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Analog Devices Inc./Maxim Integrated MAX6751KA31+T
- Part No.:
- MAX6751KA31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6751KA31+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:6,222
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Product details
Overview
The MAX6751KA31+T from Analog Devices is a low-power microprocessor supervisory circuit with dual-voltage monitoring (VCC and RESET IN), factory-trimmed 3.075V ±2% reset threshold, capacitor-adjustable 7.6ms reset timeout (CSRT = 1500pF), and extended-mode watchdog timeout (971.5ms at CSWT = 1500pF). It features open-drain active-low RESET output, manual-reset input (MR), and AEC-Q100 qualification for automotive use.
For engineers reviewing the MAX6751KA31+T datasheet, MAX6751KA31+T pinout, MAX6751KA31+T application, or MAX6751KA31+T equivalent, this device supports critical μP reset supervision in battery-powered controllers, intelligent instruments, and automotive ECUs where precise voltage thresholds, transient immunity, and configurable watchdog timing are required.
Technical Context
The MAX6751KA31+T implements dual-supply monitoring: VCC is compared against a factory-trimmed 3.075V threshold (±2% over −40°C to +125°C), while RESET IN monitors an externally adjustable voltage via resistor divider (1.235V reference). Its reset assertion is immune to transients ≤50µs when VCC dips 100mV below threshold.
Watchdog operation uses WDS pin selection: grounded for normal mode (tWD = 7.59ms), VCC-connected for extended mode (tWD ×128 = 971.5ms). Reset timeout (tRP) and watchdog timeout (tWD) are independently set by external capacitors CSRT and CSWT using t = 4.94×10⁶ × C (seconds/Farads).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.075V ±2% (factory-trimmed, −40°C to +125°C); ensures reliable brownout detection at nominal 3.3V systems |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V; enables multi-year battery life in portable equipment |
| Reset Timeout | 7.59ms typical (CSRT = 1500pF); meets μP power-on reset timing requirements for ARM Cortex-M and similar cores |
| Watchdog Timeout | 971.5ms typical in extended mode (CSWT = 1500pF); provides long software service intervals without sacrificing fault coverage |
| Operating Temp | −40°C to +125°C; fully specified for under-hood automotive applications per AEC-Q100 Grade 0 |
| RESET Output | Open-drain active-low; supports level-shifting to 0–6V logic domains and wired-OR reset bus configurations |
| VCC Range | 1.2V to 5.5V; compatible with 1.8V, 2.5V, 3.3V, and 5V system rails |
Pinout & Package
Package: 8-pin SOT23 (Outline 21-0078, RoHS-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Manual-Reset Input | Active-low input with 12–28kΩ internal pullup; asserts reset for full timeout period when pulled low ≥1µs |
| 2 - WDS | Watchdog Select | Logic input: GND = normal watchdog mode, VCC = extended (×128) mode; state change clears watchdog timer |
| 3 - SWT | Watchdog Timeout Input | Capacitor connection point (to GND) setting tWD; connect to GND to disable watchdog |
| 4 - SRT | Reset Timeout Input | Capacitor connection point (to GND) setting tRP; determines duration of RESET assertion after fault clearance |
| 5 - GND | Ground Reference | Primary return path for all analog and digital functions; must be low-impedance for transient immunity |
| 6 - WDI | Watchdog Input | Falling-edge-triggered input; requires transition within tWD window or reset pulses; must not float (100kΩ pulldown recommended) |
| 7 - RESET | Reset Output | Open-drain active-low output; sinks ≥50µA at VOL ≤0.3V (VCC ≥1.0V); supports external pullup to any voltage ≤6V |
| 8 - VCC | Supply Voltage | Power input and VCC monitor rail; valid RESET guaranteed down to VCC = 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Voltage Monitoring | Simultaneously supervises fixed VCC (3.075V) and adjustable RESET IN (1.235V reference), enabling independent monitoring of core and I/O rails |
| Capacitor-Adjustable Timing | Independent reset (SRT) and watchdog (SWT) timeouts set via external capacitors-no trimming resistors or firmware needed |
| Extended Watchdog Mode | WDS pin extends watchdog timeout by 128×, allowing single capacitor value to cover both short-interval diagnostics and long background tasks |
| Transient Immunity | Guaranteed no false reset for VCC glitches ≤50µs at 100mV overdrive, eliminating need for external RC filtering in most automotive environments |
| AEC-Q100 Qualified | Qualified to Grade 0 (−40°C to +125°C), supporting deployment in engine control, ADAS, and body electronics without derating |
Applications
| Automotive Engine Control Unit (ECU) | Portable Medical Monitor |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply and 1.2V sensor bias rail in under-hood ECU exposed to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting RESET during VCC brownout or RESET IN undervoltage; extended watchdog guards against firmware lockup during CAN message processing. Use Value: Prevents erratic ECU behavior during 12V battery sag to 6V; 971ms watchdog timeout accommodates longest CAN frame transmission plus safety margin. | Use Scenario: Powers a handheld pulse oximeter with coin-cell battery and low-power ARM Cortex-M0+ MCU requiring deterministic reset on battery depletion. IC Role / Device Role / Timing Role: Primary reset supervisor with 3.075V VCC threshold and 7.6ms reset timeout; MR pin enables user-initiated recalibration reset. Use Value: 3.7µA quiescent current extends battery life beyond 2 years; open-drain RESET interfaces directly to MCU's 1.8V reset pin via 10kΩ pullup. |
| Industrial Smart Sensor Node | Set-Top Box Power Management |
