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Analog Devices Inc./Maxim Integrated MAX6372KA-T
- Part No.:
- MAX6372KA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6372KA-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,721
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Product details
Overview
MAX6372KA-T from Maxim Integrated is a pin-selectable watchdog timer IC designed to supervise microprocessor activity in safety-critical embedded systems. It features push-pull active-low watchdog output with 1ms pulse width, 60s fixed startup delay, and pin-selectable timeout periods from 1ms to 60s. It operates from +2.5V to +5.5V and draws only 10–22µA over –40°C to +125°C, making it suitable for automotive and industrial controller monitoring.
For engineers reviewing the MAX6372KA-T datasheet, MAX6372KA-T pinout, MAX6372KA-T application, or MAX6372KA-T equivalent, key selection criteria include its fixed 60s startup delay, push-pull WDO output (no external pullup required), pin-selectable timeout configuration via SET0–SET2, and AEC-Q100 qualification status for automotive use.
Technical Context
The MAX6372KA-T implements a digital watchdog timer with three logic-controlled SET inputs (SET0/SET1/SET2) that configure both startup delay and timeout period. Its internal transition detector monitors rising/falling edges on WDI with ≥100ns pulse width, ignoring transitions during WDO assertion and a 300µs internal setup window after power-up or setting changes.
This device belongs to the MAX6369–MAX6374 family and uses BiCMOS process technology (1500 transistors). Unlike MAX6369/MAX6371/MAX6373, it provides push-pull WDO output-eliminating need for external pullup-and fixes startup delay at 60s while retaining full pin-selectable timeout options (1ms–60s).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +5.5V - supports wide-input industrial and automotive rails without LDO pre-regulation. |
| Supply Current | 10µA to 22µA (–40°C to +125°C) - enables always-on supervision in battery-backed or low-power systems. |
| Watchdog Output Type | Push-pull active-low - drives WDO directly without external pullup resistor; compatible with standard CMOS/TTL inputs. |
| WDO Pulse Width | 1ms minimum - provides sufficient time to trigger μP reset or interrupt without requiring external timing extension. |
| Startup Delay | Fixed 60s - ensures full system initialization before watchdog begins monitoring; eliminates risk of premature timeout during boot. |
| Watchdog Timeout Range | Pin-selectable: 1ms to 60s - eight discrete settings via SET0/SET1/SET2 logic levels enable precise match to software loop timing. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and harsh industrial environments. |
| Input Transition Detection | WDI edge-sensitive (≥100ns pulse width) - rejects noise glitches while reliably detecting valid firmware strobes. |
Pinout & Package
MAX6372KA-T is housed in an 8-pin SOT23 package (package code K8SN-1/K8SN+1), measuring 2.9mm × 1.6mm × 1.1mm, with RoHS-compliant lead-free finish indicated by "+" suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - WDI | Watchdog Input | Edge-triggered input; clears internal timer on rising or falling edge ≥100ns; must be driven or pulled to GND (≤100kΩ) if unused. |
| 2 - GND | Ground Reference | Primary return path for supply and signal currents; requires low-impedance connection to system ground plane. |
| 3 - N.C. | No Connection | Internally unconnected; must remain floating - no trace or pad connection permitted. |
| 4 - SET0 | Timing Configuration Input | Logic input (VCC/GND) selecting one of eight timeout/startup combinations; used with SET1/SET2 per Table 1. |
| 5 - SET1 | Timing Configuration Input | Second logic input for pin-selectable timing; state determines whether timeout is 1ms, 10ms, 30ms, disabled, or extended. |
| 6 - SET2 | Timing Configuration Input | Most-significant timing control bit; together with SET0/SET1, selects fixed 60s startup delay and corresponding timeout value. |
| 7 - WDO | Watchdog Output | Push-pull active-low output; sinks current when asserted; drives reset/interrupt line directly without pullup. |
| 8 - VCC | Supply Voltage Input | +2.5V to +5.5V power rail; requires local 0.1µF bypass capacitor placed ≤0.2 inches from pin per noise immunity guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 60s Startup Delay | Guarantees complete microcontroller initialization before watchdog monitoring begins - prevents false timeouts during boot sequence. |
| Push-Pull WDO Output | Eliminates need for external pullup resistor, reducing BOM count and PCB footprint while ensuring robust logic-level drive into reset circuits. |
| Pin-Selectable Timeout (1ms–60s) | Eight discrete timeout options configured via three logic inputs - enables precise alignment with firmware execution cycles without re-spinning hardware. |
| 300µS Internal Setup Time | Ensures stable operation after power-up or timing configuration changes - prevents spurious WDO assertion during state transitions. |
| AEC-Q100 Qualified | Validated for automotive applications including engine control, ADAS, and infotainment - meets stress testing requirements for temperature, humidity, and vibration. |
| No External Components Required | Self-contained timing circuitry with internal oscillator - simplifies design, improves reliability, and reduces bill-of-materials cost. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Main Controller |
|---|---|
|
Use Scenario: Monitors real-time firmware execution in diesel/gasoline ECU during cold start, idle, and acceleration phases. IC Role / Device Role / Timing Role: Watchdog supervisor asserting 1ms WDO pulse to trigger hardware reset if main loop hangs or fails to strobe WDI within selected timeout. Use Value: Prevents unsafe operating states (e.g., uncontrolled fuel injection) by enforcing deterministic recovery within 60s post-power-on and <60s thereafter. |
Use Scenario: Supervises ladder logic scan cycle in programmable logic controller managing conveyor belts, valves, and safety interlocks. IC Role / Device Role / Timing Role: Pin-configured for 10ms timeout to match typical 5–15ms scan duration; asserts WDO on missed WDI edge to initiate controlled shutdown. Use Value: Enables fail-safe response to firmware lockup without requiring software-based health checks - critical for SIL2-rated machinery control. |
