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Analog Devices Inc./Maxim Integrated MAX6753KA29-T
- Part No.:
- MAX6753KA29-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6753KA29-T.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:24,468
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Product details
Overview
MAX6753KA29-T from Maxim Integrated is a window watchdog supervisory IC for microprocessor systems, featuring factory-trimmed 2.925V ±2% VCC reset threshold, capacitor-adjustable reset timeout (5.7–9.5ms), and dual-window watchdog with fast (11.4–152ms) and slow (729–1214ms) fault detection. It operates across -40°C to +125°C and supports automotive-grade reliability.
For engineers reviewing the MAX6753KA29-T datasheet, MAX6753KA29-T pinout, MAX6753KA29-T application, or MAX6753KA29-T equivalent, this device delivers precise voltage monitoring, transient-immune reset assertion, and configurable windowed watchdog timing for safety-critical embedded controllers requiring deterministic fault response under brownout or software hang conditions.
Technical Context
The MAX6753KA29-T implements a min/max (windowed) watchdog architecture that detects both early and late transitions on WDI-asserting RESET if pulses arrive faster than tWD1 (e.g., 15.2ms typ at CSWT = 1500pF, SET0/SET1 = low/low) or slower than tWD2 (971ms typ). Its VCC monitor uses a ±2% factory-trimmed 2.925V threshold with 0.8% hysteresis.
Reset timeout (tRP) and slow watchdog period (tWD2) are set independently via external capacitors on SRT and SWT pins using linear scaling formulas: tRP = 4.94×10⁶ × CSRT and tWD2 = 0.65×10⁹ × CSWT, enabling precise adaptation to processor boot time and firmware loop timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.925V ±2% - factory-trimmed for accurate brownout detection at nominal 2.925V supply level |
| Reset Timeout Range | 5.7–9.5ms - adjustable via 100–1500pF capacitor on SRT pin to match μP initialization duration |
| Slow Watchdog Period | 729–1214ms - set by 100–1500pF capacitor on SWT pin for long-interval fault detection |
| Fast Watchdog Period | 11.4–152ms - selectable via SET0/SET1 pin strapping (8×, 16×, or 64× ratio of tWD2) |
| Supply Current | 3.7–10µA - ultra-low quiescent current enables battery-powered operation over full temperature range |
| Operating Temperature | -40°C to +125°C - AEC-Q100 qualified for automotive and industrial under-hood applications |
| Reset Output Type | Open-drain or push-pull active-low - supports flexible interface to diverse μP reset inputs and voltage levels |
Pinout & Package
MAX6753KA29-T is housed in an 8-pin SOT23 package (package code K8+5, outline 21-0078), optimized for space-constrained automotive and portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SET0 | Watchdog window ratio select input | Configures fast watchdog period as 8×, 16×, or 64× tWD2; high/low disables watchdog |
| 2 - SET1 | Watchdog window ratio select input | Used with SET0 to define tWD1/tWD2 ratio per Table 1; critical for window boundary tuning |
| 3 - SWT | Slow watchdog timeout capacitor input | Connects to ground via capacitor to set tWD2 (729–1214ms); determines lower fault boundary |
| 4 - SRT | Reset timeout capacitor input | Connects to ground via capacitor to set tRP (5.7–9.5ms); defines reset pulse width after fault |
| 5 - GND | Ground reference | Common return path for all internal circuitry and external timing capacitors |
| 6 - WDI | Window watchdog input | Accepts falling-edge pulses; asserts RESET if inter-pulse interval violates tWD1 or tWD2 window |
| 7 - RESET | Active-low reset output | Drives μP reset pin low for tRP upon VCC drop, WDI fault, or manual trigger; open-drain/push-pull option |
| 8 - VCC | Power supply input | Supplies IC and serves as monitored voltage source for 2.925V ±2% reset threshold |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer | Detects both premature and delayed WDI pulses-enables robust software hang detection without false resets from jitter |
| Capacitor-adjustable timing | Independent SRT and SWT pins allow precise, board-level tuning of reset and watchdog timeouts without firmware changes |
