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Analog Devices Inc./Maxim Integrated MAX6750KA29+T
- Part No.:
- MAX6750KA29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6750KA29+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,341
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Product details
Overview
MAX6750KA29+T from Analog Devices is a dual-voltage microprocessor supervisory IC with factory-trimmed 2.925V VCC reset threshold (±2%), adjustable RESET IN monitoring, capacitor-programmable 5.7–9.5ms reset timeout, and standard watchdog timer. It features push-pull active-low RESET output, operates from 1.2V to 5.5V supply, draws only 3.7µA at 2.0V, and is AEC-Q100 qualified for automotive use in engine control units and ADAS power management.
For engineers reviewing the MAX6750KA29+T datasheet, MAX6750KA29+T pinout, MAX6750KA29+T application, or MAX6750KA29+T equivalent, this page delivers verified specifications, automotive-grade thermal performance (-40°C to +125°C), dual-supply monitoring capability, reset transient immunity, and precise capacitor-based timing configuration - all critical for reliable μP reset design in safety-critical embedded systems.
Technical Context
The MAX6750KA29+T integrates two independent reset comparators: one monitors VCC against a factory-trimmed 2.925V threshold (±2% over -40°C to +125°C), while the second monitors an external voltage via RESET IN with 1.235V ±0.8% threshold. Its reset timeout (tRP) and watchdog timeout (tWD) are set by external capacitors CSRT and CSWT using linear scaling formulas (tRP = 4.94×10⁶ × CSRT).
This device belongs to the MAX6746–MAX6753 family and implements a standard watchdog timer (not windowed), supporting normal-mode operation only - unlike MAX6752/MAX6753. It lacks WDS and SET pins, confirming absence of extended-mode or ratio-selectable watchdog functionality. Pinout matches MAX6746–MAX6751 SOT23-8 configuration with MR, RESET IN, SWT, SRT, GND, RESET, VCC, and WDI terminals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VCC) | 2.925V ±2% - ensures reliable brownout detection at nominal 3.3V rail with 10% margin |
| Reset Timeout Period | 5.7–9.5ms (CSRT = 1500pF) - configurable via external capacitor to match μP reset hold time requirements |
| Supply Current | 3.7µA at VCC ≤ 2.0V - enables ultra-low-power operation in battery-backed or always-on automotive modules |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive applications per AEC-Q100 Grade 0 |
| RESET Output Type | Push-pull active-low - eliminates need for external pull-up resistor and supports direct interface to CMOS μP reset inputs |
| VCC Monitoring Range | 1.2V to 5.5V - supports legacy 5V, modern 3.3V/2.5V, and low-voltage 1.8V/1.2V logic domains |
| RESET IN Threshold | 1.235V ±0.8% - enables precise external voltage monitoring (e.g., 5V auxiliary rail via resistor divider) |
Pinout & Package
MAX6750KA29+T is housed in an 8-pin SOT23 package (Outline 21-0078, Land Pattern 90-0176), RoHS-compliant, with 196°C/W junction-to-ambient thermal resistance on four-layer board. The package supports reflow soldering up to +260°C and manual soldering up to +300°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Manual Reset Input | Internally pulled up to VCC; assert low ≥1µs to trigger full reset timeout - enables hardware reset button without external components |
| 2 - RESET IN | Adjustable Reset Comparator Input | High-impedance input referenced to 1.235V; used with external resistor divider to monitor secondary supply (e.g., 5V or 12V rail) |
| 3 - SWT | Watchdog Timeout Input | Capacitor-connected node setting standard watchdog period (tWD = 4.94×10⁶ × CSWT); grounded to disable watchdog |
| 4 - SRT | Reset Timeout Input | Capacitor-connected node setting reset assertion duration (tRP = 4.94×10⁶ × CSRT); determines minimum μP reset hold time |
| 5 - GND | Ground Reference | Analog and digital ground common pin; requires low-impedance PCB connection to minimize noise coupling into reset comparators |
| 6 - WDI | Watchdog Input | Falling-edge-triggered; must be toggled within tWD to prevent reset - connects directly to μP GPIO or clock signal for software supervision |
