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Analog Devices Inc./Maxim Integrated MAX6746KA29+T
- Part No.:
- MAX6746KA29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6746KA29+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:6,303
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Product details
Overview
MAX6746KA29+T from Analog Devices is a low-power microprocessor supervisory circuit with factory-trimmed 2.925V ±2% VCC reset threshold, capacitor-adjustable 5.7–9.5ms reset timeout (CSRT = 1500pF), and normal-mode watchdog timeout (5.7–9.5ms, CSWT = 1500pF). It features push-pull active-low RESET output, manual-reset input (MR), and operates across -40°C to +125°C for automotive-grade power monitoring in battery-powered controllers and embedded systems.
For engineers reviewing the MAX6746KA29+T datasheet, MAX6746KA29+T pinout, MAX6746KA29+T application, or MAX6746KA29+T equivalent, this device delivers precise single-supply monitoring with transient-immune reset assertion, configurable watchdog timing, and AEC-Q100 qualification - critical for reliable μP startup and brownout recovery in safety-conscious designs.
Technical Context
The MAX6746KA29+T implements a precision bandgap-based reset comparator with 2.925V nominal threshold (±2% over -40°C to +125°C) and 0.8% hysteresis, ensuring stable release after voltage recovery. Its reset timeout is set via external capacitor on SRT pin using tRP = 4.94 × 10⁶ × CSRT (seconds), supporting 0.5–9.5ms range.
It integrates a single-mode watchdog timer with normal timeout (tWD = 4.94 × 10⁶ × CSWT) and WDS pin for 128× extended mode. The MR input includes 1μs minimum pulse width requirement and 100ns glitch rejection, with internal VCC pullup eliminating external biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.925V ±2% (factory-trimmed); ensures accurate brownout detection at 2.925V across full automotive temperature range |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V; enables ultra-low-power operation in battery-backed systems |
| Reset Timeout Period | 5.692–9.487ms (CSRT = 1500pF); provides sufficient hold time for μP initialization sequences |
| Watchdog Timeout (Normal) | 5.692–9.487ms (CSWT = 1500pF); matches typical firmware service intervals without requiring extended mode |
| Operating Temperature | -40°C to +125°C; fully specified for under-hood automotive and industrial embedded environments |
| RESET Output Type | Push-pull active-low; drives μP reset pin directly without external pullup, valid down to VCC ≥ 1V |
| Reset Immunity | Guaranteed no false reset for transients ≤50µs at 100mV below VTH; suppresses common supply noise |
Pinout & Package
MAX6746KA29+T is housed in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176), optimized for space-constrained PCB layouts in automotive and portable applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Manual Reset Input | Pull low to assert RESET; internally pulled up to VCC, requires ≥1μs pulse width, rejects <100ns glitches |
| 2 - WDS | Watchdog Select Input | GND = normal mode (tWD), VCC = extended mode (128×tWD); state change clears watchdog timer |
| 3 - SWT | Watchdog Timeout Input | Capacitor-to-GND sets tWD (normal) or tWD2 (extended); connect to GND to disable watchdog |
| 4 - SRT | Reset Timeout Input | Capacitor-to-GND sets tRP; tRP = 4.94 × 10⁶ × CSRT (seconds), supports 0.5–9.5ms range |
| 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; 300ns minimum pulse width required |
| 7 - RESET | Active-Low Reset Output | Push-pull driver; asserts low during VCC/RESET IN undervoltage or MR/WDT fault; valid ≥1V VCC |
| 8 - VCC | Supply Voltage Input | 1.0–5.5V operation; powers internal circuitry and serves as monitored rail for fixed-threshold reset |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Trimmed Reset Threshold | 2.925V ±2% over -40°C to +125°C eliminates need for external resistor divider calibration |
| Capacitor-Adjustable Timing | Independent SRT and SWT pins enable precise, board-level tuning of reset and watchdog timeouts |
| Transient-Immune Reset Logic | Rejects ≤50µs supply glitches at 100mV below VTH, reducing false resets in noisy automotive environments |
| Integrated Manual Reset | MR pin with internal VCC pullup and 100ns glitch rejection simplifies front-panel or logic-initiated reset design |
| AEC-Q100 Qualified | Qualified per AEC-Q100 Rev G Grade 0 (-40°C to +125°C), enabling use in automotive powertrain and body electronics |
Applications
| Automotive Body Control Module | Battery-Powered Medical Monitor |
|---|---|
|
Use Scenario: Monitors 3.3V MCU supply and initiates safe shutdown during ignition transients or battery sag. IC Role / Device Role / Timing Role: Primary VCC supervisor asserting reset when supply drops below 2.925V; provides 7.6ms hold time for controlled firmware restart. Use Value: Prevents erratic MCU behavior during cold-crank events by guaranteeing reset assertion until supply stabilizes above threshold. |
Use Scenario: Ensures reliable boot sequence in portable ECG device powered by single Li-ion cell (2.8–4.2V). IC Role / Device Role / Timing Role: Single-rail supervisor with 2.925V threshold tracking minimum operating voltage of analog front-end and MCU. Use Value: Eliminates risk of corrupted memory writes or sensor misreads during battery depletion by enforcing hard reset before undervoltage lockout. |
| Industrial PLC I/O Module | Smart Energy Meter Controller |
