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Analog Devices Inc./Maxim Integrated MAX6751KA30+
- Part No.:
- MAX6751KA30+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6751KA30+.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
- Shipping:
Inventory:2,884
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Product details
Overview
MAX6751KA30+ from Analog Devices is a low-power microprocessor supervisory IC that monitors dual supply voltages (VCC and external RESET IN), provides capacitor-adjustable reset timeout (5.7–9.5 ms) and watchdog timeout (5.7–9.5 ms normal / 729–1214 ms extended), and features ±2% factory-trimmed 3.0V VCC reset threshold with hysteresis. It serves as a system-level safety monitor in automotive engine control units requiring AEC-Q100 compliance, brownout immunity, and manual-reset capability.
For engineers reviewing the MAX6751KA30+ datasheet, MAX6751KA30+ pinout, MAX6751KA30+ application, or MAX6751KA30+ equivalent, this device delivers dual-voltage supervision (VCC + adjustable RESET IN), selectable watchdog modes via WDS, push-pull active-low RESET output, and guaranteed operation down to VCC = 1.0V - critical for battery-backed industrial controllers and automotive infotainment power sequencing.
Technical Context
The MAX6751KA30+ implements dual-supply monitoring: a factory-trimmed 3.0V threshold for VCC (±2% over −40°C to +125°C) and an adjustable 1.235V internal reference for external voltage monitoring via RESET IN pin. Its reset timeout (tRP) and watchdog timeout (tWD) are independently set using external capacitors CSRT and CSWT, with tRP = 4.94×10⁶ × CSRT and tWD = 4.94×10⁶ × CSWT (normal mode).
Watchdog behavior is controlled by the WDS pin: grounded for standard timeout, pulled to VCC to extend timeout by 128×. The device asserts RESET when VCC or RESET IN falls below its respective threshold, or when MR is pulled low, and holds RESET active for the full tRP after all conditions clear - with immunity to transients ≤50 µs at 100 mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VCC) | 3.000 V ±2% - factory-trimmed for precise brownout detection at nominal 3.0V rail |
| RESET IN Threshold | 1.235 V ±1.5% - enables external voltage monitoring via resistor divider |
| Supply Current | 3.7 µA typical at VCC ≤ 2.0V - ultra-low quiescent current for battery-critical systems |
| Reset Timeout Range | 0.51–9.49 ms - set by 100 pF to 1500 pF capacitor on SRT pin |
| Watchdog Timeout (Normal) | 0.51–9.49 ms - identical capacitor scaling as reset timeout, for software watchdog servicing |
| Watchdog Timeout (Extended) | 64.8–1214 ms - 128× multiplication enabled by WDS = VCC, supporting long-loop firmware |
| Operating Temperature | −40°C to +125°C - fully specified for under-hood automotive and industrial environments |
Pinout & Package
MAX6751KA30+ is housed in an 8-pin SOT23 package (package code K8+5A), with 0.65 mm pitch, 2.9 mm × 1.6 mm footprint, and JEDEC MO-178 compliant outline. Thermal resistance (qJA) is 196°C/W on a four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | Adjustable voltage monitor input | High-impedance node referenced to 1.235V internal comparator; connects to center of external R-divider to set custom reset threshold for secondary supply |
| 2 - GND | Ground reference | Primary return path for all internal circuitry and capacitor timing networks (SRT, SWT) |
| 3 - VCC | Power supply input | Monitored 1.2–5.5V supply rail; powers internal logic and enables VCC reset function with 3.0V threshold |
| 4 - RESET | Active-low reset output | Push-pull driver asserted low during fault; guarantees valid logic state for VCC ≥ 1.0V; sinks up to 3.2 mA at 4.5V |
| 5 - SWT | Watchdog timeout capacitor terminal | Connects to ground via CSWT to set tWD; open or grounded to disable watchdog |
| 6 - SRT | Reset timeout capacitor terminal | Connects to ground via CSRT to set tRP; timing accuracy maintained across full temperature range |
| 7 - WDS | Watchdog mode select | Pull to GND for normal watchdog; pull to VCC to enable 128× extended timeout; state change clears watchdog timer |
| 8 - MR | Manual reset input | Internally pulled up to VCC; falling edge >1 µs asserts RESET; rejects <100 ns glitches |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply supervision | Simultaneously monitors VCC (3.0V fixed) and external voltage (via RESET IN), enabling robust power sequencing for multi-rail SoCs |
| Capacitor-adjustable timing | Independent, linear scaling of reset and watchdog timeouts using low-leakage ceramic capacitors - no trimming resistors or firmware overhead |
| 128× watchdog extension | WDS pin toggles between standard and extended modes, eliminating need for large timing capacitors in long-interval applications |
| AEC-Q100 qualified | Qualified to Grade 0 (−40°C to +125°C), supporting automotive ECU, ADAS, and body control module deployment without derating |
| Transient-immune reset assertion | Guaranteed no false reset for VCC transients ≤50 µs at 100 mV overdrive - critical for noisy 12V automotive systems |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply and 5V sensor interface rail during cold cranking and load dump events. IC Role / Device Role / Timing Role: Dual-voltage supervisor asserting RESET if either rail drops below threshold; uses MR for service-mode reinitialization. Use Value: Prevents corrupted firmware execution during transient brownouts; 125°C rating ensures reliability in under-hood placement. |
Use Scenario: Ensures deterministic restart of ARM-based controller after power interruption in factory automation cabinet. IC Role / Device Role / Timing Role: Provides capacitor-programmable reset timeout (7.6 ms) and extended watchdog (729 ms) to match boot sequence and cyclic task timing. Use Value: Eliminates need for external RC networks or microcontroller-based reset logic, reducing BOM count and layout area. |
