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Analog Devices Inc./Maxim Integrated MAX6752KA23
- Part No.:
- MAX6752KA23
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6752KA23.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:2,218
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Product details
Overview
MAX6752KA23 from Maxim Integrated is a window watchdog supervisory IC for automotive-grade microprocessor monitoring, featuring factory-trimmed 2.313V ±2% VCC reset threshold, capacitor-adjustable 0.506–9.487ms reset timeout (CSRT), and dual-window watchdog with fast timeout tWD1 = 4.05–15.18ms and slow timeout tWD2 = 64.77–151.80ms (CSWT). It operates across -40°C to +125°C and delivers 3.7µA supply current at VCC ≤ 2.0V.
For engineers reviewing the MAX6752KA23 datasheet, MAX6752KA23 pinout, MAX6752KA23 application, or MAX6752KA23 equivalent, this device serves as a precision voltage supervisor and intelligent window watchdog for safety-critical embedded controllers where out-of-window processor activity must trigger reset - especially in battery-powered automotive ECUs and industrial PLCs requiring guaranteed reset validity down to VCC ≥ 1V.
Technical Context
The MAX6752KA23 implements a min/max (windowed) watchdog architecture that detects both early (faster than tWD1) and late (slower than tWD2) transitions on WDI, using independent SET0/SET1 pinstrapping to select tWD1/tWD2 ratios of 8×, 16×, or 64×. Its reset function monitors only VCC (not RESET IN), with fixed 2.313V threshold and immunity to transients ≤50µs when overdriven by 100mV.
Unlike MAX6746–MAX6751 variants, it omits WDS and MR pins, instead integrating SET0/SET1 for watchdog ratio control and using SRT/SWT for separate reset and slow watchdog timing capacitors. The device asserts active-low RESET via push-pull output and guarantees valid logic state for VCC ≥ 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.313V ±2% (factory-trimmed; enables precise brownout detection at 2.3V rail) |
| Supply Current | 3.7µA at VCC ≤ 2.0V (enables multi-year operation in coin-cell–powered systems) |
| Reset Timeout Range | 0.506–9.487ms (set by 100–1500pF capacitor on SRT; covers boot-time delays from 8-bit to ARM Cortex-M) |
| Fast Watchdog Period (tWD1) | 4.05–15.18ms (selectable via SET0/SET1; defines minimum allowable WDI pulse interval) |
| Slow Watchdog Period (tWD2) | 64.77–151.80ms (set by 100–1500pF capacitor on SWT; defines maximum allowable WDI pulse interval) |
| Operating Temperature | -40°C to +125°C (fully specified for under-hood automotive applications) |
| RESET Output Type | Push-pull active-low (eliminates external pull-up; ensures clean logic transition without bus contention) |
Pinout & Package
MAX6752KA23 is housed in an 8-pin SOT23-8 package (2.0mm × 2.1mm × 1.25mm), optimized for space-constrained automotive PCBs and qualified for reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SET0 | Watchdog window ratio select input | Logic input (HIGH = VCC, LOW = GND); configures tWD1/tWD2 ratio to 8×, 16×, or 64×; HIGH+LOW disables watchdog |
| 2 - SET1 | Watchdog window ratio select input | Logic input (HIGH = VCC, LOW = GND); used with SET0 to define window ratio per Table 1; HIGH+LOW disables watchdog |
| 3 - GND | Ground reference | Analog/digital common return; requires low-impedance connection to minimize noise coupling into reset timing |
| 4 - VCC | Power supply input | Monitored supply rail (1.2–5.5V); powers internal circuitry and sets operating voltage for RESET output drive strength |
| 5 - RESET | Active-low reset output | Push-pull driver; asserts low for full reset timeout after fault; guaranteed functional down to VCC = 1V |
| 6 - SWT | Slow watchdog timeout capacitor terminal | Connects to ground via low-leakage capacitor (100–1500pF) to set tWD2; determines maximum allowable WDI interval |
| 7 - SRT | Reset timeout capacitor terminal | Connects to ground via low-leakage capacitor (100–1500pF) to set tRP; defines duration RESET remains asserted post-fault |
| 8 - WDI | Watchdog input | Falling-edge–triggered; monitored for timing violations against tWD1/tWD2 windows; ignored during RESET assertion |
Key Features
| Feature | Design Value |
|---|---|
| Window watchdog timer | Detects both premature (tWDI < tWD1) and delayed (tWDI > tWD2) WDI transitions - critical for detecting runaway code or clock faults |
| Capacitor-adjustable timing | Independent SRT (reset) and SWT (slow watchdog) pins enable precise, application-tailored timeouts without firmware changes |
| Factory-trimmed 2.313V threshold | ±2% accuracy over -40°C to +125°C eliminates need for external resistor divider and associated BOM cost |
| Ultra-low 3.7µA supply current | Enables direct integration into always-on domains of automotive body controllers and telematics modules |
| Push-pull RESET output | Eliminates external pull-up resistor and associated leakage path - simplifies layout and improves noise immunity |
| Transient immunity | Withstands VCC glitches ≤50µs at 100mV below threshold - prevents spurious resets during load-dump or ignition events |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Monitors 2.3V core supply and validates MCU instruction flow in diesel engine ECU exposed to wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Window watchdog enforces strict execution timing on safety-critical fuel injection routines; VCC supervisor prevents boot corruption during cold cranking. Use Value: Prevents undetected software lockup that could cause uncontrolled fuel delivery - meeting ASIL-B functional safety requirements. |
Use Scenario: Supervises ARM-based controller in modular I/O rack operating continuously in factory environments with 24VDC power rails. IC Role / Device Role / Timing Role: Resets CPU if watchdog pulses fall outside tWD1–tWD2 window due to firmware hang or clock failure; push-pull RESET drives optocoupler input directly. Use Value: Eliminates need for external level-shifting components while ensuring deterministic recovery from transient faults. |
| Battery-Powered Telematics Gateway | Railway Signaling Interface Module |
