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Analog Devices Inc./Maxim Integrated MAX6753KA23+
- Part No.:
- MAX6753KA23+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6753KA23+.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
- Shipping:
Inventory:2,094
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Product details
Overview
MAX6753KA23+ from Analog Devices is a window watchdog supervisory IC for microprocessor systems, featuring factory-trimmed 2.313V ±2% VCC reset threshold, adjustable slow/fast watchdog timeout via external capacitor and pin-strapped ratio (8×/16×/64×), push-pull active-low RESET output, and operation over -40°C to +125°C. It monitors single supply voltage and asserts reset on VCC brownout, manual reset, or watchdog window violation in automotive and medical embedded controllers.
For engineers reviewing the MAX6753KA23+ datasheet, MAX6753KA23+ pinout, MAX6753KA23+ application, or MAX6753KA23+ equivalent, this page delivers verified electrical parameters, automotive-grade thermal and transient immunity specs, SOT23-8 pin mapping, and two validated alternative parts with documented functional and timing differences.
Technical Context
The MAX6753KA23+ implements a dual-threshold window watchdog timer: slow timeout (tWD2) set by CSWT capacitor (e.g., 975ms typ at 1500pF), and fast timeout (tWD1) selected via SET0/SET1 logic pins (e.g., 122ms typ at 8× ratio). It uses internal ramp comparators (SRT/SWT) with 200–300nA charging current and 1.173–1.297V thresholds to generate precise, temperature-stable timeouts.
Unlike standard watchdogs, it detects both early (tWDI < tWD1) and late (tWDI > tWD2) WDI transitions - not just missed pulses - enabling robust detection of runaway or stalled firmware. RESET remains asserted for a capacitor-adjustable period (tRP = 4.94×10⁶ × CSRT) after any fault, with guaranteed validity down to VCC ≥ 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.313V ±2% (factory-trimmed, AEC-Q100 qualified for automotive) |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V - enables ultra-low-power battery operation |
| Reset Timeout | Adjustable 0.5–9.5ms via CSRT capacitor (e.g., 100pF → 0.506ms, 1500pF → 7.59ms) |
| Slow Watchdog Period | tWD2 = 0.65×10⁹ × CSWT (e.g., 1500pF → 975ms typ; immune to software jitter) |
| Fast Watchdog Ratio | Selectable 8×/16×/64× via SET0/SET1 pins - defines minimum valid pulse interval |
| Operating Temp | -40°C to +125°C - fully specified for under-hood automotive and industrial environments |
| RESET Output | Push-pull active-low, VOL ≤ 0.3V at 50µA - drives µP reset directly without pull-up |
Pinout & Package
MAX6753KA23+ is housed in an 8-pin SOT23 package (Outline 21-0078, RoHS-compliant), optimized for space-constrained automotive PCBs. Thermal resistance θJA = 196°C/W on four-layer board supports continuous operation at full temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | Adjustable reset comparator input | High-impedance node (±1nA leakage); used with external resistor divider to monitor secondary voltage rail |
| 2 - WDS | Watchdog select (not used in MAX6753) | Not connected - MAX6753 uses SET0/SET1 instead; must be tied to GND or VCC per datasheet guidance |
| 3 - SWT | Slow watchdog timeout capacitor input | Connects to ground via CSWT (e.g., 1500pF ceramic); sets tWD2 = 0.65×10⁹ × CSWT |
| 4 - SRT | Reset timeout capacitor input | Connects to ground via CSRT; determines reset assertion duration (tRP = 4.94×10⁶ × CSRT) |
| 5 - GND | Power ground reference | Low-impedance return path; must be routed with minimal inductance for transient immunity |
| 6 - SET1 | Window ratio control input | Logic input (GND = low, VCC = high); selects tWD1/tWD2 ratio with SET0 (e.g., SET0=low/SET1=low → 8×) |
| 7 - RESET | Active-low reset output | Push-pull driver; sinks 50µA @ VOL ≤ 0.3V; directly interfaces µP reset pin without external components |
| 8 - VCC | Main power supply input | Accepts 1.2–5.5V; powers internal circuitry and enables VCC monitoring at 2.313V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Window watchdog architecture | Detects both premature and delayed WDI transitions - prevents false resets from timing jitter while catching stuck/frozen code |
| Factory-trimmed 2.313V threshold | ±2% accuracy over -40°C to +125°C eliminates calibration effort and improves system reliability vs. resistor-based solutions |
| Capacitor-adjustable timeouts | Independent tuning of reset (CSRT) and slow watchdog (CSWT) periods enables precise alignment with µP boot time and firmware loop intervals |
| AEC-Q100 qualification | Validated for automotive applications including engine control, ADAS sensors, and infotainment power management |
| Push-pull RESET output | Eliminates need for external pull-up resistor - reduces BOM count, PCB area, and risk of floating reset line during power ramp |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply and validates firmware heartbeat in safety-critical dosing logic. IC Role / Device Role / Timing Role: Window watchdog enforces strict execution window (e.g., 122ms fast / 975ms slow) to detect motor stall or sensor failure. Use Value: Prevents uncontrolled fluid delivery by asserting reset within 7.59ms if firmware misses expected WDI edge timing. | Use Scenario: Supervises ARM Cortex-M4 in portable infusion device powered by Li-ion battery (2.7–4.2V). IC Role / Device Role / Timing Role: Tracks VCC decay during battery depletion and triggers controlled shutdown before brownout-induced memory corruption. Use Value: Factory-trimmed 2.313V reset threshold ensures deterministic restart at safe voltage margin, extending usable battery life. |
