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Analog Devices Inc./Maxim Integrated MAX6752KA29+T
- Part No.:
- MAX6752KA29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6752KA29+T.pdf
- Description:
- IC RESET MPU W/ADJ RESET SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,936
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Product details
Overview
MAX6752KA29+T from Analog Devices is a window watchdog supervisory IC for microprocessor systems, featuring factory-trimmed 2.925V VCC reset threshold (±2%), capacitor-adjustable reset timeout (5.7–9.5ms), and dual-window watchdog with fast/slow fault detection (tWD1 = 11.4–152ms, tWD2 = 729–1214ms). It operates from 1.2V to 5.5V supply and delivers 3.7µA quiescent current, targeting automotive and medical power-up/brownout monitoring.
For engineers reviewing the MAX6752KA29+T datasheet, MAX6752KA29+T pinout, MAX6752KA29+T application, or MAX6752KA29+T equivalent, key selection criteria include its AEC-Q100 qualification, SOT23-8 package, push-pull RESET output, windowed watchdog timing ratios (8×/16×/64×), and dual-voltage monitoring capability via external resistor divider on RESET IN.
Technical Context
The MAX6752KA29+T implements a min/max (window) watchdog architecture 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 monitors VCC against a fixed 2.925V threshold and supports optional external voltage monitoring via RESET IN input with 1.235V internal reference.
Reset timeout (tRP) and slow watchdog period (tWD2) are independently set using external capacitors on SRT and SWT pins (tRP = 4.94×10⁶ × CSRT; tWD2 = 0.65×10⁹ × CSWT), enabling precise adaptation to processor boot time and software execution windows. The device guarantees valid RESET assertion down to VCC ≥ 1V and exhibits immunity to transients ≤ 50µs at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.2V to 5.5V - supports wide-input battery and rail-powered systems without external regulation |
| VCC Reset Threshold | 2.925V ±2% - factory-trimmed for precise brownout detection at nominal 2.9V rail |
| Quiescent Current | 3.7µA at VCC ≤ 2.0V - enables multi-year operation in battery-backed medical or automotive modules |
| Reset Timeout Period | 5.69–9.49ms (CSRT = 1500pF) - configurable to exceed µP power-on reset requirements |
| Slow Watchdog Period (tWD2) | 729–1214ms (CSWT = 1500pF) - defines upper bound of acceptable software loop interval |
| Fast Watchdog Period (tWD1) | 11.4–152ms (SET0/SET1-selectable) - defines minimum inter-pulse timing to detect runaway code |
| Operating Temperature | −40°C to +125°C - fully specified for under-hood automotive and industrial environments |
Pinout & Package
MAX6752KA29+T is housed in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176), optimized for space-constrained PCB layouts in automotive ECUs and portable medical devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET IN | Adjustable voltage monitor input | High-impedance node for external resistor-divider; sets secondary reset threshold (1.235V ref) |
| 2: SET0 | Watchdog window ratio control | Logic input selecting tWD1/tWD2 ratio: low/low = 8×, low/high = 16×, high/high = 64× |
| 3: SWT | Slow watchdog timing capacitor | Connects to GND via CSWT to set tWD2 (729–1214ms typical); open disables watchdog |
| 4: SRT | Reset timeout timing capacitor | Connects to GND via CSRT to set tRP (5.7–9.5ms typical); open disables reset timeout |
| 5: GND | Ground reference | Primary return path for all internal circuits and external timing capacitors |
| 6: SET1 | Watchdog window ratio control | Logic input paired with SET0; high/low disables watchdog timer |
| 7: RESET | Push-pull active-low reset output | Drives µP reset pin directly; guaranteed valid for VCC ≥ 1V; no external pullup required |
| 8: VCC | Power supply input | Supplies internal circuitry and serves as primary monitored voltage (2.925V threshold) |
Key Features
| Feature | Design Value |
|---|---|
| Window watchdog timer | Detects both fast (tWDI < tWD1) and slow (tWDI > tWD2) software faults-critical for safety-critical firmware validation |
| Capacitor-adjustable timing | Independent SRT and SWT pins enable precise, board-level tuning of reset and watchdog timeouts without firmware changes |
| AEC-Q100 qualified | Qualified for automotive applications per Grade 0 (−40°C to +125°C), supporting ECU and ADAS deployment |
| Low-power operation | 3.7µA supply current at 2.0V enables integration into always-on battery subsystems with minimal drain |
| Transient-immune reset | Rejects ≤50µs supply glitches at 100mV overdrive-reduces false resets in noisy automotive electrical environments |
Applications
| Automotive Engine Control Unit (ECU) | Portable Medical Infusion Pump |
|---|---|
Use Scenario: Monitors 2.9V microcontroller supply and validates firmware heartbeat during engine cranking and load dump events. IC Role / Device Role / Timing Role: Window watchdog enforces strict software execution timing; fixed VCC reset ensures reliable startup after battery voltage recovery. Use Value: Prevents undetected lockup during transient-rich vehicle electrical conditions, meeting ISO 26262 ASIL-B functional safety requirements. |
Use Scenario: Supervises ARM Cortex-M4 controller in battery-powered infusion pump with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Low-quiescent-current supervisor provides long-term brownout protection and detects missed motor-control pulses. Use Value: Extends battery life while guaranteeing fail-safe shutdown upon missed watchdog strobes-critical for drug delivery accuracy. |
| Industrial PLC I/O Module | Smart Energy Meter |
Use Scenario: Ensures deterministic restart of real-time Linux-based controller after AC line sags or surges in factory automation. IC Role / Device Role / Timing Role: Dual-voltage monitoring (VCC + external rail) validates both logic and analog sensor supplies before enabling I/O drivers. Use Value: Eliminates spurious reboots during 100ms line interruptions, maintaining process continuity in mission-critical control loops. |
