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Analog Devices Inc./Maxim Integrated MAX6747KA45+T
- Part No.:
- MAX6747KA45+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6747KA45+T.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
- Shipping:
Inventory:19,925
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Product details
Overview
MAX6747KA45+T from Analog Devices is a low-power microprocessor supervisory circuit with factory-trimmed 4.5V reset threshold, manual-reset input (MR), push-pull active-low RESET output, and capacitor-adjustable reset timeout (tRP) and watchdog timeout (tWD). It monitors VCC supply voltage (1.2V–5.5V), asserts reset on undervoltage or MR activation, and provides ±2% threshold accuracy over –40°C to +125°C for automotive-grade embedded controllers.
For engineers reviewing the MAX6747KA45+T datasheet, MAX6747KA45+T pinout, MAX6747KA45+T application, or MAX6747KA45+T equivalent, this device delivers configurable reset/watchdog timing, transient-immune operation down to VCC ≥ 1V, AEC-Q100 qualification, and dual-mode watchdog (normal/extended) in an 8-pin SOT23 package - critical for battery-powered medical instruments and automotive ECUs requiring deterministic power-on reset behavior.
Technical Context
The MAX6747KA45+T implements a fixed 4.5V VCC reset comparator with ±2% tolerance and 0.8% hysteresis, paired with a manual-reset input (MR) internally pulled up to VCC and rejecting <100ns glitches. Its reset timeout period (tRP) and watchdog timeout (tWD) are set independently via external capacitors CSRT and CSWT using t = 4.94×10⁶ × C (seconds/Farads).
It supports normal watchdog mode only (no windowed watchdog or SET0/SET1 pins), with WDS pin enabling 128× extended timeout when pulled high. The push-pull RESET output guarantees valid logic state for VCC ≥ 1V, sinks 50µA at VOL ≤ 0.3V, and sources 200µA at VOH ≥ 0.8×VCC, eliminating need for external pull-up resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.5V ±2% (factory-trimmed); ensures precise brownout detection for 5V systems without external resistor divider |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V; enables multi-year battery life in portable medical sensors |
| Reset Timeout Range | 0.506ms to 9.487ms (CSRT = 100pF to 1500pF); covers µP power-up delays from fast MCUs to legacy processors |
| Watchdog Timeout Range | 0.506ms–9.487ms (normal mode), 64.77ms–1214.4ms (extended mode); supports both firmware service intervals and long idle periods |
| Operating Temp | –40°C to +125°C; fully specified for under-hood automotive applications and industrial control environments |
| VCC Range | 1.2V to 5.5V; compatible with 1.8V, 3.3V, and 5V logic domains without level-shifting |
| Reset Output Type | Push-pull active-low; eliminates external pull-up, reduces BOM count, and ensures clean logic transitions |
Pinout & Package
MAX6747KA45+T is housed in an 8-pin SOT23 package (package code K8+5A, outline 21-0078), measuring 2.9mm × 1.6mm × 1.1mm, with RoHS-compliant lead finish and 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; assert low ≥1µs to trigger reset; rejects <100ns noise pulses |
| 2 - WDS | Watchdog Select Input | Pull low for normal watchdog timeout; pull high to extend timeout by 128×; clears watchdog timer on transition |
| 3 - SWT | Watchdog Timeout Input | Connect capacitor to GND; sets tWD = 4.94×10⁶ × C; connect to GND to disable watchdog |
| 4 - SRT | Reset Timeout Input | Connect capacitor to GND; sets tRP = 4.94×10⁶ × C; determines minimum reset pulse width |
| 5 - GND | Ground Reference | Primary return path for all internal circuits and external timing capacitors |
| 6 - WDI | Watchdog Input | Falling edge resets watchdog timer; must not float; 100kΩ pull-down recommended if unused |
| 7 - RESET | Active-Low Reset Output | Push-pull driver; asserts low during reset conditions; guaranteed valid for VCC ≥ 1V |
| 8 - VCC | Supply Voltage Input | Power source and monitored rail; accepts 1.2V–5.5V; powers internal comparators and logic |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Trimmed 4.5V Threshold | Eliminates external resistor network, saves PCB space, and ensures ±2% accuracy across automotive temperature range |
| Capacitor-Adjustable Timing | Independent tuning of reset (SRT) and watchdog (SWT) timeouts via low-leakage ceramic capacitors - no trimming required |
| Manual-Reset Input with Debounce | MR pin includes internal pull-up and 100ns glitch rejection, enabling direct switch connection without RC filter |
| Transient-Immune Reset Logic | Withstands VCC transients ≤50µs at 100mV below threshold - prevents spurious resets in noisy automotive environments |
| AEC-Q100 Qualified | Qualified to Grade 0 (–40°C to +125°C), supporting safety-critical automotive applications including body control modules |
Applications
| Automotive Body Control Module | Portable Medical Infusion Pump |
|---|---|
Use Scenario: Monitors 5V supply and initiates controlled MCU reset during ignition cycling or load-dump events. IC Role / Device Role / Timing Role: Supervisory IC providing VCC-monitored reset and manual-restart capability via dashboard switch. Use Value: Ensures deterministic boot sequence after voltage sag; 4.5V threshold matches nominal 5V rail; 125°C rating survives under-dash placement. |
Use Scenario: Powers ultra-low-power ARM Cortex-M0+ controller in battery-operated infusion pump with strict safety reset requirements. IC Role / Device Role / Timing Role: Resets MCU on battery voltage drop below 4.5V and enables clinician-initiated restart via front-panel button. Use Value: 3.7µA quiescent current extends single-cell Li-ion runtime; MR pin allows safe, debounced user reset without firmware involvement. |
| Industrial PLC I/O Module | Smart Energy Meter |
