MAX6369KA/V+ - SOT-23-8 Pin-Selectable Watchdog Timer | ADI
Teilenummer: MAX6369KA/V+ ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $3.5 | $3,50 |
| 10 | $3.15 | $31,50 |
| 100 | $2.75 | $275,00 |
| 500 | $2.4 | $1.200,00 |
| 1.000 | $2.1 | $2.100,00 |
MAX6369KA/V+ Übersicht
A watchdog timer (WDT) is a hardware safety circuit that resets a microprocessor when its embedded firmware fails to service a periodic input within a defined window. Watchdog supervisors belong to the broader supervisor IC family (voltage supervisors, reset ICs, and sequencers) within the power management IC category. By offloading software-lockup detection from the microcontroller to a dedicated external device, designers add an independent safety net that operates even when the host CPU has halted, frozen, or branched into unintended code.
Key features include pin-selectable watchdog timeout and reset delay windows, an open-drain active-low RESET output, and a watchdog disable input that allows the host to halt supervision during sleep or debug. The MAX6369KA/V+ shares the SOT-23-8 pinout with other members of the MAX6369-MAX6374 family, which differ primarily in default timeout values and reset polarity. This family-wide pin compatibility enables a single PCB layout to be reused across multiple timeout/polarity combinations.
The device integrates a precision internal oscillator and timing logic, eliminating external RC components. The MAX6369KA/V+ uses open-drain reset architecture, which allows wired-OR connection with other supervisors in multi-rail systems. Its AEC-Q100 qualification makes it appropriate for automotive electronic control units (ECUs), body controllers, and battery management systems where component reliability across temperature extremes is required.
Typical applications include automotive ECU watchdog supervision, industrial PLC processor monitoring, medical device firmware safety, IoT edge-node supervisory circuits, and any microcontroller-based product that requires a hardware watchdog timer to detect firmware lockups.
When designing with the MAX6369KA/V+, observe the WDI pulse-width requirement and the minimum VCC ramp rate. For multi-rail systems, the open-drain output can be shared with other supervisors through a pull-up resistor to the logic-level rail. Refer to the manufacturer datasheet for the exact timing selection logic on the SET pins.
This page consolidates distributor pricing, AEC-Q100 verified specs, drop-in alternatives from the same family and competitors, and practical design notes not found on a single distributor listing.
Drop-in-Alternativen für MAX6369KA/V+ – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
MAX6374KA/V+
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX6370KA/V+
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX6371KA/V+
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX6372KA/V+
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX6373KA/V+
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX6369KA/V+ Technische Daten
| Funktion | Pin-selectable watchdog timer supervisor |
| Number of Supervisors | 1 |
| Ausgangstyp | Open-Drain or Open-Collector (Active-Low RESET) |
| Operating Voltage (VCC) | +2.5 V to +5.5 V |
| Versorgungsstrom | 8 µA (typical) |
| Watchdog Timeout | Pin-selectable (per family datasheet) |
| Reset Delay | 60 s (default for MAX6369KA/V+, pin-selectable) |
| Watchdog Disable Feature | Yes |
| External Components Required | None |
| Gehäuse | SOT-23-8 (KA) |
| Betriebstemperatur | -40°C to +125°C (AEC-Q100 automotive grade) |
| Automotive Qualification | AEC-Q100 (MAX6369KA/V+ and MAX6374KA/V+ only) |
| Montageart | Surface Mount |
| RoHS-Status | Compliant |
MAX6369KA/V+ Pin-Konfiguration
| Pin 1 | IN — Watchdog input (WDI) - host microcontroller toggles this pin to indicate firmware health |
| Pin 2 | GND — Ground |
| Pin 3 | SET0 — Timing selection input 0 (per family datasheet) |
| Pin 4 | SET1 — Timing selection input 1 (per family datasheet) |
| Pin 5 | RESET — Active-low open-drain reset output |
| Pin 6 | MR — Manual reset input or WDI disable (per family datasheet) |
| Pin 7 | VCC — Supply voltage (+2.5V to +5.5V) |
| Pin 8 | NC — Not connected (per datasheet) |
Typische Anwendungen
MAX6369KA/V+ ist geeignet für 6 Anwendungs: Automotive ECU Watchdog Supervision, Industrial PLC Processor Monitoring, Medical Device Firmware Safety, IoT Edge-Node Supervisory Circuit, Battery Management System (BMS) Supervisor, Point-of-Sale Terminal Watchdog.
Automotive ECU Watchdog Supervision
The MAX6369KA/V+ is purpose-built for automotive ECU watchdog supervision thanks to its AEC-Q100 qualification, 8 µA low supply current, and 2.5V-5.5V operating range that aligns with 3.3V and 5V microcontroller rails. Its open-drain active-low reset asserts when the host MCU stops toggling WDI within the programmed window, providing an independent hardware safety net that catches firmware lock-ups, stack overruns, and brown-out-induced code corruption in body controllers, transmission ECUs, and ADAS sensor processors. The SOT-23-8 footprint suits high-density automotive PCB layouts where board area is at a premium.
Empfohlen
Industrial PLC Processor Monitoring
In industrial PLC and DCS modules, the MAX6369KA/V+ provides a hardware watchdog layer independent of the main CPU, asserting reset when firmware fails to service the WDI input within the timeout window. The wide 2.5V-5.5V supply range tolerates 24V-to-5V downstream regulator transients common in industrial backplanes. With no external timing components, the design simplifies BOM and reduces PCB area in DIN-rail I/O modules and remote I/O gateways. The pin-selectable timing windows allow reuse across PLC product families with different firmware-cycle requirements.