| Railway Signaling Processor | Medical Infusion Pump Controller |
|
Use Scenario: Ensures continuous validation of safety-critical signaling algorithms in track-side interlocking systems operating at –40°C to +70°C ambient. IC Role / Device Role / Timing Role: Configured with 30ms timeout and fixed 60s startup delay; WDO connected to redundant reset domain to force dual-CPU re-synchronization. Use Value: Meets EN 5012x functional safety requirements by guaranteeing hardware-enforced recovery independent of software stack integrity. |
Use Scenario: Supervises motor control and dose calculation firmware in Class II infusion pumps where failure could cause overdose or underdose. IC Role / Device Role / Timing Role: Set to 100ms timeout to align with maximum allowable motor stall detection interval; WDO drives dedicated reset line isolated from main MCU power domain. Use Value: Provides IEC 62304-compliant hardware-level fault containment - stops fluid delivery within defined safety window upon detected execution anomaly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar watchdog timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6372KA/V+T | AEC-Q100 qualified version with automotive-grade screening and extended temperature test coverage; identical electrical specs and pinout. | Required for production automotive modules subject to OEM PPAP; not needed for industrial or medical prototypes. | Select MAX6372KA/V+T when automotive qualification documentation (test reports, lot traceability) is contractually mandated. |
| MAX6370KA+T | Same push-pull WDO and 1ms pulse width, but offers selectable (not fixed) 60s startup delay; shares same SOT23-8 package and SET pin interface. | Suitable when system boot time varies across configurations and startup delay must be adapted per firmware variant. | Choose MAX6370KA+T only if variable startup delay is required; MAX6372KA-T is preferred for deterministic 60s initialization guarantee. |
Compared with MAX6372KA/V+T, the MAX6372KA-T omits automotive qualification documentation but retains identical electrical behavior and thermal performance; versus MAX6370KA+T, it trades startup delay flexibility for guaranteed 60s initialization window - simplifying safety validation in fixed-boot systems.
Availability
MAX6372KA-T is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, railway signaling processors, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6372KA-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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX6369–MAX6374 family delivers pin-configurable watchdog supervision targeting safety-critical microprocessor monitoring where deterministic timing, low power, and high reliability are mandatory.
FAQ
What is the watchdog startup delay for MAX6372KA-T?
The MAX6372KA-T has a fixed 60s startup delay - meaning the internal watchdog timer does not begin counting until 60 seconds after power-up or reset, regardless of SET pin configuration. This ensures full microcontroller initialization before supervision starts, and is a defining characteristic distinguishing it from other members of the MAX6369–MAX6374 family like MAX6370KA+T.
Does MAX6372KA-T require an external pullup resistor on the WDO pin?
No, MAX6372KA-T does not require an external pullup resistor on WDO because it features a push-pull output stage. The WDO pin actively drives low during timeout assertion and high during deassertion, enabling direct connection to standard CMOS/TTL reset inputs without additional components - unlike open-drain variants such as MAX6371KA+T.
Can the watchdog timeout period of MAX6372KA-T be changed dynamically during operation?
Yes, the watchdog timeout period of MAX6372KA-T can be changed dynamically during operation by modifying the logic states of SET0, SET1, and SET2 pins. However, a 300µs internal setup time applies after each change, and WDI must be strobed immediately before the change to avoid unintended timeout assertion - as documented in the MAX6372KA-T application notes.
Is MAX6372KA-T qualified for automotive applications?
The MAX6372KA-T itself is not AEC-Q100 qualified; however, the functionally identical MAX6372KA/V+T variant is fully AEC-Q100 qualified. Both share identical electrical specifications, pinout, and thermal characteristics - the difference lies solely in manufacturing screening and documentation required for automotive production release.
What is the minimum pulse width required on the WDI input for MAX6372KA-T to recognize a valid transition?
The MAX6372KA-T requires a minimum pulse width of 100ns on the WDI input to register a valid rising or falling edge. Transitions narrower than this threshold are ignored by the internal transition detector, providing immunity to noise spikes while maintaining responsiveness to legitimate firmware strobes - a parameter confirmed in the Electrical Characteristics table of the MAX6372KA-T datasheet.
MAX6372KA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
MAX6372KA-T FAQ
1.How can I place an order for MAX6372KA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6372KA-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 MAX6372KA-T reliable?
The price and inventory of MAX6372KA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6372KA-T is usually 5 days.
3.What payment methods are accepted for MAX6372KA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6372KA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6372KA-T?
MAX6372KA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6372KA-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 MAX6372KA-T?
For technical support, including MAX6372KA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6372KA-T requirements.
6.How does Aetrix verify that MAX6372KA-T is sourced from the original manufacturer or authorized distributors?
All MAX6372KA-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 MAX6372KA-T meets industry standards.
7.What is the process for return or replacement of MAX6372KA-T?
All MAX6372KA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6372KA-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 MAX6372KA-T part is unused and in its original packaging.
Return procedure for MAX6372KA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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