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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 UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
MAX6753KA31-T from Maxim Integrated is a window watchdog supervisory IC for microprocessor systems, featuring dual adjustable reset thresholds (VCC and RESET IN), capacitor-tunable reset timeout (tRP = 4.94×10⁶ × CSRT), fast/slow watchdog windows (tWD1/tWD2), and AEC-Q100 qualification for automotive use. It asserts an active-low RESET output during brownout, manual reset, or watchdog fault, with guaranteed operation down to VCC = 1.0V.
For engineers reviewing the MAX6753KA31-T datasheet, MAX6753KA31-T pinout, MAX6753KA31-T application, or MAX6753KA31-T equivalent, this device supports critical μP monitoring in battery-powered controllers, intelligent instruments, and automotive ECUs where precise windowed watchdog timing and dual-voltage supervision are required.
Technical Context
The MAX6753KA31-T implements a min/max (windowed) watchdog architecture that detects both early (faster than tWD1) and late (slower than tWD2) transitions on WDI - unlike standard watchdogs. Its reset threshold is factory-trimmed to 3.075V ±2% (suffix "31"), and RESET IN threshold is fixed at 1.235V ±0.019V.
Reset timeout and slow watchdog period (tWD2) are set independently via external capacitors on SRT and SWT pins (tRP = 4.94×10⁶ × CSRT; tWD2 = 0.65×10⁹ × CSWT), while fast watchdog ratio (tWD2/tWD1 = 8/16/64) is selected by strapping SET0/SET1. The device operates across –40°C to +125°C and draws only 3.7µA typical supply current at VCC ≤ 2.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 3.075V ±2% (factory-trimmed); ensures reliable power-on reset for 3.3V systems with margin against rail sag. |
| RESET Output Type | Active-low push-pull; drives high without external pull-up, simplifying interface to µP reset inputs. |
| Supply Current | 3.7µA (typ) at VCC ≤ 2.0V; enables ultra-low-power operation in battery-backed or portable applications. |
| Operating Temperature | –40°C to +125°C; fully specified for under-hood automotive and industrial embedded environments. |
| Reset Timeout Range | 0.506ms to 9.487ms (CSRT = 100pF to 1500pF); covers boot-time requirements of ARM Cortex-M and legacy 8-bit µPs. |
| Slow Watchdog Period | 64.77ms to 1214.4ms (CSWT = 100pF to 1500pF); sets lower bound of windowed watchdog detection window. |
| Fast Watchdog Ratio | Selectable 8×, 16×, or 64× tWD2 via SET0/SET1; defines upper bound (tWD1) for detecting premature WDI pulses. |
Pinout & Package
MAX6753KA31-T is housed in an 8-pin SOT23 package (package code K8+5, outline 21-0078), optimized for space-constrained PCB layouts in automotive and portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | Adjustable voltage monitor input | High-impedance comparator input referenced to 1.235V; used with external resistor divider to supervise secondary supply (e.g., 5V or 12V rail). |
| 2 - SET0 | Watchdog window ratio select | Logic input (GND/VCC) selecting tWD2/tWD1 ratio: low/low = 8×, low/high = 16×, high/high = 64×; high/low disables watchdog. |
| 3 - SWT | Slow watchdog timeout capacitor node | Connects to ground via CSWT to set tWD2 (slow fault window); formula tWD2 = 0.65×10⁹ × CSWT (seconds). |
| 4 - SRT | Reset timeout capacitor node | Connects to ground via CSRT to set tRP (reset assertion duration); formula tRP = 4.94×10⁶ × CSRT (seconds). |
| 5 - GND | Power ground reference | Return path for internal comparators, bias circuits, and RESET output stage; must be low-impedance. |
| 6 - SET1 | Watchdog window ratio select | Second logic input (GND/VCC) completing ratio selection with SET0 per Table 1; enables precise window tuning. |
| 7 - WDI | Window watchdog input | Falling-edge-sensitive input; triggers RESET if pulse interval falls outside tWD1–tWD2 window; rejects <300ns glitches. |
| 8 - VCC | Main supply input | Power source (1.0V–5.5V) and primary voltage monitor; RESET asserted when VCC drops below 3.075V ±2%. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer | Detects both fast (tWDI < tWD1) and slow (tWDI > tWD2) processor faults - prevents runaway code and stuck states missed by standard watchdogs. |
| Capacitor-adjustable timing | Independent tuning of reset timeout (SRT) and slow watchdog period (SWT) eliminates need for multiple part numbers or firmware changes. |
| AEC-Q100 qualified | Validated for automotive Grade 0 (–40°C to +125°C), enabling use in engine control units, ADAS sensors, and infotainment power management. |
| 3.7µA ultra-low supply current | Reduces quiescent load on coin-cell or supercap backup supplies, extending system uptime during main power loss. |
