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Analog Devices Inc./Maxim Integrated MAX6746KA46+T
- Part No.:
- MAX6746KA46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6746KA46+T.pdf
- Description:
- IC MPU/RESET CIRC SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,180
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Product details
Overview
MAX6746KA46+T from Analog Devices is a low-power microprocessor supervisory circuit with factory-trimmed 4.625V ±2% VCC reset threshold, capacitor-adjustable reset timeout (5.7–9.5ms), and standard watchdog timer. It features push-pull active-low RESET output, manual-reset input (MR), and operates across -40°C to +125°C for automotive-grade reliability in critical μP monitoring applications.
For engineers reviewing the MAX6746KA46+T datasheet, MAX6746KA46+T pinout, MAX6746KA46+T application, or MAX6746KA46+T equivalent, this device supports single-supply voltage monitoring, transient-immune reset assertion down to VCC ≥ 1V, and configurable watchdog timeout via external capacitor - key selection criteria for embedded controllers and battery-powered systems requiring AEC-Q100-compliant supervision.
Technical Context
The MAX6746KA46+T implements dual-trigger reset logic: it asserts RESET when VCC falls below its factory-set 4.625V threshold or when MR is pulled low. Reset remains asserted for a capacitor-determined timeout period (tRP = 4.94 × 10⁶ × CSRT) after recovery, with guaranteed validity down to VCC = 1V.
It integrates a standard watchdog timer (not windowed) with normal-mode timeout adjustable via SWT capacitor (tWD = 4.94 × 10⁶ × CSWT), and includes WDS input to extend timeout by 128×. No SET0/SET1 pins are present - confirming it belongs to the MAX6746–MAX6751 variant group, not MAX6752/MAX6753.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.625V ±2% (factory-trimmed); ensures precise brownout detection at nominal 4.6V rail |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V; enables ultra-low-power operation in battery-backed systems |
| Reset Timeout Range | 5.7–9.5ms with CSRT = 100–1500pF; accommodates diverse µP power-up timing requirements |
| Watchdog Timeout Range | 5.7–9.5ms (normal mode) or 729–1214ms (extended mode) with CSWT = 100–1500pF |
| Operating Temp | -40°C to +125°C; fully specified for automotive under-hood and industrial control environments |
| RESET Output Type | Push-pull active-low; drives µP reset pin directly without external pullup resistor |
| VCC Range | 1.2V to 5.5V; supports supervision of 1.8V, 3.3V, and 5V logic rails |
Pinout & Package
MAX6746KA46+T is housed in an 8-pin SOT23 package (outline 21-0078), footprint-compatible with industry-standard land pattern 90-0176. Thermal resistance is 196°C/W (Junction-to-Ambient, four-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Manual Reset) | Active-low input; internally pulled up to VCC; 1µs minimum pulse width required to assert reset |
| 2 | WDI (Watchdog Input) | Falling-edge-triggered; clears watchdog timer; must not float (100kΩ pulldown recommended) |
| 3 | SWT (Watchdog Timeout) | Capacitor-connected node; sets basic watchdog timeout period (tWD = 4.94 × 10⁶ × CSWT) |
| 4 | SRT (Reset Timeout) | Capacitor-connected node; sets reset timeout period (tRP = 4.94 × 10⁶ × CSRT) |
| 5 | GND | Ground reference for all internal comparators and output drivers |
| 6 | WDS (Watchdog Select) | Logic input: GND = normal mode, VCC = extended mode (128× timeout multiplier) |
| 7 | RESET | Push-pull active-low output; sinks 50µA @ 0.3V max VOL; valid for VCC ≥ 1V |
| 8 | VCC | Power supply input; monitored for 4.625V reset threshold; also powers internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 4.625V ±2% eliminates need for external resistor divider calibration |
| Capacitor-adjustable reset timeout | Enables precise matching to µP power-up sequence without firmware changes |
| 128× watchdog timeout extension | WDS pin allows one hardware configuration to support both fast and slow watchdog intervals |
| Power-supply transient immunity | Rejects 50µs transients ≤100mV below VTH - reduces false resets in noisy automotive environments |
| AEC-Q100 qualified | Validated for automotive applications per stress test requirements (Grade 0: -40°C to +125°C) |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 5V system rail in engine management ECU exposed to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Supervises VCC and provides reset pulse during brownout; extends watchdog timeout during diagnostic routines via WDS. Use Value: Prevents erratic code execution during voltage sags; 128× timeout extension avoids unnecessary resets during extended self-test sequences. | Use Scenario: Ensures safe restart of microcontroller after battery swap or low-voltage condition in portable infusion pump. IC Role / Device Role / Timing Role: Detects VCC drop below 4.625V and asserts RESET for 7.6ms (CSRT = 1000pF); MR pin enables clinician-initiated reset. Use Value: Guarantees deterministic µP initialization before motor activation; push-pull RESET eliminates external pullup, saving PCB area and BOM cost. |
| Industrial PLC I/O Module | Smart Energy Meter MCU |
