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Analog Devices Inc./Maxim Integrated MAX6730UTLD3
- Part No.:
- MAX6730UTLD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6730UTLD3.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:1,694
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Product details
Overview
MAX6730UTLD3 from Maxim Integrated is a single-voltage microprocessor supervisor IC with active-low open-drain reset output, factory-set +4.625V VCC1 reset threshold, 140–280ms reset timeout, watchdog timer with 35s startup delay and 1.12s normal timeout, and manual reset input. It monitors primary supply voltage in embedded systems requiring reliable power-on reset and fault detection during brownout or software lockup.
For engineers reviewing the MAX6730UTLD3 datasheet, MAX6730UTLD3 pinout, MAX6730UTLD3 application, or MAX6730UTLD3 equivalent, this page delivers verified specifications, SOT23-6 package details, reset timing behavior, watchdog startup/normal mode operation, and direct alternatives for multivoltage supervisory design.
Technical Context
The MAX6730UTLD3 implements a dual-mode watchdog timer: a 35s (min) initial timeout after reset enables full system initialization, followed by a 1.12s (min) normal timeout for rapid fault detection. Its reset circuitry guarantees valid RST assertion down to VCC1 = +0.8V and features 20ppm/°C threshold tempco with 0.5% hysteresis.
It uses an internal 626mV reference for VCC1 monitoring (no adjustable RSTIN), supports TTL/CMOS-level MR input with 50kΩ internal pullup, and provides immunity to short VCC transients - tolerating up to ~10µs glitches at 100mV overdrive per typical characterization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +4.625V nominal (LT suffix); ensures reliable reset assertion when main supply drops below logic-safe level for 5V/3.3V systems |
| Reset Timeout Period | 140–280ms (D3 suffix); holds reset active long enough for µP clock stabilization and register initialization |
| Watchdog Timeout | 35s min startup delay, then 1.12s min normal timeout; prevents premature reset during boot while catching runtime hangs |
| Supply Current | 14µA typical at +3.6V; enables use in battery-backed or low-power always-on supervision circuits |
| Operating Temperature | -40°C to +85°C; qualified for industrial-grade embedded equipment without derating |
| Reset Output Type | Active-low open-drain; requires external pullup but interfaces directly with bidirectional µP reset pins |
| MR Input Logic | VIL ≤ 0.3×VCC1, VIH ≥ 0.7×VCC1; compatible with standard CMOS/TTL drivers and momentary switches |
Pinout & Package
SOT23-6 package (6-pin, 1.6mm × 2.9mm footprint), lead-free compatible, rated for -40°C to +85°C operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output; asserts when VCC1 falls below +4.625V, MR is pulled low, or watchdog expires |
| 2 | GND | Ground reference for all internal comparators and outputs; must be low-impedance connection to system ground plane |
| 3 | WDO | Active-low open-drain watchdog output; asserts independently of RST when WDI lacks transitions for >1.12s (normal mode) |
| 4 | MR | Active-low manual reset input; internally pulled up to VCC1 (50kΩ); drives RST low when asserted |
| 5 | WDI | Watchdog input; edge-sensitive (rising/falling); clears watchdog timer on each valid transition |
| 6 | VCC1 | Primary supply input; powers device and feeds +4.625V reset comparator; valid from +0.8V to +5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode watchdog timer | 35s startup delay enables full system boot before watchdog enforcement begins; avoids false timeouts during initialization |
| Guaranteed reset validity down to VCC1 = +0.8V | Ensures clean reset assertion even during deep brownout conditions where supply recovers slowly |
| Immunity to short VCC transients | Tolerates falling supply glitches ≤10µs at 100mV overdrive - eliminates spurious resets from switching noise or load transients |
| Low 14µA supply current | Minimizes quiescent drain in always-powered supervision paths, critical for battery-operated or energy-harvesting systems |
| Internal 50kΩ MR pullup | Eliminates need for external pullup resistor; simplifies PCB layout and reduces BOM count for manual reset implementation |
Applications
| Industrial PLC Controller | Network Router Power Management |
|---|---|
Use Scenario: Supervises 5V main rail and 3.3V I/O rail in programmable logic controller with real-time OS and fieldbus interfaces. IC Role / Device Role / Timing Role: Single-supply supervisor (VCC1 only) providing power-on reset, brownout detection, and software watchdog for CPU core. Use Value: Prevents corrupted firmware execution during unstable AC/DC converter startup or line sags; 140–280ms timeout aligns with FPGA configuration time. | Use Scenario: Monitors primary 5V supply in enterprise-grade router with multiple PHYs, switch fabric, and PoE management. IC Role / Device Role / Timing Role: Dedicated VCC1 supervisor triggering hard reset if main DC-DC output collapses during thermal throttling or overload. Use Value: Open-drain RST interfaces natively with bidirectional µP reset pins; 35s watchdog startup avoids timeout during multi-stage bootloader execution. |
| Medical Diagnostic Handheld | Smart Energy Meter |
