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Analog Devices Inc./Maxim Integrated MAX6751KA17+T
- Part No.:
- MAX6751KA17+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6751KA17+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,030
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Product details
Overview
MAX6751KA17+T from Analog Devices is a low-power microprocessor supervisory IC with dual-voltage monitoring (VCC and RESET IN), factory-trimmed 1.665V ±2% VCC reset threshold, adjustable reset timeout via external capacitor (CSRT), and extended-mode watchdog timer (128× normal timeout). It features open-drain active-low RESET output and operates across the automotive temperature range (−40°C to +125°C) for critical power-up/brownout protection in embedded controllers.
For engineers reviewing the MAX6751KA17+T datasheet, MAX6751KA17+T pinout, MAX6751KA17+T application, or MAX6751KA17+T equivalent, this page delivers verified specifications, validated pin functions, confirmed dual-supply monitoring capability, AEC-Q100 qualification status, and real-world timing behavior under transient conditions - all essential for automotive and battery-powered system design.
Technical Context
The MAX6751KA17+T implements dual-voltage supervision: a factory-trimmed 1.665V ±2% threshold monitors VCC, while an adjustable comparator on RESET IN (1.235V ±0.8% threshold) enables external resistor-divider-based monitoring of a second supply. Its watchdog timer supports normal and extended modes (128× scaling) via WDS pin control, with timeout periods set by CSWT capacitor values.
Reset assertion is guaranteed for VCC ≥ 1.0V; RESET remains valid during brownout down to 1V, and the device rejects transients ≤50µs when VCC dips 100mV below threshold. Supply current is 3.7µA typical at VCC = 2.0V, enabling ultra-low-power operation in portable and battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VCC) | 1.665V ±2% - factory-trimmed precision reference enabling reliable power-on reset at 1.6V–1.7V rails without external components |
| RESET IN Threshold | 1.235V ±0.8% - high-accuracy adjustable input for monitoring secondary supply via resistor divider |
| Supply Current | 3.7µA typical at VCC = 2.0V - minimizes quiescent drain in always-on battery applications |
| Reset Timeout Range | 0.506ms to 9.487ms - set by 100pF–1500pF capacitor on SRT pin, covering µP initialization delays from fast MCUs to legacy processors |
| Watchdog Timeout (Extended) | 64.77ms to 1214.4ms - 128× scaling enables long software service intervals (e.g., >1s with 10nF CSWT) without firmware overhead |
| Operating Temperature | −40°C to +125°C - fully specified for under-hood automotive and industrial environments |
| RESET Output Type | Open-drain active-low - supports level-shifting to 0–6V logic domains and wired-OR reset bus configurations |
Pinout & Package
MAX6751KA17+T is housed in an 8-pin SOT23 package (Outline 21-0078, RoHS-compliant), optimized for space-constrained PCB layouts in automotive and portable equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | Adjustable reset comparator input | Accepts external voltage divider to monitor secondary supply; threshold fixed at 1.235V ±0.8% |
| 2 - GND | Ground reference | Common return path for all internal circuits and external timing capacitors (SRT, SWT) |
| 3 - SWT | Watchdog timeout capacitor connection | Capacitor to GND sets base watchdog period; WDS pin selects ×1 or ×128 scaling |
| 4 - SRT | Reset timeout capacitor connection | Capacitor to GND sets reset pulse duration (tRP = 4.94×10⁶ × CSRT) |
| 5 - WDS | Watchdog mode select | Pull to GND for normal mode; pull to VCC for 128× extended timeout - state change clears watchdog timer |
| 6 - WDI | Watchdog input | Falling edge resets watchdog timer; must not float - 100kΩ pulldown recommended if unused |
| 7 - RESET | Open-drain reset output | Active-low signal asserted during VCC/RESET IN undervoltage or watchdog fault; requires external pullup |
