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Analog Devices Inc./Maxim Integrated MAX6747KA31+T
- Part No.:
- MAX6747KA31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6747KA31+T.pdf
- Description:
- IC RESET MPU W/ADJ RESET SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,260
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Product details
Overview
The MAX6747KA31+T from Analog Devices is a low-power microprocessor supervisory circuit with factory-trimmed 3.075V VCC reset threshold, manual-reset input (MR), open-drain active-low RESET output, and capacitor-adjustable reset timeout (tRP) and watchdog timeout (tWD). It monitors single-supply VCC (1.2V–5.5V), asserts reset on brownout or MR activation, and provides transient-immune reset logic for automotive-grade embedded controllers.
For engineers reviewing the MAX6747KA31+T datasheet, MAX6747KA31+T pinout, MAX6747KA31+T application, or MAX6747KA31+T equivalent, key selection criteria include its AEC-Q100 qualification, ±2% reset threshold accuracy over –40°C to +125°C, 3.7µA supply current at 2.0V, 8-pin SOT23 package, and support for manual reset with internal 20kΩ pullup.
Technical Context
The MAX6747KA31+T implements dual independent reset triggers: one from VCC falling below 3.075V ±2%, and another from MR pulled low. Reset remains asserted for a capacitor-programmable timeout (tRP = 4.94×10⁶ × CSRT), with guaranteed RESET validity down to VCC ≥ 1V.
It features a standard watchdog timer (not windowed) with capacitor-adjustable timeout (tWD = 4.94×10⁶ × CSWT) and WDS pin-selectable 128× extended mode. Watchdog clears on WDI falling edge (≥300ns pulse width) or RESET assertion, and restarts after RESET deassertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.075V ±2% (factory-trimmed); ensures reliable brownout detection across automotive temperature range |
| Supply Voltage Range | 1.2V to 5.5V; supports wide-input battery-powered and automotive systems |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V; enables ultra-low-power operation in always-on monitoring |
| Reset Timeout | Capacitor-adjustable (CSRT); tRP = 4.94×10⁶ × CSRT seconds; allows precise match to µP power-up timing |
| Watchdog Timeout | Capacitor-adjustable (CSWT); tWD = 4.94×10⁶ × CSWT seconds; supports software execution cycle alignment |
| Operating Temp | –40°C to +125°C; fully specified for under-hood automotive applications per AEC-Q100 |
| RESET Output | Open-drain active-low; compatible with 0–6V pullup voltages and mixed-voltage system interfacing |
Pinout & Package
Package: 8-pin SOT23 (package code K8+5A), footprint-compatible with JEDEC MO-178AB, thermal resistance θJA = 196°C/W on four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Manual-Reset Input | Internally pulled up to VCC (~20kΩ); asserts reset when pulled low ≥1µs; rejects <100ns glitches |
| 2 - WDS | Watchdog Select Input | GND = normal mode (tWD); VCC = extended mode (128×tWD); state change clears watchdog timer |
| 3 - SWT | Watchdog Timeout Input | Capacitor-to-GND sets tWD; connect to GND to disable watchdog function |
| 4 - SRT | Reset Timeout Input | Capacitor-to-GND sets tRP; determines duration of RESET assertion after fault clearance |
| 5 - GND | Ground Reference | Primary return path for all internal circuits and external capacitors |
| 6 - WDI | Watchdog Input | Falling-edge triggered; must toggle within tWD to prevent reset; requires 100kΩ pull-down if unused |
| 7 - RESET | Reset Output | Open-drain active-low; sinks ≥50µA at VOL ≤ 0.3V; valid for VCC ≥ 1V |
| 8 - VCC | Supply Voltage Input | Power source and monitored rail; supports 1.2–5.5V; absolute max 6.0V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Trimmed Reset Threshold | 3.075V ±2% over –40°C to +125°C eliminates external resistor divider and calibration effort |
| Manual-Reset Input with Internal Pullup | 20kΩ internal MR pullup enables direct switch connection without external components |
| Transient-Immune Reset Logic | Rejects 50µs transients ≤100mV below VTH, reducing false resets in noisy automotive environments |
| Capacitor-Adjustable Timing | Independent CSRT and CSWT capacitors allow precise, layout-tunable reset and watchdog timeouts |
| AEC-Q100 Qualified | Qualified to Grade 0 (–40°C to +150°C junction) per AEC-Q100 Rev H, supporting automotive safety-critical use |
Applications
| Automotive Body Control Module | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply in door module exposed to load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset and manual reset via service switch; tRP set to 200ms to exceed µP POR requirement. Use Value: Prevents erratic MCU behavior during battery voltage sag; MR enables field technician-initiated recovery without power cycle. | Use Scenario: Ensures safe restart of ARM-based pump controller after power interruption or firmware hang. IC Role / Device Role / Timing Role: Dual-trigger supervisor: VCC monitor (3.075V) + MR input; watchdog timeout set to 1.5s to align with motor control loop. Use Value: Guarantees deterministic reset state before re-engaging peristaltic drive; open-drain RESET interfaces cleanly with 5V logic-level safety circuitry. |
| Industrial PLC I/O Module | Battery-Powered Data Logger |
Use Scenario: Protects Cortex-M4 core in DIN-rail mounted I/O processor subjected to EFT bursts and supply ripple. IC Role / Device Role / Timing Role: Primary reset generator with transient immunity; CSRT = 1nF yields 4.94ms tRP matching FPGA configuration time. Use Value: Eliminates need for RC network and Schmitt trigger; ±2% VTH tolerance ensures consistent trip point across temperature and unit variance. | Use Scenario: Maintains reliable wake-up/reset for MSP430-based logger operating from Li-SOCl₂ battery (2.0–3.6V). IC Role / Device Role / Timing Role: Low-quiescent supervisor: 3.7µA ICC at 2.0V extends battery life; MR enables user-initiated data flush before shutdown. Use Value: Enables >10-year shelf life in storage mode; open-drain RESET allows shared reset bus with other low-voltage peripherals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6746KA31+T | Push-pull RESET output (vs. open-drain); identical VTH, tRP/tWD adjustability, and MR functionality | Requires no external pullup; unsuitable where level-shifting or wired-OR reset bus needed | Select MAX6746KA31+T when driving single µP with dedicated reset line and no voltage translation required |
| TPS3808G33DBVR | Fixed 3.3V reset threshold (±0.5%), 1.5µA ICC, no MR input, push-pull RESET, same SOT23-8 package | Lacks manual reset and adjustable timeouts; tighter VTH tolerance but no capacitor tuning | Choose TPS3808G33DBVR for cost-sensitive, fixed-threshold applications where MR and timeout flexibility are unnecessary |
Compared with MAX6747KA31+T, MAX6746KA31+T offers push-pull output for simpler single-load designs, while TPS3808G33DBVR trades adjustability and MR for lower current and tighter threshold accuracy-making each optimal for distinct system architecture priorities.
