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Analog Devices Inc./Maxim Integrated MAX6753KA31+T
- Part No.:
- MAX6753KA31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6753KA31+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,274
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Product details
Overview
MAX6753KA31+T from Analog Devices is a window watchdog supervisory IC for microprocessor systems, featuring factory-trimmed 3.075V ±2% VCC reset threshold, capacitor-adjustable reset timeout (5.7–9.5ms), and dual-mode window watchdog with fast/slow fault detection (tWD1 = 121ms / tWD2 = 971ms typical at CSWT = 1500pF). It operates from 1.2V to 5.5V and is AEC-Q100 qualified for automotive applications requiring robust brownout and timing fault protection.
For engineers reviewing the MAX6753KA31+T datasheet, MAX6753KA31+T pinout, MAX6753KA31+T application, or MAX6753KA31+T equivalent, this device delivers precise voltage monitoring, transient-immune reset assertion down to VCC ≥ 1V, configurable windowed watchdog behavior via SET0/SET1 pins, and push-pull active-low RESET output in an 8-pin SOT23 package.
Technical Context
The MAX6753KA31+T implements a min/max (window) watchdog architecture that detects both early (faster than tWD1) and late (slower than tWD2) transitions on WDI - unlike standard watchdogs. Its reset comparator uses a precision 3.075V threshold with ±2% tolerance over −40°C to +125°C, and reset timeout is set by external capacitor CSRT using tRP = 4.94 × 10⁶ × CSRT.
Watchdog timing is decoupled: slow period tWD2 (729–1214 ms) is set by CSWT, while fast period tWD1 is selected via SET0/SET1 pin strapping (8×, 16×, or 64× ratio relative to tWD2). The device asserts RESET for the full tRP duration upon any fault, and guarantees valid logic state for VCC ≥ 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 3.075V ±2% - factory-trimmed for accurate 3.3V rail monitoring without external resistors |
| Supply Voltage Range | 1.2V to 5.5V - supports low-voltage microcontrollers and wide-input industrial systems |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V - enables multi-year battery life in portable equipment |
| Reset Timeout Period | 5.69–9.49ms (CSRT = 1500pF) - adjustable from ~0.5ms to >100ms via capacitor selection |
| Slow Watchdog Period (tWD2) | 729–1214ms (CSWT = 1500pF) - sets upper bound of valid watchdog window |
| Fast Watchdog Period (tWD1) | 121ms typical (SET0=LOW/SET1=LOW, CSWT = 1500pF) - defines lower bound of valid watchdog window |
| Operating Temperature | −40°C to +125°C - fully specified for under-hood automotive and industrial environments |
Pinout & Package
MAX6753KA31+T is housed in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176), optimized for space-constrained PCB layouts and compatible with standard reflow profiles (260°C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | Adjustable reset input | High-impedance comparator input; used with external resistor divider to monitor secondary supply (not used in MAX6753KA31+T's fixed-threshold configuration) |
| 2 - SET0 | Window ratio select input | Logic input (GND/VCC) selecting tWD2/tWD1 ratio: LOW/LOW = 8×, LOW/HIGH = 16×, HIGH/HIGH = 64× |
| 3 - SWT | Slow watchdog timeout input | Capacitor-connected node setting tWD2 (slow watchdog period); tWD2 = 0.65 × 10⁹ × CSWT |
| 4 - SRT | Reset timeout input | Capacitor-connected node setting tRP (reset pulse width); tRP = 4.94 × 10⁶ × CSRT |
| 5 - GND | Ground reference | Analog and digital ground common return path; must be low-impedance for noise immunity |
| 6 - SET1 | Window ratio select input | Second logic input defining tWD2/tWD1 ratio alongside SET0; HIGH/LOW disables watchdog |
| 7 - RESET | Active-low reset output | Push-pull driver asserting low for tRP upon VCC drop, WDI fault, or manual reset; valid for VCC ≥ 1V |
| 8 - VCC | Power supply input | Main supply rail (1.2–5.5V); powers internal circuitry and serves as monitored voltage source |
Key Features
| Feature | Design Value |
|---|---|
| Window watchdog timer | Detects both premature (tWDI < tWD1) and delayed (tWDI > tWD2) WDI transitions - prevents runaway code and stuck states missed by standard watchdogs |
| Factory-trimmed 3.075V reset threshold | ±2% accuracy over −40°C to +125°C eliminates need for external resistor network and calibration effort |
| Capacitor-adjustable timing | Independent tuning of reset timeout (SRT) and slow watchdog period (SWT) enables precise alignment with μP boot/firmware cycles |
| AEC-Q100 qualification | Qualified for automotive applications including engine control units and ADAS subsystems requiring high reliability |
| Ultra-low 3.7µA supply current | Enables use in always-on battery-powered nodes without compromising system runtime |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Real-time monitoring of 3.3V microcontroller supply and software execution timing in engine management systems exposed to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Window watchdog supervisor asserting reset when firmware fails to strobe WDI within defined tWD1–tWD2 window, plus precise 3.075V brownout detection. Use Value: Prevents unsafe actuator commands due to silent firmware hangs or voltage sags, meeting ISO 26262 ASIL-B functional safety requirements. |
Use Scenario: Ensuring deterministic startup and continuous operation of ARM-based pump controller running safety-critical infusion algorithms on a Li-ion battery supply. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors 3.3V rail for brownout (3.075V threshold) and validates real-time task scheduling via windowed watchdog on WDI. Use Value: Guarantees fail-safe shutdown if motor control loop stalls or power drops below safe operating margin, supporting IEC 62304 Class C software. |
| Industrial PLC I/O Module | Smart Energy Meter MCU |
Use Scenario: Protecting programmable logic controller modules operating in harsh factory environments with wide temperature swings and EMI. IC Role / Device Role / Timing Role: Provides reset assertion immune to 50µs/100mV VCC transients and detects out-of-window WDI activity caused by electromagnetic interference-induced timing jitter. Use Value: Eliminates spurious resets and undetected lockups, improving mean time between failures (MTBF) in 24/7 automation systems. |
