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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:10,777
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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 10µA typical supply current at +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 timing, SET0–SET2 pin configuration logic, and compatibility with high-temperature industrial environments up to +125°C.
Technical Context
The MAX6372KA+T implements a digital watchdog timer with three logic-controlled SET pins (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 time after power-up or setting changes.
This device belongs to the MAX6369–MAX6374 family and uses BiCMOS process technology with 1500 transistors. Unlike MAX6369/MAX6371/MAX6373, it provides push-pull WDO output (1ms pulse), and unlike MAX6373/MAX6374, it does not support first-edge startup mode - its startup delay is fixed at 60s regardless of SET pin states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Watchdog Output Type | Push-pull, active-low - drives WDO low without external pullup, enabling direct reset/interrupt signaling. |
| WDO Pulse Width | 1ms minimum - ensures reliable system-level reset or interrupt assertion without requiring external timing components. |
| Startup Delay | Fixed 60s - provides guaranteed initialization window for complex μP boot sequences before watchdog supervision begins. |
| Watchdog Timeout Range | Pin-selectable 1ms to 60s - eight discrete timeout options via SET0/SET1/SET2 logic levels, supporting diverse software loop timing requirements. |
| Supply Voltage Range | +2.5V to +5.5V - compatible with 3.3V and 5V logic domains and tolerant of brown-out conditions down to 2.5V. |
| Supply Current | 10µA typical at +125°C - enables long-term operation in battery-backed or energy-constrained industrial monitoring applications. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and harsh industrial environments without derating. |
Pinout & Package
MAX6372KA+T is housed in an 8-pin SOT23 package (package code K8SN+1, outline 21-0078), with 0.65mm pitch and RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - WDI | Watchdog Input | Accepts rising/falling edge transitions ≥100ns wide; clears internal timer on each valid edge; ignored during WDO assertion and startup delay. |
| 2 - GND | Ground Reference | Primary return path for VCC and all internal circuitry; must be connected to system ground plane for stable timing operation. |
| 3 - N.C. | No Connection | Internally unconnected; must remain floating - no external trace or component should attach to this pin. |
| 4 - SET0 | Timing Configuration Input | Logic input (VCC/GND) selecting one of eight watchdog timeout and startup delay combinations per Table 1 in datasheet. |
| 5 - SET1 | Timing Configuration Input | Second logic input determining timing mode; combined with SET0/SET2, defines fixed 60s startup delay and selectable timeout. |
| 6 - SET2 | Timing Configuration Input | Third logic input completing 3-bit timing selection; all three SET pins must be hardwired or driven by control logic prior to operation. |
| 7 - WDO | Watchdog Output | Push-pull active-low output asserting for ≥1ms on timeout; directly interfaces with μP reset or interrupt inputs without pullup resistor. |
| 8 - VCC | Power Supply | +2.5V to +5.5V supply input; requires local 0.1µF bypass capacitor placed ≤0.2 inches from pin for noise immunity in electrically noisy environments. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable timeout with fixed 60s startup delay | Eliminates need for external RC timing networks while ensuring sufficient boot time for complex firmware initialization sequences. |
| Push-pull WDO output (1ms pulse) | Removes dependency on external pullup resistors and guarantees fast, deterministic reset/interrupt assertion across voltage and temperature ranges. |
| 300µs internal setup time after configuration change | Enables dynamic reconfiguration of watchdog timing during runtime without risk of spurious timeout pulses during transition. |
| 10µA max supply current at +125°C | Supports always-on supervision in thermally demanding applications such as motor control or automotive body electronics without thermal penalty. |
| BiCMOS process with 1500 transistors | Delivers precise timing stability over -40°C to +125°C with minimal drift, critical for functional safety compliance in industrial systems. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Main Controller |
|---|---|
|
Use Scenario: Supervises real-time firmware execution in diesel ECU during cold-start sequences where boot time exceeds 30s. IC Role / Device Role / Timing Role: Provides fixed 60s startup delay to accommodate full bootloader + kernel initialization, then enforces 100ms–1s timeout on critical control loops. Use Value: Prevents undetected lockup during extended initialization while maintaining tight supervision of post-boot software execution. |
Use Scenario: Monitors ladder logic scan cycles in DIN-rail mounted PLCs operating continuously in factory environments. IC Role / Device Role / Timing Role: Acts as independent hardware watchdog, clearing timer on each scan completion signal from PLC CPU via WDI pin. Use Value: Guarantees recovery from firmware hangs without operator intervention, meeting IEC 61131-3 reliability requirements. |
