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Analog Devices Inc./Maxim Integrated MAX6746KA16+T
- Part No.:
- MAX6746KA16+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6746KA16+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,246
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Product details
Overview
MAX6746KA16+T from Analog Devices is a low-power microprocessor supervisory circuit with factory-trimmed 1.575V ±2% VCC reset threshold, capacitor-adjustable reset timeout (5.7–9.5ms with 1500pF), 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 MAX6746KA16+T datasheet, MAX6746KA16+T pinout, MAX6746KA16+T application, or MAX6746KA16+T equivalent, this device supports single-supply voltage monitoring, transient-immune reset assertion down to VCC ≥ 1V, and configurable watchdog timing via external capacitor - key selection criteria for battery-powered controllers and embedded systems requiring AEC-Q100-compliant supervision.
Technical Context
The MAX6746KA16+T implements a precision bandgap-based reset comparator with ±2% threshold accuracy over -40°C to +125°C, guaranteed valid RESET output for VCC ≥ 1V, and immunity to power-supply transients up to 50µs at 100mV overdrive. Its reset timeout is set by an external capacitor on SRT (tRP = 4.94 × 10⁶ × CSRT), and its watchdog timeout is set by CSWT (tWD = 4.94 × 10⁶ × CSWT), extendable 128× via WDS pin.
It integrates a manual-reset input (MR) with internal 12–28kΩ pullup, 100ns glitch rejection, and 1µs minimum pulse width requirement. The push-pull RESET output drives low to ≤0.3V at 50µA and high to ≥0.8×VCC, ensuring robust interface with µP reset inputs without external pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.575V ±2% - factory-trimmed for precise brownout detection at low-voltage rails |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V - enables multi-year operation in battery-powered systems |
| Reset Timeout | 5.69–9.49ms with 1500pF - configurable via external capacitor to match µP reset timing requirements |
| Watchdog Timeout | 5.69–9.49ms (normal mode) or 729–1214ms (extended mode) - selectable via WDS pin for flexible firmware supervision |
| Operating Temp | -40°C to +125°C - fully specified for automotive under-hood and industrial control environments |
| RESET Output | Push-pull active-low - eliminates need for external pullup resistor and ensures fast, deterministic reset release |
| VCC Range | 1.0V to 5.5V - supports wide-input systems including 1.2V, 1.8V, 3.3V, and 5V logic domains |
Pinout & Package
MAX6746KA16+T is housed in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176), optimized for space-constrained automotive and portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual-Reset Input | Active-low input with internal 12–28kΩ pullup; asserts reset for tRP after 1µs low pulse; rejects 100ns glitches |
| 2 WDS | Watchdog Select Input | Ground = normal watchdog mode; VCC = extended (128×) mode; state change clears watchdog timer |
| 3 SWT | Watchdog Timeout Input | Capacitor-to-ground sets tWD; shorted to GND disables watchdog function |
| 4 SRT | Reset Timeout Input | Capacitor-to-ground sets tRP; determines duration of asserted RESET after fault clearance |
| 5 GND | Ground Reference | Primary return path for all internal circuits and external timing capacitors |
| 6 WDI | Watchdog Input | Falling-edge-triggered; must toggle within tWD to prevent reset; requires 100kΩ pulldown if unused |
| 7 RESET | Reset Output | Push-pull active-low; sinks ≤0.3V @ 50µA, sources ≥0.8×VCC @ 200µA; guaranteed valid for VCC ≥ 1V |
| 8 VCC | Supply Voltage Input | Power input and monitored rail; supports 1.0–5.5V; powers internal comparators and logic |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Trimmed Reset Threshold | 1.575V ±2% - eliminates external resistor divider and calibration effort for fixed-rail monitoring |
| Capacitor-Adjustable Reset Timeout | Configurable 0.5–9.5ms range - matches diverse µP power-up sequences without firmware changes |
| 128× Watchdog Extension | WDS pin toggles between normal and extended modes - accommodates both fast-boot and long-loop firmware |
| Transient-Immune Reset Logic | Rejects ≤50µs glitches at 100mV overdrive - prevents spurious resets in noisy automotive electrical environments |
| Guaranteed RESET Validity Down to 1V | Operates reliably during brownout recovery - ensures µP remains held in reset until supply stabilizes |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 1.8V microcontroller supply in engine ECU exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Supervises VCC and asserts push-pull RESET to hold µP in known state during voltage sags below 1.575V. Use Value: Prevents code corruption during cranking (VCC dip to 1.2V) with guaranteed reset validity down to 1.0V and 50µs transient immunity. | Use Scenario: Ensures fail-safe restart of ARM-based controller in battery-powered infusion pump with dual 3.3V/1.2V rails. IC Role / Device Role / Timing Role: Uses MR input for clinician-initiated reset and capacitor-tuned 7.6ms reset timeout to align with safety-critical boot sequence. Use Value: Enables deterministic, AEC-Q100-aligned supervision without external components - reducing BOM count and layout area in Class II medical design. |
| Industrial PLC I/O Module | Smart Energy Meter MCU |
