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Analog Devices Inc./Maxim Integrated MAX6753KA46
- Part No.:
- MAX6753KA46
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6753KA46.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:832
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Product details
Overview
MAX6753KA46 from Maxim Integrated is a window watchdog supervisory IC for automotive-grade microprocessor monitoring, featuring factory-trimmed 4.625V ±2% VCC reset threshold, capacitor-adjustable slow/fast watchdog timeouts (tWD2 = 971.5ms typ, tWD1 = 60.71ms typ at CSWT = 1500pF), and push-pull active-low RESET output. It operates across -40°C to +125°C and consumes only 3.7µA at VCC ≤ 2.0V, targeting critical power-up/brownout protection in engine control units.
For engineers reviewing the MAX6753KA46 datasheet, MAX6753KA46 pinout, MAX6753KA46 application, or MAX6753KA46 equivalent, this page delivers verified electrical parameters, SOT23-8 terminal mapping, window watchdog timing constraints, automotive temperature compliance, and direct alternative part comparisons - all grounded in Maxim's official 19-2530 Rev 3 specification.
Technical Context
The MAX6753KA46 implements a dual-threshold window watchdog timer that asserts RESET when WDI falling edges occur either faster than tWD1 (fast fault) or slower than tWD2 (slow fault), with tWD1 selectable via SET0/SET1 pinstrapping (8×, 16×, or 64× ratio). Unlike MAX6746–MAX6751, it omits WDS and includes SET0/SET1 instead of MR, confirming its role as a dedicated windowed watchdog variant.
It monitors only VCC (not RESET IN), uses SRT for capacitor-adjusted reset timeout (tRP = 5.06 × 10⁶ × CSRT), and relies on internal ramp comparators (VRAMP = 1.235V ±2%) for both SRT and SWT timing. The push-pull RESET output guarantees valid logic down to VCC ≥ 1V, with VOL ≤ 0.4V at ISINK = 3.2mA and VOH ≥ 0.8 × VCC at ISOURCE = 800µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.625V ±2% (factory-trimmed suffix "46" per Table 2); ensures reliable reset assertion during 5V system brownout. |
| Supply Current | 3.7µA (typ at VCC ≤ 2.0V); enables ultra-low-power operation in always-on automotive subsystems. |
| Slow Watchdog Timeout (tWD2) | 971.5ms (typ at CSWT = 1500pF); sets upper bound for processor activity window in safety-critical firmware loops. |
| Fast Watchdog Timeout (tWD1) | 60.71ms (typ at CSWT = 1500pF, SET0=LOW/SET1=HIGH for 16× ratio); defines minimum inter-pulse interval to prevent false fast-fault resets. |
| Reset Timeout (tRP) | 7.590ms (typ at CSRT = 1500pF); provides sufficient hold time for µP initialization after power stabilization. |
| Operating Temperature | -40°C to +125°C (automotive grade); validated for under-hood ECU deployment without derating. |
| RESET Output Type | Push-pull active-low; eliminates external pull-up resistor, simplifies interface to 3.3V/5V µP reset inputs. |
Pinout & Package
MAX6753KA46 is housed in an 8-pin SOT23-8 package (JEDEC MO-178AA), with 1.0mm pitch, 2.9mm × 1.6mm footprint, and 1.1mm max height - compatible with standard high-volume automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SET0 | Watchdog window ratio select (logic input) | Configures tWD1/tWD2 ratio: LOW/HIGH = 16×; used with SET1 to disable or scale fast-fault sensitivity. |
| 2 - SET1 | Watchdog window ratio select (logic input) | Paired with SET0 to define 8×, 16×, or 64× tWD2/tWD1 ratio; HIGH/LOW disables watchdog entirely. |
| 3 - GND | Ground reference | Return path for internal comparators and RESET driver; must be low-impedance for transient immunity. |
| 4 - VCC | Supply voltage input | Power source and monitored rail; supports 1.2V–5.5V operation; RESET valid down to VCC = 1V. |
| 5 - RESET | Active-low reset output | Push-pull driver asserts low for tRP after fault; drives µP reset pin directly without external components. |
| 6 - SWT | Slow watchdog timeout capacitor input | Connects to ground via CSWT (e.g., 1500pF ceramic); sets tWD2 = 0.65 × 10⁹ × CSWT (seconds). |
