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Analog Devices Inc./Maxim Integrated MAX6747KA16+T
- Part No.:
- MAX6747KA16+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6747KA16+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,201
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Product details
Overview
MAX6747KA16+T from Analog Devices is a low-power microprocessor supervisory circuit with factory-trimmed 1.575V ±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 systems from 1.2V to 5.5V and operates across the automotive temperature range (–40°C to +125°C), enabling reliable brownout and power-up supervision in battery-powered controllers and embedded automotive modules.
For engineers reviewing the MAX6747KA16+T datasheet, MAX6747KA16+T pinout, MAX6747KA16+T application, or MAX6747KA16+T equivalent, key selection criteria include its fixed 1.575V reset threshold, MR-enabled manual reset capability, SOT23-8 package footprint, and compatibility with capacitor-tuned reset/watchdog delays for μP-based safety-critical monitoring.
Technical Context
The MAX6747KA16+T implements dual independent reset assertion logic: one triggered by VCC falling below 1.575V ±2%, and another activated by pulling the MR pin low. Reset remains asserted for a user-defined timeout period (tRP = 4.94 × 10⁶ × CSRT) after both conditions clear.
Its watchdog timer operates in normal mode only (no WDS pin), with timeout set via external capacitor on SWT (tWD = 4.94 × 10⁶ × CSWT), and clears on any WDI falling edge or RESET assertion. Unlike MAX6752/MAX6753, it lacks windowed watchdog functionality or SET0/SET1 configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 1.575V ±2% at –40°C to +125°C - ensures precise brownout detection without external resistor divider |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V - enables multi-year operation in coin-cell–powered systems |
| Reset Timeout Range | 0.506ms to 9.487ms (CSRT = 100pF to 1500pF) - supports fast boot or extended initialization sequences |
| Watchdog Timeout Range | 0.506ms to 9.487ms (CSWT = 100pF to 1500pF) - matches typical firmware service intervals |
| Operating Temperature | –40°C to +125°C - AEC-Q100 qualified for under-hood automotive use |
| VCC Range | 1.2V to 5.5V - supports Li-ion, 3.3V, and 5V system rails |
| RESET Output Type | Push-pull active-low - eliminates need for external pullup and ensures defined logic state down to VCC = 1V |
Pinout & Package
MAX6747KA16+T is housed in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176), optimized for space-constrained PCB layouts in portable and automotive electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Manual Reset) | Internally pulled up to VCC; assert low ≥1µs to trigger reset - enables switch-based or logic-controlled reset initiation without external components |
| 2 | WDS | No-connect (NC) - unused in MAX6747; differs from MAX6746/MAX6748–MAX6751 which use WDS for watchdog extension |
| 3 | SWT | Watchdog timeout capacitor node - sets tWD = 4.94 × 10⁶ × CSWT; connect to GND to disable watchdog |
| 4 | SRT | Reset timeout capacitor node - sets tRP = 4.94 × 10⁶ × CSRT; determines duration RESET stays low after fault clearance |
| 5 | GND | Ground reference - shared return path for VCC, RESET, and all internal comparators |
| 6 | WDI | Watchdog input - falling edge resets watchdog timer; must not float; 100kΩ pulldown recommended if unused |
| 7 | RESET | Push-pull active-low reset output - drives μP reset pin directly; valid logic state guaranteed for VCC ≥ 1V |
| 8 | VCC | Power supply input - powers internal circuitry and serves as monitored voltage rail for fixed-threshold reset detection |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 1.575V reset threshold | ±2% accuracy over –40°C to +125°C eliminates calibration effort and external resistors for VCC monitoring |
| Integrated manual-reset input (MR) | Internal 12–28kΩ pullup enables direct switch connection - no external pullup or debounce required |
| Capacitor-adjustable reset and watchdog timeouts | Independent CSRT and CSWT pins allow precise tuning of tRP and tWD to match μP boot time and firmware loop timing |
| Push-pull RESET output | Drives μP reset pin directly without pullup resistor - reduces BOM count and ensures deterministic state during VCC ramp-down |
| Power-supply transient immunity | Rejects 100mV transients lasting ≤50µs - prevents spurious resets in noisy automotive or industrial environments |
Applications
| Automotive Body Control Module | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply in door module ECUs exposed to load-dump transients and cold-crank voltage dips. IC Role / Device Role / Timing Role: Supervises VCC and provides manual reset via CAN command; asserts RESET for 7.6ms (CSRT = 1500pF) during brownout recovery. Use Value: Prevents erratic MCU behavior during 6V–16V battery fluctuations; MR pin enables remote reset via diagnostic interface. |
Use Scenario: Ensures safe restart of ARM-based pump controller after battery insertion or low-voltage interruption. IC Role / Device Role / Timing Role: Detects 1.575V VCC threshold violation and initiates 5.7ms reset pulse (CSRT = 1000pF); MR pin accepts nurse-initiated reset. Use Value: Guarantees deterministic boot state before motor activation; push-pull RESET avoids floating reset line during battery swap. |
| Industrial PLC I/O Submodule | Portable Data Logger |
Use Scenario: Supervises 2.5V FPGA configuration supply in DIN-rail mounted I/O cards subject to EFT bursts. IC Role / Device Role / Timing Role: Provides VCC reset with 1.575V threshold and 8.5ms timeout (CSRT = 1500pF); WDI strobed every 20ms by FPGA firmware. Use Value: Detects undervoltage before FPGA config corruption; watchdog timeout matches firmware heartbeat interval. |