Use Scenario: Powers on/off sequence management and runtime supervision in LTE-connected vehicle tracker powered by Li-SOCl₂ primary cell. IC Role / Device Role / Timing Role: Low 3.7µA ICC extends battery life; capacitor-adjustable tWD2 accommodates variable cellular handshake durations. Use Value: Enables >10-year field deployment without maintenance by minimizing quiescent current and supporting adaptive watchdog timing. |
Use Scenario: Ensures fail-safe behavior in EN 5012x-compliant signaling interface handling track occupancy data. IC Role / Device Role / Timing Role: Detects both stuck-at-high and stuck-at-low WDI conditions caused by FPGA configuration errors or EMI-induced bit flips. Use Value: Provides dual-fault coverage exceeding SIL-2 requirements for railway interlocking systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6753KA23 | Open-drain RESET output; identical VTH, timing specs, and watchdog architecture | Requires external pull-up; suited for mixed-voltage systems where RESET must interface to 3.3V or 5V logic domains | Select MAX6753KA23 when level-shifting or wired-OR reset bus topology is required |
| TLV809K23DBZR | Fixed 2.32V reset IC only; no watchdog, no adjustable timing, no windowed detection | Limited to basic power-on reset; cannot detect software hangs or timing violations | Choose TLV809K23DBZR only for cost-sensitive, non-safety applications lacking runtime supervision needs |
Compared with MAX6752KA23, MAX6753KA23 offers identical supervision intelligence but requires external pull-up for open-drain operation, while TLV809K23DBZR provides only static reset functionality - making MAX6752KA23 uniquely suitable for applications demanding both precise voltage monitoring and adaptive windowed watchdog coverage.
Availability
MAX6752KA23 is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and battery-powered telematics gateways requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6752KA23 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 high-performance analog and mixed-signal semiconductors for automotive, industrial, and communications markets, with emphasis on reliability and precision under harsh conditions.
The MAX6746–MAX6753 product line delivers automotive-qualified µP supervisors with capacitor-adjustable timing and advanced watchdog architectures - specifically engineered for functional safety-critical embedded systems where deterministic reset behavior is non-negotiable.
FAQ
What is the factory-trimmed reset threshold voltage for MAX6752KA23?
The MAX6752KA23 features a factory-trimmed VCC reset threshold of 2.313V ±2% over the full -40°C to +125°C automotive temperature range. This value is confirmed in Table 2 of the datasheet, where suffix "23" corresponds to TYP = 2.313V. The threshold is internally trimmed and does not require external resistor networks, enabling accurate brownout detection for 2.3V supply rails without calibration.
How does the window watchdog function in MAX6752KA23 differ from standard watchdog timers?
The MAX6752KA23 implements a true window watchdog that asserts RESET if WDI falling edges occur either too soon (faster than tWD1) or too late (slower than tWD2) relative to the expected window. Unlike single-timeout watchdogs, this dual-bound detection catches both runaway loops and stalled processors - a capability confirmed in the Detailed Description section and Figure 1 of the datasheet.
Can MAX6752KA23 monitor an external voltage like RESET IN?
No. The MAX6752KA23 monitors only the VCC supply voltage using its factory-trimmed 2.313V threshold. It lacks the RESET IN pin found on MAX6748–MAX6751 variants and does not support external voltage monitoring via resistor dividers. Its pinout (SET0/SET1/SWT/SRT/WDI/VCC/GND/RESET) confirms dedicated window watchdog functionality without adjustable input monitoring.
What is the minimum and maximum reset timeout period achievable with MAX6752KA23?
The MAX6752KA23 supports a reset timeout period (tRP) ranging from 0.506ms to 9.487ms, determined by capacitor CSRT on the SRT pin. At CSRT = 100pF, tRP = 0.506ms (typ); at CSRT = 1500pF, tRP = 9.487ms (typ). These values are explicitly listed in the Electrical Characteristics table under "Reset Timeout Period tRP" and scale linearly per the formula tRP = 5.06 × 10⁶ × CSRT.
Does MAX6752KA23 include manual reset (MR) capability?
No. The MAX6752KA23 does not include a manual reset (MR) input. Its pin configuration (per Pin Configurations diagram on page 13) shows pins 1–2 as SET0/SET1, not MR. Manual reset is only present on MAX6746/MAX6747 variants. For systems requiring operator-initiated reset, external circuitry interfacing with WDI or system-level reset logic must be implemented.
MAX6752KA23 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:
- 5.692ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6752KA23 FAQ
1.How can I place an order for MAX6752KA23 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6752KA23 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 reliable?
The price and inventory of MAX6752KA23 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6752KA23 is usually 5 days.
3.What payment methods are accepted for MAX6752KA23?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6752KA23 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6752KA23?
MAX6752KA23 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6752KA23 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?
For technical support, including MAX6752KA23 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6752KA23 requirements.
6.How does Aetrix verify that MAX6752KA23 is sourced from the original manufacturer or authorized distributors?
All MAX6752KA23 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 meets industry standards.
7.What is the process for return or replacement of MAX6752KA23?
All MAX6752KA23 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6752KA23, 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 part is unused and in its original packaging.
Return procedure for MAX6752KA23:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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