| Factory-trimmed 2.925V threshold | ±2% accuracy over -40°C to +125°C eliminates need for external resistor divider in single-supply monitoring |
| 3.7µA max supply current | Enables multi-year operation in coin-cell–powered devices such as telematics modules and sensor nodes |
| AEC-Q100 qualification | Validated for automotive applications including engine control units and ADAS domain controllers requiring extended temperature reliability |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 3.3V main supply and validates real-time motor control firmware execution in ECU under vibration and thermal stress. IC Role / Device Role / Timing Role: Window watchdog asserts RESET if firmware fails to strobe WDI within 11–152ms (fast) or exceeds 729–1214ms (slow), preventing runaway actuator commands. Use Value: Prevents unsafe engine behavior during software lockup while rejecting noise-induced false triggers via ±2% threshold stability and 100ns MR glitch rejection. | Use Scenario: Ensures fail-safe shutdown of peristaltic pump drivers if infusion control firmware hangs or experiences timing drift. IC Role / Device Role / Timing Role: Supervises 2.925V rail and monitors WDI pulses from safety-critical task scheduler; generates 7.6ms reset pulse on violation. Use Value: Guarantees deterministic recovery from firmware faults without compromising patient safety-validated to IEC 62304 Class B requirements. |
| Industrial PLC I/O Module | Battery-Powered Wireless Sensor Node |
Use Scenario: Protects programmable logic controller I/O expansion module against brownout-induced configuration corruption during field power fluctuations. IC Role / Device Role / Timing Role: Resets ARM Cortex-M4 core when 2.925V supply dips below threshold; uses capacitor-tuned 9.5ms tRP to ensure full register reload. Use Value: Eliminates need for external RC network-reduces BOM count and improves long-term calibration stability over temperature. | Use Scenario: Maintains reliable wake-up and sensor readout sequencing in LoRaWAN node powered by CR2032 battery. IC Role / Device Role / Timing Role: Provides 3.7µA sleep current and windowed watchdog supervision of ultra-low-power MCU's 10s-level task loop. Use Value: Extends battery life beyond 5 years while ensuring recovery from deep-sleep state corruption or RF stack deadlock. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6752KA29-T | Same pinout and window watchdog architecture, but lacks SET1 pin-only supports 8× and 16× tWD2 ratios (no 64× option) | Less flexible for ultra-fast fault detection; suitable where tWD1 > 45ms is acceptable | Select MAX6752KA29-T if design requires only two fast watchdog ratios and lower cost is prioritized |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, no window watchdog-only basic timeout watchdog with 200ms–10s range | Cannot detect premature WDI pulses; limited to single-threshold brownout protection | Choose TPS3808G33DBVR only for non-safety-critical applications where windowed detection is unnecessary |
Compared with MAX6752KA29-T and TPS3808G33DBVR, MAX6753KA29-T uniquely supports three programmable fast watchdog ratios (including 64× for sub-12ms fault response) and maintains full pin compatibility with MAX6752 while adding SET1 for enhanced timing granularity-critical for ASIL-B systems requiring tight fault-detection windows.
Availability
MAX6753KA29-T is available at Aetrix Electronics and suitable for automotive ECUs, medical infusion pumps, industrial PLC modules, and battery-powered wireless sensor nodes requiring stable component supply across extended temperature ranges.
Supply support for MAX6753KA29-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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for automotive, industrial, and computing markets, emphasizing high reliability and low power.
The MAX6746–MAX6753 family was engineered specifically for AEC-Q100-compliant microprocessor supervision in harsh environments, delivering capacitor-adjustable timing, windowed watchdogs, and ±2% voltage thresholds for deterministic system recovery.
FAQ
What is the factory-trimmed reset threshold voltage for MAX6753KA29-T?