Use Scenario: Supervises 2.5V MCU and 3.3V wireless transceiver in a battery-backed industrial temperature sensor deployed in unconditioned enclosures. IC Role / Device Role / Timing Role: Dual-monitoring IC asserting RESET if either rail drops below specification; capacitor-adjustable watchdog ensures firmware responsiveness during OTA updates. Use Value: −40°C to +125°C operation covers ambient extremes; 128× extended watchdog allows 1-second service interval without capacitor value change. | Use Scenario: Ensures clean power-up sequencing and runtime fault recovery in a 5V/3.3V/1.2V triple-rail STB SoC platform with HDMI and USB peripherals. IC Role / Device Role / Timing Role: VCC supervisor for main 3.3V domain; RESET IN monitors 1.2V core rail via resistor divider; open-drain output wired-OR'd with other supervisors. Use Value: Factory-trimmed 3.075V threshold eliminates calibration; 1.235V RESET IN reference enables accurate 1.2V rail monitoring with <1% error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6750KA31+T | Same 3.075V VCC threshold and dual-monitoring architecture, but push-pull RESET output instead of open-drain | Suitable where active-drive high-state RESET is required (e.g., driving TTL inputs directly), not for wired-OR buses | Select MAX6750KA31+T only if push-pull drive is mandatory; otherwise MAX6751KA31+T offers greater interface flexibility |
| TPS3808G33DBVR | 3.3V fixed threshold (±0.5%), 350ms fixed watchdog, no manual reset, 1.4µA supply current, SOT23-6 package | Better for ultra-low-power, single-rail applications without watchdog extension or manual reset needs | Choose TPS3808G33DBVR for cost-sensitive, low-complexity designs; MAX6751KA31+T preferred when dual-rail, extended watchdog, or MR are required |
Compared with MAX6750KA31+T and TPS3808G33DBVR, the MAX6751KA31+T uniquely combines open-drain RESET, dual-voltage monitoring, 128× extendable watchdog, and manual reset in a single AEC-Q100-qualified SOT23 package-making it optimal for automotive and industrial systems demanding configurability and robustness.
Availability
MAX6751KA31+T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical monitors, industrial smart sensor nodes, and set-top box power management requiring stable component supply across extended temperature ranges.
Supply support for MAX6751KA31+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 product line delivers highly configurable, low-power microprocessor supervisors optimized for automotive-grade reliability, dual-rail monitoring, and capacitor-tunable timing-targeting safety-critical embedded systems where deterministic reset behavior is non-negotiable.
FAQ
What is the factory-trimmed reset threshold voltage of the MAX6751KA31+T?
The MAX6751KA31+T has a factory-trimmed VCC reset threshold of 3.075V ±2% over the full automotive temperature range (−40°C to +125°C), as confirmed by the "31" suffix in its part number and Table 2 of the datasheet. This threshold is laser-trimmed during production and does not require external resistor networks for VCC supervision.
How do I configure the watchdog timeout period for the MAX6751KA31+T?
To configure the watchdog timeout for the MAX6751KA31+T, connect a capacitor (CSWT) between pin 3 (SWT) and GND. In normal mode (WDS = GND), tWD = 4.94×10⁶ × CSWT seconds; in extended mode (WDS = VCC), tWD = 128 × that value. For example, a 1500pF capacitor yields 7.59ms (normal) or 971.5ms (extended).
Does the MAX6751KA31+T support monitoring two different supply voltages simultaneously?
Yes, the MAX6751KA31+T supports dual-voltage monitoring: it compares VCC against its factory-trimmed 3.075V threshold while simultaneously monitoring an external voltage on pin 1 (RESET IN) using a 1.235V internal reference and an external resistor divider-enabling independent supervision of, for example, a 3.3V I/O rail and a 1.2V core rail.
What is the function of the MR pin on the MAX6751KA31+T?
The MR (Manual Reset) pin on the MAX6751KA31+T is an active-low input with internal 12–28kΩ pullup to VCC. Pulling MR low for ≥1µs asserts RESET for the full timeout period (e.g., 7.6ms), enabling hardware-initiated resets for field recalibration, user recovery, or external fault signaling-without requiring external components.
Is the MAX6751KA31+T qualified for automotive applications?
Yes, the MAX6751KA31+T is AEC-Q100 qualified (Grade 0) and fully specified over −40°C to +125°C. It includes automotive-specific features such as guaranteed RESET validity down to VCC = 1.0V, transient immunity up to 50µs at 100mV overdrive, and robust construction for under-hood environments-making it suitable for engine control, body electronics, and ADAS modules.
MAX6751KA31+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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 3.075V, Adj
- 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
MAX6751KA31+T FAQ
1.How can I place an order for MAX6751KA31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6751KA31+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 MAX6751KA31+T reliable?
The price and inventory of MAX6751KA31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6751KA31+T is usually 5 days.
3.What payment methods are accepted for MAX6751KA31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6751KA31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6751KA31+T?
MAX6751KA31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6751KA31+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 MAX6751KA31+T?
For technical support, including MAX6751KA31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6751KA31+T requirements.
6.How does Aetrix verify that MAX6751KA31+T is sourced from the original manufacturer or authorized distributors?
All MAX6751KA31+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 MAX6751KA31+T meets industry standards.
7.What is the process for return or replacement of MAX6751KA31+T?
All MAX6751KA31+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6751KA31+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 MAX6751KA31+T part is unused and in its original packaging.
Return procedure for MAX6751KA31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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