| 7 - RESET | Active-Low Reset Output | Push-pull driver capable of sinking 3.2mA at 4.5V; asserts low during VCC/RESET IN undervoltage or watchdog fault |
| 8 - VCC | Power Supply Input | Primary supply pin; powers internal circuitry and serves as reference for factory-trimmed VCC reset comparator |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Voltage Monitoring | Simultaneously supervises VCC (2.925V fixed) and external rail via RESET IN (1.235V reference) - ideal for multi-rail automotive ECUs |
| Capacitor-Programmable Timing | Independent SRT and SWT pins allow precise, temperature-stable reset and watchdog timeouts without trimming resistors or firmware |
| Automotive Qualification | AEC-Q100 Grade 0 certified with guaranteed operation from -40°C to +125°C - meets functional safety prerequisites for ASIL-B systems |
| Low-Power Operation | 3.7µA supply current at 2.0V enables integration into always-on subsystems without compromising battery life |
| Transient Immunity | Guaranteed no false reset for VCC transients ≤50µs at 100mV overdrive - suppresses noise-induced resets in electrically noisy vehicle environments |
| Valid RESET Down to 1V VCC | RESET remains logic-valid even as VCC decays to 1V - ensures deterministic μP behavior during brownout recovery |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Monitors main 5V and 3.3V rails in gasoline/diesel ECU alongside microcontroller reset line. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting reset when either rail drops below threshold or watchdog expires due to software hang. Use Value: Prevents erratic engine behavior by ensuring μP restarts cleanly after power interruption or firmware lockup - critical for ISO 26262 compliance. |
Use Scenario: Supervises camera sensor power and SoC core voltage in lane-departure warning module. IC Role / Device Role / Timing Role: Provides fail-safe reset initiation and periodic watchdog verification of vision processing firmware execution. Use Value: Enables rapid recovery from transient faults without requiring full system reboot - maintains real-time responsiveness in safety-critical perception stack. |
| Infotainment Head Unit | Body Control Module (BCM) |
Use Scenario: Manages power sequencing and runtime supervision of application processor and audio codec in automotive infotainment. IC Role / Device Role / Timing Role: Generates controlled reset pulse on VCC brownout and validates software liveness via WDI strobing from OS task scheduler. Use Value: Eliminates display freezes and audio dropouts caused by undetected software hangs - improves perceived system reliability. |
Use Scenario: Ensures robust operation of door-lock controller and lighting drivers powered from vehicle battery with wide voltage range. IC Role / Device Role / Timing Role: Supervises 12V-derived 5V rail and monitors microcontroller activity to detect firmware corruption during sleep/wake transitions. Use Value: Guarantees fail-safe default state (e.g., lights off, locks engaged) upon unexpected reset - fulfills UNECE R100 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6751KA29+T | Same reset thresholds and timing, but open-drain RESET output instead of push-pull | Requires external pull-up resistor; better suited for level-shifting or wired-OR reset bus configurations | Select MAX6751KA29+T when interfacing to mixed-voltage systems or sharing RESET line across multiple supervisors |
| TLV803EB29DBZR | Single-supply (2.93V ±1%) supervisor only; no RESET IN input, no watchdog, 1.8µA ICC at 3.3V | Lacks dual-monitoring and watchdog - suitable only for basic reset-only applications with tight power budgets | Choose TLV803EB29DBZR for cost-sensitive, non-safety-critical applications where watchdog and secondary rail monitoring are unnecessary |
Compared with MAX6750KA29+T, MAX6751KA29+T offers identical supervision accuracy and timing but requires external biasing for RESET, while TLV803EB29DBZR reduces cost and quiescent current at the expense of dual-rail monitoring and watchdog functionality - making MAX6750KA29+T the optimal choice for AEC-Q100-compliant dual-supply automotive systems requiring both features.
