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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 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,794
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Product details
Overview
The MAX6752KA23+ from Analog Devices is a window watchdog supervisory IC for microprocessor systems, featuring factory-trimmed 3.2V VCC reset threshold (±2%), capacitor-adjustable reset timeout (5.7–9.5ms), and dual-window watchdog with fast/slow fault detection (tWD1 = 11.4–15.2ms / tWD2 = 729–1214ms at CSWT = 1500pF). It operates from 1.2V to 5.5V supply and supports automotive-grade operation from –40°C to +125°C in an 8-pin SOT23 package, used in battery-powered controllers and critical μP monitoring.
For engineers reviewing the MAX6752KA23+ datasheet, MAX6752KA23+ pinout, MAX6752KA23+ application, or MAX6752KA23+ equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior under temperature and voltage variation, and validated alternative options for window watchdog supervision in automotive and portable embedded systems.
Technical Context
The MAX6752KA23+ implements a min/max (windowed) 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 fixed 3.2V VCC reset threshold is factory-trimmed to ±2% over –40°C to +125°C, and RESET remains valid down to VCC ≥ 1V.
Reset timeout (tRP) and slow watchdog period (tWD2) are independently set by external capacitors on SRT and SWT pins using linear scaling formulas: tRP = 4.94×10⁶ × CSRT and tWD2 = 0.65×10⁹ × CSWT. The device uses internal ramp comparators (SRT/SWT thresholds at 1.235V, 250nA ramp current) and guarantees immunity to transients ≤50µs at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.200V ±2% (factory-trimmed; ensures reliable brownout detection at nominal 3.3V rail) |
| Supply Current | 3.7–10µA (enables >10-year battery life in always-on portable controllers) |
| Reset Timeout Range | 5.7–9.5ms (set by 100–1500pF capacitor on SRT; covers typical μP power-up sequences) |
| Slow Watchdog Period (tWD2) | 729–1214ms (set by 100–1500pF capacitor on SWT; defines upper fault boundary) |
| Fast Watchdog Period (tWD1) | 11.4–15.2ms (at CSWT = 1500pF, SET0/SET1 = low/low; defines lower fault boundary) |
| Operating Temperature | –40°C to +125°C (AEC-Q100 qualified; supports under-hood automotive deployment) |
| Package | 8-pin SOT23 (2.9mm × 1.6mm footprint; enables high-density PCB layout) |
Pinout & Package
MAX6752KA23+ is housed in an 8-pin SOT23 package (Outline 21-0078, Land Pattern 90-0176), RoHS-compliant, with thermal resistance θJA = 196°C/W on four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | Adjustable reset comparator input | High-impedance node (±1nA leakage); connects to resistor divider for dual-voltage monitoring (not used in MAX6752KA23+ due to fixed VCC threshold) |
| 2 - SET0 | Watchdog window ratio select | Logic input: low = enable tWD1 selection; high = disable watchdog or select 64× ratio (per Table 1) |
| 3 - SWT | Slow watchdog timeout capacitor terminal | Connects to ground via CSWT (100–1500pF); sets tWD2 = 0.65×10⁹ × CSWT (seconds) |
| 4 - SRT | Reset timeout capacitor terminal | Connects to ground via CSRT (100–1500pF); sets tRP = 4.94×10⁶ × CSRT (seconds) |
| 5 - GND | Power ground reference | Return path for all internal circuits; must be low-impedance connection to system ground plane |
| 6 - SET1 | Watchdog window ratio select | Logic input: low = select 8× or 16× tWD2/tWD1 ratio; high = select 64× or disable (per Table 1) |
| 7 - RESET | Active-low reset output | Push-pull configuration; drives μP reset pin directly; valid logic state guaranteed for VCC ≥ 1V |
| 8 - VCC | Main supply input | Accepts 1.2–5.5V; powers internal circuitry and provides reference for fixed 3.2V reset threshold |
Key Features
| Feature | Design Value |
|---|---|
| Window watchdog timer | Detects both fast (tWDI < tWD1) and slow (tWDI > tWD2) WDI transitions-prevents runaway code and stuck states missed by standard watchdogs |
| Capacitor-adjustable timing | Independent tuning of reset timeout (SRT) and slow watchdog period (SWT) enables precise alignment with μP boot time and software loop intervals |
| Factory-trimmed 3.2V threshold | ±2% accuracy over –40°C to +125°C eliminates need for external resistor network and improves system reliability vs. adjustable variants |
| AEC-Q100 qualification | Validated for automotive applications including engine control modules and ADAS sensors requiring extended temperature and lifetime stability |
| Ultra-low supply current | 3.7µA typical at VCC ≤ 2.0V enables use in energy-harvesting and coin-cell-powered IoT edge nodes |
Applications
| Automotive Engine Control Unit (ECU) | Battery-Powered Medical Monitor |
|---|---|
|
Use Scenario: ECU microcontroller must recover from transient voltage sags during cold-cranking or load-dump events without false resets. IC Role / Device Role / Timing Role: MAX6752KA23+ monitors 3.3V domain and enforces windowed watchdog supervision on main CPU clock domain to detect firmware hangs or timing violations. Use Value: Immunity to 50µs/100mV transients prevents spurious resets; window watchdog catches both stuck loops and premature wakeups missed by single-timeout watchdogs. |