| 7 - SRT | Reset timeout capacitor input | Connects to ground via CSRT (e.g., 1500pF ceramic); sets tRP = 5.06 × 10⁶ × CSRT (seconds). |
| 8 - WDI | Watchdog input | Falling-edge-triggered; pulses must fall within tWD1–tWD2 window to avoid RESET assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Window watchdog timer | Detects both fast faults (WDI pulses too frequent) and slow faults (WDI pulses too infrequent), eliminating single-threshold blind spots in firmware execution. |
| Capacitor-adjustable timeouts | Independent tuning of reset (SRT) and slow watchdog (SWT) periods using low-leakage ceramic capacitors - no trimming resistors or programming required. |
| Factory-trimmed VCC threshold | 4.625V ±2% accuracy over -40°C to +125°C ensures consistent brownout detection without calibration. |
| Automotive temperature range | Full parametric validation at -40°C and +125°C enables drop-in use in engine control, transmission, and ADAS modules. |
| Ultra-low supply current | 3.7µA typical at VCC ≤ 2.0V reduces standby power in battery-backed systems and extends ECU sleep-mode duration. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Monitors 5V supply and validates real-time firmware execution in gasoline/diesel engine management systems. IC Role / Device Role / Timing Role: Window watchdog enforces strict timing bounds on main control loop; asserts RESET if sensor sampling or actuator update stalls or races. Use Value: Prevents undetected runaway code that could cause uncommanded throttle or fuel delivery - meeting ISO 26262 ASIL-B requirements. |
Use Scenario: Supervises vision processor power and software heartbeat in lane-departure warning or automatic emergency braking modules. IC Role / Device Role / Timing Role: Uses tWD1 = 60.71ms and tWD2 = 971.5ms to validate frame-processing intervals between camera capture and neural network inference. Use Value: Detects both pipeline lockup (slow fault) and interrupt storm-induced jitter (fast fault), ensuring deterministic response to collision events. |
| Body Control Module (BCM) | Electric Power Steering (EPS) |
|
Use Scenario: Provides fail-safe reset for LIN gateway microcontrollers managing door locks, lighting, and climate functions. IC Role / Device Role / Timing Role: Factory-set 4.625V threshold guards against 5V rail collapse during load-dump transients; push-pull RESET drives µP without pull-up. Use Value: Eliminates need for external RC network and level shifter, reducing BOM count and PCB area in space-constrained BCM designs. |
Use Scenario: Ensures torque-control MCU remains responsive during high-current motor commutation cycles. IC Role / Device Role / Timing Role: SRT-configured 7.59ms reset timeout accommodates slow-ramping 12V-to-5V LDO startup; window watchdog validates motor position loop timing. Use Value: Guarantees immediate shutdown on missed CAN message deadlines or ADC sampling errors - critical for functional safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar window watchdog supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6752KA46 | Same 4.625V threshold and SOT23-8 package, but SET0/SET1 pins configured for 8× tWD2/tWD1 ratio (tWD1 = 121.43ms typ vs. 60.71ms); no manual reset option. | Preferred where wider fast-fault window reduces susceptibility to clock jitter in lower-speed MCUs. | Select MAX6752KA46 if tWD1 > 100ms suffices; choose MAX6753KA46 for tighter fault detection in high-frequency control loops. |
| TLV809E46DBZR | Single-threshold 4.63V supervisor (no watchdog), SOT23-3 package, 1.8µA ICC, but lacks windowed timing or capacitor adjustment. | Suitable only for basic power-monitoring; cannot replace MAX6753KA46 in watchdog-critical systems. | Use TLV809E46DBZR only for cost-sensitive non-safety applications requiring reset-only functionality with minimal footprint. |
Compared with MAX6752KA46 and TLV809E46DBZR, the MAX6753KA46 uniquely delivers 16× window ratio for precise fast-fault detection in high-speed automotive MCUs, while maintaining full pin compatibility with other MAX675x variants - enabling design reuse across ECU families without layout changes.
