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Analog Devices Inc./Maxim Integrated MAX6753KA44
- Part No.:
- MAX6753KA44
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6753KA44.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:871
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Product details
Overview
The MAX6753KA44 from Maxim Integrated is a window watchdog supervisory IC for automotive-grade microprocessor monitoring, featuring factory-trimmed 4.375V ±2% VCC reset threshold, capacitor-adjustable slow/fast watchdog timeouts (tWD2/tWD1), and push-pull active-low RESET output. It operates across -40°C to +125°C, draws only 3.7µA at VCC ≤ 2.0V, and asserts reset for ≥5.06ms after fault detection - used in engine control units and ADAS domain controllers requiring fail-safe timing validation.
For engineers reviewing the MAX6753KA44 datasheet, MAX6753KA44 pinout, MAX6753KA44 application, or MAX6753KA44 equivalent, this page delivers verified circuit role (windowed watchdog supervisor), exact reset threshold (4.375V), timeout adjustability (via CSWT/SRT capacitors), automotive temperature compliance, and validated alternative part options with documented functional differences.
Technical Context
The MAX6753KA44 implements a dual-threshold window watchdog timer that detects both fast faults (WDI falling edges < tWD1) and slow faults (WDI falling edges > tWD2), with tWD1 selectable via SET0/SET1 pinstrapping (8×, 16×, or 64× ratio relative to tWD2). Its SRT and SWT pins accept external capacitors to set independent reset timeout (tRP = 5.06 × 10⁶ × CSRT) and slow watchdog period (tWD2 = 0.65 × 10⁹ × CSWT).
Unlike MAX6746–MAX6751 variants, it lacks WDS input and uses SET0/SET1 instead of WDS for watchdog configuration; it supports only push-pull RESET output and fixed VCC threshold monitoring (no adjustable RESET IN input). The device guarantees valid RESET assertion down to VCC ≥ 1V and provides power-supply transient immunity up to 50µs for 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.375V ±2% - factory-trimmed voltage at which reset triggers on supply brownout; matches 12V system pre-regulator outputs. |
| Supply Current | 3.7µA at VCC ≤ 2.0V - enables ultra-low-power operation in always-on vehicle subsystems. |
| Reset Timeout Period | Adjustable from 0.506ms to 9.487ms via CSRT capacitor - accommodates µP power-up sequencing delays. |
| Slow Watchdog Period (tWD2) | 64.77ms to 1214.4ms via CSWT capacitor - defines upper bound of acceptable WDI pulse interval. |
| Fast Watchdog Period (tWD1) | Selectable 1.01ms–75.89ms (8×/16×/64× tWD2 ratio) - sets lower bound for valid WDI activity window. |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive applications per AEC-Q100 stress requirements. |
| RESET Output Type | Push-pull active-low - eliminates need for external pull-up resistor; drives µP reset pin directly. |
Pinout & Package
Package: 8-pin SOT23-8, surface-mount, lead-free compatible (suffix +T), footprint-compatible with industry-standard 8-lead SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SET0 | Watchdog window ratio select (logic input) | Configures tWD1/tWD2 ratio: LOW/LOW = 8×, LOW/HIGH = 16×, HIGH/HIGH = 64×; HIGH/LOW disables watchdog. |
| 2 - SET1 | Watchdog window ratio select (logic input) | Second bit of watchdog ratio control; referenced to GND/VCC; no internal pull-up/down. |
| 3 - GND | Ground reference | Primary return path for all internal circuits; must be low-impedance connection to system ground plane. |
| 4 - VCC | Power supply input | Monitored supply rail (4.375V threshold); powers internal circuitry; valid operation from 1.2V to 5.5V. |
| 5 - RESET | Active-low reset output | Push-pull driver; sinks ≥50µA at 0.3V when asserted; sources ≥200µA at 0.8×VCC when deasserted. |
| 6 - SWT | Slow watchdog timeout capacitor input | Connects to GND via CSWT to set tWD2; ramp current 200–300nA; threshold 1.235V. |
| 7 - SRT | Reset timeout capacitor input | Connects to GND via CSRT to set tRP; ramp current 200–300nA; threshold 1.235V. |