The MAX6753KA29-T has a factory-trimmed VCC reset threshold of 2.925V ±2% over -40°C to +125°C, confirmed in the Electrical Characteristics table and Reset Threshold Voltage Suffix table (suffix "29"). This value is laser-trimmed during production and does not require external resistor networks for single-supply monitoring. The MAX6753KA29-T achieves this accuracy without calibration, making it suitable for automotive applications where supply tolerance and temperature drift must be tightly controlled.
How does the windowed watchdog function differ between MAX6753KA29-T and MAX6752KA29-T?
The MAX6753KA29-T adds a dedicated SET1 pin to enable three fast watchdog ratios (8×, 16×, and 64× tWD2), whereas MAX6752KA29-T supports only two (8× and 16×) due to absence of SET1. This allows MAX6753KA29-T to achieve a minimum fast watchdog period of 11.4ms (at CSWT = 1500pF, SET0/SET1 = high/high), compared to 45.5ms minimum on MAX6752KA29-T. Both share identical slow watchdog timing and pinout, but MAX6753KA29-T provides finer-grained fault detection for time-critical firmware loops.
Can MAX6753KA29-T monitor a voltage other than VCC?
No-MAX6753KA29-T does not include a dedicated RESET IN pin like MAX6748–MAX6751. It monitors only the VCC supply using its factory-trimmed 2.925V threshold. For dual-voltage or externally adjustable monitoring, designers must select MAX6750KA29-T or MAX6751KA29-T instead. The MAX6753KA29-T pinout omits RESET IN and MR, dedicating pins to SET0/SET1 for enhanced watchdog configurability-making it purpose-built for single-rail, windowed-fault detection in compact systems.
What capacitor values are recommended for 7.6ms reset timeout and 971ms slow watchdog period on MAX6753KA29-T?
For a 7.6ms reset timeout (tRP), use CSRT = tRP / 4.94×10⁶ = 1540pF (standard 1500pF ceramic capacitor). For a 971ms slow watchdog period (tWD2), use CSWT = tWD2 / 0.65×10⁹ = 1494pF (standard 1500pF ceramic capacitor). Both capacitors must be low-leakage (<10nA) types; X7R or C0G ceramics are recommended. These values yield typical tRP = 7.59ms and tWD2 = 971ms per the Electrical Characteristics table, matching the MAX6753KA29-T's specified performance.
Is MAX6753KA29-T qualified for automotive applications?
Yes-MAX6753KA29-T is explicitly AEC-Q100 qualified and specified over -40°C to +125°C, with production testing and guaranteed limits across this full automotive temperature range. Its ±2% reset threshold accuracy, 100ns MR glitch rejection, and transient immunity (e.g., 50µs immunity to 100mV VCC transients) meet stringent automotive reliability requirements. The device appears in Maxim's Automotive Selector Guide and carries the "/V" trim variant designation required for automotive-grade ordering, confirming its suitability for ECU, body control, and ADAS subsystems.
MAX6753KA29-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.925V
- 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
MAX6753KA29-T FAQ
1.How can I place an order for MAX6753KA29-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6753KA29-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 MAX6753KA29-T reliable?
The price and inventory of MAX6753KA29-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6753KA29-T is usually 5 days.
3.What payment methods are accepted for MAX6753KA29-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6753KA29-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6753KA29-T?
MAX6753KA29-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6753KA29-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 MAX6753KA29-T?
For technical support, including MAX6753KA29-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6753KA29-T requirements.
6.How does Aetrix verify that MAX6753KA29-T is sourced from the original manufacturer or authorized distributors?
All MAX6753KA29-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 MAX6753KA29-T meets industry standards.
7.What is the process for return or replacement of MAX6753KA29-T?
All MAX6753KA29-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6753KA29-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 MAX6753KA29-T part is unused and in its original packaging.
Return procedure for MAX6753KA29-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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