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Analog Devices Inc./Maxim Integrated MAX6753KA31/V+T
- Part No.:
- MAX6753KA31/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6753KA31/V+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,500
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Product details
Overview
MAX6753KA31/V+T from Analog Devices is a window watchdog supervisory IC for automotive-grade microprocessor monitoring, featuring factory-trimmed 3.075V VCC reset threshold (±2%), adjustable slow/fast watchdog timeout via external capacitor and pin-strapped ratio (8×/16×/64×), push-pull active-low RESET output, and guaranteed operation from -40°C to +125°C. It asserts reset on VCC brownout, manual reset, or windowed watchdog fault - used in engine control units and ADAS domain controllers.
For engineers reviewing the MAX6753KA31/V+T datasheet, MAX6753KA31/V+T pinout, MAX6753KA31/V+T application, or MAX6753KA31/V+T equivalent, key selection criteria include its AEC-Q100 qualification, dual-mode watchdog timing (tWD1 = 151.8ms / tWD2 = 971.5ms at CSWT = 1500pF), 3.7µA supply current at 2.0V, ±2% reset threshold accuracy over temperature, and SOT23-8 package compatibility with space-constrained automotive PCBs.
Technical Context
The MAX6753KA31/V+T implements a min/max (window) watchdog architecture: it monitors WDI falling edges against two independent timeouts - fast fault detection (tWD1) and slow fault detection (tWD2) - both derived from CSWT and configured via SET0/SET1 pins. Unlike standard watchdogs, it detects processor lockup *and* runaway execution by rejecting pulses arriving too early or too late.
Its fixed 3.075V VCC reset threshold is factory-trimmed to ±2% over -40°C to +125°C, with hysteresis of 0.8% VCC. The RESET output remains asserted for a capacitor-adjustable timeout (tRP = 4.94×10⁶ × CSRT) after all reset conditions clear, and is guaranteed valid down to VCC ≥ 1.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 3.075V ±2% (factory-trimmed, supports reliable brownout detection at nominal 3.3V rail) |
| Supply Current | 3.7µA at VCC ≤ 2.0V (enables ultra-low-power battery backup operation) |
| Operating Temperature | -40°C to +125°C (AEC-Q100 qualified for under-hood automotive use) |
| Reset Timeout Range | 0.506ms to 9.487ms (set by 100pF–1500pF capacitor on SRT pin) |
| Slow Watchdog Period | 728.6ms to 1214.4ms (CSWT = 1500pF; defines upper fault boundary) |
| Fast Watchdog Period | 11.38ms to 151.8ms (selectable 8×/16×/64× ratio vs. tWD2; defines lower fault boundary) |
| RESET Output Type | Push-pull active-low (drives µP reset directly without external pull-up) |
Pinout & Package
MAX6753KA31/V+T is housed in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176), RoHS-compliant, with 0.65mm pitch and thermal resistance qJA = 196°C/W on four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET IN | Adjustable reset comparator input | High-impedance node for external resistor-divider monitoring of secondary voltage rail (e.g., 1.2V core) |
| 2: SET1 | Watchdog window ratio select | Logic input (GND/VCC) setting tWD1/tWD2 ratio: low/high = 64×, high/low = disabled |
| 3: SWT | Slow watchdog timeout capacitor input | Connects to ground via CSWT (100pF–1500pF) to set tWD2 = 0.65×10⁹ × CSWT |
| 4: SRT | Reset timeout capacitor input | Connects to ground via CSRT (100pF–1500pF) to set tRP = 4.94×10⁶ × CSRT |
| 5: GND | Ground reference | Primary return path for internal comparators, timers, and RESET driver |
| 6: SET0 | Watchdog window ratio select | Logic input (GND/VCC) setting tWD1/tWD2 ratio: low/low = 8×, low/high = 16× |
| 7: RESET | Active-low reset output | Push-pull driver capable of sinking 3.2mA at VCC ≥ 4.5V; directly interfaces µP reset pin |
| 8: VCC | Main supply input | Power source (1.2V–5.5V) and monitored rail for fixed 3.075V threshold detection |
Key Features
| Feature | Design Value |
|---|---|
| Window watchdog timer | Detects both fast (tWDI < tWD1) and slow (tWDI > tWD2) processor faults - critical for safety-critical automotive firmware validation |
| AEC-Q100 Grade 0 qualification | Validated for -40°C to +125°C operation with full parametric guarantees - meets automotive ECU environmental requirements |
| Capacitor-adjustable timing | Independent tuning of reset timeout (SRT) and slow watchdog period (SWT) enables precise alignment with µP boot and task cycles |
| Low 3.7µA supply current | Minimizes load on backup power rails during extended vehicle sleep modes (e.g., CAN wake-up monitoring) |
| Guaranteed RESET validity down to VCC = 1.0V | Ensures deterministic reset assertion during deep brownout - prevents undefined µP state during battery sag |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Domain Controller |
|---|---|
Use Scenario: Real-time monitoring of dual-core MCU during cold cranking, where battery voltage dips to 6V with high ripple. IC Role / Device Role / Timing Role: Window watchdog enforces strict instruction timing; fixed 3.075V VCC monitor detects brownout; RESET output holds MCU in reset until stable 3.3V rail is confirmed. Use Value: Prevents unsafe actuator commands due to MCU lockup or voltage-induced bit flips - satisfies ASIL-B functional safety requirements. |
Use Scenario: Supervision of radar SoC during vehicle ignition sequence, requiring synchronized reset across multiple voltage domains. IC Role / Device Role / Timing Role: RESET output drives SoC reset pin; RESET IN monitors 1.2V core rail via external divider; tWD1/tWD2 tuned to match radar firmware heartbeat interval. Use Value: Eliminates need for discrete RC reset + separate watchdog IC - reduces BOM count and PCB area in compact ADAS module. |
| Automotive Infotainment Head Unit | Electric Power Steering (EPS) Control Module |