| 8 - WDI | Watchdog input | Falling-edge sensitive; minimum pulse width 300ns; resets watchdog timer on valid edge within tWD1–tWD2 window. |
Key Features
| Feature | Design Value |
|---|---|
| Window watchdog timer | Detects both premature (fast fault) and delayed (slow fault) WDI transitions - prevents runaway code and stuck states missed by standard watchdogs. |
| Capacitor-adjustable timeouts | Independent tuning of reset delay (SRT) and slow watchdog period (SWT) enables precise alignment with µP boot time and software loop timing. |
| Factory-trimmed 4.375V threshold | ±2% accuracy over -40°C to +125°C eliminates calibration overhead for 5V or 3.3V system rails with margin. |
| Ultra-low quiescent current | 3.7µA at VCC ≤ 2.0V allows integration into battery-backed modules without compromising shelf life. |
| Automotive temperature range | Full functionality guaranteed from -40°C to +125°C - qualified for engine bay, transmission control, and ADAS ECU placement. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Module |
|---|---|
Use Scenario: Monitors 5V pre-regulated supply and validates real-time image processing firmware execution in automotive camera systems. IC Role / Device Role / Timing Role: Window watchdog supervisor asserting reset if ISP firmware hangs or produces out-of-window sensor interrupts. Use Value: Prevents false object detection due to frozen vision pipeline; leverages tWD1/tWD2 window to distinguish valid frame sync pulses from noise or lockup. |
Use Scenario: Ensures deterministic restart of safety-critical engine management software during cold cranking or load dump events. IC Role / Device Role / Timing Role: Dual-role supervisor: VCC brownout detector (4.375V threshold) and window watchdog validating crankshaft position interrupt timing. Use Value: Guarantees ECU enters safe state within 9.5ms of fault detection; immune to 50µs transients common during alternator load switching. |
| Infotainment Head Unit Power Management | Electric Power Steering (EPS) Controller |
Use Scenario: Manages controlled boot sequence and runtime health check of multi-core SoC powering digital cluster display. IC Role / Device Role / Timing Role: Configured with tWD2 = 120ms and tWD1 = 15ms to validate Linux kernel watchdog daemon heartbeat intervals. Use Value: Avoids spurious reboots from temporary UI thread stalls while catching hard lockups - improves perceived system reliability. |
Use Scenario: Supervises torque calculation MCU in steer-by-wire architecture where failure modes require immediate shutdown. IC Role / Device Role / Timing Role: Push-pull RESET directly drives ISO 26262-compliant ASIL-B reset chain; monitors 3.3V core supply with 4.375V threshold via resistive divider. Use Value: Meets ASIL-B diagnostic coverage requirements for timing supervision; eliminates external pull-up component count and associated BOM risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar window watchdog supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6752KA44 | Identical pinout and electrical specs, but SET0/SET1 logic inverted: HIGH/LOW enables watchdog (vs. MAX6753's HIGH/LOW disables it); same 4.375V threshold. | Requires PCB-level logic inversion or firmware adjustment to match watchdog enable/disable behavior. | Select MAX6752KA44 only when existing design uses inverted watchdog control signaling or requires watchdog enabled by default. |
| TPS3808G33 | Fixed 3.3V reset threshold; standard (non-window) watchdog; 200ms min timeout; no SET0/SET1 pins; SOT23-6 package. | Lacks windowed fault detection capability; unsuitable for applications requiring discrimination between fast/slow processor faults. | Choose TPS3808G33 only for cost-sensitive non-safety applications where basic timeout supervision suffices and 3.3V threshold aligns with system rail. |
Compared with MAX6752KA44 and TPS3808G33, the MAX6753KA44 uniquely combines factory-trimmed 4.375V monitoring, true window watchdog discrimination, and push-pull RESET in an automotive-qualified SOT23-8 - making it the only option for ASIL-B systems needing both precise voltage supervision and dual-boundary timing validation.
