RSTIN adjustable comparator input - that feature is present only in MAX6734 and MAX6735 variants (SOT23-8 packages). For triple-rail supervision, engineers must select MAX6734KALTD3-T or MAX6735KALTD3-T instead of MAX6730UTLD3-T.
Is manual reset supported on MAX6730UTLD3-T, and what are its electrical characteristics?
Yes, MAX6730UTLD3-T includes an active-low manual reset input (MR) with internal 50kΩ pullup to VCC1. MR accepts TTL/CMOS logic levels (VIH = 0.7×VCC1, VIL = 0.3×VCC1), rejects <100ns glitches, and requires ≥1µs pulse width for reliable assertion. Driving MR low forces immediate RST assertion and clears the watchdog timer - a key feature confirmed in the MAX6730UTLD3-T functional diagram and Pin Description table.
MAX6730UTLD3-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:
- 4.625V
- Output:
- Open Drain or Open Collector
- 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
MAX6730UTLD3-T FAQ
1.How can I place an order for MAX6730UTLD3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6730UTLD3-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 MAX6730UTLD3-T reliable?
The price and inventory of MAX6730UTLD3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6730UTLD3-T is usually 5 days.
3.What payment methods are accepted for MAX6730UTLD3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6730UTLD3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6730UTLD3-T?
MAX6730UTLD3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6730UTLD3-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 MAX6730UTLD3-T?
For technical support, including MAX6730UTLD3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6730UTLD3-T requirements.
6.How does Aetrix verify that MAX6730UTLD3-T is sourced from the original manufacturer or authorized distributors?
All MAX6730UTLD3-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 MAX6730UTLD3-T meets industry standards.
7.What is the process for return or replacement of MAX6730UTLD3-T?
All MAX6730UTLD3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6730UTLD3-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 MAX6730UTLD3-T part is unused and in its original packaging.
Return procedure for MAX6730UTLD3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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