Use Scenario: Portable glucose meter runs on CR2032 battery and requires guaranteed reset assertion during deep discharge (<1.8V). IC Role / Device Role / Timing Role: MAX6752KA23+ provides VCC-supervised reset with 3.2V threshold and ultra-low ICC (3.7µA) to extend battery life while ensuring safe shutdown before brownout. Use Value: Valid RESET output down to VCC = 1V prevents undefined μP state; push-pull output drives reset pin without external pullup, saving BOM cost and board space. |
| Industrial PLC I/O Module | Smart Energy Meter |
|
Use Scenario: PLC module operates in harsh industrial environments with EMI-induced glitches on power and signal lines. IC Role / Device Role / Timing Role: MAX6752KA23+ serves as primary supervisor for ARM Cortex-M7 core, using window watchdog to validate deterministic task scheduling across multiple RTOS threads. Use Value: Dual-window detection identifies both software lockups (slow fault) and interrupt storm conditions (fast fault); AEC-Q100 rating ensures long-term reliability at 125°C ambient. |
Use Scenario: Revenue-grade meter must maintain accurate timekeeping and secure firmware execution during grid voltage fluctuations. IC Role / Device Role / Timing Role: MAX6752KA23+ supervises the meter's secure MCU, asserting reset if WDI pulses deviate from expected 100ms window (tWD1 = 12.2ms, tWD2 = 975ms). Use Value: Capacitor-tuned tRP (7.6ms) matches flash programming sequence; ±2% VTH tolerance ensures consistent reset point across 20-year product lifecycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar window watchdog supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6753KA23+ | Identical electrical specs and pinout, but features open-drain RESET output instead of push-pull | Suitable where level-shifting to higher-voltage logic (e.g., 5V μP reset input) is required | Select MAX6753KA23+ only when external pullup is needed; otherwise MAX6752KA23+ reduces component count |
| TPS3808G33DBVR | Fixed 3.3V reset threshold (±0.5%), no window watchdog; only basic timeout watchdog (single-period) | Applicable where simple reset + watchdog suffices, but cannot detect fast-fault conditions | Choose TPS3808G33DBVR for cost-sensitive designs lacking window-fault requirements; MAX6752KA23+ adds critical safety coverage |
Compared with MAX6753KA23+, the MAX6752KA23+ offers direct-drive reset capability without external components; compared with TPS3808G33DBVR, it provides superior functional safety through dual-boundary watchdog detection essential for ASIL-B systems.
Availability
MAX6752KA23+ is available at Aetrix Electronics and suitable for automotive ECUs, portable medical devices, and industrial PLC modules requiring stable component supply with guaranteed long-term availability and AEC-Q100 compliance.
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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision timing, power management, and sensor solutions.
The MAX6746–MAX6753 family was designed specifically for robust microprocessor supervision in safety-critical embedded systems, emphasizing transient immunity, wide temperature operation, and flexible watchdog architectures beyond basic timeout functionality.
FAQ
What is the exact reset threshold voltage of the MAX6752KA23+ and how is it trimmed?
The MAX6752KA23+ has a factory-trimmed VCC reset threshold of 3.200V with ±2% tolerance over –40°C to +125°C. This value is laser-trimmed during wafer test and verified per Table 2 (suffix "23" = 3.200V typ). No external resistors are needed, and the threshold remains stable across temperature and supply voltage variations, eliminating calibration overhead in production.
How does the window watchdog function differ between MAX6752KA23+ and standard watchdog ICs like MAX6746?
The MAX6752KA23+ implements a true min/max watchdog: it asserts RESET if WDI falling edges occur either faster than tWD1 (fast fault) or slower than tWD2 (slow fault). In contrast, the MAX6746 only detects slow faults (no tWD1 boundary). This dual-boundary detection prevents both runaway loops and interrupt storms-critical for functional safety in automotive and medical applications.
Can the MAX6752KA23+ monitor two supply rails simultaneously, such as VCC and a 1.8V core voltage?
No-the MAX6752KA23+ monitors only the VCC supply using its fixed 3.2V threshold. It lacks the RESET IN pin functionality found in MAX6748–MAX6751 for external voltage monitoring. To supervise dual rails, use MAX6750KA23+ (which combines fixed 3.2V VCC monitoring and adjustable RESET IN input) or pair MAX6752KA23+ with a dedicated 1.8V supervisor like MAX6315US29D3+.
What capacitor values are recommended for achieving a 100ms slow watchdog period (tWD2) with the MAX6752KA23+?
To achieve tWD2 = 100ms, solve tWD2 = 0.65×10⁹ × CSWT → CSWT = 100×10⁻³ / 0.65×10⁹ = 154pF. Use a 150pF ±5% C0G ceramic capacitor (low leakage, <10nA) placed close to the SWT pin with short traces. Avoid X7R types due to DC bias and temperature drift effects on timing accuracy.
Is the MAX6752KA23+ pin-compatible with other members of the MAX6746–MAX6753 family, such as MAX6750?
No-MAX6752KA23+ uses the SET0/SET1 pin configuration (pins 2 and 6) for window watchdog ratio selection, whereas MAX6750 uses RESET IN (pin 1) and lacks SET0/SET1. Pin mapping differs across subfamilies: MAX6752/MAX6753 have SET0/SET1 on pins 2/6; MAX6746–MAX6751 have WDS on pin 5; MAX6748–MAX6751 use RESET IN on pin 1. PCB layout is not interchangeable.
MAX6752KA23+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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+ 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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