Use Scenario: Power sequencing during vehicle start-stop cycle, where 5V USB rail and 3.3V logic rail ramp at different rates. IC Role / Device Role / Timing Role: Dual monitoring: VCC (3.3V) and RESET IN (5V via divider); capacitor-adjusted tRP ensures reset deassertion only after both rails stabilize. Use Value: Avoids display artifacts or audio glitches caused by premature SoC release - improves perceived system robustness. |
Use Scenario: Continuous supervision of torque-control MCU during dynamic steering maneuvers, where EMI may corrupt watchdog pulses. IC Role / Device Role / Timing Role: Window watchdog rejects narrow noise spikes on WDI while detecting sustained loss of communication with motor controller. Use Value: Enables fail-operational behavior: if watchdog faults, EPS enters safe torque reduction mode instead of complete shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6752KA32/V+T | Identical pinout and window watchdog architecture, but fixed 3.200V reset threshold (±2%) and tighter hysteresis (0.65–0.90%) | Better suited for systems with nominal 3.3V rail requiring higher reset margin against ripple | Select MAX6752KA32/V+T when design requires 3.2V threshold instead of 3.075V; otherwise, MAX6753KA31/V+T provides optimal margin for 3.0V–3.3V rails. |
| TLV809E30DBZR | Single-voltage supervisor only (3.0V fixed threshold), no watchdog, SOT23-3 package, 1.6µA ICC | Lacks window watchdog and dual-rail monitoring - suitable only for basic reset-only applications | Choose TLV809E30DBZR only for cost-sensitive non-safety designs where watchdog functionality is handled externally or omitted. |
Compared with MAX6752KA32/V+T and TLV809E30DBZR, the MAX6753KA31/V+T uniquely balances AEC-Q100 compliance, window watchdog precision, and 3.075V reset threshold - making it the optimal choice for automotive ECUs requiring both brownout immunity and runtime fault detection.
Availability
MAX6753KA31/V+T is available at Aetrix Electronics and suitable for automotive engine control, ADAS domain controllers, infotainment head units, and electric power steering modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6753KA31/V+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 semiconductors, serving automotive, industrial, communications, and healthcare markets with precision timing, power management, and sensor solutions.
The MAX6746–MAX6753 family was designed specifically for automotive and industrial microprocessor supervision, delivering AEC-Q100-qualified, low-power, capacitor-adjustable reset and window watchdog functionality in space-constrained SOT23 packages.
FAQ
What is the exact reset threshold voltage of the MAX6753KA31/V+T?
The MAX6753KA31/V+T features a factory-trimmed VCC reset threshold of 3.075V, with guaranteed tolerance of ±2% over the full automotive temperature range (-40°C to +125°C). This value is defined by the "31" suffix in the part number per Table 2 of the datasheet and is not user-adjustable.
Does the MAX6753KA31/V+T support dual-voltage monitoring?
Yes - the MAX6753KA31/V+T monitors VCC using its fixed 3.075V threshold and supports secondary voltage monitoring via the RESET IN pin. When an external resistor divider is connected to RESET IN, the device detects drops below 1.235V (typical), enabling supervision of a second rail such as a 1.2V core supply.
How is the window watchdog timeout configured on the MAX6753KA31/V+T?
The MAX6753KA31/V+T uses two independent timeouts: slow watchdog period (tWD2) set by capacitor CSWT on the SWT pin (tWD2 = 0.65×10⁹ × CSWT), and fast watchdog period (tWD1) selected via SET0/SET1 pin strapping (8×, 16×, or 64× ratio relative to tWD2). No external resistor network is required.
Is the MAX6753KA31/V+T pin-compatible with other devices in the MAX6746–MAX6753 family?
Yes - the MAX6753KA31/V+T shares identical SOT23-8 pinout and footprint with all members of the MAX6746–MAX6753 family, including MAX6752, MAX6751, and MAX6748. However, function differs: MAX6753 implements window watchdog (SET0/SET1), while MAX6751 uses WDS for extended-mode watchdog.
What is the minimum VCC required for valid RESET assertion on the MAX6753KA31/V+T?
The MAX6753KA31/V+T guarantees correct RESET logic state for VCC ≥ 1.0V. Below this level, RESET output behavior is not specified. For applications requiring valid reset down to 0V, a 100kΩ pulldown resistor must be added between RESET and GND - applicable only to push-pull variants like MAX6753KA31/V+T.
MAX6753KA31/V+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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.075V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6753KA31/V+T FAQ
1.How can I place an order for MAX6753KA31/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6753KA31/V+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 MAX6753KA31/V+T reliable?
The price and inventory of MAX6753KA31/V+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6753KA31/V+T is usually 5 days.
3.What payment methods are accepted for MAX6753KA31/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6753KA31/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6753KA31/V+T?
MAX6753KA31/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6753KA31/V+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 MAX6753KA31/V+T?
For technical support, including MAX6753KA31/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6753KA31/V+T requirements.
6.How does Aetrix verify that MAX6753KA31/V+T is sourced from the original manufacturer or authorized distributors?
All MAX6753KA31/V+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 MAX6753KA31/V+T meets industry standards.
7.What is the process for return or replacement of MAX6753KA31/V+T?
All MAX6753KA31/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6753KA31/V+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 MAX6753KA31/V+T part is unused and in its original packaging.
Return procedure for MAX6753KA31/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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