| Battery-Powered Medical Monitor | Smart Energy Meter |
Use Scenario: Supervises Li-ion battery-backed 1.8V MCU and 3.0V display driver in portable ECG device. IC Role / Device Role / Timing Role: Uses RESET IN to monitor backup rail while VCC tracks main supply; leverages 3.7 µA ICC to maximize battery life. Use Value: Enables >1-year shelf life with coin-cell backup; push-pull RESET ensures clean reset pulse without external pullup. |
Use Scenario: Guards against firmware lockup in metrology SoC during voltage sags caused by grid switching transients. IC Role / Device Role / Timing Role: Implements windowed watchdog behavior via WDS-controlled extension, detecting both stuck and runaway firmware states. Use Value: Meets IEC 62056-21 metering certification requirements for fault recovery within 100 ms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6750KA30+ | Same 3.0V VCC threshold and dual-monitor architecture, but lacks MR pin - RESET IN only used for external voltage | No manual reset capability; requires external switch circuitry for field service reset | Select when MR functionality is unnecessary and board space must be minimized |
| TLV809E30DBZR | Single-supply (3.0V only), no adjustable RESET IN, no watchdog, no WDS/MR - basic reset IC with 200 ms fixed timeout | Limited to simple power-on reset; cannot support software watchdog or dual-rail monitoring | Select only for cost-sensitive, non-safety-critical applications where extended features are unused |
Compared with MAX6750KA30+, the MAX6751KA30+ adds MR for field-service reset without external components; compared with TLV809E30DBZR, it delivers programmable timing, dual-supply monitoring, and watchdog - making it suitable for functional-safety-aware designs where deterministic fault recovery is required.
Availability
MAX6751KA30+ is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, battery-powered medical devices, and smart energy meters requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX6751KA30+ 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 MAX6746–MAX6753 family was designed specifically for AEC-Q100-compliant microprocessor supervision in harsh environments, emphasizing ultra-low power, dual-rail monitoring, and configurable watchdog timing for automotive and industrial control systems.
FAQ
What is the exact reset threshold voltage for MAX6751KA30+?
The MAX6751KA30+ features a factory-trimmed VCC reset threshold of 3.000 V with ±2% tolerance over −40°C to +125°C. This value is confirmed in the Electrical Characteristics table under "VCC Reset Threshold" and corresponds to suffix "30" in the ordering code. The RESET IN pin uses a separate 1.235 V reference for external voltage monitoring.
Does MAX6751KA30+ support dual-voltage monitoring?
Yes, MAX6751KA30+ supports dual-voltage monitoring: it monitors VCC with a fixed 3.0V threshold and simultaneously monitors an external voltage via the RESET IN pin using a 1.235V internal reference. This allows independent supervision of two rails - for example, a 3.3V MCU core and a 5V peripheral interface - with RESET asserted if either falls below its threshold.
How is the watchdog timeout extended on MAX6751KA30+?
The watchdog timeout on MAX6751KA30+ is extended by 128× when the WDS pin is pulled high to VCC. In normal mode (WDS = GND), tWD = 4.94×10⁶ × CSWT; in extended mode (WDS = VCC), tWD = 128 × (4.94×10⁶ × CSWT). A state change on WDS clears the watchdog timer, ensuring deterministic restart on mode transition.
What package type and RoHS status does MAX6751KA30+ use?
MAX6751KA30+ is supplied in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176) with RoHS-compliant finish indicated by the "+" suffix in the package code K8+5A. The device meets lead-free soldering requirements with a maximum reflow temperature of +260°C and is compatible with standard SMT assembly processes.
Can MAX6751KA30+ operate with VCC below 1.8V?
Yes, MAX6751KA30+ operates with VCC as low as 1.2V (minimum specified at −40°C to 0°C) and 1.0V (guaranteed RESET validity). Supply current drops to 3.7 µA typical at VCC ≤ 2.0V, and RESET remains functional - asserted low with VOL ≤ 0.3V at ISINK = 50 µA - enabling use in ultra-low-voltage battery systems such as coin-cell–backed instrumentation.
MAX6751KA30+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6751KA30+ FAQ
1.How can I place an order for MAX6751KA30+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6751KA30+ 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 MAX6751KA30+ reliable?
The price and inventory of MAX6751KA30+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6751KA30+ is usually 5 days.
3.What payment methods are accepted for MAX6751KA30+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6751KA30+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6751KA30+?
MAX6751KA30+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6751KA30+ 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 MAX6751KA30+?
For technical support, including MAX6751KA30+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6751KA30+ requirements.
6.How does Aetrix verify that MAX6751KA30+ is sourced from the original manufacturer or authorized distributors?
All MAX6751KA30+ 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 MAX6751KA30+ meets industry standards.
7.What is the process for return or replacement of MAX6751KA30+?
All MAX6751KA30+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6751KA30+, 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 MAX6751KA30+ part is unused and in its original packaging.
Return procedure for MAX6751KA30+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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