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Analog Devices Inc./Maxim Integrated MAX6746KA31+T
- Part No.:
- MAX6746KA31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6746KA31+T.pdf
- Description:
- IC RESET MPU W/ADJ RESET SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:9,928
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Product details
Overview
MAX6746KA31+T from Analog Devices is a low-power microprocessor supervisory circuit with factory-trimmed 3.075V ±2% VCC reset threshold, capacitor-adjustable 5.7–9.5ms reset timeout, and normal-mode watchdog timeout (5.7–9.5ms at CSWT = 1500pF). It features push-pull active-low RESET output, manual-reset input (MR), and operates across -40°C to +125°C for automotive-grade μP monitoring in battery-powered controllers.
For engineers reviewing the MAX6746KA31+T datasheet, MAX6746KA31+T pinout, MAX6746KA31+T application, or MAX6746KA31+T equivalent, key selection criteria include its AEC-Q100 qualification, 3.7µA supply current at VCC ≤ 2.0V, immunity to VCC transients down to 100mV/50µs, and compatibility with single-supply systems requiring precise 3.075V brownout detection.
Technical Context
The MAX6746KA31+T implements dual-reset assertion logic: it triggers RESET when VCC falls below 3.075V ±2% or when MR is pulled low, with guaranteed RESET validity down to VCC ≥ 1V. Its reset timeout period (tRP) is set via external capacitor on SRT pin using tRP = 4.94 × 10⁶ × CSRT (seconds/Farads).
It includes a standard watchdog timer (not windowed) with timeout adjustable via SWT capacitor (tWD = 4.94 × 10⁶ × CSWT), selectable between normal and extended (128×) modes via WDS pin. No SET0/SET1 pins are present-confirming it belongs to the MAX6746–MAX6751 subgroup, not MAX6752/MAX6753.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.075V ±2% (factory-trimmed, AEC-Q100 qualified for automotive) |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V - enables ultra-low-power battery operation |
| Reset Timeout | 5.69–9.49ms (CSRT = 1500pF) - configurable from 0.5ms to >100ms via capacitor |
| Watchdog Timeout | 5.69–9.49ms (CSWT = 1500pF, normal mode) - extends to 729–1214ms in extended mode |
| Operating Temp | -40°C to +125°C - fully specified for under-hood automotive environments |
| RESET Output | Push-pull active-low - eliminates need for external pull-up; drives directly into μP reset pin |
| VCC Range | 1.2V to 5.5V - supports 1.8V, 2.5V, 3.3V, and 5V logic domains |
Pinout & Package
MAX6746KA31+T is housed in an 8-pin SOT23 package (package code K8+5A), with 0.65mm pitch, 2.9mm × 1.6mm footprint, and thermal resistance θJA = 196°C/W (4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Manual-Reset Input | Internally pulled up to VCC; asserts RESET when pulled low ≥1µs; rejects <100ns glitches |
| 2 - WDS | Watchdog Select | GND = normal mode (tWD); VCC = extended mode (128× tWD); clears watchdog on transition |
| 3 - SWT | Watchdog Timeout Input | Capacitor-to-GND sets tWD; connect to GND to disable watchdog |
| 4 - SRT | Reset Timeout Input | Capacitor-to-GND sets tRP per tRP = 4.94×10⁶ × CSRT (s/F) |
| 5 - GND | Ground Reference | Primary return path for all internal comparators and output stage |
| 6 - WDI | Watchdog Input | Falling edge resets watchdog timer; min pulse width 300ns; must not float (100kΩ to GND recommended) |
| 7 - RESET | Reset Output | Push-pull active-low; VOL ≤ 0.3V @ ISINK = 50µA; VOH ≥ 0.8×VCC when deasserted |
| 8 - VCC | Supply Voltage | Power input and monitored rail; RESET valid down to VCC = 1V; absolute max = +6.0V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Trimmed Reset Threshold | 3.075V ±2% over -40°C to +125°C - eliminates resistor-divider design and calibration |
| Capacitor-Adjustable Timing | Independent SRT/CSRT and SWT/CSWT tuning - decouples reset and watchdog timing for flexible firmware integration |
| Transient Immunity | Immune to 100mV/50µs VCC glitches - prevents spurious resets in noisy automotive power rails |
| Low-Power Operation | 3.7µA ICC at VCC ≤ 2.0V - extends battery life in portable medical and industrial controllers |
| AEC-Q100 Qualified | Grade 0 (-40°C to +125°C) qualification - meets automotive reliability and stress-test requirements |
Applications
| Automotive Engine Control Unit (ECU) | Portable Medical Infusion Pump |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply during cold-crank and load-dump events in engine bay. IC Role / Device Role / Timing Role: Supervisory circuit asserting hardware reset when VCC drops below 3.075V or MR is triggered by diagnostic interface. Use Value: Prevents ECU lockup during voltage sags; 3.7µA quiescent current minimizes parasitic drain on vehicle battery. | Use Scenario: Ensures safe restart of ARM-based controller after battery insertion or low-voltage brownout. IC Role / Device Role / Timing Role: Provides 7.6ms reset pulse and 7.6ms watchdog timeout (CSRT = CSWT = 1500pF) to match boot sequence timing. Use Value: Guarantees deterministic μP initialization; push-pull RESET eliminates external pull-up, saving PCB area in compact enclosure. |
| Industrial PLC I/O Module | Smart Energy Meter MCU |