Use Scenario: Supervising metrology SoC in utility-grade electricity meters subjected to long-term thermal stress and conducted surges on AC mains interface. IC Role / Device Role / Timing Role: Monitors 3.3V supply with ±2% threshold stability over 15-year field life and enforces strict firmware watchdog window to prevent meter data corruption. Use Value: Maintains metrological accuracy certification (IEC 62053) by preventing undetected MCU faults that could skew energy accumulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6752KA32+T | Identical pinout and window watchdog architecture, but factory-trimmed 3.200V reset threshold (±2%, 3.136–3.264V) | Suitable where 3.3V rail tolerance requires higher trip point to avoid nuisance resets during nominal ripple | Select MAX6752KA32+T when system VCC nominal is 3.3V with tight regulation; MAX6753KA31+T preferred for looser 3.3V rails or 3.0V systems. |
| TPS3808G33DBVR | Single-function reset IC with 3.3V threshold and fixed 200ms watchdog; no window mode, no SET0/SET1 configuration | Lacks dual-fault detection capability and adjustable timing; limited to basic reset + timeout supervision | Choose TPS3808G33DBVR only for cost-sensitive designs where window watchdog functionality is unnecessary and fixed timing suffices. |
Compared with MAX6752KA32+T and TPS3808G33DBVR, the MAX6753KA31+T uniquely combines factory-trimmed 3.075V reset accuracy, capacitor-tunable window watchdog boundaries, and AEC-Q100 qualification - making it optimal for automotive and medical systems demanding precise fault coverage across voltage and timing domains.
Availability
MAX6753KA31+T is available at Aetrix Electronics and suitable for automotive ECUs, medical infusion pumps, industrial PLC modules, and smart energy meters requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for MAX6753KA31+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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The MAX6746–MAX6753 family was designed specifically for robust microprocessor supervision in harsh environments, integrating precision voltage monitoring, transient-immune reset generation, and advanced window watchdog functionality into miniature SOT23 packages.
FAQ
What is the factory-trimmed reset threshold voltage of the MAX6753KA31+T?
The MAX6753KA31+T features a factory-trimmed VCC reset threshold of 3.075V with ±2% tolerance over −40°C to +125°C. This value is confirmed in Table 2 of the datasheet under suffix "31", and applies directly to the MAX6753KA31+T variant. It is optimized for reliable supervision of 3.3V supply rails without external resistor networks.
Does the MAX6753KA31+T support window watchdog functionality, and how is it configured?
Yes, the MAX6753KA31+T implements a true window watchdog timer that detects both fast faults (WDI transitions faster than tWD1) and slow faults (WDI transitions slower than tWD2). Configuration is achieved via SET0 and SET1 pin strapping: for example, SET0 = LOW and SET1 = LOW selects an 8× ratio (tWD2/tWD1 = 8), yielding tWD1 ≈ 121ms when tWD2 = 971ms (CSWT = 1500pF).
What package type and footprint does the MAX6753KA31+T use?
The MAX6753KA31+T is packaged in an 8-pin SOT23 case (outline number 21-0078, land pattern 90-0176), with RoHS-compliant lead finish. Its compact 2.9mm × 1.6mm footprint supports high-density PCB layouts and is compatible with standard automated assembly processes including reflow soldering at 260°C peak temperature.
Is the MAX6753KA31+T qualified for automotive applications?
Yes, the MAX6753KA31+T is AEC-Q100 qualified and fully specified over the automotive temperature range of −40°C to +125°C. Its design includes power-supply transient immunity, guaranteed RESET validity down to VCC = 1V, and robust latch-up immunity - making it suitable for engine control, body electronics, and ADAS subsystems.
How is the reset timeout period adjusted on the MAX6753KA31+T?
The reset timeout period (tRP) of the MAX6753KA31+T is adjusted by connecting an external capacitor (CSRT) between the SRT pin and GND. The relationship is tRP = 4.94 × 10⁶ × CSRT, where tRP is in seconds and CSRT in farads. For example, a 1500pF capacitor yields tRP ≈ 7.4ms (typical), matching the 5.69–9.49ms range specified in the Electrical Characteristics table.
MAX6753KA31+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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.075V
- Output:
- Open Drain or Open Collector
- 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
MAX6753KA31+T FAQ
1.How can I place an order for MAX6753KA31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6753KA31+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 MAX6753KA31+T reliable?
The price and inventory of MAX6753KA31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6753KA31+T is usually 5 days.
3.What payment methods are accepted for MAX6753KA31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6753KA31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6753KA31+T?
MAX6753KA31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6753KA31+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 MAX6753KA31+T?
For technical support, including MAX6753KA31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6753KA31+T requirements.
6.How does Aetrix verify that MAX6753KA31+T is sourced from the original manufacturer or authorized distributors?
All MAX6753KA31+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 MAX6753KA31+T meets industry standards.
7.What is the process for return or replacement of MAX6753KA31+T?
All MAX6753KA31+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6753KA31+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 MAX6753KA31+T part is unused and in its original packaging.
Return procedure for MAX6753KA31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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