Use Scenario: Provides fail-safe reset for ARM-based controller in DIN-rail mounted PLC subjected to wide ambient temperature swings. IC Role / Device Role / Timing Role: Monitors 3.3V supply; uses CSRT = 1500pF to set 9.5ms reset hold time; leverages -40°C to +125°C rating for uncooled enclosures. Use Value: Maintains reliable reset assertion across full industrial temperature range; low 3.7µA ICC minimizes self-heating and extends battery backup runtime. | Use Scenario: Supervises 5V auxiliary rail powering metrology and communication subsystems in AMI meter. IC Role / Device Role / Timing Role: Uses WDI to monitor firmware heartbeat; asserts RESET if no falling edge occurs within tWD (CSWT = 1000pF → 7.6ms normal mode). Use Value: Detects firmware lockup without adding software overhead; open-drain alternative not used - push-pull simplifies interface to isolated reset domain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6747KA46+T | Same 4.625V reset threshold and timing specs, but features open-drain RESET output instead of push-pull | Required where level-shifting or wired-OR reset bus is needed; incompatible with direct µP reset pin drive without pullup | Select MAX6747KA46+T only when open-drain functionality is explicitly required for system-level reset arbitration |
| TPS3808G33DBVR | Fixed 3.3V reset threshold (not 4.625V); 3.5µA ICC; no manual reset or watchdog select input; different pinout | Only suitable for 3.3V-only systems lacking watchdog extension or MR capability; requires PCB redesign | Choose TPS3808G33DBVR only for cost-sensitive 3.3V applications without watchdog flexibility or manual reset needs |
Compared with MAX6747KA46+T, MAX6746KA46+T offers direct µP reset drive without external components; versus TPS3808G33DBVR, it delivers higher threshold accuracy, dual-trigger reset, and field-configurable watchdog - critical for automotive and industrial designs demanding robust fault coverage.
Availability
MAX6746KA46+T is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pumps, industrial PLC modules, and smart energy meters requiring stable component supply with AEC-Q100 qualification and extended temperature support.
Supply support for MAX6746KA46+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.
The MAX6746–MAX6753 family was designed specifically for automotive and industrial microprocessor supervision, emphasizing low quiescent current, transient immunity, and flexible reset/watchdog configurability across extreme temperatures.
FAQ
What is the exact factory-trimmed reset threshold voltage for MAX6746KA46+T?
The MAX6746KA46+T has a factory-trimmed VCC reset threshold of 4.625V with ±2% tolerance over -40°C to +125°C, as confirmed by Table 2 (suffix "46") in the official datasheet. This value is laser-trimmed during production and does not require external resistor calibration.
Does MAX6746KA46+T support dual-voltage monitoring?
No, MAX6746KA46+T does not support dual-voltage monitoring. It monitors only the VCC supply using its fixed 4.625V threshold. Dual monitoring (VCC + external RESET IN) is available only on MAX6750/MAX6751 variants - MAX6746KA46+T lacks the RESET IN pin and associated comparator circuitry.
Can MAX6746KA46+T be used with a 1.8V microcontroller supply?
Yes, MAX6746KA46+T operates with VCC as low as 1.2V and guarantees valid RESET output down to VCC ≥ 1V. However, its 4.625V reset threshold means it is intended for supervision of 5V rails - for 1.8V µP supervision, a different suffix (e.g., "18") or adjustable-threshold variant like MAX6748 would be required.
What is the function of the WDS pin on MAX6746KA46+T?
The WDS pin on MAX6746KA46+T selects watchdog timeout mode: grounded for normal mode (tWD = 4.94 × 10⁶ × CSWT), or tied to VCC to enable extended mode (tWD × 128). A state change on WDS clears the watchdog timer, ensuring deterministic behavior during mode transitions.
Is MAX6746KA46+T RoHS compliant and lead-free?
Yes, MAX6746KA46+T is RoHS compliant and lead-free. The "+T" suffix in the part number indicates tape-and-reel packaging with RoHS-compliant finish, consistent with Analog Devices' standard environmental compliance for automotive-grade products.
MAX6746KA46+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:
- 4.625V
- 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
MAX6746KA46+T FAQ
1.How can I place an order for MAX6746KA46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6746KA46+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 MAX6746KA46+T reliable?
The price and inventory of MAX6746KA46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6746KA46+T is usually 5 days.
3.What payment methods are accepted for MAX6746KA46+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6746KA46+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6746KA46+T?
MAX6746KA46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6746KA46+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 MAX6746KA46+T?
For technical support, including MAX6746KA46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6746KA46+T requirements.
6.How does Aetrix verify that MAX6746KA46+T is sourced from the original manufacturer or authorized distributors?
All MAX6746KA46+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 MAX6746KA46+T meets industry standards.
7.What is the process for return or replacement of MAX6746KA46+T?
All MAX6746KA46+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6746KA46+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 MAX6746KA46+T part is unused and in its original packaging.
Return procedure for MAX6746KA46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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