Availability
MAX6747KA31+T is available at Aetrix Electronics and suitable for automotive body control modules, medical infusion pump controllers, industrial PLC I/O modules, and battery-powered data loggers requiring stable component supply across extended temperature ranges.
Supply support for MAX6747KA31+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 precision, industrial, automotive, and communications markets.
The MAX6746–MAX6753 family delivers AEC-Q100-qualified, low-power µP supervisors with configurable reset/watchdog timing for automotive and safety-critical embedded systems demanding robust power-monitoring integrity.
FAQ
What is the factory-trimmed reset threshold voltage of the MAX6747KA31+T?
The MAX6747KA31+T has a factory-trimmed VCC reset threshold of 3.075V with ±2% tolerance over –40°C to +125°C, as confirmed by the "31" suffix in the ordering code and Table 2 of the datasheet. This value is laser-trimmed during production and does not require external resistor networks. The MAX6747KA31+T uses this fixed threshold exclusively for VCC monitoring and does not support adjustable RESET IN input.
Does the MAX6747KA31+T support manual reset, and how is it implemented?
Yes, the MAX6747KA31+T includes a dedicated manual-reset input (MR) on Pin 1. MR is internally pulled up to VCC with ~20kΩ resistance, allowing direct connection to a momentary switch without external components. A low pulse ≥1µs on MR asserts RESET for the full capacitor-programmed timeout period. The MAX6747KA31+T also rejects transients <100ns, ensuring noise immunity in electrically harsh environments.
What type of RESET output does the MAX6747KA31+T provide, and what are its drive capabilities?
The MAX6747KA31+T provides an open-drain active-low RESET output on Pin 7. It guarantees VOL ≤ 0.3V at ISINK = 50µA for VCC ≥ 1.0V, supporting interface with 0–6V logic systems via external pullup. Unlike push-pull variants (e.g., MAX6746KA31+T), this configuration enables wired-OR reset buses and level shifting-critical in multi-rail embedded systems where the MAX6747KA31+T is commonly deployed.
How is the watchdog timeout configured on the MAX6747KA31+T?
The MAX6747KA31+T implements a standard (non-windowed) watchdog timer with timeout set by capacitor CSWT on Pin 3 (SWT). The formula is tWD = 4.94×10⁶ × CSWT seconds. A WDS pin (Pin 2) selects between normal mode (WDS = GND) and extended mode (WDS = VCC, 128× multiplier). The MAX6747KA31+T does not support SET0/SET1 pin strapping or windowed watchdog functionality-those are exclusive to MAX6752/MAX6753 variants.
Is the MAX6747KA31+T qualified for automotive applications, and what is its temperature rating?
Yes, the MAX6747KA31+T is AEC-Q100 qualified (Grade 0) and fully specified from –40°C to +125°C ambient temperature. Its electrical characteristics-including reset threshold accuracy, supply current, and timing parameters-are guaranteed across this range. The device uses the 8-pin SOT23 package (K8+5A) with thermal resistance θJA = 196°C/W on a four-layer board, making it suitable for under-hood and chassis-mounted automotive ECUs where the MAX6747KA31+T provides mission-critical supervision.
MAX6747KA31+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:
- 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
MAX6747KA31+T FAQ
1.How can I place an order for MAX6747KA31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6747KA31+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 MAX6747KA31+T reliable?
The price and inventory of MAX6747KA31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6747KA31+T is usually 5 days.
3.What payment methods are accepted for MAX6747KA31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6747KA31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6747KA31+T?
MAX6747KA31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6747KA31+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 MAX6747KA31+T?
For technical support, including MAX6747KA31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6747KA31+T requirements.
6.How does Aetrix verify that MAX6747KA31+T is sourced from the original manufacturer or authorized distributors?
All MAX6747KA31+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 MAX6747KA31+T meets industry standards.
7.What is the process for return or replacement of MAX6747KA31+T?
All MAX6747KA31+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6747KA31+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 MAX6747KA31+T part is unused and in its original packaging.
Return procedure for MAX6747KA31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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