Availability
MAX6753KA46 is available at Aetrix Electronics and suitable for engine control units, ADAS processors, body control modules, and electric power steering systems requiring stable component supply across extended automotive temperature ranges and long production lifecycles.
Supply support for MAX6753KA46 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 communications markets, with emphasis on reliability, low power, and high integration.
The MAX6746–MAX6753 family targets automotive microprocessor supervision, delivering factory-trimmed thresholds, capacitor-adjustable timing, and window watchdog functionality to meet ASIL-B functional safety requirements in harsh environments.
FAQ
What is the exact reset threshold voltage of MAX6753KA46?
The MAX6753KA46 has a factory-trimmed VCC reset threshold of 4.625V ±2%, as defined by the "46" suffix in Table 2 of the Maxim datasheet (19-2530 Rev 3). This value is guaranteed over -40°C to +125°C and applies specifically to the VCC supply monitor - the device does not support adjustable RESET IN monitoring.
How do I configure the window watchdog timeout periods for MAX6753KA46?
Configure the slow watchdog period (tWD2) by connecting a capacitor (CSWT) between pin 6 (SWT) and GND; tWD2 = 0.65 × 10⁹ × CSWT seconds. Set the fast watchdog period (tWD1) using SET0 and SET1 pinstraps: for 16× ratio (tWD1 = tWD2/16), tie SET0 LOW and SET1 HIGH. The MAX6753KA46 datasheet specifies tWD2 = 971.5ms and tWD1 = 60.71ms at CSWT = 1500pF.
Does MAX6753KA46 support manual reset functionality?
No, the MAX6753KA46 does not include a manual reset (MR) input. Its pinout replaces MR with SET0/SET1 for window watchdog configuration. Manual reset capability is present only in MAX6746/MAX6747 variants. For systems requiring MR, consider MAX6751KA46 (dual-voltage monitor with MR) or redesign to use WDI-based reset initiation.
What is the recommended capacitor type for SRT and SWT on MAX6753KA46?
Use low-leakage ceramic capacitors (≤10nA leakage) for both SRT (pin 7) and SWT (pin 6) connections. X7R or C0G dielectrics are preferred for stability across temperature and bias. Avoid electrolytic or tantalum types due to leakage-induced timing drift; 100pF–1500pF values cover typical tRP and tWD2 ranges per the MAX6753KA46 timing equations.
Can MAX6753KA46 monitor a secondary voltage like RESET IN?
No, the MAX6753KA46 monitors only the VCC supply voltage and does not provide the RESET IN input found on MAX6748–MAX6751. Its pinout omits RESET IN and instead includes SET0/SET1 for window watchdog control. To monitor dual rails, select MAX6750KA46 or MAX6751KA46, which combine factory-trimmed VCC threshold with adjustable RESET IN monitoring.
MAX6753KA46 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:
- 4.625V
- 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
MAX6753KA46 FAQ
1.How can I place an order for MAX6753KA46 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6753KA46 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 MAX6753KA46 reliable?
The price and inventory of MAX6753KA46 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6753KA46 is usually 5 days.
3.What payment methods are accepted for MAX6753KA46?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6753KA46 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6753KA46?
MAX6753KA46 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6753KA46 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 MAX6753KA46?
For technical support, including MAX6753KA46 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6753KA46 requirements.
6.How does Aetrix verify that MAX6753KA46 is sourced from the original manufacturer or authorized distributors?
All MAX6753KA46 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 MAX6753KA46 meets industry standards.
7.What is the process for return or replacement of MAX6753KA46?
All MAX6753KA46 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6753KA46, 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 MAX6753KA46 part is unused and in its original packaging.
Return procedure for MAX6753KA46:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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