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Analog Devices Inc./Maxim Integrated MAX6747KA30/V+
- Part No.:
- MAX6747KA30/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6747KA30/V+.pdf
- Description:
- MICROPROCESSOR RESET CIRCUITS WI
- Quantity:
- Payment:
- Shipping:
Inventory:4,940
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Product details
Overview
MAX6747KA30/V+ from Analog Devices is a low-power microprocessor supervisory circuit with factory-trimmed 3.0V ±2% VCC reset threshold, manual-reset input (MR), push-pull active-low RESET output, and capacitor-adjustable reset timeout (5.7–9.5ms typical with 1500pF). It monitors single supply voltage (1.2V to 5.5V), provides power-supply transient immunity, and is AEC-Q100 qualified for automotive systems requiring reliable brownout and startup reset control.
For engineers reviewing the MAX6747KA30/V+ datasheet, MAX6747KA30/V+ pinout, MAX6747KA30/V+ application, or MAX6747KA30/V+ equivalent, this device delivers deterministic reset assertion during VCC drop below 3.0V, guaranteed RESET validity down to VCC = 1V, manual reset pulse handling (>1µs width), and automotive-grade operation from –40°C to +125°C - critical for engine control units, ADAS domain controllers, and battery management systems.
Technical Context
The MAX6747KA30/V+ implements a fixed-threshold VCC monitor with ±2% accuracy over –40°C to +125°C, using internal bandgap reference and comparator circuitry. Its MR pin features internal 12–28kΩ pullup and 100ns glitch rejection, enabling direct switch connection without external components.
Reset timeout is set via external capacitor on SRT pin (tRP = 4.94 × 10⁶ × CSRT), while watchdog functionality is disabled - confirmed by pin configuration (no WDS, SET0, SET1, or WDI used in MAX6747 variant) and Selector Guide. The push-pull RESET output drives low to ≤0.3V at 50µA sink and high to ≥0.8×VCC at 200µA source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 3.000V ±2% (factory-trimmed; ensures precise brownout detection at nominal 3.0V rail) |
| Supply Voltage Range | 1.2V to 5.5V (supports wide-input industrial and automotive supplies) |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V (enables ultra-low-power operation in battery-backed systems) |
| Reset Timeout Period | 5.69–9.49ms (adjustable via 100–1500pF capacitor on SRT pin) |
| Operating Temperature | –40°C to +125°C (AEC-Q100 Grade 0 qualification for under-hood automotive use) |
| RESET Output Type | Push-pull active-low (drives directly to µP reset pin without external pullup) |
| VCC to RESET Delay | 20µs (fast response to supply collapse; prevents false resets during fast transients) |
Pinout & Package
MAX6747KA30/V+ is housed in an 8-pin SOT23 package (Outline 21-0078, RoHS-compliant), with 0.65mm pitch, 2.9mm × 1.6mm footprint, and thermal resistance θJA = 196°C/W on four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Manual Reset Input) | Active-low input with internal 12–28kΩ pullup; asserts reset when held low >1µs; rejects <100ns glitches |
| 2 | WDS (Watchdog Select) | No-connect (watchdog disabled in MAX6747; unused per Selector Guide) |
| 3 | SWT (Watchdog Timeout) | No-connect (watchdog function absent; pin left floating or grounded per design guidance) |
| 4 | SRT (Reset Timeout) | Capacitor connection point; sets reset timeout period (tRP = 4.94 × 10⁶ × CSRT) |
| 5 | GND | Ground reference for all analog and digital circuitry; must be low-impedance return path |
| 6 | WDI (Watchdog Input) | No-connect (watchdog not implemented; pin must be tied to GND via 100kΩ per datasheet) |
| 7 | RESET | Push-pull active-low reset output; valid logic state guaranteed for VCC ≥ 1V; sinks ≤0.3V @ 50µA |
| 8 | VCC | Main supply input (1.2–5.5V); powers internal circuitry and serves as monitored voltage source |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 3.0V reset threshold | ±2% accuracy over full automotive temperature range eliminates external resistor divider and calibration effort |
| Integrated manual-reset input (MR) | Internal pullup (12–28kΩ) and 100ns glitch rejection enable direct switch interface without debouncing circuitry |
| Push-pull RESET output | Eliminates need for external pullup resistor, reducing BOM count and PCB space in space-constrained automotive modules |
| Capacitor-adjustable reset timeout | Supports µP-specific reset hold times (5.7–9.5ms typical) via single 100–1500pF ceramic capacitor on SRT pin |
| Power-supply transient immunity | Withstands 100mV VCC dips lasting ≤50µs without spurious reset - critical for noisy engine-bay environments |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Monitoring 3.3V or 5V microcontroller supply during cold cranking and load dump events. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset when VCC drops below 3.0V ±2%, holding reset for 7.6ms to ensure full µP initialization. Use Value: Prevents code execution errors during battery voltage sag (e.g., 6V cranking dip), validated across –40°C to +125°C operating range. |
Use Scenario: Ensuring safe boot sequence of vision processor SoC in camera module after ignition-on. IC Role / Device Role / Timing Role: Generating clean, glitch-immune reset pulse upon stable 1.8V/3.3V rail establishment, with MR support for firmware-triggered recovery. Use Value: Guarantees RESET validity down to VCC = 1V, eliminating risk of undefined µP state during partial power loss. |
| Automotive Body Control Module (BCM) | Battery Management System (BMS) Monitor IC |