Use Scenario: Guards against firmware corruption during 24V DC supply fluctuations in factory automation cabinets. IC Role / Device Role / Timing Role: Dual-trigger supervisor: monitors local 3.3V rail and accepts MR signal from front-panel reset button. Use Value: MR debounce built-in (1µs min pulse); 12kΩ–28kΩ internal pull-up removes need for external components. | Use Scenario: Maintains secure boot integrity in AMI meter during grid voltage dips and transient surges. IC Role / Device Role / Timing Role: Resets meter SoC when 3.3V supply falls below 3.075V; watchdog enforces periodic firmware health check. Use Value: ±2% threshold tolerance ensures consistent trip point across temperature; AEC-Q100 grade validates long-term field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6747KA31+T | Same 3.075V reset threshold, but open-drain RESET output and no MR pin - uses RESET IN instead | Suitable where level-shifting or wired-OR reset bus required; incompatible with direct MR switch interface | Select MAX6747KA31+T only if open-drain output and absence of MR are acceptable system constraints |
| TLV809E30DBZR | Fixed 3.0V reset threshold (±1.5%), no watchdog, no MR, SOT23-3 package - simpler, lower-cost alternative | Limited to basic power-on reset; cannot support watchdog supervision or manual reset functionality | Choose TLV809E30DBZR only for cost-sensitive, non-safety-critical applications lacking watchdog or MR requirements |
Compared with MAX6747KA31+T and TLV809E30DBZR, MAX6746KA31+T uniquely combines factory-trimmed 3.075V reset, integrated watchdog with mode select, manual-reset input, and push-pull output - making it the only option among the three capable of full-featured μP supervision in AEC-Q100-compliant designs.
Availability
MAX6746KA31+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 MAX6746KA31+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
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 robust, low-power microprocessor supervision in harsh environments - emphasizing precision reset thresholds, transient immunity, and flexible timing configuration for automotive and industrial control systems.
FAQ
What is the exact reset threshold voltage of MAX6746KA31+T and how is it trimmed?
The MAX6746KA31+T has a factory-trimmed VCC reset threshold of 3.075V with ±2% tolerance over -40°C to +125°C. This value is fixed by laser trimming during wafer test and corresponds to suffix "31" in the ordering code per Table 2. No external resistors are needed - the threshold is internally set and guaranteed without user adjustment.
Does MAX6746KA31+T support watchdog functionality, and how is it configured?
Yes, MAX6746KA31+T includes a standard (non-windowed) watchdog timer. It is configured using capacitor CSWT on the SWT pin (tWD = 4.94 × 10⁶ × CSWT), with mode selected via WDS: grounded for normal timeout (e.g., 7.6ms at 1500pF), or tied to VCC for 128× extended timeout (e.g., 975ms). WDI must receive falling edges within tWD to prevent reset assertion.
What is the function of the MR pin on MAX6746KA31+T, and what are its electrical requirements?
The MR pin on MAX6746KA31+T is a manual-reset input with internal 12–28kΩ pull-up to VCC. Pulling MR low for ≥1µs asserts RESET; it rejects transients <100ns. MR may be left unconnected if unused. No external pull-up or debouncing circuitry is required - simplifying front-panel reset implementation in industrial and medical equipment.
Can MAX6746KA31+T operate reliably at VCC = 1.8V, and what is its supply current at that voltage?
Yes, MAX6746KA31+T is fully specified down to VCC = 1.2V and operates reliably at 1.8V. At VCC ≤ 3.3V, its typical supply current is 4.2–9µA; at VCC = 1.8V, ICC is approximately 4.5µA (within the 4.2–9µA range). RESET remains valid and functional, with VOL ≤ 0.3V at ISINK = 50µA, ensuring compatibility with 1.8V logic interfaces.
Is MAX6746KA31+T qualified for automotive applications, and what is its temperature rating?
Yes, MAX6746KA31+T is AEC-Q100 qualified (Grade 0) and fully specified over -40°C to +125°C ambient temperature. Its electrical characteristics - including reset threshold accuracy, timing consistency, and supply current - are guaranteed across this full automotive temperature range, making it suitable for under-hood and infotainment applications.
MAX6746KA31+T 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:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.075V
- Output:
- Push-Pull, Totem Pole
- 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
MAX6746KA31+T FAQ
1.How can I place an order for MAX6746KA31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6746KA31+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 MAX6746KA31+T reliable?
The price and inventory of MAX6746KA31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6746KA31+T is usually 5 days.
3.What payment methods are accepted for MAX6746KA31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6746KA31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6746KA31+T?
MAX6746KA31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6746KA31+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 MAX6746KA31+T?
For technical support, including MAX6746KA31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6746KA31+T requirements.
6.How does Aetrix verify that MAX6746KA31+T is sourced from the original manufacturer or authorized distributors?
All MAX6746KA31+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 MAX6746KA31+T meets industry standards.
7.What is the process for return or replacement of MAX6746KA31+T?
All MAX6746KA31+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6746KA31+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 MAX6746KA31+T part is unused and in its original packaging.
Return procedure for MAX6746KA31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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