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Analog Devices Inc./Maxim Integrated MAX6752KA46+
- Part No.:
- MAX6752KA46+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6752KA46+.pdf
- Description:
- MAX6752 UP RESET CKT W/CAPACITOR
- Quantity:
- Payment:
- Shipping:
Inventory:3,550
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Product details
Overview
MAX6752KA46+ from Maxim Integrated is a window watchdog supervisory IC for automotive-grade microprocessor monitoring, featuring factory-trimmed 4.625V ±2% VCC reset threshold, capacitor-adjustable reset timeout (tRP = 5.06×10⁶ × CSRT), slow/fast watchdog periods (tWD2 = 0.65×10⁹ × CSWT; tWD1 selectable via SET0/SET1 pinstrapping), and guaranteed RESET validity down to VCC ≥ 1V. It operates across -40°C to +125°C in battery-powered engine control units and ADAS domain controllers.
For engineers reviewing the MAX6752KA46+ datasheet, MAX6752KA46+ pinout, MAX6752KA46+ application, or MAX6752KA46+ equivalent, this page delivers verified timing parameters, window watchdog behavior, SOT23-8 terminal mapping, automotive temperature compliance, and real-world substitution guidance - all grounded in Maxim's official datasheet Rev 6 (April 2011).
Technical Context
The MAX6752KA46+ implements a dual-threshold window watchdog architecture: it asserts RESET when WDI falling edges occur either faster than tWD1 (fast fault) or slower than tWD2 (slow fault), with tWD2 set by CSWT and tWD1 selected via SET0/SET1 logic states (8×, 16×, or 64× tWD2 ratio). Its VCC monitor uses a ±2% factory-trimmed 4.625V threshold, while RESET IN remains unconnected in this variant (no dual-voltage monitoring).
Reset assertion is triggered by VCC drop below 4.625V, manual reset via MR (not present on MAX6752), or watchdog fault; RESET remains low for tRP after recovery. The device draws only 3.7µA at VCC ≤ 2.0V and supports push-pull or open-drain output - this part uses push-pull (confirmed by /V+ suffix and automotive qualification).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.625V ±2% (factory-trimmed; enables precise brownout detection for 5V systems) |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V (ultra-low power for always-on automotive modules) |
| Operating Temp | -40°C to +125°C (fully specified for under-hood automotive applications) |
| Reset Timeout | tRP = 5.06×10⁶ × CSRT (capacitor-adjustable from ~0.5ms to >9ms; supports diverse µP boot times) |
| Slow Watchdog | tWD2 = 0.65×10⁹ × CSWT (e.g., 975ms typical with 1500pF; defines upper fault boundary) |
| Fast Watchdog | tWD1 = tWD2 ÷ {8,16,64} (pin-selectable; e.g., 122ms typical at 8× ratio; defines lower fault boundary) |
| RESET Output | Push-pull active-low (guaranteed VOL ≤ 0.4V at ISINK = 3.2mA; eliminates external pull-up) |
Pinout & Package
MAX6752KA46+ is housed in an 8-pin SOT23 package (JEDEC MO-178AA), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and lead-free finish (+T suffix). Pin 1 is marked by a dot or beveled edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET IN | High-impedance input for external voltage monitoring; unused in MAX6752KA46+ (VCC-only mode) |
| 2 | SWT | Slow watchdog timeout input; connects to ground via capacitor (CSWT) to set tWD2 period |
| 3 | SRT | Reset timeout input; connects to ground via capacitor (CSRT) to set tRP duration |
| 4 | GND | Ground reference for all internal comparators and output stage |
| 5 | SET1 | Logic input selecting tWD1/tWD2 ratio (LOW/HIGH sets 8×/16×/64× or disable); referenced to VCC/GND |
| 6 | WDI | Watchdog input; falling edge resets timer if within tWD1–tWD2 window; ignored during RESET assertion |
| 7 | RESET | Push-pull active-low reset output; drives µP reset pin directly without pull-up resistor |
| 8 | VCC | Power supply input (1.2V–5.5V) and monitored voltage source for 4.625V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Window Watchdog Timer | Detects both fast (tWDI < tWD1) and slow (tWDI > tWD2) processor faults - critical for safety-critical firmware validation |
| Capacitor-Adjustable Timing | Independent tuning of reset (CSRT) and watchdog (CSWT) timeouts avoids fixed-timing inflexibility in multi-platform designs |
| Automotive Temperature Range | Full -40°C to +125°C operation with ±2% threshold stability ensures reliability in engine bay and ADAS ECU environments |
| Ultra-Low Supply Current | 3.7µA max at VCC ≤ 2.0V enables integration into always-on vehicle networks without battery drain concerns |
| Power-Supply Transient Immunity | Rejects 100mV transients lasting ≤50µs - prevents spurious resets during load-dump or ignition events |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Real-time monitoring of main 5V supply and safety MCU clock integrity in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Window watchdog enforces strict execution timing on safety-critical firmware; 4.625V threshold guards against 5V rail brownout. Use Value: Prevents undetected MCU lockup during transient overvoltage or undervoltage events common in automotive electrical systems. |
Use Scenario: Supervision of vision-processing SoC power rails and watchdog signaling in camera radar fusion modules. IC Role / Device Role / Timing Role: Dual-boundary watchdog detects both software hangs (slow fault) and timing violations (fast fault) in time-sensitive perception stacks. Use Value: Enables ASIL-B compliant fail-safe behavior by triggering controlled reboot before sensor data corruption propagates. |
| Telematics Control Unit (TCU) | Electric Vehicle Battery Management System (BMS) |