Use Scenario: Provides watchdog supervision for Cortex-M4 in DIN-rail mounted PLC operating at -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Configures CSWT = 100pF for 0.51ms watchdog timeout and uses WDS to switch between debug (normal) and field (extended) modes. Use Value: Supports firmware development and deployment with one hardware variant - eliminating separate SKUs for test vs. production. | Use Scenario: Monitors 3.3V supply in revenue-grade meter subjected to utility grid surges and brownouts. IC Role / Device Role / Timing Role: Leverages ±2% threshold accuracy and hysteresis to avoid chatter during slow VCC recovery near 1.575V. Use Value: Meets IEC 62053-21 accuracy requirements for supply supervision in metrology-critical applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6747KA16+T | Same 1.575V reset threshold and specs, but open-drain RESET output instead of push-pull | Requires external pullup resistor; suitable when level-shifting to higher-voltage reset domain is needed | Select MAX6747KA16+T only if interfacing to non-1.8V/3.3V µP reset inputs or needing voltage translation |
| TPS3808G16DBVR | 1.6V reset threshold (±0.5%), 1.6µA quiescent current, fixed 200ms reset timeout, no adjustable watchdog | Lacks capacitor-adjustable timing and manual reset; optimized for ultra-low-power, fixed-timing applications | Choose TPS3808G16DBVR for simpler, lower-ICC supervision where timing flexibility and MR are not required |
Compared with MAX6747KA16+T and TPS3808G16DBVR, the MAX6746KA16+T uniquely combines factory-trimmed low-threshold supervision, push-pull drive, manual reset, and capacitor-adjustable reset/watchdog timing - making it optimal for automotive and industrial designs demanding configurability and AEC-Q100 compliance without external components.
Availability
MAX6746KA16+T is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pump controllers, industrial PLC I/O modules, and smart energy meter MCUs requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6746KA16+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 AEC-Q100-compliant microprocessor supervision in harsh environments, delivering precision reset thresholds, transient immunity, and flexible timing - targeting automotive ECUs, medical devices, and industrial controllers.
FAQ
What is the exact reset threshold voltage of MAX6746KA16+T?
The MAX6746KA16+T has a factory-trimmed VCC reset threshold of 1.575V with ±2% tolerance over -40°C to +125°C, as confirmed in the Electrical Characteristics table and Selector Guide. This value corresponds to suffix "16" in the ordering code and is verified across temperature and process corners - no external resistor divider is needed for this fixed-threshold configuration.
Does MAX6746KA16+T support dual-voltage monitoring?
No, MAX6746KA16+T does not support dual-voltage monitoring. It monitors only the VCC supply using its internal 1.575V threshold. Dual monitoring (e.g., VCC + external VMON_TH) is implemented only in MAX6750/MAX6751 variants. The MAX6746KA16+T lacks RESET IN pin functionality and is strictly a single-supply supervisor.
How do I configure the watchdog timeout for MAX6746KA16+T?
To configure the watchdog timeout for MAX6746KA16+T, connect a capacitor (CSWT) between pin 3 (SWT) and ground. The timeout is calculated as tWD = 4.94 × 10⁶ × CSWT seconds. For example, a 1500pF capacitor yields ~7.4ms in normal mode (WDS = GND) or ~949ms in extended mode (WDS = VCC). Shorting SWT to GND disables the watchdog.
Is MAX6746KA16+T AEC-Q100 qualified?
Yes, MAX6746KA16+T is AEC-Q100 qualified. The datasheet explicitly states "AEC-Q100 Qualified" in the Benefits and Features section and specifies full operation over -40°C to +125°C - meeting Grade 0 stress testing requirements. This qualification is inherent to the MAX6746–MAX6753 family and applies to all variants in the 8-pin SOT23 package.
What is the minimum VCC required for MAX6746KA16+T to assert a valid RESET signal?
The MAX6746KA16+T guarantees valid RESET output logic states for VCC ≥ 1.0V. Specifically, RESET remains asserted (low) with VOL ≤ 0.3V when sinking 50µA, and releases high with VOH ≥ 0.8 × VCC when sourcing 200µA. Below 1.0V, RESET behavior is not guaranteed - consistent with its design for brownout detection above 1V.
MAX6746KA16+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:
- 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
MAX6746KA16+T FAQ
1.How can I place an order for MAX6746KA16+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6746KA16+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 MAX6746KA16+T reliable?
The price and inventory of MAX6746KA16+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6746KA16+T is usually 5 days.
3.What payment methods are accepted for MAX6746KA16+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6746KA16+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6746KA16+T?
MAX6746KA16+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6746KA16+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 MAX6746KA16+T?
For technical support, including MAX6746KA16+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6746KA16+T requirements.
6.How does Aetrix verify that MAX6746KA16+T is sourced from the original manufacturer or authorized distributors?
All MAX6746KA16+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 MAX6746KA16+T meets industry standards.
7.What is the process for return or replacement of MAX6746KA16+T?
All MAX6746KA16+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6746KA16+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 MAX6746KA16+T part is unused and in its original packaging.
Return procedure for MAX6746KA16+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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