|
Use Scenario: Guards against brownout-induced firmware crashes in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Dual-function supervisor providing both power-on reset and periodic watchdog supervision of real-time task scheduler. Use Value: Enables deterministic recovery from transient grid sags without requiring external RC networks or microcontroller intervention. |
Use Scenario: Maintains secure boot integrity in revenue-grade meter during utility voltage fluctuations and load switching transients. IC Role / Device Role / Timing Role: AEC-Q100 qualified reset IC asserting clean reset signal to ARM Cortex-M4 core upon VCC dip below 2.925V. Use Value: Meets IEC 62053-21 accuracy requirements by preventing register corruption during sub-cycle voltage dips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6747KA29+T | Same 2.925V threshold and timing, but open-drain RESET output instead of push-pull | Requires external pullup resistor; suitable for level-shifting or wired-OR reset bus configurations | Select MAX6747KA29+T only when interfacing to mixed-voltage systems or shared reset lines |
| TLV803EB29DBZR | 2.93V threshold (±1%), fixed 200ms reset timeout, no watchdog or manual reset | Limited to basic power-on reset; lacks adjustable timing and fault-detection capability | Choose TLV803EB29DBZR only for cost-sensitive, non-safety-critical applications requiring minimal feature set |
Compared with MAX6747KA29+T and TLV803EB29DBZR, the MAX6746KA29+T uniquely combines factory-trimmed precision, capacitor-adjustable dual-timing, and push-pull drive in an AEC-Q100 qualified package - making it optimal for automotive and industrial systems demanding both reliability and configurability.
Availability
MAX6746KA29+T is available at Aetrix Electronics and suitable for automotive body control modules, battery-powered medical monitors, industrial PLC I/O modules, and smart energy meter controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6746KA29+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 engineered specifically for robust microprocessor supervision in harsh environments, emphasizing precision reset thresholds, transient immunity, and AEC-Q100 compliance for automotive and industrial control applications.
FAQ
What is the exact reset threshold voltage of the MAX6746KA29+T?
The MAX6746KA29+T has a factory-trimmed VCC reset threshold of 2.925V with ±2% tolerance over -40°C to +125°C, corresponding to suffix "29" per Table 2 in the datasheet. This value is laser-trimmed during production and does not require external resistor calibration.
How do I calculate the capacitor value for a 10ms reset timeout on the MAX6746KA29+T?
Use the formula CSRT = tRP / 4.94 × 10⁶, where tRP is in seconds. For 10ms (0.01s), CSRT = 0.01 / 4.94 × 10⁶ = 2024pF. A standard 2000pF ceramic capacitor yields ~9.9ms timeout, well within the device's specified range and tolerance.
Does the MAX6746KA29+T support watchdog functionality, and how is it configured?
Yes, the MAX6746KA29+T includes a capacitor-adjustable watchdog timer. Connect a capacitor between SWT and GND to set normal-mode timeout (tWD = 4.94 × 10⁶ × CSWT). Tie WDS to GND for normal mode or to VCC for 128× extended mode. Watchdog is disabled by grounding SWT.
Can the MAX6746KA29+T operate with a 1.8V supply voltage?
Yes, the MAX6746KA29+T operates from 1.0V to 5.5V. At 1.8V, supply current is 4.2–9µA (typ/max), reset threshold remains 2.925V ±2%, and RESET output is guaranteed valid with ISINK = 50µA (VOL ≤ 0.3V). Full functionality is maintained across the entire voltage range.
Is the MAX6746KA29+T qualified for automotive applications?
Yes, the MAX6746KA29+T is AEC-Q100 qualified (Grade 0) and fully specified over -40°C to +125°C. It meets automotive reliability standards including transient immunity, extended temperature operation, and process control - making it suitable for body electronics, infotainment, and ADAS subsystems.
MAX6746KA29+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:
- Push-Pull, Totem Pole
- 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
MAX6746KA29+T FAQ
1.How can I place an order for MAX6746KA29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6746KA29+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 MAX6746KA29+T reliable?
The price and inventory of MAX6746KA29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6746KA29+T is usually 5 days.
3.What payment methods are accepted for MAX6746KA29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6746KA29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6746KA29+T?
MAX6746KA29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6746KA29+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 MAX6746KA29+T?
For technical support, including MAX6746KA29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6746KA29+T requirements.
6.How does Aetrix verify that MAX6746KA29+T is sourced from the original manufacturer or authorized distributors?
All MAX6746KA29+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 MAX6746KA29+T meets industry standards.
7.What is the process for return or replacement of MAX6746KA29+T?
All MAX6746KA29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6746KA29+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 MAX6746KA29+T part is unused and in its original packaging.
Return procedure for MAX6746KA29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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