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Analog Devices Inc./Maxim Integrated MAX6751KA46-T
- Part No.:
- MAX6751KA46-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6751KA46-T.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:21,864
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Product details
Overview
MAX6751KA46-T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-trimmed 4.625V ±2% VCC reset threshold, capacitor-adjustable reset timeout (5.7–9.5ms), and watchdog timeout (5.7–9.5ms normal / 729–1214ms extended), designed for automotive-grade voltage monitoring in battery-powered controllers and embedded systems.
For engineers reviewing the MAX6751KA46-T datasheet, MAX6751KA46-T pinout, MAX6751KA46-T application, or MAX6751KA46-T equivalent, this device delivers AEC-Q100 qualified single-supply supervision with manual reset input, push-pull or open-drain RESET output, and transient-immune operation down to VCC ≥ 1V - critical for reliable brownout recovery in automotive ECUs and portable medical instruments.
Technical Context
The MAX6751KA46-T implements dual-voltage supervision: factory-trimmed VCC monitoring at 4.625V and adjustable external voltage monitoring via RESET IN with 1.235V threshold. Its reset assertion is triggered by VCC drop below 4.625V, RESET IN falling below 1.235V, or MR pull-low, with guaranteed reset validity for VCC ≥ 1V.
It features a selectable watchdog timer with normal/extended modes (128× timeout scaling via WDS), capacitor-programmable timing (SRT for reset timeout, SWT for watchdog timeout), and internal ramp-based comparator architecture enabling precise, temperature-stable thresholds across –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.625V ±2% (factory-trimmed); ensures accurate power-fail detection for 5V rail systems without external resistors |
| Supply Current | 3.7–10µA (VCC = 1.2–5.5V); enables multi-year battery life in portable medical and automotive sensors |
| Reset Timeout Period | 5.7–9.5ms (CSRT = 1500pF); programmable via external capacitor to match µP reset hold-time requirements |
| Watchdog Timeout | 5.7–9.5ms (normal) or 729–1214ms (extended mode); configurable via SWT capacitor and WDS logic level |
| Operating Temperature | –40°C to +125°C; fully specified for under-hood automotive and industrial control applications |
| RESET Output Type | Push-pull or open-drain active-low; supports direct µP reset input or level-shifted interfacing up to 6V |
| Manual Reset Input | MR pin with 12–28kΩ internal pullup; accepts momentary switch without external components |
Pinout & Package
MAX6751KA46-T is housed in an 8-pin SOT23 package (package code K8+5, outline 21-0078), optimized for space-constrained automotive and portable designs. Thermal resistance is 196°C/W (Junction-to-Ambient, four-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET IN | High-impedance input for external voltage monitoring; sets threshold via resistor divider (1.235V reference) |
| 2 | WDS | Watchdog Select Input: GND = normal mode, VCC = 128× extended timeout; clears watchdog on state change |
| 3 | SWT | Watchdog Timeout Input: capacitor to GND sets base timeout period (tWD = 4.94×10⁶ × CSWT) |
| 4 | SRT | Reset Timeout Input: capacitor to GND sets reset pulse width (tRP = 4.94×10⁶ × CSRT) |
| 5 | GND | Ground reference for all analog and digital functions; must be low-impedance connection |
| 6 | WDI | Watchdog Input: falling edge resets watchdog timer; ignored during RESET assertion |
| 7 | RESET | Active-low reset output: push-pull or open-drain; asserts for full tRP after fault clearance |
| 8 | VCC | Supply input (1.0–5.5V); powers internal circuitry and serves as monitored voltage source |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.625V reset threshold | Eliminates external resistor network for 5V system supervision, reducing BOM count and layout area |
| Capacitor-adjustable reset & watchdog timeouts | Enables precise timing alignment with µP boot sequence and firmware watchdog service intervals |
| 128× watchdog timeout extension | Supports long-latency firmware operations (e.g., flash programming) without compromising safety coverage |
| Power-supply transient immunity | Rejects ≤50µs transients down to 100mV below threshold - critical for noisy automotive 12V supply rails |
| AEC-Q100 qualification | Validated for automotive applications including engine control, ADAS sensors, and body electronics |
Applications
| Automotive Engine Control Unit (ECU) | Portable Medical Infusion Pump |
|---|---|
|
Use Scenario: Monitors 5V microcontroller supply during cold cranking when battery dips to 6–9V. IC Role / Device Role / Timing Role: Supervises VCC and RESET IN (for auxiliary 3.3V rail), asserts RESET if either drops below threshold, holds reset for 7.6ms minimum. Use Value: Prevents erratic ECU behavior during voltage sag; 125°C rating ensures reliability near engine bay heat sources. |
Use Scenario: Ensures safe restart after battery insertion or low-battery warning in handheld infusion devices. IC Role / Device Role / Timing Role: Dual-monitoring of main Li-ion supply (via VCC) and MCU core voltage (via RESET IN), with manual reset via tactile switch. Use Value: 3.7µA quiescent current extends battery life; push-pull RESET guarantees valid logic down to VCC = 1V. |
| Industrial PLC I/O Module | Smart Energy Meter |
|
Use Scenario: Guards against brownout-induced firmware corruption during AC line fluctuations in factory automation. IC Role / Device Role / Timing Role: Uses WDS-controlled extended watchdog to supervise long-cycle sensor polling routines while maintaining safety coverage. Use Value: Capacitor-programmable timeouts eliminate need for firmware rework when timing requirements change. |
