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Monolithic Power Systems Inc. MPQ6411GS-Z
- Part No.:
- MPQ6411GS-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MPQ6411GS-Z.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,439
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Product details
Overview
MPQ6411GS-Z from Monolithic Power Systems is a windowed watchdog timer IC designed for automotive and industrial microcontroller supervision. It delivers programmable short/long window modes (t2/t3 = 15/10 cycles or t4/t5 = 1500/1000 cycles at RTIMER = 51kΩ), power-on reset with 4.6V (±0.2V) threshold, and AEC-Q100 Grade 1 qualification. Its SOIC-8 package supports 5V supply operation and integrates /WD_DIS disable control.
For engineers reviewing the MPQ6411GS-Z datasheet, MPQ6411GS-Z pinout, MPQ6411GS-Z application, or MPQ6411GS-Z equivalent, key selection criteria include window timing granularity, POR threshold stability across -40°C to +125°C, WDO open-drain vs. inverter output configuration, and MODE pin logic level compatibility with 3.3V/5V MCU systems.
Technical Context
The MPQ6411GS-Z implements a state-machine-based windowed watchdog with two distinct timing windows per mode-short mode (15-cycle close / 10-cycle open) and long mode (1500-cycle close / 1000-cycle open)-both derived from an external RTIMER resistor. Its WDO output behaves as an inverter (not open-drain), eliminating need for external pull-up when interfacing with 5V MCUs.
Power-on reset is triggered at VCC ≥ 4.6V (rising) and released at VCC ≤ 4.5V (falling); under-voltage detection uses identical thresholds. The /WD_DIS pin features weak internal pull-up, enabling default watchdog activation when left floating, while MODE pin selects window length with internal pull-up ensuring defined startup behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5V ±10% - matches standard automotive MCU rails; no LDO required |
| POR Threshold | 4.6V ±0.2V - ensures reliable MCU reset before core logic powers up |
| Quiescent Current | 19µA typ. at RTIMER=100kΩ - enables low-power system monitoring without battery drain |
| Window Timing | Short mode: 15/10 cycles; Long mode: 1500/1000 cycles - provides fine-grained or extended fault detection coverage |
| WDO Output Type | Inverter output - directly drives 5V MCU reset pin without external pull-up resistor |
| Operating Temp | -40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood automotive use |
| Package | SOIC-8 - industry-standard footprint compatible with automated PCB assembly |
Pinout & Package
MPQ6411GS-Z is housed in a standard SOIC-8 package (JEDEC MS-012 AA), with 1.27mm pitch, 3.9mm body width, and 4.9mm body length. Pin 1 is marked by a beveled corner or dot; thermal resistance θJA = 96°C/W on 4-layer PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 WDO | Watchdog reset output | Inverter-type output; actively drives low during reset; no external pull-up needed for 5V MCU interface |
| 2 WDI | Watchdog trigger input | Accepts MCU-generated sync pulses; detects missing or out-of-window triggers to initiate reset |
| 3 MODE | Window mode select | Pull high for long window (1500/1000 cycles); pull low for short window (15/10 cycles); internal pull-up ensures defined boot state |
| 4 GND | Ground reference | System ground return path for all internal circuits and reset signaling |
| 5 NC | No connect | Internally unconnected; must remain unconnected on PCB |
| 6 VCC | Power supply input | 5V ±10% input; powers internal logic, POR circuitry, and timing oscillator |
| 7 TIMER | Timing resistor connection | Connects external RTIMER (e.g., 51kΩ) to set base timing period (T ≈ 880µs) |
| 8 /WD_DIS | Watchdog enable/disable | Pull low to disable watchdog; internal pull-up enables default active operation when left floating |
Key Features
| Feature | Design Value |
|---|---|
| Programmable window mode | MODE pin selects between short (15/10 cycle) and long (1500/1000 cycle) timing windows - enables adaptation to MCU firmware execution time variability |
| Power-on reset (POR) | Guaranteed WDO low pulse during VCC ramp-up above 4.6V - ensures deterministic MCU initialization before code execution |
| WDI error detection | Detects WDI stuck-low condition (>5ms) and holds WDO low until recovery - prevents false resets due to signal integrity issues |
| Low quiescent current | 19µA typical at RTIMER=100kΩ - minimizes impact on always-on vehicle subsystems like body control modules |
| AEC-Q100 Grade 1 | Qualified for -40°C to +125°C operation - validated for engine bay and transmission control unit environments |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Supervises real-time safety-critical firmware in gasoline/diesel engine management systems. IC Role / Device Role / Timing Role: Windowed watchdog enforcing strict timing compliance of main control loop; triggers hardware reset if MCU stalls or executes outside defined window. Use Value: Prevents undetected MCU lockup during combustion cycle control, meeting ISO 26262 ASIL-B functional safety requirements. | Use Scenario: Monitors vision-processing MCU in lane-departure warning or automatic emergency braking modules. IC Role / Device Role / Timing Role: Detects firmware hang or timing violation in multi-threaded perception stack; asserts reset within 1500 cycles (long mode) to recover sensor fusion pipeline. Use Value: Enables rapid fail-safe transition to backup control state without requiring software-level health checks. |
| Body Control Module (BCM) | Electric Power Steering (EPS) |