| Railway Signaling Safety Module | Medical Infusion Pump Controller |
|
Use Scenario: Embedded in SIL-2 certified signaling interface board where failure must trigger safe state within defined time budget. IC Role / Device Role / Timing Role: Generates hardware reset pulse on WDO when main controller fails to strobe WDI within selected timeout (e.g., 500ms). Use Value: Enables deterministic fail-safe response independent of software-based health checks, satisfying EN 5012x timing constraints. |
Use Scenario: Supervises closed-loop dosing algorithm in battery-powered infusion pump operating for >72 hours per charge. IC Role / Device Role / Timing Role: Uses low 10µA quiescent current and 60s startup delay to avoid false triggers during deep-sleep wake-up sequences. Use Value: Extends battery life while ensuring immediate detection of motor driver or sensor communication faults during therapy delivery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar watchdog timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6370KA+T | Same push-pull 1ms WDO output and 8-pin SOT23 package, but offers selectable startup delay (1ms–60s) instead of fixed 60s. | Suitable where system boot time varies significantly between firmware versions or configurations. | Select MAX6370KA+T if flexible startup delay is required; MAX6372KA+T is preferred when consistent 60s initialization window is mandated. |
| MAX6374KA+T | Push-pull 1ms WDO output and same package, but supports first-edge startup mode and shorter minimum timeout (30µs). | Required for ultra-fast response applications like servo drive position loop supervision. | Choose MAX6374KA+T only when sub-millisecond timeout or edge-triggered startup is essential; MAX6372KA+T provides simpler, fixed-delay operation. |
Compared with MAX6370KA+T and MAX6374KA+T, the MAX6372KA+T trades startup flexibility and ultra-short timeout capability for deterministic 60s initialization timing - ideal for systems with fixed, well-characterized boot sequences where predictability outweighs configurability.
Availability
MAX6372KA+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLCs, railway signaling modules, 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 was developed specifically for high-reliability microprocessor supervision in environments where deterministic timing, low power, and extended temperature operation are mandatory.
FAQ
What is the watchdog startup delay for MAX6372KA+T?
The MAX6372KA+T has a fixed 60s startup delay - it begins normal watchdog supervision exactly 60 seconds after power-up or reset, regardless of SET0/SET1/SET2 pin states. This delay is not configurable and is designed to accommodate lengthy microprocessor boot sequences in automotive and industrial systems. The MAX6372KA+T does not support first-edge or variable startup modes found in other family members like MAX6374KA+T.
Does MAX6372KA+T require an external pullup resistor on the WDO pin?
No, MAX6372KA+T does not require an external pullup resistor on the WDO pin because it features a push-pull output stage. When deasserted, WDO actively drives high; when asserted, it actively drives low for ≥1ms. This eliminates reliance on external components and ensures robust reset/interrupt signaling across voltage and temperature variations - a key distinction from open-drain variants like MAX6371KA+T.
How do the SET0, SET1, and SET2 pins configure timing on MAX6372KA+T?
On MAX6372KA+T, the SET0, SET1, and SET2 pins collectively select one of eight watchdog timeout periods ranging from 1ms to 60s, while the startup delay remains fixed at 60s. Each pin must be tied to either VCC or GND; floating connections are invalid. The specific timeout value is determined by the 3-bit combination per Table 1 in the datasheet - for example, SET2=0/SET1=0/SET0=0 selects 1ms timeout, while SET2=1/SET1=1/SET0=1 selects 60s timeout.
What is the maximum supply current of MAX6372KA+T at +125°C?
The maximum supply current of MAX6372KA+T at +125°C is 22µA, with a typical value of 10µA. This ultra-low quiescent current enables continuous watchdog supervision in thermally stressed, battery-dependent, or energy-harvested systems without compromising runtime or thermal design. The specification is guaranteed across the full -40°C to +125°C operating range and reflects actual measured performance, not typical-only data.
Can MAX6372KA+T be used in AEC-Q100 qualified automotive designs?
No, MAX6372KA+T is not AEC-Q100 qualified. Only MAX6369KA/V+ and MAX6374KA/V+ variants in this family carry AEC-Q100 qualification. While MAX6372KA+T operates across -40°C to +125°C and meets automotive-grade temperature specifications, it lacks the additional stress testing, failure analysis, and documentation required for formal AEC-Q100 compliance. For safety-critical automotive applications requiring certification, MAX6374KA/V+T is the recommended alternative.
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:
- 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
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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