Use Scenario: Always-on cellular modem supervision in connected vehicle gateways operating across wide temperature swings. IC Role / Device Role / Timing Role: Push-pull RESET output drives modem reset pin directly; ultra-low ICC extends sleep-mode battery life. Use Value: Eliminates need for external level-shifting or pull-up components, reducing BOM count and PCB area in space-constrained TCUs. |
Use Scenario: Monitoring auxiliary 5V supply powering BMS communication ICs and isolated CAN transceivers. IC Role / Device Role / Timing Role: Factory-trimmed 4.625V threshold matches nominal 5V rail; window watchdog validates firmware heartbeat in ISO 26262-compliant diagnostics. Use Value: Provides deterministic reset response during high-noise battery pack switching events without false triggers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6753KA46+ | Identical VCC threshold (4.625V), same window watchdog, but includes SET0 pin for expanded ratio selection (vs. MAX6752's SET1-only configuration) | Supports full 8×/16×/64× tWD1 ratios plus watchdog disable; MAX6752 lacks SET0 and cannot disable watchdog without external logic | Select MAX6753KA46+ if watchdog disable capability is required; otherwise MAX6752KA46+ suffices for fixed-ratio operation |
| TPS3808G33DBVR | Fixed 3.3V reset threshold (not 4.625V); standard watchdog only (no window function); 1.8µA ICC; SOT23-6 package | Lacks slow/fast fault detection; suitable only for basic reset + timeout, not safety-critical timing validation | Choose TPS3808G33DBVR for cost-sensitive non-safety applications where 3.3V rail monitoring suffices and window watchdog is unnecessary |
Compared with MAX6752KA46+, MAX6753KA46+ adds watchdog disable flexibility via SET0, while TPS3808G33DBVR trades window functionality and 4.625V precision for lower cost and current - making MAX6752KA46+ optimal for automotive 5V systems requiring certified fault-boundary enforcement.
Availability
MAX6752KA46+ is available at Aetrix Electronics and suitable for automotive engine control, ADAS domain controllers, telematics gateways, and EV battery management systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6752KA46+ 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 communications markets, with emphasis on reliability and parametric accuracy.
The MAX6746–MAX6753 family delivers capacitor-adjustable supervisory functions targeting automotive microprocessor monitoring, where window watchdog behavior and ±2% threshold stability meet stringent ASIL requirements.
FAQ
What is the factory-trimmed reset threshold voltage for MAX6752KA46+?
The MAX6752KA46+ features a factory-trimmed VCC reset threshold of 4.625V with ±2% tolerance over -40°C to +125°C, as defined by the "46" suffix in Table 2 of the datasheet. This value is laser-trimmed during production and does not require external resistor networks - enabling precise 5V rail supervision without calibration.
Does MAX6752KA46+ support manual reset functionality?
No, the MAX6752KA46+ does not include a manual reset (MR) input. Per the Pin Description table and Selector Guide, MR is only present on MAX6746/MAX6747 variants. The MAX6752 relies solely on VCC monitoring, RESET IN (unused in this part), and window watchdog fault detection for reset assertion.
How is the window watchdog timeout configured on MAX6752KA46+?
The MAX6752KA46+ window watchdog uses two independent timeouts: slow period tWD2 is set by capacitor CSWT on pin 2 (tWD2 = 0.65×10⁹ × CSWT), while fast period tWD1 is selected via SET1 pin strapping (LOW/HIGH selects 8× or 16× tWD2 ratio; HIGH/HIGH selects 64×). SET0 is not connected on MAX6752 - only SET1 is functional.
What package type and finish does MAX6752KA46+ use?
The MAX6752KA46+ is supplied in an 8-pin SOT23 package (MO-178AA) with lead-free finish, indicated by the "+" in the part number suffix. It complies with JEDEC J-STD-020 moisture sensitivity level 1 and supports reflow soldering up to +260°C peak temperature.
Is MAX6752KA46+ qualified for automotive applications?
Yes, MAX6752KA46+ is explicitly automotive-qualified, denoted by the "/V" in its full ordering code (MAX6752KA46+/V+T per datasheet Table 3). It is fully specified over -40°C to +125°C, undergoes AEC-Q100 stress testing, and is intended for under-hood and safety-critical vehicle systems.
MAX6752KA46+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.625V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 5.692ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6752KA46+ FAQ
1.How can I place an order for MAX6752KA46+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6752KA46+ 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 MAX6752KA46+ reliable?
The price and inventory of MAX6752KA46+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6752KA46+ is usually 5 days.
3.What payment methods are accepted for MAX6752KA46+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6752KA46+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6752KA46+?
MAX6752KA46+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6752KA46+ 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 MAX6752KA46+?
For technical support, including MAX6752KA46+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6752KA46+ requirements.
6.How does Aetrix verify that MAX6752KA46+ is sourced from the original manufacturer or authorized distributors?
All MAX6752KA46+ 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 MAX6752KA46+ meets industry standards.
7.What is the process for return or replacement of MAX6752KA46+?
All MAX6752KA46+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6752KA46+, 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 MAX6752KA46+ part is unused and in its original packaging.
Return procedure for MAX6752KA46+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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