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Analog Devices Inc./Maxim Integrated MAX6747KA31/V+T
- Part No.:
- MAX6747KA31/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6747KA31/V+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,993
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Product details
Overview
MAX6747KA31/V+T from Analog Devices is a low-power microprocessor supervisory circuit with factory-trimmed 3.075V 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 VCC drop below threshold or MR pull-down, and provides ±2% threshold accuracy over –40°C to +125°C for automotive-grade embedded controllers.
For engineers reviewing the MAX6747KA31/V+T datasheet, MAX6747KA31/V+T pinout, MAX6747KA31/V+T application, or MAX6747KA31/V+T equivalent, this device supports critical μP monitoring in battery-powered systems requiring transient-immune reset assertion, configurable watchdog timing, and guaranteed RESET validity down to VCC ≥ 1V - with design flexibility via external SRT/SWT capacitors and internal MR pullup.
Technical Context
The MAX6747KA31/V+T implements a dual-path reset detection architecture: one path compares VCC against a factory-trimmed 3.075V threshold (±2%), the other accepts manual reset via internally pulled-up MR pin. Reset assertion persists for a user-defined timeout period (tRP = 4.94×10⁶ × CSRT) after VCC or MR recovers.
Its watchdog function operates in normal mode only (no WDS pin or extended/128× mode), using SWT capacitor to set tWD = 4.94×10⁶ × CSWT, and clears on any falling edge at WDI within that window. Unlike MAX6752/MAX6753, it lacks windowed watchdog logic or SET0/SET1 configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.075V ±2% (factory-trimmed); ensures reliable reset assertion during brownout at nominal 3.3V rail |
| Supply Voltage Range | 1.2V to 5.5V; supports operation across Li-ion, 3.3V, and 5V system rails |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V; enables multi-year battery life in portable medical or sensor nodes |
| Reset Timeout | Adjustable from ~0.5ms to >9ms via CSRT capacitor; matches diverse μP power-up sequences |
| Watchdog Timeout | Adjustable from ~0.5ms to >9ms via CSWT capacitor; allows software service interval tuning without firmware change |
| Operating Temperature | –40°C to +125°C; AEC-Q100 qualified for under-hood automotive and industrial control environments |
| RESET Output Type | Push-pull active-low; eliminates external pullup, simplifies interface to CMOS μP reset inputs |
Pinout & Package
MAX6747KA31/V+T is housed in an 8-pin SOT23 package (Outline 21-0078, Land Pattern 90-0176), optimized for space-constrained automotive and portable PCBs. Thermal resistance is 196°C/W (Junction-to-Ambient, 4-layer board).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Manual Reset Input) | Internally pulled up to VCC; assert reset by pulling low ≥1µs; rejects <100ns glitches |
| 2 | WDS (Watchdog Select) | No-connect (NC) for MAX6747; unused pin - not bonded or functional |
| 3 | SWT (Watchdog Timeout Input) | Capacitor-to-GND sets normal-mode watchdog timeout (tWD = 4.94×10⁶ × CSWT) |
| 4 | SRT (Reset Timeout Input) | Capacitor-to-GND sets reset timeout period (tRP = 4.94×10⁶ × CSRT) |
| 5 | GND | Ground reference for all analog comparators and digital logic |
| 6 | WDI (Watchdog Input) | Falling edge clears watchdog timer; must not float - tie to GND via 100kΩ if unused |
| 7 | RESET | Push-pull active-low output; sinks 50µA @ 0.3V max VOL; valid for VCC ≥ 1V |
| 8 | VCC | Power supply input and monitored voltage rail; absolute max 6.0V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 3.075V reset threshold | Eliminates external resistor divider, reduces BOM count and layout area for single-rail 3.3V systems |
| Integrated MR pullup (12–28kΩ) | Enables direct switch connection without external components; simplifies front-panel reset implementation |
| Capacitor-adjustable tRP and tWD | Permits precise timing alignment to μP boot sequence and firmware watchdog service intervals |
| Power-supply transient immunity | Rejects 50µs transients ≤100mV below VTH - avoids spurious resets in noisy automotive environments |
| Guaranteed RESET validity down to VCC = 1V | Ensures deterministic μP reset state during deep brownout, critical for fail-safe controller recovery |
Applications
| Automotive Engine Control Unit (ECU) | Portable Medical Infusion Pump |
|---|---|
|
Use Scenario: Monitors 3.3V microcontroller supply during cold-cranking when battery dips to 6V, causing regulator ripple and transient sags. IC Role / Device Role / Timing Role: Supervisory IC asserting reset when VCC falls below 3.075V; holds RESET low for 7.6ms (CSRT = 1500pF) to ensure full μP initialization. Use Value: Prevents code execution errors during unstable power conditions; ±2% threshold tolerance ensures consistent trip point across temperature and lifetime. |
Use Scenario: Powers ultra-low-power ARM Cortex-M0+ in battery-operated infusion pump with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Resets μP on power-up and detects firmware hang via WDI strobing every 200ms (CSWT = 330pF → tWD ≈ 1.6ms × 128? No - MAX6747 has no 128× mode; actual tWD = 1.6ms). Use Value: 3.7µA supply current extends battery life; MR pin enables clinician-initiated recalibration reset without opening enclosure. |
| Industrial PLC I/O Module | Smart Energy Meter |
|