Use Scenario: Ensures reliable operation of door-lock, lighting, and climate MCU in passenger compartment electronics. IC Role / Device Role / Timing Role: Short-window mode (15/10 cycles) validates frequent heartbeat signals from low-latency peripherals like CAN transceivers and LIN slaves. Use Value: Delivers fast fault response (<1ms) to prevent spurious actuator activation during sleep/wake transitions. | Use Scenario: Provides fail-operational supervision for torque-control MCU in steer-by-wire systems. IC Role / Device Role / Timing Role: Dual-window enforcement ensures both high-frequency motor commutation timing and lower-frequency diagnostic task completion. Use Value: Supports redundant safety mechanisms by independently verifying timing margins of critical control loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar windowed watchdog timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.3V supply; no MODE-selectable window; only one programmable timeout (200ms–10s) | Lacks windowed architecture - cannot detect early/late MCU triggers, only absence | Select when simple timeout supervision suffices and 3.3V-only supply is guaranteed |
| MAX6373KA29+T | 5V supply; fixed window ratio (1:2); no MODE pin; POR threshold 2.93V | Lower POR threshold reduces noise immunity in noisy 12V automotive systems | Select when legacy design requires pin-for-pin replacement and window ratio flexibility is not required |
Compared with TPS3808G33DBVR and MAX6373KA29+T, MPQ6411GS-Z uniquely supports dual programmable window modes via MODE pin, higher POR threshold (4.6V) for robustness against supply ripple, and inverter-output WDO eliminating external pull-up - making it optimal for new AEC-Q100-compliant designs demanding precise timing supervision.
Availability
MPQ6411GS-Z is available at Aetrix Electronics and suitable for automotive engine control units, ADAS domain controllers, and industrial PLCs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MPQ6411GS-Z 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
Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with design centers in the US, China, and Taiwan.
The MPQ6411 belongs to MPS's automotive-grade watchdog timer product line, engineered specifically for functional safety-critical MCU supervision in AEC-Q100 environments where deterministic timing validation is mandatory.
FAQ
What is the exact POR threshold voltage and its tolerance?
The MPQ6411GS-Z asserts WDO low during power-up when VCC rises to 4.6V (typical), with guaranteed range of 4.4V to 4.8V for rising edge and 4.3V to 4.7V for falling edge. This tight 0.2V window ensures reliable reset assertion before MCU core voltage reaches operational level, preventing undefined startup states.
How does the MODE pin affect window timing, and what happens if it floats?
The MODE pin selects short window (15/10 cycles) when pulled low and long window (1500/1000 cycles) when pulled high. It features a weak internal pull-up, so an unconnected MODE pin defaults to high, enabling long-window operation at power-on - ensuring safe startup behavior without external biasing.
Is an external pull-up resistor required on the WDO pin?
No. Unlike open-drain watchdog outputs, MPQ6411GS-Z's WDO is an inverter output that actively drives low during reset and high otherwise. For 5V operation, no external pull-up is needed - simplifying schematic design and reducing BOM count compared to open-drain alternatives.
What is the maximum allowable WDI pulse width before it's classified as an error?
The MPQ6411GS-Z treats any WDI signal held low beyond 5ms as a WDI error, forcing WDO into sustained low state until WDI returns high. This protects against stuck-low conditions caused by MCU GPIO failure or EMI-induced latch-up, ensuring immediate hardware-level intervention.
Can the MPQ6411GS-Z operate with a 3.3V supply?
No. MPQ6411GS-Z is specified for 5V ±10% operation only. For 3.3V systems, the MPQ6411GS-33-Z variant must be used - it has different POR thresholds (2.9–3.1V), adjusted input logic levels, and reduced quiescent current, but shares identical pinout and functional architecture.
Does the /WD_DIS pin require external pull-up to ensure watchdog activation?
No. /WD_DIS has a weak internal pull-up, so leaving it unconnected enables the watchdog by default. Pulling /WD_DIS low disables supervision - useful during firmware updates or debug sessions. This eliminates need for external components while maintaining fail-safe default behavior.
MPQ6411GS-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Watchdog Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.6V
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MPQ6411GS-Z FAQ
1.How can I place an order for MPQ6411GS-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ6411GS-Z 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 MPQ6411GS-Z reliable?
The price and inventory of MPQ6411GS-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ6411GS-Z is usually 5 days.
3.What payment methods are accepted for MPQ6411GS-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ6411GS-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ6411GS-Z?
MPQ6411GS-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ6411GS-Z 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 MPQ6411GS-Z?
For technical support, including MPQ6411GS-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ6411GS-Z requirements.
6.How does Aetrix verify that MPQ6411GS-Z is sourced from the original manufacturer or authorized distributors?
All MPQ6411GS-Z 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 MPQ6411GS-Z meets industry standards.
7.What is the process for return or replacement of MPQ6411GS-Z?
All MPQ6411GS-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ6411GS-Z, 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 MPQ6411GS-Z part is unused and in its original packaging.
Return procedure for MPQ6411GS-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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