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Analog Devices Inc./Maxim Integrated MAX6746KA17/V+T
- Part No.:
- MAX6746KA17/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6746KA17/V+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,663
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Product details
Overview
MAX6746KA17/V+T from Analog Devices is a low-power microprocessor supervisory circuit with factory-trimmed 1.665V ±2% VCC reset threshold, capacitor-adjustable 5.7–9.5ms reset timeout, and standard watchdog timer. It monitors single supply voltage (1.2V–5.5V), asserts active-low push-pull RESET on VCC brownout or manual reset, and operates across -40°C to +125°C for automotive-grade embedded controllers.
For engineers reviewing the MAX6746KA17/V+T datasheet, MAX6746KA17/V+T pinout, MAX6746KA17/V+T application, or MAX6746KA17/V+T equivalent, this device delivers AEC-Q100-qualified power-on reset, transient-immune supervision, and configurable watchdog timing - critical for battery-powered medical instruments, automotive ECUs, and industrial microcontroller systems requiring guaranteed reset validity down to VCC ≥ 1V.
Technical Context
The MAX6746KA17/V+T implements a precision bandgap-based VCC monitor with ±2% threshold accuracy over -40°C to +125°C and 0.8% hysteresis. Its reset assertion logic combines VCC undervoltage detection, manual-reset input (MR) with 1µs minimum pulse width and 100ns glitch rejection, and a capacitor-programmable reset timeout (tRP = 4.94 × 10⁶ × CSRT).
This variant lacks adjustable RESET IN monitoring and windowed watchdog functionality - it features only the standard watchdog timer with normal/extended mode selection via WDS, and uses a push-pull RESET output with VOL ≤ 0.3V at ISINK = 50µA and VOH ≥ 0.8×VCC at ISOURCE = 200µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.665V ±2% (factory-trimmed); ensures reliable power-on reset initiation at precise VCC level |
| Supply Voltage Range | 1.2V to 5.5V; supports operation across wide battery and rail voltages including 1.8V, 3.3V, and 5V systems |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V; enables ultra-low-power supervision in always-on battery applications |
| Reset Timeout Period | 5.7–9.5ms (CSRT = 1500pF); programmable via external capacitor to match µP reset hold-time requirements |
| Watchdog Timeout | 5.7–9.5ms normal mode / 729–1214ms extended mode (CSWT = 1500pF); selectable via WDS pin for flexible firmware watchdog servicing |
| Operating Temperature | -40°C to +125°C; fully specified for under-hood automotive and industrial environments |
| RESET Output Type | Push-pull active-low; eliminates need for external pull-up resistor and simplifies interface to µP reset inputs |
Pinout & Package
MAX6746KA17/V+T is housed in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176), RoHS-compliant, with 1.9mm × 2.8mm footprint and 0.95mm height - optimized for space-constrained PCB layouts in portable and automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Manual Reset) | Active-low input; internally pulled up to VCC; initiates reset when held low ≥1µs; no external components required |
| 2 | WDS (Watchdog Select) | Selects watchdog mode: GND = normal timeout, VCC = extended (128×) timeout; state change clears watchdog timer |
| 3 | SWT (Watchdog Timeout) | Capacitor connection point; sets watchdog period per tWD = 4.94×10⁶×CSWT (seconds/Farads) |
| 4 | SRT (Reset Timeout) | Capacitor connection point; sets reset hold time per tRP = 4.94×10⁶×CSRT (seconds/Farads) |
| 5 | GND | Ground reference for all internal circuits and external capacitors |
| 6 | WDI (Watchdog Input) | Falling-edge-triggered watchdog feed; must be strobed within timeout window to prevent reset assertion |
| 7 | RESET | Push-pull active-low output; drives µP reset pin directly; valid for VCC ≥ 1V; VOL ≤ 0.3V, VOH ≥ 0.8×VCC |
| 8 | VCC | Power supply input and monitored voltage rail; supports 1.2V–5.5V operation with guaranteed reset behavior |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Qualified for automotive applications per Grade 0 (-40°C to +125°C junction temperature) |
| Power-supply transient immunity | Rejects VCC glitches ≤50µs duration when falling 100mV below threshold - prevents spurious resets in noisy environments |
| Guaranteed RESET validity down to VCC = 1V | Ensures deterministic reset signaling during brownout recovery without external level-shifting circuitry |
| Capacitor-adjustable timing | Independent tuning of reset hold time (SRT) and watchdog timeout (SWT) using low-leakage ceramic capacitors |
| Internal MR pullup | 20kΩ typical pullup eliminates need for external resistor - simplifies manual reset switch interface |
Applications
| Automotive Engine Control Unit (ECU) | Portable Medical Glucose Monitor |
|---|---|
Use Scenario: Monitors 3.3V main supply and provides fail-safe reset during cold cranking or load dump events. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to ARM Cortex-M4 MCU upon VCC drop below 1.665V. Use Value: Prevents code execution errors during voltage transients; 125°C rating ensures reliability in under-hood placement. |
Use Scenario: Powers on/off sequence control and firmware watchdog supervision in disposable handheld diagnostic device. IC Role / Device Role / Timing Role: Single-supply supervisor with 3.7µA ICC enabling >2-year battery life; MR pin enables user-initiated calibration reset. Use Value: Eliminates external reset IC and pull-up components; push-pull output reduces BOM count and layout area. |
| Industrial PLC I/O Module | Smart Energy Meter MCU Subsystem |
