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Analog Devices Inc./Maxim Integrated MAX6374KA
- Part No.:
- MAX6374KA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6374KA.pdf
- Description:
- IC SUPERVISOR PIN SELEC WATCHDOG
- Quantity:
- Payment:
- Shipping:
Inventory:3,615
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Product details
Overview
MAX6374KA from Maxim Integrated is a pin-selectable watchdog timer supervisor IC designed to monitor microprocessor activity in safety-critical embedded systems. It features push-pull active-low watchdog output with 1ms pulse width, selectable startup delay (200µs to 60s or first-edge mode), and selectable timeout period (30µs to 10s), operating from +2.5V to +5.5V supply. Used in automotive ECUs to detect firmware hangs and trigger safe-state recovery.
For engineers reviewing the MAX6374KA datasheet, MAX6374KA pinout, MAX6374KA application, or MAX6374KA equivalent, key selection criteria include its 1ms push-pull WDO pulse, first-edge startup option, 8µA quiescent current, SOT23-8 package compatibility, and ability to reconfigure timing without power cycling.
Technical Context
The MAX6374KA implements a precision analog/digital hybrid watchdog timer with three logic-controlled SET pins (SET0–SET2) that configure both startup delay and timeout period independently. Its internal transition detector validates rising/falling edges on WDI ≥100ns wide, ignoring inputs during 300µs setup time after power-up or setting changes.
Unlike fixed-timing supervisors, the MAX6374KA supports runtime reconfiguration: timing parameters can be updated mid-operation, triggering a new startup phase after tSETUP. In first-edge mode (SET2=1, SET1=0, SET0=1 or SET2=1, SET1=1, SET0=0), the watchdog remains inactive until the first valid WDI edge, eliminating fixed initialization windows.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +5.5V - supports direct interface with 3.3V and 5V µP I/O without level shifting |
| Supply Current | 8µA typical - enables always-on monitoring in battery-backed or low-power industrial controllers |
| WDO Output Type | Push-pull active-low - drives reset lines directly without external pull-up resistor |
| WDO Pulse Width | 1ms minimum - ensures reliable µP reset assertion across voltage and temperature ranges |
| Startup Delay Options | 200µs to 60s or first-edge detection - accommodates fast-boot MCUs or systems requiring >60s initialization |
| Watchdog Timeout Range | 30µs to 10s - matches tight-loop real-time firmware or long-cycle supervisory tasks |
| WDI Input Pulse Width | ≥100ns - tolerates fast µP GPIO toggling without false clearing |
Pinout & Package
MAX6374KA is housed in an 8-pin SOT23-8 package (top mark AADH), with 0.65mm pitch, 2.9mm × 1.6mm footprint, and thermal pad omitted. Pin 3 is NC and must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - WDI | Watchdog Input | Edge-sensitive input; clears internal timer on rising/falling transition ≥100ns - used to signal µP health |
| 2 - GND | Ground Reference | Primary return path for VCC and WDO; requires low-impedance connection to system ground plane |
| 3 - N.C. | No Connection | Internally unconnected; must be left floating - no trace or solder mask should contact this pad |
| 4 - SET0 | Timing Configuration Bit 0 | Logic input defining startup delay and timeout period per Table 1 - hardwired to VCC or GND for static configuration |
| 5 - SET1 | Timing Configuration Bit 1 | Second bit of 3-bit timing select code - enables eight discrete timeout combinations without external components |
| 6 - SET2 | Timing Configuration Bit 2 | MSB of timing select code - determines whether startup uses fixed delay or first-edge activation |
| 7 - WDO | Watchdog Output | Push-pull active-low output - sinks current during fault; asserts for ≥1ms to guarantee µP reset latch engagement |
| 8 - VCC | Power Supply | +2.5V to +5.5V input - requires local 0.1µF bypass capacitor placed ≤0.2 inches from pin per noise immunity spec |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable startup delay & timeout | Eight timing combinations via SET0–SET2 logic levels - eliminates need for external RC networks or firmware calibration |
| First-edge startup mode | Enables watchdog activation only after first WDI transition - supports systems with unpredictable boot duration up to hours |
| Runtime timing reconfiguration | SET pin states can be changed while powered - new timing takes effect after 300µs setup, avoiding system reset |
| Push-pull 1ms WDO output | Drives reset lines directly - removes external pull-up resistor, reducing BOM count and PCB area in space-constrained modules |
| 8µA supply current | Enables continuous supervision in energy-harvesting or coin-cell-powered nodes - extends maintenance intervals in remote sensors |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Safety Monitor |
|---|---|
Use Scenario: Monitors main MCU in diesel engine ECU during cold-start sequences where boot time exceeds 30 seconds. IC Role / Device Role / Timing Role: Watchdog supervisor providing first-edge startup activation and 10s timeout - waits for first WDI edge post-power-up, then enforces strict loop timing. Use Value: Prevents undetected firmware lockup during extended initialization, ensuring fail-safe shutdown before fuel injection misfire occurs. | Use Scenario: Supervises safety-critical motion controller in CNC machine where µP must respond to emergency stop within 100ms. IC Role / Device Role / Timing Role: Real-time watchdog with 30µs minimum timeout - detects instruction-level hangs in servo control loops running at 20kHz. Use Value: Guarantees sub-millisecond fault response by asserting 1ms push-pull WDO pulse directly to FPGA reset pin, bypassing optocoupler delays. |
| Railway Signaling Controller | Medical Infusion Pump MCU |