Use Scenario: Reset coordination between LIN gateway MCU and peripheral drivers during wake-up from sleep mode. IC Role / Device Role / Timing Role: Providing synchronized reset signal with adjustable timeout (via SRT capacitor) matching MCU wake-up latency. Use Value: Enables precise timing alignment between power rail stabilization and firmware execution start, reducing system boot time jitter. |
Use Scenario: Supervising auxiliary 3.0V supply powering analog front-end and coulomb counter in 12V automotive BMS. IC Role / Device Role / Timing Role: Detecting brownout on isolated 3.0V rail and asserting reset to prevent corrupted cell voltage readings. Use Value: Factory-trimmed 3.0V threshold matches nominal rail voltage exactly, avoiding margin-based design overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6746KA30/V+ | Identical reset threshold (3.0V), same SOT23 package, but lacks MR input - uses RESET IN instead for adjustable monitoring | Requires external resistor divider for manual reset; unsuitable where direct switch interface is needed | Select MAX6747KA30/V+ when MR functionality is required; MAX6746KA30/V+ only if RESET IN monitoring is preferred |
| TLV803EB30DBZR | 3.0V ±1% threshold, 0.8µA supply current, no MR input, SOT23-3 package (3-pin), no capacitor-adjustable timeout | Limited to basic reset-only function; fixed 200ms timeout; incompatible pinout and feature set | Choose TLV803EB30DBZR only for cost-sensitive, non-automotive applications requiring minimal footprint and no manual reset |
Compared with MAX6746KA30/V+, the MAX6747KA30/V+ adds integrated MR for simplified system-level reset control, while TLV803EB30DBZR trades adjustability and automotive qualification for ultra-low quiescent current and smaller package - making MAX6747KA30/V+ the optimal choice for AEC-Q100-compliant designs needing manual intervention capability.
Availability
MAX6747KA30/V+ is available at Aetrix Electronics and suitable for automotive engine control, ADAS sensor fusion, and body electronics applications requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 compliance.
Supply support for MAX6747KA30/V+ 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The MAX6747KA30/V+ belongs to the MAX6746–MAX6753 family of automotive-grade μP supervisors, designed specifically for robust reset and watchdog functionality in harsh-temperature, safety-critical vehicle subsystems.
FAQ
What is the factory-trimmed reset threshold voltage of the MAX6747KA30/V+?
The MAX6747KA30/V+ has a factory-trimmed VCC reset threshold of 3.000V ±2% over –40°C to +125°C, as specified in Table 2 (suffix "30") and confirmed in the Electrical Characteristics table. This precise threshold enables direct monitoring of standard 3.0V or 3.3V rails without external calibration, and is validated per AEC-Q100 Grade 0 requirements.
Does the MAX6747KA30/V+ support manual reset functionality?
Yes, the MAX6747KA30/V+ includes a dedicated MR (Manual Reset) input on Pin 1. It features an internal 12–28kΩ pullup resistor and rejects transients shorter than 100ns. A low pulse >1µs on MR asserts RESET for the full timeout period, enabling direct switch or logic-level reset initiation without external components.
What type of RESET output does the MAX6747KA30/V+ provide?
The MAX6747KA30/V+ provides a push-pull active-low RESET output on Pin 7. It guarantees VOL ≤ 0.3V at 50µA sink and VOH ≥ 0.8×VCC at 200µA source, eliminating the need for an external pullup resistor. This differs from open-drain variants and simplifies interface to most microcontroller reset inputs.
Is the MAX6747KA30/V+ qualified for automotive applications?
Yes, the MAX6747KA30/V+ is AEC-Q100 qualified (Grade 0) and fully specified over –40°C to +125°C. Its electrical characteristics - including reset threshold accuracy, supply current, and transient immunity - are guaranteed across this extended temperature range, making it suitable for under-hood and safety-critical automotive systems.
How is the reset timeout period adjusted on the MAX6747KA30/V+?
The reset timeout period on the MAX6747KA30/V+ is adjusted using an external capacitor connected between Pin 4 (SRT) and GND. The relationship is tRP = 4.94 × 10⁶ × CSRT, yielding 5.69–9.49ms for 100–1500pF capacitors. Low-leakage ceramic capacitors are recommended to maintain timing accuracy across temperature and voltage.
MAX6747KA30/V+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 5.692ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6747KA30/V+ FAQ
1.How can I place an order for MAX6747KA30/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6747KA30/V+ 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 MAX6747KA30/V+ reliable?
The price and inventory of MAX6747KA30/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6747KA30/V+ is usually 5 days.
3.What payment methods are accepted for MAX6747KA30/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6747KA30/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6747KA30/V+?
MAX6747KA30/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6747KA30/V+ 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 MAX6747KA30/V+?
For technical support, including MAX6747KA30/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6747KA30/V+ requirements.
6.How does Aetrix verify that MAX6747KA30/V+ is sourced from the original manufacturer or authorized distributors?
All MAX6747KA30/V+ 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 MAX6747KA30/V+ meets industry standards.
7.What is the process for return or replacement of MAX6747KA30/V+?
All MAX6747KA30/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6747KA30/V+, 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 MAX6747KA30/V+ part is unused and in its original packaging.
Return procedure for MAX6747KA30/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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