Use Scenario: Provides robust reset supervision for isolated communication processor in DIN-rail mounted PLC module exposed to EMI and wide ambient swings. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors local 3.3V logic supply and accepts remote reset command via optocoupler-driven MR pin. Use Value: Push-pull RESET drives opto-LED directly; ±2% threshold ensures reliable operation at 85°C ambient; AEC-Q100 grade validates long-term reliability. |
Use Scenario: Guarantees secure, tamper-resistant boot sequence in revenue-grade electricity meter operating 24/7 in outdoor enclosures. IC Role / Device Role / Timing Role: Primary reset generator with watchdog monitoring firmware execution; CSRT/CSWT tuned for 100ms reset and 2s watchdog windows. Use Value: Extended watchdog mode (WDS = VCC) enables 256s timeout for deep-sleep firmware cycles; 125°C rating supports sealed meter housing temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6746KA45+T | Identical 4.5V threshold, same SOT23 package, but lacks MR pin - only VCC/RESET IN monitoring | Suitable where manual reset is unnecessary (e.g., headless embedded gateways) | Select MAX6747KA45+T when operator-initiated reset is required; MAX6746KA45+T reduces pin count if MR unused |
| TPS3808G33DBVR | 3.3V fixed threshold, 1.8µA ICC, open-drain RESET, no MR pin, no adjustable watchdog | Targeted at low-voltage 3.3V systems without watchdog or manual reset needs | Choose TPS3808G33DBVR for cost-sensitive 3.3V-only designs; MAX6747KA45+T preferred for 4.5V rails, MR, and watchdog flexibility |
Compared with MAX6746KA45+T and TPS3808G33DBVR, MAX6747KA45+T uniquely combines factory-trimmed 4.5V reset, integrated manual-reset input, and capacitor-tunable watchdog - making it optimal for automotive and portable medical devices requiring field-serviceable restart and adaptive firmware supervision.
Availability
MAX6747KA45+T is available at Aetrix Electronics and suitable for automotive body control modules, portable medical infusion pumps, industrial PLC I/O modules, smart energy meters, and battery-powered embedded controllers requiring stable component supply across extended temperature ranges.
Supply support for MAX6747KA45+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 instrumentation, industrial automation, automotive, and healthcare markets.
The MAX6746–MAX6753 family was designed specifically for automotive and industrial microprocessor supervision, delivering AEC-Q100 qualified, low-quiescent-current reset and watchdog functionality with flexible timing and robust transient immunity.
FAQ
What is the factory-trimmed reset threshold voltage of the MAX6747KA45+T?
The MAX6747KA45+T features a factory-trimmed VCC reset threshold of 4.5V with ±2% tolerance over –40°C to +125°C, as confirmed by Table 2 (suffix "45") and Electrical Characteristics section. This value is laser-trimmed during production and requires no external components to achieve precise 4.5V brownout detection - critical for 5V system integrity in automotive applications.
Does the MAX6747KA45+T support windowed watchdog functionality?
No, the MAX6747KA45+T does not support windowed watchdog functionality. Per the Selector Guide and Pin Configurations, it belongs to the MAX6746–MAX6751 group, which implements only standard (non-windowed) watchdog with normal/extended modes via WDS. Windowed watchdog (tWD1/tWD2) is exclusive to MAX6752/MAX6753 variants with SET0/SET1 pins - not present on MAX6747KA45+T.
How is the reset timeout period adjusted on the MAX6747KA45+T?
The reset timeout period (tRP) on MAX6747KA45+T is adjusted by connecting a capacitor (CSRT) between the SRT pin (Pin 4) and GND. The relationship is tRP = 4.94 × 10⁶ × CSRT (seconds/Farads), yielding 0.506ms at 100pF and 9.487ms at 1500pF. Ceramic capacitors with leakage <10nA are required; values are validated in the Electrical Characteristics table under "Reset Timeout Period".
What is the function of the WDS pin on the MAX6747KA45+T?
The WDS (Watchdog Select) pin on MAX6747KA45+T selects watchdog timeout mode: pulled low for normal timeout (tWD), pulled high to extend timeout by 128×. A state change on WDS clears the watchdog timer. This pin is absent on MAX6752/MAX6753 (replaced by SET0/SET1) and confirms MAX6747KA45+T's membership in the MAX6746–MAX6751 series per Pin Descriptions and Selector Guide.
Is the MAX6747KA45+T AEC-Q100 qualified?
Yes, the MAX6747KA45+T is AEC-Q100 qualified, as explicitly stated in the "Benefits and Features" section ("AEC-Q100 Qualified") and supported by full specification over –40°C to +125°C (automotive temperature range). This qualification applies to the entire MAX6746–MAX6753 family, including all suffix variants like KA45+T, and is verified per AEC-Q100 Rev H stress testing protocols.
MAX6747KA45+T 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:
- -
MAX6747KA45+T FAQ
1.How can I place an order for MAX6747KA45+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6747KA45+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 MAX6747KA45+T reliable?
The price and inventory of MAX6747KA45+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6747KA45+T is usually 5 days.
3.What payment methods are accepted for MAX6747KA45+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6747KA45+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6747KA45+T?
MAX6747KA45+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6747KA45+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 MAX6747KA45+T?
For technical support, including MAX6747KA45+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6747KA45+T requirements.
6.How does Aetrix verify that MAX6747KA45+T is sourced from the original manufacturer or authorized distributors?
All MAX6747KA45+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 MAX6747KA45+T meets industry standards.
7.What is the process for return or replacement of MAX6747KA45+T?
All MAX6747KA45+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6747KA45+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 MAX6747KA45+T part is unused and in its original packaging.
Return procedure for MAX6747KA45+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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