| Industrial PLC I/O Module | Automotive ADAS Camera Sensor |
Use Scenario: Ensures reliable startup and runtime supervision of isolated CAN communication processor in harsh factory environment. IC Role / Device Role / Timing Role: Dual-voltage monitoring capability (via RESET IN) verifies both 5V analog front-end and 3.3V digital core supplies. Use Value: Push-pull RESET output drives optocoupler input directly, eliminating level-shifting components and reducing EMI susceptibility. | Use Scenario: Provides fail-safe reset for image signal processor in rear-view camera exposed to wide ambient temperature swings (-40°C to +105°C). IC Role / Device Role / Timing Role: Guarantees valid RESET state down to VCC = 1V and withstands 100mV/50µs transients per ISO 7637-2 Pulse 4. Use Value: AEC-Q100 qualification and 196°C/W θJA enable uninterrupted operation in compact, thermally constrained camera housing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6752KA32+ | Identical pinout and window watchdog architecture; fixed 3.200V reset threshold (±2%) instead of 2.313V | Suitable for 3.3V systems requiring higher reset threshold; not drop-in for 2.3V rails | Select when VCC nominal is ≥3.0V and tighter hysteresis (0.65–0.90%) is required |
| TLV809E23DBZR | Single-function reset IC only (no watchdog); 2.32V threshold, open-drain output, 1.8–6V supply | Lacks window watchdog - requires external timing circuit or µP firmware for fault detection | Choose for cost-sensitive, non-safety-critical applications where watchdog functionality is handled in software |
Compared with MAX6753KA23+, MAX6752KA32+ offers identical window watchdog timing but targets higher-voltage rails, while TLV809E23DBZR reduces cost and complexity at the expense of integrated hardware-level fault coverage.
Availability
MAX6753KA23+ is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pumps, industrial PLC modules, and ADAS camera sensors requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX6753KA23+ 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 precision instrumentation, industrial automation, and automotive markets.
The MAX6746–MAX6753 family was designed specifically for AEC-Q100-compliant microprocessor supervision in safety-critical automotive and medical systems, emphasizing low quiescent current, transient immunity, and windowed watchdog reliability.
FAQ
What is the exact reset threshold voltage of the MAX6753KA23+?
The MAX6753KA23+ has a factory-trimmed VCC reset threshold of 2.313V ±2% over -40°C to +125°C, corresponding to suffix "23" in the ordering code. This value is confirmed in Table 2 of the datasheet and applies specifically to the MAX6753KA23+ variant - not the broader MAX6753 family.
Does the MAX6753KA23+ support dual-voltage monitoring?
No, the MAX6753KA23+ monitors only the VCC supply voltage using its internal 2.313V threshold. Dual-voltage monitoring (VCC + external rail) is supported only by MAX6750/MAX6751 variants. The MAX6753KA23+ does provide RESET IN as a high-impedance input, but it is not configured for adjustable threshold monitoring in this part.
How do I configure the window watchdog timeout periods for the MAX6753KA23+?
Set the slow watchdog period (tWD2) by connecting capacitor CSWT between SWT (pin 3) and GND (e.g., 1500pF → 975ms typ). Select the fast watchdog ratio (tWD1 = tWD2 ÷ 8, ÷16, or ÷64) using SET0 (pin 2) and SET1 (pin 6): low/low = 8×, low/high = 16×, high/high = 64×. WDS (pin 2) is unused and must be tied.
Is the MAX6753KA23+ pin-compatible with other MAX67xx supervisory ICs?
The MAX6753KA23+ shares the same 8-pin SOT23 footprint and pinout as MAX6746–MAX6751, but functionally differs: it replaces WDS with SET1 and disables manual reset. Pin compatibility does not imply functional interchangeability - substituting MAX6753KA23+ into a MAX6747 design would require redesigning watchdog and reset logic.
What is the minimum supply voltage required for guaranteed RESET functionality in the MAX6753KA23+?
The MAX6753KA23+ guarantees valid RESET output logic state for VCC ≥ 1.0V, with VOL ≤ 0.3V at 50µA sink current. Below 1.0V, RESET may become indeterminate; for operation down to 0V, a 100kΩ pulldown resistor is recommended on the push-pull RESET output per datasheet Figure 7.
MAX6753KA23+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6753KA23+ FAQ
1.How can I place an order for MAX6753KA23+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6753KA23+ 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 MAX6753KA23+ reliable?
The price and inventory of MAX6753KA23+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6753KA23+ is usually 5 days.
3.What payment methods are accepted for MAX6753KA23+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6753KA23+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6753KA23+?
MAX6753KA23+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6753KA23+ 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 MAX6753KA23+?
For technical support, including MAX6753KA23+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6753KA23+ requirements.
6.How does Aetrix verify that MAX6753KA23+ is sourced from the original manufacturer or authorized distributors?
All MAX6753KA23+ 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 MAX6753KA23+ meets industry standards.
7.What is the process for return or replacement of MAX6753KA23+?
All MAX6753KA23+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6753KA23+, 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 MAX6753KA23+ part is unused and in its original packaging.
Return procedure for MAX6753KA23+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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