| 8 - VCC | Power supply input | Operates from 1.2V to 5.5V; powers internal circuitry and serves as monitored rail (1.665V threshold) |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneously monitors VCC (1.665V ±2%) and external supply via RESET IN (1.235V ±0.8%), eliminating need for two discrete supervisors |
| Transient-immune reset | Rejects VCC glitches ≤50µs at 100mV overdrive - prevents spurious resets in noisy automotive electrical systems |
| Extended watchdog mode | WDS-controlled 128× timeout scaling enables single capacitor to cover both short (ms) and long (seconds) service intervals |
| AEC-Q100 qualified | Qualified for automotive applications per AEC-Q100 Rev H - ensures reliability in harsh thermal and vibration environments |
| Low-VCC reset validity | Guaranteed RESET functionality down to VCC = 1.0V - maintains deterministic behavior during deep brownout conditions |
Applications
| Automotive Body Control Module | Medical Infusion Pump |
|---|---|
Use Scenario: Monitors 1.8V MCU core supply and 3.3V sensor interface rail in a CAN-connected body controller exposed to load-dump transients. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting RESET during VCC brownout or RESET IN undervoltage, with extended watchdog guarding against firmware lockup during ECU sleep/wake transitions. Use Value: Prevents erratic actuator behavior by ensuring MCU restarts only after both supplies stabilize, and detects missed watchdog pulses caused by CAN bus interference. |
Use Scenario: Ensures safe power-up and runtime integrity of a battery-powered infusion pump MCU operating from a 3.6V Li-ion cell with aging voltage sag. IC Role / Device Role / Timing Role: Supervises main 3.6V rail (via VCC pin) and backup 1.2V RTC supply (via RESET IN), using capacitor-adjustable reset timeout to accommodate slow analog subsystem wake-up. Use Value: Guarantees pump motor halts immediately on undervoltage, and extended watchdog prevents uncontrolled fluid delivery due to software hang during dose calculation. |
| Industrial PLC I/O Module | Portable Test Equipment |
Use Scenario: Protects ARM Cortex-M7-based I/O module in factory automation, where 24V field power fluctuations cause 5V/3.3V supply ripple. IC Role / Device Role / Timing Role: Uses open-drain RESET to drive shared reset bus across multiple ASICs; RESET IN monitors isolated 3.3V auxiliary supply powering communication PHY. Use Value: Enables synchronized recovery of entire I/O stack after brownout, while independent monitoring of auxiliary supply prevents communication failure during primary rail recovery. |
Use Scenario: Powers up and safeguards a handheld oscilloscope's FPGA and ADC subsystems from Li-Po battery discharge below 3.0V. IC Role / Device Role / Timing Role: Factory-trimmed 1.665V VCC threshold triggers reset before FPGA configuration fails; adjustable watchdog timeout matches FPGA bitstream reload time. Use Value: Eliminates corrupted measurements by forcing full reinitialization before analog front-end calibration completes, ensuring measurement traceability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6750KA17+T | Same dual-monitoring architecture and 1.665V VCC threshold, but features push-pull RESET output instead of open-drain | Suitable where no external pullup is desired or where RESET must actively drive high during deassertion | Select MAX6750KA17+T when driving CMOS inputs directly without level-shifting or wired-OR buses |
| TPS3808G125DBVR | Single-supply supervisor (1.25V fixed threshold), no RESET IN input, no extended watchdog mode, 1.8µA typical ICC | Limited to single-rail monitoring; lacks dual-voltage capability and 128× watchdog scaling | Choose TPS3808G125DBVR only for cost-sensitive, single-rail applications where extended watchdog and secondary supply monitoring are unnecessary |
Compared with MAX6751KA17+T, MAX6750KA17+T offers identical supervision accuracy and timing but eliminates external pullup requirements, while TPS3808G125DBVR reduces quiescent current by 50% at the expense of dual-monitoring flexibility and watchdog configurability - making MAX6751KA17+T optimal for multi-rail automotive and medical systems requiring robust fault detection.