Use Scenario: Provides fail-safe reset during power interruptions in utility-grade metering with tamper detection. IC Role / Device Role / Timing Role: Monitors both 5V system rail and isolated 3.3V communication interface; RESET IN tied to isolated DC-DC feedback node. Use Value: AEC-Q100 qualification ensures long-term reliability in field-deployed meters exposed to wide temperature swings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6750KA46-T | Dual-voltage monitor with same 4.625V VCC threshold but adds adjustable RESET IN monitoring; no WDS pin (fixed watchdog only) | Lacks 128× watchdog extension; suitable for simpler systems where extended timeout is unnecessary | Select MAX6750KA46-T when dual-rail monitoring is required but extended watchdog functionality is not needed. |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, 200ms fixed watchdog, no capacitor adjustment; 1.5µA typical ICC | Not suitable for 5V systems or applications requiring customizable timeout periods | Choose TPS3808G33DBVR only for cost-sensitive 3.3V-only applications with static timing needs. |
Compared with MAX6751KA46-T, MAX6750KA46-T provides identical reset accuracy but sacrifices watchdog flexibility, while TPS3808G33DBVR offers lower current but lacks programmability and 5V compatibility - making MAX6751KA46-T optimal for automotive and dual-rail industrial designs requiring timing adaptability.
Availability
MAX6751KA46-T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical devices, industrial PLC modules, and smart energy meters requiring stable component supply with AEC-Q100 assurance and long-term lifecycle support.
Supply support for MAX6751KA46-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 demanding industrial, automotive, and medical applications, emphasizing high reliability and extended temperature performance.
The MAX6746–MAX6753 product line delivers capacitor-programmable microprocessor supervisors targeting automotive-grade voltage monitoring, brownout protection, and watchdog safety in harsh environments.
FAQ
What is the exact factory-trimmed reset threshold voltage for MAX6751KA46-T?
The MAX6751KA46-T has a factory-trimmed VCC reset threshold of 4.625V with ±2% tolerance over –40°C to +125°C, as confirmed in Table 2 (suffix "46") and Electrical Characteristics. This value is laser-trimmed at wafer test and does not require external resistor calibration.
Does MAX6751KA46-T support dual-voltage monitoring?
Yes, MAX6751KA46-T supports dual-voltage monitoring: it monitors VCC at its factory-set 4.625V threshold and simultaneously monitors an external voltage via the RESET IN pin using a 1.235V internal reference. This enables supervision of both primary and auxiliary rails in a single device.
How is the watchdog timeout extended by 128× in MAX6751KA46-T?
In MAX6751KA46-T, connecting the WDS pin to VCC selects extended watchdog mode, multiplying the base timeout (set by CSWT) by 128×. For example, a 1500pF SWT capacitor yields ~7.6ms normal timeout and ~971ms extended timeout - verified in the Electrical Characteristics table under "Extended Watchdog Timeout".
What is the minimum VCC required for MAX6751KA46-T to guarantee valid RESET output?
MAX6751KA46-T guarantees correct RESET logic state for VCC ≥ 1V, per Absolute Maximum Ratings and Electrical Characteristics. Below 1V, RESET may become indeterminate unless a pulldown resistor is added (for push-pull variants) - a design consideration explicitly documented in the datasheet's "Ensuring a Valid RESET Down to VCC = 0V" section.
Is MAX6751KA46-T qualified for automotive applications?
Yes, MAX6751KA46-T is AEC-Q100 qualified and fully specified over the automotive temperature range (–40°C to +125°C). Its thermal resistance (196°C/W), transient immunity, and production testing across temperature ensure suitability for under-hood and body-control module deployments.
MAX6751KA46-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.625V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6751KA46-T FAQ
1.How can I place an order for MAX6751KA46-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6751KA46-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 MAX6751KA46-T reliable?
The price and inventory of MAX6751KA46-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6751KA46-T is usually 5 days.
3.What payment methods are accepted for MAX6751KA46-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6751KA46-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6751KA46-T?
MAX6751KA46-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6751KA46-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 MAX6751KA46-T?
For technical support, including MAX6751KA46-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6751KA46-T requirements.
6.How does Aetrix verify that MAX6751KA46-T is sourced from the original manufacturer or authorized distributors?
All MAX6751KA46-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 MAX6751KA46-T meets industry standards.
7.What is the process for return or replacement of MAX6751KA46-T?
All MAX6751KA46-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6751KA46-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 MAX6751KA46-T part is unused and in its original packaging.
Return procedure for MAX6751KA46-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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