Use Scenario: Ensures deterministic behavior of dual-redundant ARM Cortex-M7 in wayside signaling cabinet operating at -40°C to +85°C. IC Role / Device Role / Timing Role: High-reliability supervisor with 60s startup delay and 1s timeout - accommodates full self-test sequence before enabling track-side outputs. Use Value: Meets EN 50129 SIL-3 requirements by providing independent hardware-based timing verification separate from software watchdog. | Use Scenario: Guards infusion pump's primary PIC MCU against stack corruption during motor driver interrupt handling. IC Role / Device Role / Timing Role: Low-power watchdog with 8µA ICC and 3ms timeout - operates continuously from AA batteries while enforcing critical drug-delivery timing. Use Value: Extends battery life to 12 months while guaranteeing pump halt within 5ms of missed WDI toggle, satisfying IEC 62304 Class C compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar watchdog supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6372KA-T | Same SOT23-8 package and push-pull 1ms WDO, but fixed 60s startup delay and 1ms–60s timeout range | Lacks first-edge mode and sub-millisecond timeout options - unsuitable for fast-boot or ultra-low-latency systems | Select when startup timing is predictable and ≥60s; avoids complexity of edge-triggered configuration |
| TPS3808G33DBVR | Fixed 3.3V-only supply, 200ms min timeout, open-drain WDO requiring pull-up - no pin-selectable timing or first-edge mode | Designed for generic µP reset, not safety-critical timing supervision - lacks configurable startup delay | Choose for cost-sensitive non-safety applications where timing flexibility is unnecessary and 3.3V supply is guaranteed |
Compared with MAX6372KA-T and TPS3808G33DBVR, the MAX6374KA uniquely supports runtime-reconfigurable timing with first-edge activation and 30µs minimum timeout - essential for medical and transportation systems requiring adaptive, deterministic fault response.
Availability
MAX6374KA is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, railway signaling controllers, and medical infusion pumps requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6374KA 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, mixed-signal, and high-reliability ICs for demanding industrial, automotive, and medical applications.
The MAX6369–MAX6374 family was engineered specifically for fail-safe microprocessor supervision in safety-critical systems - delivering configurable timing, low power, and robust noise immunity in miniature packages.
FAQ
What is the minimum watchdog timeout period supported by the MAX6374KA?
The MAX6374KA supports a minimum watchdog timeout period of 30µs when configured with SET2=1, SET1=0, SET0=0. This value is specified under worst-case conditions (TA = -40°C to +85°C, VCC = +2.5V to +5.5V) and enables detection of extremely fast firmware execution failures in real-time control loops. The MAX6374KA achieves this using precision internal timing circuitry without external components.
Does the MAX6374KA require an external pull-up resistor on the WDO pin?
No, the MAX6374KA does not require an external pull-up resistor on the WDO pin because it features a push-pull output stage. Unlike open-drain watchdogs such as the MAX6369KA, the MAX6374KA actively drives WDO high when deasserted and low when asserted - simplifying schematic design and reducing bill-of-materials count. This push-pull architecture is confirmed in the Electrical Characteristics table and Pin Description section of the MAX6374KA datasheet.
How does the first-edge startup mode work on the MAX6374KA?
The first-edge startup mode on the MAX6374KA (enabled by SET2=1, SET1=0, SET0=1 or SET2=1, SET1=1, SET0=0) disables the fixed startup delay timer and instead initiates watchdog supervision only upon detection of the first valid rising or falling edge on the WDI pin. This allows indefinite system initialization periods - critical for applications like railway signaling where boot sequences may exceed 60 seconds. The MAX6374KA ignores all WDI transitions until this first edge is captured, then begins normal timeout counting.
Can the timing configuration of the MAX6374KA be changed during normal operation?
Yes, the MAX6374KA supports runtime timing reconfiguration: changing the logic states of SET0, SET1, or SET2 pins while powered causes the device to enter a 300µs internal setup period (tSETUP), after which the new timing parameters become active. During tSETUP, WDI transitions are ignored. If WDO is asserted when settings change, the current pulse completes before the new startup phase begins. This capability allows dynamic adaptation to different firmware modes without power cycling - a feature explicitly documented for the MAX6374KA in the Applications Information section.
What is the maximum supply voltage rating for the MAX6374KA?
The MAX6374KA has an absolute maximum supply voltage rating of +6V on the VCC pin, as specified in the Absolute Maximum Ratings table. However, its functional operating range is strictly +2.5V to +5.5V - operation outside this range may cause undefined behavior or damage. The +6V limit provides margin against transient overvoltage events but does not permit sustained operation above +5.5V. This specification applies exclusively to the MAX6374KA and is verified across its full -40°C to +85°C temperature range.
MAX6374KA 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:
- Watchdog Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6374KA FAQ
1.How can I place an order for MAX6374KA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6374KA 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 MAX6374KA reliable?
The price and inventory of MAX6374KA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6374KA is usually 5 days.
3.What payment methods are accepted for MAX6374KA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6374KA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6374KA?
MAX6374KA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6374KA 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 MAX6374KA?
For technical support, including MAX6374KA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6374KA requirements.
6.How does Aetrix verify that MAX6374KA is sourced from the original manufacturer or authorized distributors?
All MAX6374KA 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 MAX6374KA meets industry standards.
7.What is the process for return or replacement of MAX6374KA?
All MAX6374KA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6374KA, 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 MAX6374KA part is unused and in its original packaging.
Return procedure for MAX6374KA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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