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Analog Devices Inc./Maxim Integrated MAX6747KA29+T
- Part No.:
- MAX6747KA29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6747KA29+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,002
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Product details
Overview
The MAX6747KA29+T from Analog Devices is a low-power microprocessor supervisory circuit with factory-trimmed 2.925V ±2% VCC reset threshold, manual-reset input (MR), push-pull 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 operation for automotive engine control units requiring guaranteed reset validity down to VCC ≥ 1V.
For engineers reviewing the MAX6747KA29+T datasheet, MAX6747KA29+T pinout, MAX6747KA29+T application, or MAX6747KA29+T equivalent, this device delivers AEC-Q100 qualified supervision with configurable watchdog extension (128×), 3.7µA supply current at 2V, and automotive-grade temperature support (−40°C to +125°C) - critical for battery-powered controllers and medical equipment where deterministic reset timing and manual recovery are mandatory.
Technical Context
The MAX6747KA29+T implements a dual-comparator architecture: one for fixed 2.925V VCC monitoring and another for manual-reset detection via internal MR pullup (12–28kΩ). Its reset assertion logic guarantees valid output state for VCC ≥ 1V and includes 20µs VCC-to-RESET delay with immunity to transients ≤50µs at 100mV overdrive.
Watchdog functionality uses an external capacitor on SWT to set tWD (5.7–9.5ms typical at CSWT = 1500pF), extendable to 729–1214ms via WDS pin strapping. The MR input rejects 100ns glitches and requires ≥1µs low pulse to trigger reset, with reset remaining asserted for the full tRP after MR release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.925V ±2% (factory-trimmed); ensures precise brownout detection at nominal 2.9V rail without external resistors |
| Supply Current | 3.7µA at VCC ≤ 2.0V; enables multi-year battery life in portable medical sensors and remote telematics |
| Reset Timeout | Adjustable 0.5–9.5ms via CSRT capacitor; supports µP power-up sequencing across ARM Cortex-M and PIC families |
| Watchdog Timeout | 5.7–9.5ms (normal) or 729–1214ms (extended) via CSWT; accommodates firmware service intervals from 10ms to >1s |
| Operating Temp | −40°C to +125°C; fully specified for under-hood automotive ECUs and industrial motor drives |
| Reset Output | Push-pull active-low; drives µP reset pin directly without external pullup, reducing BOM count and board space |
| MR Input | Internally pulled up (12–28kΩ); accepts direct switch connection with no debounce circuitry required |
Pinout & Package
MAX6747KA29+T is housed in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176), measuring 2.9mm × 1.6mm × 1.1mm, with RoHS-compliant lead finish and thermal resistance θJA = 196°C/W on four-layer board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Manual Reset) | Active-low input with internal 12–28kΩ pullup to VCC; initiates reset when pulled low ≥1µs, immune to 100ns noise spikes |
| 2 | WDS (Watchdog Select) | Logic input selecting normal (GND) or extended (VCC) watchdog mode; state change clears watchdog timer |
| 3 | SWT (Watchdog Timeout) | Capacitor-connected node setting tWD (normal) or tWD×128 (extended); formula tWD = 4.94×10⁶ × CSWT (seconds) |
| 4 | SRT (Reset Timeout) | Capacitor-connected node setting tRP; formula tRP = 4.94×10⁶ × CSRT (seconds); determines reset pulse width after fault clearance |
| 5 | GND | Ground reference for all analog comparators and digital logic; must be low-impedance connection to system ground plane |
| 6 | WDI (Watchdog Input) | Falling-edge sensitive input; resets watchdog timer on each transition; must not float (100kΩ to GND recommended) |
| 7 | RESET | Push-pull active-low output; sinks 50µA at 0.3V max VOL; drives µP reset pin directly without external components |
| 8 | VCC | Power supply input (1.2–5.5V); powers internal comparators, logic, and RESET driver; monitored for 2.925V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.925V threshold | Eliminates external resistor divider for VCC monitoring, reducing component count and layout area in space-constrained modules |
| Capacitor-adjustable tRP and tWD | Enables precise tuning of reset and watchdog timing to match µP boot sequence and firmware loop duration without firmware changes |
| 128× watchdog extension | Supports long-duration firmware tasks (e.g., sensor calibration, OTA updates) while retaining fail-safe supervision |
| AEC-Q100 qualification | Validated for automotive applications including powertrain and ADAS subsystems with zero derating at 125°C junction |
| Transient-immune reset assertion | Rejects 50µs/100mV VCC glitches, preventing spurious resets in noisy engine-bay environments |
Applications
| Automotive Engine Control Unit | Portable Medical Sensor |
|---|---|
Use Scenario: Supervises 2.9V microcontroller powering fuel injector drivers in under-hood ECU exposed to 125°C ambient and load-dump transients. IC Role / Device Role / Timing Role: Monitors VCC for brownout, asserts push-pull RESET to halt unsafe actuation, and services watchdog via WDI strobe during CAN message processing. Use Value: Guarantees reset validity down to VCC = 1V and rejects 50µs supply glitches, preventing misfire events during cranking. | Use Scenario: Powers continuous glucose monitor with ARM Cortex-M0+ MCU running on coin-cell battery for 3+ years. IC Role / Device Role / Timing Role: Provides ultra-low-current (3.7µA) supervision, manual reset via tactile button (MR), and adjustable tRP to accommodate slow ADC initialization. Use Value: Extends battery life by >20% vs. standard supervisors and eliminates need for external reset pullup, saving PCB area. |
| Industrial PLC I/O Module | Battery-Powered Telematics Unit |