Use Scenario: Ensures deterministic boot sequence in battery-powered ultrasound probe with ARM Cortex-M4 and analog front-end. IC Role / Device Role / Timing Role: Primary supply monitor for 3.3V LDO output feeding processor and ADC; manual reset for field service recovery. Use Value: 14µA quiescent current extends battery life between calibrations; MR input allows technician-initiated reset without power cycle. | Use Scenario: Supervises 3.3V microcontroller supply in ANSI C12.22-compliant meter with RF mesh networking and tamper detection. IC Role / Device Role / Timing Role: Fault-tolerant reset generator with independent watchdog output tied to safety-critical watchdog timer in MCU. Use Value: Dual-mode watchdog (35s boot + 1.12s runtime) meets IEC 62056-21 reliability requirements for unattended operation over 15-year lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR29D3-T | Single-voltage supervisor with +2.93V reset threshold, 200ms timeout, no watchdog or MR input | Lacks watchdog timer and manual reset; suitable only for basic power-on reset without runtime fault coverage | Select when watchdog functionality is unnecessary and lower reset threshold is required for 3.3V systems |
| TPS3808G33DBVR | +3.3V reset threshold, 200ms timeout, push-pull RST, no MR input, watchdog with 1.6s timeout | Push-pull output requires series resistor for bidirectional µP pins; no manual reset capability | Choose for TI-based designs needing integrated enable control and tighter reset threshold accuracy (±0.5%) |
Compared with MAX6730UTLD3, MAX6326UR29D3-T omits critical runtime protection (watchdog/MR), while TPS3808G33DBVR trades manual reset for push-pull drive and offers higher precision but less flexible timing architecture.
Availability
MAX6730UTLD3 is available at Aetrix Electronics and suitable for industrial PLC controllers, network routers, medical handhelds, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6730UTLD3 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, mixed-signal, and power management ICs for industrial, computing, and communications applications.
The MAX6730–MAX6735 family targets embedded systems needing multivoltage supervision with independent watchdog capability - optimized for reliability in telecom infrastructure, servers, and portable equipment.
FAQ
What is the exact reset threshold voltage for MAX6730UTLD3?
The MAX6730UTLD3 has a factory-set VCC1 reset threshold of +4.625V (LT suffix), with ±125mV tolerance over temperature. This value is guaranteed across the full -40°C to +85°C operating range and includes 0.5% hysteresis to prevent chatter near the trip point. The threshold is referenced to an internal bandgap and exhibits 20ppm/°C tempco.
Does MAX6730UTLD3 support manual reset functionality?
Yes, MAX6730UTLD3 includes an active-low manual reset input (MR) on Pin 4. It features an internal 50kΩ pullup to VCC1, accepts standard CMOS/TTL logic levels, and asserts RST for the full reset timeout period after MR is released. MR pulse width must exceed 1µs, and it provides 100ns glitch rejection for noise immunity.
What is the watchdog behavior of MAX6730UTLD3 during power-up?
Upon power-up or reset assertion, MAX6730UTLD3 enters a 35s (minimum) initial watchdog mode before transitioning to the 1.12s (minimum) normal timeout period. This extended startup window allows complete system initialization - including bootloader execution and peripheral configuration - before watchdog enforcement begins, preventing false timeouts.
Can MAX6730UTLD3 monitor a secondary supply voltage like VCC2?
No, MAX6730UTLD3 is a single-voltage supervisor and monitors only VCC1. The "UT" prefix and "L" threshold suffix indicate it is part of the MAX6730/MAX6731 series, which lack VCC2 and RSTIN inputs. Dual- and triple-voltage variants (e.g., MAX6732, MAX6734) are required for monitoring additional rails.
What package type and pin count does MAX6730UTLD3 use?
MAX6730UTLD3 uses the SOT23-6 package: a 6-pin, surface-mount outline measuring 2.9mm × 1.6mm × 1.1mm. Pin 1 is marked with a dot; the pinout is standardized across the MAX6730–MAX6733 series and includes RST, GND, WDO, MR, WDI, and VCC1 terminals in that order.
MAX6730UTLD3 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 FAQ
1.How can I place an order for MAX6730UTLD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6730UTLD3 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 reliable?
The price and inventory of MAX6730UTLD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6730UTLD3 is usually 5 days.
3.What payment methods are accepted for MAX6730UTLD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6730UTLD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6730UTLD3?
MAX6730UTLD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6730UTLD3 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?
For technical support, including MAX6730UTLD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6730UTLD3 requirements.
6.How does Aetrix verify that MAX6730UTLD3 is sourced from the original manufacturer or authorized distributors?
All MAX6730UTLD3 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 meets industry standards.
7.What is the process for return or replacement of MAX6730UTLD3?
All MAX6730UTLD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6730UTLD3, 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 part is unused and in its original packaging.
Return procedure for MAX6730UTLD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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