| RESET valid down to VCC = 1.0V | Guarantees deterministic reset state during brownout recovery, preventing partial initialization or metastability in µP peripherals. |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply and 5V analog sensor rail in harsh under-hood environment with wide temperature swings and EMI. IC Role / Device Role / Timing Role: Dual-voltage supervisor with windowed watchdog; asserts RESET if MCU fails to strobe WDI within 100ms–1.2s window or if either supply sags below threshold. Use Value: Prevents unsafe actuator behavior due to silent software lockup or undervoltage-induced register corruption. |
Use Scenario: Ensures fail-safe restart of ARM-based pump controller during battery swap or low-battery brownout events. IC Role / Device Role / Timing Role: Primary reset generator with capacitor-tuned 5ms reset hold time and 200ms fast watchdog window to catch motor driver firmware hangs. Use Value: Meets IEC 62304 Class C safety requirement for automatic recovery from transient software faults without user intervention. |
| Industrial PLC I/O Module | Portable Handheld Test Instrument |
Use Scenario: Supervises isolated 24V-to-3.3V DC-DC output powering FPGA and communication PHY in factory-floor automation gear. IC Role / Device Role / Timing Role: RESET IN monitors 24V rail via resistor divider; VCC monitors 3.3V logic rail; window watchdog validates FPGA configuration state machine. Use Value: Eliminates need for separate supervisor ICs, reducing BOM count and improving MTBF in mission-critical control loops. |
Use Scenario: Provides robust power-on reset and runtime watchdog for lithium-ion powered multimeter with Bluetooth LE connectivity. IC Role / Device Role / Timing Role: Push-pull RESET drives µP directly; 3.7µA ICC extends battery life; tWD1/tWD2 tuned to match BLE connection interval and measurement cycle. Use Value: Enables >12-month shelf life on single CR2032 cell while maintaining guaranteed fault detection during active measurement sessions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6752KA31-T | Identical reset threshold (3.075V) and pinout, but lacks SET1 pin and fixed 8× window ratio; no SET1 strapping option. | Suitable for simpler systems requiring only one fast watchdog window; not compatible where dynamic ratio switching is needed. | Select MAX6752KA31-T only if SET1 functionality is unused and cost reduction is prioritized over design flexibility. |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, no RESET IN input, no windowed watchdog (standard timeout only), higher ICC (8µA typ). | Limited to single-rail 3.3V systems without secondary voltage monitoring or advanced fault detection requirements. | Choose TPS3808G33DBVR only for cost-sensitive consumer applications where windowed watchdog and dual-supply monitoring are unnecessary. |
Compared with MAX6752KA31-T and TPS3808G33DBVR, the MAX6753KA31-T uniquely supports three programmable watchdog window ratios via dual SET pins and retains full RESET IN capability - making it the only option among the three for safety-critical dual-supply systems requiring configurable fault detection windows.
Availability
MAX6753KA31-T is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pump controllers, industrial PLC I/O modules, and portable handheld test instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.
The MAX6746–MAX6753 family was designed specifically for high-reliability microprocessor supervision in automotive and industrial environments, emphasizing AEC-Q100 compliance, ultra-low power, and advanced watchdog architectures.
FAQ
What is the factory-trimmed reset threshold voltage for MAX6753KA31-T?
The MAX6753KA31-T has a factory-trimmed VCC reset threshold of 3.075V ±2% (minimum 3.014V, maximum 3.137V) across –40°C to +125°C, as defined by the "31" suffix in its part number and confirmed in Table 2 of the datasheet.
Does MAX6753KA31-T support dual-voltage monitoring?
Yes, MAX6753KA31-T supports dual-voltage monitoring: its VCC pin monitors the primary supply (3.075V threshold), and its RESET IN pin monitors a secondary voltage using an external resistor divider referenced to a fixed 1.235V internal threshold.
How is the windowed watchdog timeout configured on MAX6753KA31-T?
The MAX6753KA31-T uses two independent settings: slow watchdog period (tWD2) is set by capacitor CSWT on SWT pin (tWD2 = 0.65×10⁹ × CSWT), and fast watchdog period (tWD1) is selected as 1/8, 1/16, or 1/64 of tWD2 via SET0/SET1 pin strapping.
What package type and footprint does MAX6753KA31-T use?
MAX6753KA31-T is supplied in an 8-pin SOT23 package (package code K8+5, outline 21-0078, land pattern 90-0176), with pin-compatible layout to industry-standard SOT23-8 footprints and RoHS-compliant termination.
Is MAX6753KA31-T qualified for automotive applications?
Yes, MAX6753KA31-T is AEC-Q100 qualified (Grade 0) and fully specified over –40°C to +125°C, making it suitable for under-hood automotive applications including engine control, body electronics, and ADAS subsystems.
MAX6753KA31-T 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:
- 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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