Use Scenario: Guards metering SoC during rapid grid voltage fluctuations and RF interference from AMR/AMI communication bursts. IC Role / Device Role / Timing Role: Push-pull RESET output drives SoC reset directly; window watchdog catches corrupted metrology firmware loops. Use Value: Maintains revenue-grade measurement integrity by forcing controlled reboot instead of silent data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6753KA29+T | Open-drain RESET output; identical timing, thresholds, and watchdog functionality | Requires external pullup for µP interface; better suited for level-shifting or wired-OR reset buses | Select when interfacing to mixed-voltage systems or sharing RESET line across multiple supervisors |
| TPS3808G33DBVR | Fixed 3.3V reset threshold; standard (non-window) watchdog; 1.8µA ICC; SOT23-6 package | Lacks slow/fast fault discrimination; smaller footprint but no RESET IN pin for dual-rail monitoring | Choose for cost-sensitive, single-rail applications where window watchdog is unnecessary |
Compared with MAX6752KA29+T, MAX6753KA29+T offers identical supervision logic but requires external pullup due to open-drain output, while TPS3808G33DBVR reduces solution size and power but sacrifices windowed watchdog capability and dual-voltage monitoring-making MAX6752KA29+T optimal for safety-critical dual-rail automotive and medical designs.
Availability
MAX6752KA29+T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical devices, industrial PLC modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6752KA29+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 semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The MAX6746–MAX6753 family was designed specifically for robust microprocessor supervision in harsh environments, emphasizing AEC-Q100 compliance, ultra-low power, and advanced watchdog architectures for functional safety.
FAQ
What is the factory-set reset threshold voltage for MAX6752KA29+T?
The MAX6752KA29+T has a factory-trimmed VCC reset threshold of 2.925V with ±2% tolerance over −40°C to +125°C. This value corresponds to the "29" suffix in the part number and is verified per Table 2 in the datasheet. The device does not support adjustable VCC threshold-only RESET IN can be configured externally using a resistor divider referenced to its 1.235V internal comparator.
How do I configure the window watchdog timing on MAX6752KA29+T?
Configure the window watchdog on MAX6752KA29+T by connecting a capacitor (CSWT) between pin 3 (SWT) and GND to set the slow watchdog period (tWD2), then strapping pins 2 (SET0) and 6 (SET1) to VCC or GND to select the tWD1/tWD2 ratio (8×, 16×, or 64×). For example, tying both SET0 and SET1 low yields tWD1 = tWD2/8. No external components are needed for ratio selection-only logic levels.
Does MAX6752KA29+T support dual-voltage monitoring?
Yes, MAX6752KA29+T supports dual-voltage monitoring: it monitors VCC against its fixed 2.925V threshold and simultaneously monitors an external voltage via the RESET IN pin using a 1.235V internal reference. Connect an external resistor divider to RESET IN to set a second threshold (e.g., for a 5V or 3.3V auxiliary rail), enabling independent fault detection on two power domains.
What is the maximum supply voltage rating for MAX6752KA29+T?
The absolute maximum supply voltage for MAX6752KA29+T is +6.0V applied between VCC and GND, per the Absolute Maximum Ratings table. However, the recommended operating range is 1.2V to 5.5V. Operating above 5.5V risks permanent damage, and functionality is not guaranteed outside the specified 1.2–5.5V range-even if below the 6.0V absolute limit.
Is MAX6752KA29+T pin-compatible with other devices in the MAX6746–MAX6753 family?
MAX6752KA29+T shares the same 8-pin SOT23 package and pinout as MAX6753KA29+T and MAX6750/MAX6751 variants, but differs from MAX6746–MAX6749 which use MR instead of SET0/SET1. Pin compatibility exists only within the MAX6752/MAX6753 subgroup (SET0/SET1 interface) and does not extend to manual-reset or standard-watchdog variants-PCB layout must match the specific functional pin assignment.
MAX6752KA29+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:
- -
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.925V
- 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
MAX6752KA29+T FAQ
1.How can I place an order for MAX6752KA29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6752KA29+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 MAX6752KA29+T reliable?
The price and inventory of MAX6752KA29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6752KA29+T is usually 5 days.
3.What payment methods are accepted for MAX6752KA29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6752KA29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6752KA29+T?
MAX6752KA29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6752KA29+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 MAX6752KA29+T?
For technical support, including MAX6752KA29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6752KA29+T requirements.
6.How does Aetrix verify that MAX6752KA29+T is sourced from the original manufacturer or authorized distributors?
All MAX6752KA29+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 MAX6752KA29+T meets industry standards.
7.What is the process for return or replacement of MAX6752KA29+T?
All MAX6752KA29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6752KA29+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 MAX6752KA29+T part is unused and in its original packaging.
Return procedure for MAX6752KA29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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