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Analog Devices Inc./Maxim Integrated MAX6747KA45+
- Part No.:
- MAX6747KA45+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6747KA45+.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
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Product details
Overview
MAX6747KA45+ 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/watchdog timeout. It monitors VCC supply voltage (1.2V–5.5V), asserts reset on VCC drop below 4.5V ±2%, and supports automotive-grade operation from –40°C to +125°C. Used in battery-powered controllers and embedded systems requiring reliable power-on reset and operator-initiated recovery.
For engineers reviewing the MAX6747KA45+ datasheet, MAX6747KA45+ pinout, MAX6747KA45+ application, or MAX6747KA45+ equivalent, this page delivers verified electrical parameters, SOT23-8 pin mapping, automotive temperature compliance, watchdog timing equations, and real-world substitution guidance - all grounded in Analog Devices' official MAX6746–MAX6753 family documentation.
Technical Context
The MAX6747KA45+ implements dual-supervision logic: a precision bandgap-based VCC monitor with ±2% threshold accuracy at 4.5V and an internal MR comparator with 1μs minimum pulse width and 100ns glitch rejection. Its reset timeout (tRP) and watchdog timeout (tWD) are independently set via external capacitors CSRT and CSWT using linear scaling formulas (tRP = 4.94×10⁶ × CSRT).
This variant belongs to the MAX6746–MAX6751 subgroup: it features normal/extended watchdog mode selection via WDS pin, no windowed watchdog (unlike MAX6752/MAX6753), and lacks SET0/SET1 pins. The push-pull RESET output guarantees valid logic down to VCC = 1V and sinks 50µA at VOL ≤ 0.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.5V ±2% (factory-trimmed); ensures deterministic reset assertion during 4.41V–4.59V VCC brownout. |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V; enables multi-year battery life in portable medical or sensor nodes. |
| Reset Timeout Range | 0.506ms to 9.487ms (CSRT = 100pF to 1500pF); covers µP initialization windows from fast MCUs to legacy 8051 derivatives. |
| 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; qualified per AEC-Q100 Grade 0, suitable for under-hood automotive ECUs and industrial motor drives. |
| VCC Range | 1.2V to 5.5V (–40°C to 0°C), 1.0V to 5.5V (0°C to +125°C); powers from single Li-ion cell up to 5V rail without external regulators. |
| RESET Output Type | Push-pull active-low; eliminates external pull-up resistor, reduces BOM count, and ensures monotonic high-to-low transition at VCC ≥ 1V. |
Pinout & Package
MAX6747KA45+ is housed in an 8-pin SOT23 package (Outline 21-0078, RoHS-compliant). Pinout follows standard top-view orientation with GND at Pin 5 and VCC at Pin 8.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Manual Reset Input) | Internally pulled up to VCC; assert reset by pulling low ≥1μs; immune to <100ns transients; no external R required. |
| 2 | WDS (Watchdog Select) | Selects normal (GND) or extended (VCC) watchdog timeout; state change clears watchdog timer. |
| 3 | SWT (Watchdog Timeout Input) | Connect capacitor to GND; sets tWD = 4.94×10⁶ × CSWT (seconds); short to GND disables watchdog. |
| 4 | SRT (Reset Timeout Input) | Connect capacitor to GND; sets tRP = 4.94×10⁶ × CSRT (seconds); determines reset pulse duration after fault clearance. |
| 5 | GND | Ground reference for all analog comparators, digital inputs, and RESET output driver. |
| 6 | WDI (Watchdog Input) | Falling edge resets watchdog timer; must not float; 300ns minimum pulse width; ignored during RESET assertion. |
| 7 | RESET | Push-pull active-low output; drives µP reset pin directly; VOL ≤ 0.3V @ 50µA sink; VOH ≥ 0.8×VCC when deasserted. |
| 8 | VCC | Power supply input and monitored voltage source; operates down to 1.0V; supplies internal bandgap and logic. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Trimmed 4.5V Threshold | Eliminates external resistor divider for VCC monitoring; reduces component count and layout area in single-rail systems. |
| Capacitor-Adjustable Timing | Independent tuning of reset (SRT) and watchdog (SWT) timeouts via ceramic capacitors; enables precise match to µP boot/firmware cycles. |
| Manual Reset with Internal Pullup | Direct switch connection to MR pin; no external pullup or debounce needed; simplifies front-panel or test-point reset implementation. |
| Power-Supply Transient Immunity | Rejects VCC glitches ≤50µs at 100mV overdrive; prevents spurious resets in noisy automotive or industrial power environments. |
| AEC-Q100 Qualified | Validated for automotive applications; meets stress testing, thermal cycling, and reliability requirements per Grade 0 specification. |
Applications
| Automotive Body Control Module | Portable Medical Infusion Pump |
|---|---|
|
Use Scenario: Microcontroller supervises solenoid actuation, sensor polling, and battery management in a CAN-connected BCM. IC Role / Device Role / Timing Role: MAX6747KA45+ monitors 5V system rail and provides push-pull reset pulse upon undervoltage or manual service trigger. Use Value: Guarantees deterministic MCU restart after load-dump transients; eliminates need for external RC network due to factory-trimmed 4.5V threshold. |
Use Scenario: Battery-powered infusion pump uses ultra-low-power ARM Cortex-M0+ to control motor and display. IC Role / Device Role / Timing Role: MAX6747KA45+ asserts reset if Li-ion voltage drops below 4.5V or if user presses emergency stop button (MR). Use Value: 3.7µA supply current extends battery life; push-pull RESET avoids leakage path through external pull-up, critical for >5-year shelf life. |
| Industrial PLC I/O Expansion Card | Smart Energy Meter Communication Module |