Availability
MAX6751KA17+T is available at Aetrix Electronics and suitable for automotive body control modules, medical infusion pumps, industrial PLC I/O modules, and portable test equipment requiring stable component supply with AEC-Q100 assurance and extended watchdog coverage.
Supply support for MAX6751KA17+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 automotive, industrial, communications, and healthcare markets.
The MAX6746–MAX6753 family was designed specifically for automotive-grade microprocessor supervision, delivering precision reset thresholds, transient immunity, and flexible watchdog architectures to ensure deterministic system startup and runtime reliability.
FAQ
What is the exact reset threshold voltage for MAX6751KA17+T?
The MAX6751KA17+T has a factory-trimmed VCC reset threshold of 1.665V ±2% (1.632V to 1.698V) over −40°C to +125°C. Its RESET IN input uses a separate 1.235V ±0.8% threshold for adjustable external supply monitoring. These values are specified in the Electrical Characteristics table and confirmed in Table 2 (suffix "17") of the datasheet.
Does MAX6751KA17+T support dual-voltage monitoring, and how is it implemented?
Yes, MAX6751KA17+T supports dual-voltage monitoring: VCC is monitored by its internal 1.665V ±2% comparator, while RESET IN pin monitors a second supply using a fixed 1.235V ±0.8% threshold. An external resistor divider on RESET IN sets the actual trip point (VMON_TH = 1.235V × (R1 + R2)/R2), enabling precise supervision of auxiliary rails like 3.3V or 5V supplies.
How does the extended watchdog mode work on MAX6751KA17+T?
The MAX6751KA17+T extends its watchdog timeout by 128× when the WDS pin is pulled high to VCC. With CSWT = 100pF, normal mode yields ~0.506ms timeout, while extended mode gives ~64.77ms. The watchdog timer clears on any WDI falling edge or WDS transition, and begins counting only after RESET deassertion - ensuring reliable detection of firmware hangs across diverse software cycles.
Is MAX6751KA17+T qualified for automotive applications?
Yes, MAX6751KA17+T is AEC-Q100 qualified (Grade 0: −40°C to +125°C) and fully specified across that range for voltage thresholds, timing parameters, and supply current. Its transient immunity (≤50µs rejection at 100mV overdrive), guaranteed RESET validity down to VCC = 1.0V, and SOT23 package robustness meet automotive ECU requirements per ISO 16750.
What is the function of the SRT and SWT pins on MAX6751KA17+T?
SRT (pin 4) connects to a capacitor (CSRT) that sets the reset timeout period (tRP = 4.94×10⁶ × CSRT), ranging from 0.506ms to 9.487ms. SWT (pin 3) connects to a capacitor (CSWT) that sets the base watchdog timeout (tWD = 4.94×10⁶ × CSWT); WDS pin then scales it ×1 or ×128. Both capacitors must be low-leakage (<10nA), with ceramic types recommended.
MAX6751KA17+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:
- 2
- Voltage - Threshold:
- 1.665V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 5.692ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6751KA17+T FAQ
1.How can I place an order for MAX6751KA17+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6751KA17+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 MAX6751KA17+T reliable?
The price and inventory of MAX6751KA17+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6751KA17+T is usually 5 days.
3.What payment methods are accepted for MAX6751KA17+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6751KA17+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6751KA17+T?
MAX6751KA17+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6751KA17+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 MAX6751KA17+T?
For technical support, including MAX6751KA17+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6751KA17+T requirements.
6.How does Aetrix verify that MAX6751KA17+T is sourced from the original manufacturer or authorized distributors?
All MAX6751KA17+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 MAX6751KA17+T meets industry standards.
7.What is the process for return or replacement of MAX6751KA17+T?
All MAX6751KA17+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6751KA17+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 MAX6751KA17+T part is unused and in its original packaging.
Return procedure for MAX6751KA17+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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