Empfohlen
Medical Device Firmware Safety
Medical devices with patient-safety implications rely on external watchdog supervisors to detect firmware lock-ups that could leave a therapy or monitoring function in an unsafe state. The MAX6369KA/V+ offers an independent reset source outside the host microcontroller, asserting active-low reset if the WDI pulses cease within the configured window. Its 8 µA quiescent current supports battery-powered portable medical instruments such as infusion pumps and patient monitors. The SOT-23-8 footprint fits compact, sealed medical-device enclosures where every square millimetre counts.
Empfohlen
IoT Edge-Node Supervisory Circuit
Battery-powered IoT edge nodes benefit from the MAX6369KA/V+ 8 µA quiescent current and 2.5V-5.5V operating range, which directly accept Li-ion or 3.3V system rails. The watchdog timer catches the all-too-common condition where the wireless stack or sensor-processing firmware freezes after an OTA update failure or RF-induced MCU crash. The WDI-disable feature lets the host firmware halt supervision during deep-sleep, conserving battery life. The SOT-23-8 package supports sub-50 mm² sensor-node PCBs typical of LoRaWAN, BLE, and Zigbee designs.
Empfohlen
Battery Management System (BMS) Supervisor
In Li-ion battery management systems, the MAX6369KA/V+ supervises the main monitoring microcontroller and forces a reset if the BMS firmware stops servicing WDI within the programmed window, an essential safety function to prevent runaway charge/discharge conditions. The 2.5V-5.5V range covers single-cell Li-ion (nominally 3.7V) and 5V regulated rails. Its open-drain reset output can be wire-ORed with other supervisory signals to gate downstream FET drivers, while the SOT-23-8 package keeps the BMS footprint compact inside the battery pack enclosure.
Empfohlen
Point-of-Sale Terminal Watchdog
Point-of-sale terminals must stay available for retail transactions, and a firmware lock-up means lost revenue. The MAX6369KA/V+ adds an independent watchdog layer that resets the main application processor if the embedded OS stops toggling WDI. Its open-drain active-low reset integrates easily with the existing reset chain of the terminal's PMIC. With 8 µA supply current, the supervisory circuit adds negligible drain on the terminal's standby power budget, and the SOT-23-8 footprint fits the dense mainboard layout typical of POS terminals.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für MAX6369KA/V+ – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | MAX6374KA/V+ | MAX6370KA/V+ | MAX6371KA/V+ | MAX6372KA/V+ | MAX6373KA/V+ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) | Analog Devices (Maxim Integrated) |
| Package | SOT-23-8 (KA) | SOT-23-8 (KA) - same | SOT-23-8 (KA) - same | SOT-23-8 (KA) - same | SOT-23-8 (KA) - same | SOT-23-8 (KA) - same |
| Operating Voltage | +2.5V to +5.5V | +2.5V to +5.5V | +2.5V to +5.5V | +2.5V to +5.5V | +2.5V to +5.5V | +2.5V to +5.5V |
| Supply Current | 8 µA | 8 µA | 8 µA | 8 µA | 8 µA | 8 µA |
| Output Type | Open-Drain Active-Low | Open-Drain Active-Low | Open-Drain Active-Low | Open-Drain Active-Low | Open-Drain Active-Low | Open-Drain Active-Low |
| AEC-Q100 Qualified | Yes | Yes | No | No | No | No |
| Default Reset Delay | 60 s | Pin-selectable, different default | Pin-selectable, different default | Pin-selectable, different default | Pin-selectable, different default | Pin-selectable, different default |
| External Components | None required | None required | None required | None required | None required | None required |
Wichtigste Unterscheidungsmerkmale
- AEC-Q100 automotive qualification (vs. MAX6370KA/V+ / MAX6371KA/V+ / MAX6372KA/V+ / MAX6373KA/V+)
- 60 s default reset delay window (vs. MAX6371KA+T / MAX6373KA+)
- Zero external timing components (vs. Generic discrete watchdog (RC-timer + comparator))
Designhinweise
The MAX6369KA/V+ requires that the host microcontroller generate WDI pulses shorter than the watchdog timeout window but with a minimum pulse width per the family datasheet. Failing to service WDI promptly triggers an active-low reset. In systems where the MCU enters deep sleep and stops toggling WDI intentionally, drive the WDI-disable input high before sleep and pull it low after wake, otherwise a false reset will occur.
Place the MAX6369KA/V+ as close as practical to the host microcontroller's reset pin and VCC rail to minimize noise pickup on the WDI line. A 0.1 µF ceramic bypass capacitor should be placed within 5 mm of the VCC pin to suppress supply transients. The open-drain RESET output requires an external pull-up resistor (typically 10 kΩ to 100 kΩ) tied to the logic-level rail; size it to balance rise time against current draw.
When sharing the open-drain RESET line with other supervisor ICs, ensure that any one supervisor can pull the line low without contention. Verify that all shared supervisors have open-drain (not push-pull) outputs; mixing push-pull and open-drain on the same node can damage the push-pull driver. The pull-up voltage should not exceed the absolute maximum voltage rating of any device on the node.
Compliance-Informationen
AEC-Q100 qualified per Analog Devices MAX6369 product page. RoHS and REACH compliant per distributor listings. Halogen-free status not explicitly stated in verified data.
