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Analog Devices Inc./Maxim Integrated MAX6752KA23-T
- Part No.:
- MAX6752KA23-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6752KA23-T.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
The MAX6752KA23-T from Maxim Integrated is a window watchdog supervisory IC for microprocessor systems, featuring factory-trimmed 2.3V ±2% VCC reset threshold, capacitor-adjustable reset timeout (5.7–9.5ms), slow/fast windowed watchdog periods (tWD2 = 729–1214ms, tWD1 = 11.4–152ms depending on SET0/SET1), push-pull active-low RESET output, and operation over -40°C to +125°C. It monitors single supply voltage and provides robust brownout protection in automotive engine control units.
For engineers reviewing the MAX6752KA23-T datasheet, MAX6752KA23-T pinout, MAX6752KA23-T application, or MAX6752KA23-T equivalent, key selection criteria include its window watchdog architecture (rejecting both early and late WDI pulses), guaranteed RESET validity down to VCC ≥ 1V, ±2% reset threshold accuracy across automotive temperature range, and SOT23-8 package compatibility with space-constrained embedded designs.
Technical Context
The MAX6752KA23-T implements a dual-threshold window watchdog timer that asserts RESET when WDI falling edges occur either faster than tWD1 (fast fault) or slower than tWD2 (slow fault), with tWD1 selectable via SET0/SET1 pin strapping (8×, 16×, or 64× ratio relative to tWD2). Its reset function uses a precision bandgap reference and hysteresis (0.8% typical) to reject power-supply transients.
Reset timeout (tRP) and slow watchdog period (tWD2) are independently set by external capacitors CSRT and CSWT using linear ramp-current timing (250nA typical), enabling precise adjustment from sub-millisecond to >1 second. The device guarantees valid RESET assertion for VCC ≥ 1V and supports manual reset via external switch on RESET IN pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.3V ±2% - factory-trimmed precision threshold ensures reliable brownout detection at nominal 2.3V supply |
| Supply Current | 3.7µA (typ) at VCC ≤ 2.0V - ultra-low quiescent current extends battery life in portable automotive sensors |
| Reset Timeout Period | 5.69–9.49ms (CSRT = 1500pF) - capacitor-adjustable delay prevents premature μP release during power ramp-up |
| Slow Watchdog Period (tWD2) | 729–1214ms (CSWT = 1500pF) - sets upper bound of acceptable WDI pulse interval for windowed monitoring |
| Fast Watchdog Period (tWD1) | 11.4–152ms (SET ratio 64–8, CSWT = 1500pF) - defines lower bound of valid WDI pulse spacing to detect runaway code |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive applications requiring AEC-Q100 grade reliability |
| RESET Output Type | Push-pull active-low - eliminates external pullup resistor, simplifies interface to μP reset input with rail-to-rail drive |
Pinout & Package
Package: 8-pin SOT23, surface-mount, RoHS-compliant, tape-and-reel delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - WDI | Watchdog Input | Falling-edge-triggered input monitored for window violations; asserts RESET if pulses arrive too early (< tWD1) or too late (> tWD2) |
| 2 - SET1 | Watchdog Ratio Select | Logic input (GND/VCC) selecting tWD1/tWD2 ratio: low/high = 16×, high/low = disabled, high/high = 64× |
| 3 - GND | Ground Reference | Primary return path for internal circuitry and external timing capacitors CSRT/CSWT |
| 4 - VCC | Supply Voltage Input | Power source and monitored voltage rail; device asserts RESET if VCC falls below 2.3V ±2% |
| 5 - RESET | Reset Output | Push-pull active-low signal driving μP reset pin; guaranteed valid for VCC ≥ 1V |
| 6 - SWT | Slow Watchdog Timing | Capacitor connection point (to GND) setting tWD2; tWD2 = 0.65 × 10⁹ × CSWT (seconds) |
| 7 - SRT | Reset Timeout Timing | Capacitor connection point (to GND) setting tRP; tRP = 5.06 × 10⁶ × CSRT (seconds) |
| 8 - SET0 | Watchdog Ratio Select | Logic input (GND/VCC) selecting tWD1/tWD2 ratio: low/low = 8×, low/high = 16×, high/high = 64× |
Key Features
| Feature | Design Value |
|---|---|
| Window Watchdog Timer | Detects both fast faults (WDI pulses < tWD1) and slow faults (WDI pulses > tWD2), preventing false resets from jitter while catching hung firmware |
| Capacitor-Adjustable Timing | Independent CSRT and CSWT capacitors enable precise, board-level tuning of reset delay and watchdog window without firmware changes |
| Automotive Temperature Range | Full functionality from -40°C to +125°C ensures reliability in engine control, transmission, and ADAS modules |
| Reset Threshold Accuracy | ±2% over temperature eliminates need for calibration in safety-critical monitoring of 2.3V rails |
| Low Supply Current | 3.7µA typical at 2.0V enables use in always-on vehicle subsystems without draining battery |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Module |
|---|---|
Use Scenario: Monitors 2.3V core supply and validates microcontroller watchdog activity in real-time during engine start-stop cycles. IC Role / Device Role / Timing Role: Window watchdog supervisor asserting hardware reset on firmware hang or sensor data corruption. Use Value: Prevents unsafe ECU operation by detecting both stuck-loop (slow fault) and interrupt storm (fast fault) conditions within defined timing windows. | Use Scenario: Ensures continuous operation of image processing SoC in rear-view camera system powered by 2.3V LDO. IC Role / Device Role / Timing Role: Dual-threshold watchdog enforcing strict timing bounds on ISP firmware heartbeat signals. Use Value: Eliminates black screen or frozen video by triggering hard reset when ISP fails to service watchdog within tWD1–tWD2 window. |
| Automotive Body Control Module (BCM) | Electric Power Steering (EPS) Sensor Interface |
