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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:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:1,589
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Product details
Overview
The MAX6752KA46 from Maxim Integrated is a capacitor-adjustable microprocessor supervisory circuit with window watchdog timer, factory-trimmed 4.625V VCC reset threshold (±2%), 3.7µA supply current, and automotive-grade operation from -40°C to +125°C. It monitors single-supply VCC, asserts active-low RESET for programmable timeout after fault clearance, and detects out-of-window WDI transitions to prevent runaway or stalled processor behavior in safety-critical embedded systems.
For engineers reviewing the MAX6752KA46 datasheet, MAX6752KA46 pinout, MAX6752KA46 application, or MAX6752KA46 equivalent, this device supports precise dual-fault detection (fast/slow watchdog), adjustable reset timing via SRT capacitor, robust power-supply transient immunity, and push-pull RESET output compatible with µP reset inputs down to VCC = 1V.
Technical Context
The MAX6752KA46 implements a min/max (windowed) watchdog architecture: it triggers RESET when WDI falling edges occur faster than tWD1 (fast fault) or slower than tWD2 (slow fault), with tWD1 selectable via SET0/SET1 pinstrapping (8×, 16×, or 64× ratio relative to tWD2). The slow watchdog period tWD2 is set by CSWT using tWD2 = 0.65 × 10⁹ × CSWT (seconds).
Reset timeout tRP is independently adjustable via CSRT using tRP = 5.06 × 10⁶ × CSRT (seconds), and VCC monitoring uses a ±2% factory-trimmed 4.625V threshold. The device operates with guaranteed RESET validity for VCC ≥ 1V and features 200ns MR-to-RESET delay and 100ns glitch rejection on manual reset input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.625V ±2% - factory-trimmed precision voltage for reliable brownout detection at nominal 4.6V rail |
| Supply Current | 3.7µA at VCC ≤ 2.0V - ultra-low quiescent current enabling battery-powered and always-on monitoring |
| Reset Timeout Range | 0.506ms to 9.487ms - set by 100pF–1500pF capacitor on SRT pin, covering µP initialization durations |
| Slow Watchdog Period (tWD2) | 64.77ms to 1214.4ms - set by 100pF–1500pF capacitor on SWT pin, defining maximum allowable WDI interval |
| Fast Watchdog Period (tWD1) | 1.01ms to 75.89ms - selectable via SET0/SET1 (8×/16×/64× tWD2 ratio), defining minimum allowable WDI interval |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive, industrial control, and harsh-environment applications |
| RESET Output Type | Push-pull active-low - eliminates external pullup, ensures clean logic-level assertion without I²C bus contention |
Pinout & Package
MAX6752KA46 is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts in automotive and portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SET0 | Watchdog window ratio select input | Logic input that, with SET1, configures tWD1/tWD2 ratio (8×, 16×, or 64×); HIGH/LOW disables watchdog |
| 2 - SET1 | Watchdog window ratio select input | Second logic input for tWD1 ratio selection; used with SET0 per Table 1; HIGH/LOW disables watchdog |
| 3 - GND | Ground reference | Primary return path for internal comparators, timers, and RESET driver; must be low-impedance |
| 4 - VCC | Power supply input | Monitored supply rail (1.2V–5.5V); powers internal circuitry and enables VCC reset threshold detection |
| 5 - RESET | Active-low reset output | Push-pull driver asserting low for tRP after fault; directly interfaces µP reset pin without pullup resistor |
| 6 - SWT | Slow watchdog timeout capacitor input | Connects to ground via CSWT to set tWD2; determines upper bound of valid WDI pulse interval |
| 7 - SRT | Reset timeout capacitor input | Connects to ground via CSRT to set tRP; defines duration RESET remains asserted post-fault clearance |
| 8 - WDI | Watchdog input | Falling-edge-sensitive input; pulses outside tWD1–tWD2 window force RESET assertion for tRP |
Key Features
| Feature | Design Value |
|---|---|
| Window watchdog timer | Detects both fast (stuck-loop) and slow (stalled) processor faults via dual time-window enforcement on WDI |
| Capacitor-adjustable timing | Independent SRT and SWT pins enable precise, board-level tuning of reset and watchdog timeouts without firmware changes |
| Factory-trimmed VCC threshold | 4.625V ±2% threshold eliminates external resistor divider, reduces BOM count, and improves accuracy over temperature |
| Automotive temperature range | Guaranteed operation from -40°C to +125°C meets AEC-Q100 stress test requirements for engine control units |
| Ultra-low supply current | 3.7µA at VCC ≤ 2.0V enables multi-year battery life in remote sensors and always-on monitoring nodes |
| Power-supply transient immunity | Rejects <50µs transients 100mV below VTH, preventing spurious resets during switching noise or load dump events |
Applications
| Engine Control Unit (ECU) | Industrial PLC Controller |
|---|---|