Use Scenario: Embedded in DIN-rail mounted PLC module exposed to –40°C ambient and EFT bursts per IEC 61000-4-4. IC Role / Device Role / Timing Role: Provides VCC supervision and manual reset via isolated optocoupler-driven MR signal; push-pull RESET drives μP directly. Use Value: AEC-Q100 qualification validates robustness; transient immunity prevents false resets during 4kV EFT events on adjacent power lines. |
Use Scenario: Monitors 3.3V supply in revenue-grade meter operating 20 years in outdoor utility cabinets with wide thermal cycling. IC Role / Device Role / Timing Role: Asserts reset on VCC sag during transformer inrush or lightning-induced grid dip; uses SRT to guarantee 5ms minimum reset pulse. Use Value: Factory-trimmed threshold eliminates calibration drift; –40°C to +125°C rating ensures reliability across desert and arctic deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6746KA31/V+T | Identical reset threshold (3.075V), same SOT23 package, but lacks MR pin - RESET IN pin used instead for adjustable monitoring | Requires external resistor divider for dual-voltage monitoring; unsuitable where panel-mounted manual reset is required | Select MAX6746KA31/V+T only if manual reset is unnecessary and adjustable VMON monitoring is preferred |
| TLV809E30DBZR | Fixed 3.0V reset threshold (±1.5%), no watchdog or MR; 5-µA ICC; SOT23-3 package | Single-function reset IC only - no timeout adjustability, no WDI, no MR; lower integration, smaller footprint | Choose TLV809E30DBZR for cost-sensitive, space-constrained designs needing basic reset only - no watchdog or manual reset capability |
Compared with MAX6746KA31/V+T, the MAX6747KA31/V+T adds MR functionality at no penalty to threshold accuracy or quiescent current, while TLV809E30DBZR trades away all programmability for minimal size and cost - making MAX6747KA31/V+T optimal for systems requiring both precision reset and field-serviceable manual reset.
Availability
MAX6747KA31/V+T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical devices, industrial PLC modules, smart energy meters, and battery-powered embedded controllers requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX6747KA31/V+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 since 1965.
The MAX6746–MAX6753 family was designed specifically for automotive-grade microprocessor supervision, delivering AEC-Q100 qualified, low-power, capacitor-adjustable reset and watchdog functionality in miniature SOT23 packages.
FAQ
What is the factory-trimmed reset threshold voltage of the MAX6747KA31/V+T?
The MAX6747KA31/V+T features a factory-trimmed VCC reset threshold of 3.075V with ±2% tolerance over –40°C to +125°C. This value is confirmed in Table 2 of the datasheet under suffix "31", and applies exclusively to the VCC monitor path - not the RESET IN input, which is unused in this variant.
Does the MAX6747KA31/V+T support extended watchdog timeout mode?
No, the MAX6747KA31/V+T does not support extended watchdog timeout mode. Its WDS pin is a no-connect (NC); only normal-mode watchdog operation is available, with timeout set solely by the CSWT capacitor (tWD = 4.94×10⁶ × CSWT). Extended mode (128× multiplier) is exclusive to MAX6746–MAX6751 variants with functional WDS pin.
Can the MAX6747KA31/V+T monitor two supply voltages simultaneously?
No, the MAX6747KA31/V+T monitors only the VCC supply voltage using its factory-trimmed 3.075V threshold. It lacks RESET IN functionality (pin 2 is WDS/NC, not RESET IN) and does not support dual-voltage monitoring. For dual-rail supervision, consider MAX6750 or MAX6751 variants instead.
What is the maximum allowable voltage on the MR pin of the MAX6747KA31/V+T?
The MR pin of the MAX6747KA31/V+T is rated for –0.3V to (VCC + 0.3V), per Absolute Maximum Ratings. Since MR is internally pulled up to VCC, applying voltage higher than VCC + 0.3V risks damage. In practice, MR should be driven by a switch to GND or open-drain logic referenced to VCC.
Is the MAX6747KA31/V+T RoHS compliant and lead-free?
Yes, the MAX6747KA31/V+T is RoHS compliant and lead-free. The "+T" suffix in the part number denotes tape-and-reel packaging with RoHS-compliant finish, consistent with Analog Devices' standard environmental compliance for SOT23-packaged products shipped after 2006.
MAX6747KA31/V+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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6747KA31/V+T FAQ
1.How can I place an order for MAX6747KA31/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6747KA31/V+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/V+T reliable?
The price and inventory of MAX6747KA31/V+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/V+T is usually 5 days.
3.What payment methods are accepted for MAX6747KA31/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6747KA31/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6747KA31/V+T?
MAX6747KA31/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6747KA31/V+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/V+T?
For technical support, including MAX6747KA31/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6747KA31/V+T requirements.
6.How does Aetrix verify that MAX6747KA31/V+T is sourced from the original manufacturer or authorized distributors?
All MAX6747KA31/V+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/V+T meets industry standards.
7.What is the process for return or replacement of MAX6747KA31/V+T?
All MAX6747KA31/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6747KA31/V+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/V+T part is unused and in its original packaging.
Return procedure for MAX6747KA31/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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