|
Use Scenario: DIN-rail mounted PLC adds RS-485 and digital I/O via hot-pluggable expansion card with local µP. IC Role / Device Role / Timing Role: MAX6747KA45+ monitors local 3.3V LDO output and provides reset to expansion µP during power-up sequencing. Use Value: Capacitor-adjustable tRP (0.5–9.5ms) matches FPGA configuration time; -40°C to +125°C rating ensures operation in uncooled enclosures. |
Use Scenario: PLC-controlled energy meter includes NB-IoT modem that must reboot cleanly after power interruption. IC Role / Device Role / Timing Role: MAX6747KA45+ watches 5V modem supply and triggers watchdog reset if firmware hangs during OTA update. Use Value: Extended-mode watchdog (128× base) allows 65s timeout for slow modem boot; WDS pin enables runtime mode switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6746KA45+ | Identical 4.5V threshold, SOT23-8, push-pull RESET, but lacks MR pin (Pin 1 is NC); no manual reset capability. | Suitable only where software or external logic handles reset initiation; cannot replace MAX6747KA45+ in designs requiring physical reset button. | Select MAX6746KA45+ only if MR functionality is unused and board layout allows pin-1 omission. |
| TLV809E45DBVR | 4.5V fixed threshold, SOT23-3, open-drain RESET, no watchdog or MR; 1.8–6V VCC range; ±1.5% threshold accuracy. | Limited to basic power-on reset; no timeout adjustment, no watchdog, no manual reset; requires external pull-up. | Choose TLV809E45DBVR for cost-sensitive, space-constrained applications needing only VCC monitoring without supervision features. |
Compared with MAX6746KA45+, MAX6747KA45+ adds essential MR functionality for field serviceability; versus TLV809E45DBVR, it delivers full supervision (watchdog, adjustable timing, push-pull drive) at modest BOM cost premium - justifying use in safety-critical or firmware-reliant systems.
Availability
MAX6747KA45+ is available at Aetrix Electronics and suitable for automotive body control modules, portable medical devices, industrial PLC expansion cards, and smart energy meter communication modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6747KA45+ 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 robust microprocessor supervision in harsh environments, emphasizing low quiescent current, AEC-Q100 qualification, and flexible reset/watchdog configurability for embedded control applications.
FAQ
What is the exact reset threshold voltage of the MAX6747KA45+?
The MAX6747KA45+ has a factory-trimmed VCC reset threshold of 4.5V with ±2% tolerance over –40°C to +125°C, meaning the actual trip point falls between 4.41V and 4.59V. This value is specified in Table 2 of the datasheet under suffix "45", and applies exclusively to the VCC monitor - not the RESET IN input, which is unused in this variant.
Does the MAX6747KA45+ support watchdog functionality, and how is it configured?
Yes, the MAX6747KA45+ supports configurable watchdog timing via the SWT and WDS pins. Connect a capacitor between SWT and GND to set the base timeout (tWD = 4.94×10⁶ × CSWT); tie WDS to GND for normal mode or to VCC for 128× extended mode. The WDI pin must receive falling edges within tWD to prevent reset assertion.
Can the MAX6747KA45+ operate with supply voltages below 1.8V?
Yes, the MAX6747KA45+ operates down to 1.0V at temperatures from 0°C to +125°C and down to 1.2V at –40°C to 0°C. Its 3.7µA typical supply current at VCC ≤ 2.0V and guaranteed RESET validity down to VCC = 1V make it suitable for single-cell Li-ion or NiMH battery systems where brownout protection is critical.
What is the purpose of the MR pin on the MAX6747KA45+, and does it require an external pull-up resistor?
The MR (Manual Reset) pin on the MAX6747KA45+ allows external hardware reset initiation - for example, via a front-panel pushbutton. It features an internal pull-up to VCC, so no external resistor is needed. A low pulse ≥1μs on MR asserts RESET for the full timeout period; the pin rejects transients <100ns, enhancing noise immunity in industrial settings.
How does the push-pull RESET output of the MAX6747KA45+ differ from open-drain alternatives?
The MAX6747KA45+ uses a push-pull RESET output, actively driving low during reset and high when deasserted - eliminating the need for an external pull-up resistor. This reduces BOM cost and PCB area, improves noise immunity by avoiding floating states, and guarantees valid logic levels down to VCC = 1V, unlike open-drain variants that require external biasing.
MAX6747KA45+ 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+ FAQ
1.How can I place an order for MAX6747KA45+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6747KA45+ 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+ reliable?
The price and inventory of MAX6747KA45+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6747KA45+ is usually 5 days.
3.What payment methods are accepted for MAX6747KA45+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6747KA45+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6747KA45+?
MAX6747KA45+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6747KA45+ 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+?
For technical support, including MAX6747KA45+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6747KA45+ requirements.
6.How does Aetrix verify that MAX6747KA45+ is sourced from the original manufacturer or authorized distributors?
All MAX6747KA45+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6747KA45+?
All MAX6747KA45+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6747KA45+, 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+ part is unused and in its original packaging.
Return procedure for MAX6747KA45+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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