Use Scenario: Manages reset sequencing for dual-rail (3.3V/5V) programmable logic controller with isolated field I/O. IC Role / Device Role / Timing Role: Uses MR input for operator-initiated firmware recovery and capacitor-tuned tRP to align with FPGA configuration time. Use Value: Enables field-serviceable firmware updates without hardware rework; push-pull RESET avoids level-shifting complexity. | Use Scenario: Supervises LTE modem and GPS receiver in vehicle tracking device powered by 3.7V Li-ion battery. IC Role / Device Role / Timing Role: Monitors VCC during cold-cranking (4.5V–10V transients), extends watchdog timeout via WDS for GPS acquisition bursts. Use Value: Prevents modem lockup during signal search by extending tWD to 1.2s while maintaining <4µA quiescent current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6746KA29+T | Identical reset threshold (2.925V) and pinout, but lacks MR input; RESET IN pin replaces MR | Requires external resistor divider for manual reset; unsuitable for direct-switch applications | Select MAX6747KA29+T when tactile reset button integration is required without added components |
| TLV803EB29DBZR | Fixed 2.93V threshold, 1.8µA ICC, no watchdog or MR; SOT23-5 package (5 pins vs. 8) | Limited to basic reset-only functions; cannot support watchdog or manual recovery | Choose TLV803EB29DBZR only for cost-sensitive, non-watchdog applications where pin count and quiescent current are primary constraints |
Compared with MAX6746KA29+T and TLV803EB29DBZR, the MAX6747KA29+T uniquely combines factory-trimmed 2.925V reset, integrated MR, push-pull RESET, and 128× extendable watchdog in a single 8-pin SOT23 - enabling compact, robust supervision for automotive and portable systems requiring both reliability and serviceability.
Availability
MAX6747KA29+T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical sensors, industrial PLC I/O modules, and battery-powered telematics units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6747KA29+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 with precision timing and power management solutions.
The MAX6747KA29+T belongs to the MAX6746–MAX6753 family of AEC-Q100 qualified microprocessor supervisors, designed specifically for automotive and industrial applications demanding deterministic reset behavior, ultra-low power consumption, and robust transient immunity.
FAQ
What is the exact reset threshold voltage of the MAX6747KA29+T?
The MAX6747KA29+T features a factory-trimmed VCC reset threshold of 2.925V 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 "29" in the ordering code per Table 2 of the datasheet. The threshold remains stable across temperature, with normalized variation ≤±1.0% from −40°C to +125°C.
Does the MAX6747KA29+T support watchdog functionality, and how is it configured?
Yes, the MAX6747KA29+T supports capacitor-adjustable watchdog timeout with 128× extension. Connect a capacitor between SWT and GND to set the base timeout (tWD = 4.94×10⁶ × CSWT), then tie WDS to VCC for extended mode. The watchdog clears on WDI falling edges or RESET assertion. No external logic is needed - all configuration is analog/pin-strapped, making it ideal for safety-critical firmware supervision.
Can the MAX6747KA29+T operate with supply voltages below 2.0V?
Yes, the MAX6747KA29+T operates from VCC = 1.2V to 5.5V across the full automotive temperature range. At VCC ≤ 2.0V, supply current is 3.7–8µA (typ/max), and RESET remains valid with VOL ≤ 0.3V at ISINK = 50µA. The device guarantees functional reset assertion down to VCC = 1.0V, enabling use in ultra-low-voltage battery-backed systems.
What is the function of the MR pin on the MAX6747KA29+T, and how should it be used?
The MR pin on the MAX6747KA29+T is a manual-reset input with internal 12–28kΩ pullup to VCC. Pulling MR low for ≥1µs asserts RESET for the full tRP period. It rejects 100ns glitches and requires no external debouncing. For tactile button use, connect directly between MR and GND; leave unconnected if unused. This simplifies field-serviceable reset design versus alternatives requiring external pullups.
Is the MAX6747KA29+T qualified for automotive applications, and what standards does it meet?
Yes, the MAX6747KA29+T is AEC-Q100 qualified for automotive applications. It meets Grade 0 requirements (−40°C to +125°C operating temperature), undergoes stress testing per JEDEC JESD22, and is manufactured in ISO/TS 16949-certified facilities. Its transient immunity, guaranteed reset validity down to VCC = 1V, and 125°C operation make it suitable for engine control, body electronics, and ADAS subsystems.
MAX6747KA29+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:
- 2.925V
- 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
MAX6747KA29+T FAQ
1.How can I place an order for MAX6747KA29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6747KA29+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 MAX6747KA29+T reliable?
The price and inventory of MAX6747KA29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6747KA29+T is usually 5 days.
3.What payment methods are accepted for MAX6747KA29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6747KA29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6747KA29+T?
MAX6747KA29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6747KA29+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 MAX6747KA29+T?
For technical support, including MAX6747KA29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6747KA29+T requirements.
6.How does Aetrix verify that MAX6747KA29+T is sourced from the original manufacturer or authorized distributors?
All MAX6747KA29+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 MAX6747KA29+T meets industry standards.
7.What is the process for return or replacement of MAX6747KA29+T?
All MAX6747KA29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6747KA29+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 MAX6747KA29+T part is unused and in its original packaging.
Return procedure for MAX6747KA29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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