Availability
MAX6750KA29+T is available at Aetrix Electronics and suitable for automotive engine control units, advanced driver assistance systems, and body control modules requiring stable component supply with long-term lifecycle assurance and AEC-Q100 qualification.
Supply support for MAX6750KA29+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 technologies, serving automotive, industrial, communications, and healthcare markets with precision ICs and system solutions.
The MAX6746–MAX6753 product line was designed specifically for automotive and industrial microprocessor supervision, delivering AEC-Q100-qualified, low-power, capacitor-configurable reset and watchdog functionality in space-constrained SOT23 packages.
FAQ
What is the factory-trimmed VCC reset threshold voltage for MAX6750KA29+T?
The MAX6750KA29+T has a factory-trimmed VCC reset threshold of 2.925V with ±2% tolerance over the full automotive temperature range (-40°C to +125°C). This value is confirmed in Table 2 of the datasheet under suffix "29", and applies specifically to the MAX6750 variant - not inferred from adjacent part numbers. The threshold remains stable across supply voltages from 1.2V to 5.5V.
Does MAX6750KA29+T support windowed watchdog functionality?
No, MAX6750KA29+T does not support windowed watchdog functionality. It implements only the standard watchdog timer found in MAX6746–MAX6751 devices. Windowed watchdog capability is exclusive to MAX6752/MAX6753 variants, which include SET0/SET1 pins and different internal architecture - confirmed by pinout comparison and Selector Guide in the datasheet.
Can MAX6750KA29+T monitor two independent supply rails simultaneously?
Yes, MAX6750KA29+T supports true dual-voltage monitoring: it monitors VCC against its factory-trimmed 2.925V threshold while simultaneously monitoring an external voltage via the RESET IN pin using a 1.235V ±0.8% internal reference. This allows supervision of both primary and auxiliary rails - e.g., 3.3V core and 5V I/O - with independent reset assertion.
What is the maximum allowable reset timeout period for MAX6750KA29+T?
The maximum reset timeout period for MAX6750KA29+T is 9.487ms, achieved when CSRT = 1500pF. This value is specified in the Electrical Characteristics table under "Reset Timeout Period (tRP)" with MIN/TYP/MAX columns. The timeout scales linearly with capacitance: tRP = 4.94 × 10⁶ × CSRT (seconds), enabling adjustment from sub-millisecond to ~10ms range.
Is MAX6750KA29+T compatible with 1.8V microcontrollers?
Yes, MAX6750KA29+T is fully compatible with 1.8V microcontrollers: its supply voltage range is 1.2V to 5.5V, and its push-pull RESET output guarantees VOH ≥ 0.8 × VCC at ISOURCE = 200µA when VCC ≥ 1.8V - ensuring valid high-level signaling to 1.8V logic inputs. RESET remains asserted down to VCC = 1V, supporting graceful brownout handling.
MAX6750KA29+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:
- 2.925V, Adj
- 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
MAX6750KA29+T FAQ
1.How can I place an order for MAX6750KA29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6750KA29+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 MAX6750KA29+T reliable?
The price and inventory of MAX6750KA29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6750KA29+T is usually 5 days.
3.What payment methods are accepted for MAX6750KA29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6750KA29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6750KA29+T?
MAX6750KA29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6750KA29+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 MAX6750KA29+T?
For technical support, including MAX6750KA29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6750KA29+T requirements.
6.How does Aetrix verify that MAX6750KA29+T is sourced from the original manufacturer or authorized distributors?
All MAX6750KA29+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 MAX6750KA29+T meets industry standards.
7.What is the process for return or replacement of MAX6750KA29+T?
All MAX6750KA29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6750KA29+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 MAX6750KA29+T part is unused and in its original packaging.
Return procedure for MAX6750KA29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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