Use Scenario: Ensures deterministic boot of real-time Linux processor after AC power interruption or brownout. IC Role / Device Role / Timing Role: Resets TI Sitara AM335x SoC via push-pull RESET; capacitor-tuned 7.6ms tRP matches bootloader requirements. Use Value: Factory-trimmed 1.665V threshold avoids calibration; -40°C to +125°C range supports uncooled cabinet mounting. |
Use Scenario: Supervises metrology SoC (e.g., STPM32) during power cycling caused by grid instability or tamper detection. IC Role / Device Role / Timing Role: Dual-function supervisor: VCC monitoring + software watchdog with WDS-selectable timeout scaling. Use Value: Extended watchdog mode (128×) allows infrequent firmware servicing while maintaining safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6747KA17/V+T | Replaces MR pin with open-drain RESET output; same VTH, timing, and temperature specs | Required where system-level reset bus uses wired-OR configuration or level-shifting to higher-voltage logic | Select MAX6747KA17/V+T only if open-drain drive and external pull-up are needed; otherwise MAX6746KA17/V+T offers simpler direct-drive interface |
| TPS3808G17DBVR | TI part with 1.7V ±0.5% threshold, fixed 200ms reset timeout, and no watchdog; 1.8V–6.5V VCC range | Suitable for basic power-on reset only; lacks capacitor-adjustable timing and watchdog capability | Choose TPS3808G17DBVR for cost-sensitive, non-watchdog applications needing tighter threshold tolerance; MAX6746KA17/V+T preferred when programmable timing or watchdog is required |
Compared with MAX6747KA17/V+T and TPS3808G17DBVR, MAX6746KA17/V+T uniquely combines factory-trimmed 1.665V reset, push-pull output, and dual capacitor-adjustable timing - making it optimal for automotive and portable designs demanding both precision reset and flexible firmware supervision without layout or BOM overhead.
Availability
MAX6746KA17/V+T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical diagnostics, industrial PLC I/O modules, and smart energy metering systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6746KA17/V+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 - delivering AEC-Q100-qualified reset, watchdog, and voltage monitoring functions in miniature SOT23 packages.
FAQ
What is the exact reset threshold voltage of MAX6746KA17/V+T?
The MAX6746KA17/V+T has a factory-trimmed VCC reset threshold of 1.665V with ±2% tolerance over -40°C to +125°C, corresponding to suffix "17" per Table 2 in the datasheet. This value is laser-trimmed during production and does not require external resistor networks - unlike variants with adjustable RESET IN inputs.
Does MAX6746KA17/V+T support dual-voltage monitoring?
No, MAX6746KA17/V+T monitors only the VCC supply voltage. It does not include the adjustable RESET IN input found in MAX6748–MAX6751 or dual-threshold capability of MAX6750/MAX6751. Its function is strictly single-rail supervision with factory-set 1.665V threshold.
Can MAX6746KA17/V+T be used in systems with VCC < 1.2V?
No - the absolute minimum operating VCC for MAX6746KA17/V+T is 1.2V (per Electrical Characteristics table). Below this, the internal bandgap reference and comparators cannot guarantee proper reset assertion or timing behavior. For sub-1.2V applications, consider alternative supervisors with lower VCC minima.
How is the watchdog timeout extended in MAX6746KA17/V+T?
In MAX6746KA17/V+T, the watchdog timeout is extended 128× by pulling the WDS pin high (to VCC). When WDS = GND, the device operates in normal mode with tWD = 4.94×10⁶×CSWT. A state change on WDS clears the watchdog timer, ensuring deterministic restart after mode switching.
Is MAX6746KA17/V+T pin-compatible with other MAX6746 variants?
Yes - all MAX6746 variants (including MAX6746KA17/V+T) share identical 8-pin SOT23 pinout and package dimensions. Differences are limited to reset threshold voltage (suffix), RESET output type (push-pull vs. open-drain), and presence/absence of MR or RESET IN pins - all electrically compatible within the same package footprint.
MAX6746KA17/V+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:
- 1.665V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6746KA17/V+T FAQ
1.How can I place an order for MAX6746KA17/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6746KA17/V+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 MAX6746KA17/V+T reliable?
The price and inventory of MAX6746KA17/V+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6746KA17/V+T is usually 5 days.
3.What payment methods are accepted for MAX6746KA17/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6746KA17/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6746KA17/V+T?
MAX6746KA17/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6746KA17/V+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 MAX6746KA17/V+T?
For technical support, including MAX6746KA17/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6746KA17/V+T requirements.
6.How does Aetrix verify that MAX6746KA17/V+T is sourced from the original manufacturer or authorized distributors?
All MAX6746KA17/V+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 MAX6746KA17/V+T meets industry standards.
7.What is the process for return or replacement of MAX6746KA17/V+T?
All MAX6746KA17/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6746KA17/V+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 MAX6746KA17/V+T part is unused and in its original packaging.
Return procedure for MAX6746KA17/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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