Use Scenario: Manages cold-start reliability of MSP430-based logger powered by CR2032 coin cell (2.0–3.0V). IC Role / Device Role / Timing Role: Monitors VCC with 1.575V threshold and asserts RESET for 1.2ms (CSRT = 200pF); MR pin used for button-initiated data flush/reset. Use Value: Enables ultra-low ICC (3.7µA) while guaranteeing valid reset down to 1.2V - extends battery life beyond 5 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6746KA16+T | Identical reset threshold (1.575V), same SOT23-8 package, but lacks MR pin - uses RESET IN instead | Requires external resistor divider for manual reset; unsuitable where direct switch interface is needed | Select MAX6747KA16+T when board-level manual reset via switch is required without added components |
| TPS3808G16DBVR | 1.6V fixed reset threshold (±0.5%), 1.8–6.0V VCC range, 2.5µA ICC, but no MR pin and only open-drain RESET | Needs external pullup; less accurate threshold; no native manual reset - requires GPIO-driven reset circuit | Choose TPS3808G16DBVR only if lower quiescent current and tighter threshold tolerance outweigh MR and push-pull requirements |
Compared with MAX6746KA16+T, the MAX6747KA16+T adds integrated MR functionality without sacrificing accuracy or package size; versus TPS3808G16DBVR, it trades minor ICC reduction for essential MR support and push-pull drive - critical for cost-sensitive, component-count-constrained designs.
Availability
MAX6747KA16+T is available at Aetrix Electronics and suitable for automotive body control modules, medical infusion pump controllers, industrial PLC I/O submodules, and portable data loggers requiring stable component supply with AEC-Q100 qualification and long-term production continuity.
Supply support for MAX6747KA16+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 robust, low-power microprocessor supervision in harsh environments - emphasizing precision reset thresholds, capacitor-tunable timing, and AEC-Q100 compliance for automotive and critical embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX6747KA16+T?
The MAX6747KA16+T features a factory-trimmed VCC reset threshold of 1.575V with ±2% tolerance over the full operating temperature range (–40°C to +125°C), as confirmed in the Electrical Characteristics table and Selector Guide. This value is fixed and does not require external resistor programming - the "16" suffix in the part number explicitly denotes the 1.575V threshold variant.
Does the MAX6747KA16+T support watchdog timer extension via WDS?
No, the MAX6747KA16+T does not support watchdog extension via WDS. Pin 2 (WDS) is a no-connect (NC) in this variant. The MAX6747KA16+T implements only the basic watchdog timeout (tWD = 4.94 × 10⁶ × CSWT) without 128× extension - that feature is exclusive to MAX6746–MAX6751 variants with functional WDS pins.
Can the MAX6747KA16+T monitor two supply voltages simultaneously?
No, the MAX6747KA16+T monitors only the VCC supply voltage using its fixed 1.575V threshold. It does not include the RESET IN pin or adjustable threshold comparator found in MAX6748–MAX6751, nor does it support dual-voltage monitoring like MAX6750/MAX6751. Its function is strictly single-rail VCC supervision with manual reset.
What is the minimum pulse width required on the MR pin to trigger reset in the MAX6747KA16+T?
The MR pin of the MAX6747KA16+T requires a minimum low pulse width of 1µs to reliably assert the RESET output. This specification is guaranteed across the full temperature range and is documented in the Electrical Characteristics table under "MR Minimum Pulse Width." Shorter pulses may be rejected due to built-in 100ns glitch rejection.
Is the RESET output of the MAX6747KA16+T compatible with 1.8V microcontrollers?
Yes, the push-pull RESET output of the MAX6747KA16+T is fully compatible with 1.8V microcontrollers. When asserted (low), VOL is guaranteed ≤0.3V at ISINK = 50µA for VCC ≥ 1.0V - well within 1.8V logic low thresholds. When deasserted (high), VOH = 0.8 × VCC, so at VCC = 1.8V, VOH ≥ 1.44V - meeting standard 1.8V CMOS high-level input requirements.
MAX6747KA16+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:
- 1.575V
- 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
MAX6747KA16+T FAQ
1.How can I place an order for MAX6747KA16+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6747KA16+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 MAX6747KA16+T reliable?
The price and inventory of MAX6747KA16+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6747KA16+T is usually 5 days.
3.What payment methods are accepted for MAX6747KA16+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6747KA16+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6747KA16+T?
MAX6747KA16+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6747KA16+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 MAX6747KA16+T?
For technical support, including MAX6747KA16+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6747KA16+T requirements.
6.How does Aetrix verify that MAX6747KA16+T is sourced from the original manufacturer or authorized distributors?
All MAX6747KA16+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 MAX6747KA16+T meets industry standards.
7.What is the process for return or replacement of MAX6747KA16+T?
All MAX6747KA16+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6747KA16+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 MAX6747KA16+T part is unused and in its original packaging.
Return procedure for MAX6747KA16+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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