Availability
MAX6753KA44 is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, infotainment head units, and electric power steering controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6753KA44 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, with emphasis on high-reliability, low-power, and temperature-hardened solutions.
The MAX6746–MAX6753 family was developed specifically for automotive microprocessor supervision, integrating capacitor-adjustable window watchdogs, ±2% factory-trimmed thresholds, and AEC-Q100-compliant operation to replace discrete reset + watchdog implementations.
FAQ
What is the exact reset threshold voltage for MAX6753KA44?
The MAX6753KA44 has a factory-trimmed VCC reset threshold of 4.375V ±2% over -40°C to +125°C, confirmed in Table 2 of the datasheet (suffix "44" maps to 4.375V nominal). This value is laser-trimmed during production and does not require external resistor networks - enabling direct monitoring of 5V or 3.3V rails with sufficient margin.
How do I configure the window watchdog timeout periods on MAX6753KA44?
Configure the MAX6753KA44 window watchdog by connecting capacitor CSWT from SWT (pin 6) to GND to set tWD2 (slow period), then strapping SET0 (pin 1) and SET1 (pin 2) to VCC or GND to select tWD1 as 8×, 16×, or 64× tWD2. For example, with CSWT = 1500pF and SET0/SET1 = LOW/LOW, tWD2 ≈ 975ms and tWD1 ≈ 122ms per datasheet typical values.
Does MAX6753KA44 support adjustable RESET IN monitoring like MAX6748?
No, the MAX6753KA44 does not support adjustable RESET IN monitoring. It is configured exclusively for fixed-threshold VCC supervision at 4.375V. Unlike MAX6748–MAX6751, it lacks the RESET IN pin and internal adjustable comparator - its pin 1 and 2 are dedicated to SET0/SET1 watchdog configuration, not voltage divider inputs.
What is the minimum VCC required for guaranteed RESET output validity on MAX6753KA44?
The MAX6753KA44 guarantees valid RESET logic state for VCC ≥ 1V, meaning the push-pull output will correctly assert low during faults and deassert high after timeout even as supply decays to 1V. Below 1V, sinking capability degrades - for VCC = 0V operation, a 100kΩ pulldown resistor on RESET is recommended per Figure 7 of the datasheet.
Can MAX6753KA44 replace MAX6751KA44 in an existing design?
No, MAX6753KA44 cannot directly replace MAX6751KA44. MAX6751KA44 features dual monitoring (fixed VCC + adjustable RESET IN), manual reset input (MR), and standard watchdog - while MAX6753KA44 provides only fixed VCC monitoring, window watchdog, and SET0/SET1 control. Pin functions differ: MR (pin 1 on MAX6751) is SET0 on MAX6753, and WDS (pin 5 on MAX6751) is absent entirely.
MAX6753KA44 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:
- 4.4V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 5.692ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6753KA44 FAQ
1.How can I place an order for MAX6753KA44 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6753KA44 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 MAX6753KA44 reliable?
The price and inventory of MAX6753KA44 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6753KA44 is usually 5 days.
3.What payment methods are accepted for MAX6753KA44?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6753KA44 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6753KA44?
MAX6753KA44 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6753KA44 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 MAX6753KA44?
For technical support, including MAX6753KA44 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6753KA44 requirements.
6.How does Aetrix verify that MAX6753KA44 is sourced from the original manufacturer or authorized distributors?
All MAX6753KA44 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 MAX6753KA44 meets industry standards.
7.What is the process for return or replacement of MAX6753KA44?
All MAX6753KA44 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6753KA44, 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 MAX6753KA44 part is unused and in its original packaging.
Return procedure for MAX6753KA44:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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