Use Scenario: Monitors 5V microcontroller supply and validates software execution timing in diesel injection control. IC Role / Device Role / Timing Role: Window watchdog enforces strict instruction cycle timing; VCC supervision prevents brownout-induced code corruption. Use Value: Prevents unsafe actuator activation due to processor lockup or undervoltage, meeting ISO 26262 ASIL-B functional safety requirements. |
Use Scenario: Supervises dual-voltage rails (3.3V logic, 24V I/O) in modular automation controllers with long firmware boot sequences. IC Role / Device Role / Timing Role: Adjustable tRP accommodates extended FPGA configuration time; push-pull RESET ensures deterministic deassertion timing. Use Value: Eliminates need for discrete RC reset networks and external watchdog ICs, reducing system footprint and qualification effort. |
| Medical Infusion Pump | Telematics Control Unit (TCU) |
Use Scenario: Ensures fail-safe shutdown if main µP fails to service watchdog within calibrated intervals during drug delivery. IC Role / Device Role / Timing Role: Fast/slow fault detection distinguishes between transient glitches and persistent hardware failure. Use Value: Enables Class III medical device compliance by guaranteeing safe state transition upon detected processor anomaly. |
Use Scenario: Monitors LTE modem power rail and validates host processor responsiveness during OTA firmware updates. IC Role / Device Role / Timing Role: Factory-trimmed 4.625V threshold matches typical automotive 5V supply tolerance; tWD2 set to 500ms covers update handshake latency. Use Value: Maintains cellular connectivity integrity during critical firmware operations without requiring host CPU intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6753KA46 | Same 4.625V VCC threshold and window watchdog, but open-drain RESET output instead of push-pull | Requires external pullup; suitable for level-shifting or wired-AND reset bus configurations | Select MAX6753KA46 only when interfacing to mixed-voltage systems or shared reset lines where open-drain behavior is required |
| TPS3808G33 | Fixed 3.3V reset threshold, no window watchdog; offers 200ms fixed reset timeout and 2% threshold accuracy | Lacks adjustable timing and dual-fault detection; intended for simpler single-rail monitoring without software timing validation | Choose TPS3808G33 for cost-sensitive, non-safety-critical applications where only basic VCC supervision is needed |
Compared with MAX6752KA46, MAX6753KA46 provides identical supervision functionality but requires external pullup for RESET, while TPS3808G33 sacrifices window watchdog capability and adjustable timing for lower unit cost and simpler integration in fixed-threshold systems.
Availability
MAX6752KA46 is available at Aetrix Electronics and suitable for automotive engine control, industrial PLCs, medical infusion pumps, and telematics control units 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 high-performance analog and mixed-signal ICs for demanding applications in automotive, industrial, and communications markets.
The MAX6746–MAX6753 family delivers capacitor-adjustable reset and watchdog supervision with automotive-grade reliability, targeting safety-critical µP monitoring where precise timing control and fault discrimination are essential.
FAQ
What is the factory-trimmed reset threshold voltage for MAX6752KA46?
The MAX6752KA46 has a factory-trimmed VCC reset threshold of 4.625V with ±2% accuracy over -40°C to +125°C. This value is confirmed in Table 2 of the datasheet under suffix "46", and applies specifically to the VCC monitor path-not the adjustable RESET IN input, which is not implemented in the MAX6752 variant.
How does the window watchdog function in MAX6752KA46 differ from standard watchdog timers?
The MAX6752KA46 implements a true window watchdog: it asserts RESET if WDI falling edges occur either too soon (faster than tWD1) or too late (slower than tWD2). Unlike single-timeout watchdogs, this prevents both runaway loops and complete processor stalls, providing higher fault coverage for safety-critical applications.
Can MAX6752KA46 monitor two supply voltages simultaneously?
No. The MAX6752KA46 monitors only the VCC supply using its factory-trimmed 4.625V threshold. Dual-voltage monitoring (e.g., VCC and an external rail) is supported only by MAX6750/MAX6751 variants, which include both factory-trimmed and adjustable RESET IN inputs-capabilities absent in MAX6752KA46.
What is the minimum VCC required for guaranteed RESET output validity in MAX6752KA46?
The MAX6752KA46 guarantees correct RESET logic state for VCC ≥ 1V. Below 1V, sinking capability degrades; for applications requiring valid RESET down to 0V, a 100kΩ pulldown resistor between RESET and GND is recommended per the datasheet's Figure 7 guidance.
How do I configure the fast watchdog timeout (tWD1) on MAX6752KA46?
tWD1 is configured by pinstrapping SET0 and SET1: LOW/LOW = 8× tWD2, LOW/HIGH = 16× tWD2, HIGH/HIGH = 64× tWD2. tWD2 itself is set by CSWT on the SWT pin. To disable the watchdog entirely, connect SET0 to VCC and SET1 to GND per Table 1 in the datasheet.
MAX6752KA46 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:
- 4.625V
- 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
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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