Use Scenario: Supervises 2.3V supply to CAN transceiver and microcontroller in door module with intermittent power events. IC Role / Device Role / Timing Role: Precision reset generator with transient immunity ensuring clean boot after load-dump events. Use Value: Guarantees deterministic startup by holding RESET asserted for ≥5.7ms after VCC recovery, avoiding race conditions. | Use Scenario: Monitors 2.3V analog front-end supply and validates torque-sensor sampling rate in EPS motor controller. IC Role / Device Role / Timing Role: Window watchdog verifying time-critical SPI communication between MCU and torque sensor ASIC. Use Value: Detects sensor communication failure or MCU lockup by enforcing tWD1–tWD2 timing constraints on SPI frame intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6753KA23-T | Open-drain RESET output instead of push-pull; identical window watchdog, timing, and threshold specs | Required where level-shifting to higher-voltage logic (e.g., 5V μP reset input) or wired-OR reset bus implementation | Select MAX6753KA23-T when interfacing to non-2.3V logic families or sharing RESET line with other supervisors |
| TLV803EB23DBVR | Fixed 2.3V reset only (no watchdog); 3.5µA supply current; SOT-23-5 package; no window watchdog capability | Suitable for basic power-on reset only-lacks dual-threshold fault detection needed for functional safety compliance | Choose TLV803EB23DBVR only for cost-sensitive, non-safety applications requiring minimal reset supervision without watchdog |
Compared with MAX6752KA23-T, MAX6753KA23-T offers identical window watchdog functionality but requires an external pullup for RESET, while TLV803EB23DBVR lacks watchdog entirely-making MAX6752KA23-T the sole option for ASIL-B capable windowed supervision in 2.3V automotive systems.
Availability
MAX6752KA23-T is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, and body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6752KA23-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 automotive, industrial, and computing markets with emphasis on reliability and integration.
The MAX6746–MAX6753 family delivers configurable microprocessor supervisory circuits with capacitor-adjustable timing and window watchdogs, targeting functional safety-critical automotive and industrial control applications.
FAQ
What is the factory-trimmed reset threshold voltage of the MAX6752KA23-T?
The MAX6752KA23-T has a factory-trimmed VCC reset threshold of 2.3V with ±2% tolerance over -40°C to +125°C, as confirmed by Table 2 (suffix "23") and Electrical Characteristics section. This precise threshold enables reliable monitoring of 2.3V power rails in automotive systems without external resistor dividers.
How does the window watchdog timer in the MAX6752KA23-T differ from standard watchdogs?
The MAX6752KA23-T implements a true window watchdog that asserts RESET for both fast faults (WDI pulses arriving faster than tWD1) and slow faults (pulses slower than tWD2), unlike standard timeout-only watchdogs. This dual-threshold behavior detects runaway code and interrupt storms, enhancing functional safety in automotive ECUs.
Can the MAX6752KA23-T monitor voltages other than VCC?
No-the MAX6752KA23-T is configured for single-supply monitoring only and lacks the RESET IN pin found in MAX6748–MAX6751 variants. Its reset function is dedicated to the VCC supply (2.3V threshold), and external voltage monitoring requires a separate supervisor like MAX6750KA23-T.
What are the timing capacitor formulas for reset and watchdog periods in the MAX6752KA23-T?
For the MAX6752KA23-T: reset timeout tRP = 5.06 × 10⁶ × CSRT (seconds), and slow watchdog period tWD2 = 0.65 × 10⁹ × CSWT (seconds). Fast watchdog period tWD1 is derived from tWD2 using SET0/SET1 ratios (8×, 16×, or 64×), as detailed in Table 1.
Is the MAX6752KA23-T qualified for automotive applications?
Yes-the MAX6752KA23-T is specified for -40°C to +125°C operation, packaged in automotive-grade SOT23, and designed for functional safety applications including engine control and ADAS. Though not explicitly AEC-Q100 certified in this documentation, its temperature rating and robustness features align with automotive requirements.
MAX6752KA23-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:
- 2.313V
- 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
MAX6752KA23-T FAQ
1.How can I place an order for MAX6752KA23-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6752KA23-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 MAX6752KA23-T reliable?
The price and inventory of MAX6752KA23-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6752KA23-T is usually 5 days.
3.What payment methods are accepted for MAX6752KA23-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6752KA23-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6752KA23-T?
MAX6752KA23-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6752KA23-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 MAX6752KA23-T?
For technical support, including MAX6752KA23-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6752KA23-T requirements.
6.How does Aetrix verify that MAX6752KA23-T is sourced from the original manufacturer or authorized distributors?
All MAX6752KA23-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 MAX6752KA23-T meets industry standards.
7.What is the process for return or replacement of MAX6752KA23-T?
All MAX6752KA23-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6752KA23-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 MAX6752KA23-T part is unused and in its original packaging.
Return procedure for MAX6752KA23-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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