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Analog Devices Inc./Maxim Integrated MAX6753KA31
- Part No.:
- MAX6753KA31
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6753KA31.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:44,446
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Product details
Overview
MAX6753KA31 from Maxim Integrated is a window watchdog supervisory IC for automotive-grade microprocessor monitoring, featuring factory-trimmed 3.075V ±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 is used in engine control units and ADAS domain controllers requiring fail-safe power-on reset and windowed watchdog fault detection.
For engineers reviewing the MAX6753KA31 datasheet, MAX6753KA31 pinout, MAX6753KA31 application, or MAX6753KA31 equivalent, key selection criteria include its dual-window watchdog architecture (tWD1/tWD2), SOT23-8 automotive package (-40°C to +125°C), push-pull/open-drain RESET output option, manual reset input compatibility, and 3.7µA supply current at VCC ≤ 2.0V.
Technical Context
The MAX6753KA31 implements a min/max (window) watchdog timer that asserts RESET when WDI falling edges occur either faster than tWD1 (fast fault) or slower than tWD2 (slow fault), with tWD2 set by external capacitor CSWT and tWD1 selected via SET0/SET1 logic states (8×, 16×, or 64× ratio). It monitors VCC only - not RESET IN - and lacks MR pin support.
Its reset function uses a factory-trimmed 3.075V threshold (suffix "31" per Table 2), ±2% accuracy over -40°C to +125°C, with 0.8% hysteresis and immunity to transients ≤50µs at 100mV overdrive. The SRT pin sets reset timeout via external capacitor; no internal fixed delay is present.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 3.075V ±2% - factory-trimmed VCC monitor threshold for brownout detection |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V - enables ultra-low-power battery-backed operation |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive applications |
| Reset Timeout | Adjustable via CSRT capacitor: tRP = 5.06 × 10⁶ × CSRT (e.g., 100pF → 0.506ms) |
| Slow Watchdog Period | tWD2 = 0.65 × 10⁹ × CSWT (e.g., 1500pF → 975ms typ) - defines upper fault boundary |
| Fast Watchdog Period | tWD1 = tWD2 / ratio (8/16/64) - defines lower fault boundary; ratio set by SET0/SET1 pins |
| RESET Output Type | Push-pull or open-drain active-low - supports direct µP reset input or level-shifted interfacing |
Pinout & Package
MAX6753KA31 is housed in an 8-pin SOT23 package (3.0mm × 1.7mm × 1.3mm), lead-free compliant, rated for automotive temperature range (-40°C to +125°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | Not connected / NC | Pin is unused on MAX6753; device monitors VCC only, not external voltage divider |
| 2 - SWT | Slow Watchdog Timeout Input | Capacitor-to-ground sets tWD2; determines upper window boundary of watchdog timing |
| 3 - SRT | Reset Timeout Input | Capacitor-to-ground sets tRP; controls duration RESET remains asserted after fault clearance |
| 4 - GND | Ground Reference | Primary return path for all internal circuits and external capacitor connections |
| 5 - SET1 | Watchdog Window Ratio Select | Logic input (HIGH/LOW) selecting tWD1 ratio relative to tWD2: HIGH/LOW = watchdog disabled |
| 6 - WDI | Watchdog Input | Falling-edge-triggered; valid transitions must fall within tWD1–tWD2 window to avoid RESET assertion |
| 7 - RESET | Active-Low Reset Output | Push-pull or open-drain output driving µP reset pin; guaranteed valid for VCC ≥ 1V |
| 8 - VCC | Supply Voltage Input | Power source and monitored rail; operates from 1.2V to 5.5V; reset triggered if VCC < 3.075V |
Key Features
| Feature | Design Value |
|---|---|
| Window Watchdog Architecture | Detects both fast (tWDI < tWD1) and slow (tWDI > tWD2) processor faults - prevents runaway and lockup |
| Capacitor-Adjustable Timing | Independent tuning of reset timeout (SRT) and slow watchdog period (SWT) enables precise system-level timing alignment |
| Automotive Temperature Range | Full -40°C to +125°C operation with ±2% reset threshold stability - meets AEC-Q100 stress requirements |
| Ultra-Low Supply Current | 3.7µA at VCC ≤ 2.0V - extends battery life in always-on vehicle subsystems (e.g., telematics, gateway) |
| Transient Immunity | Rejects VCC glitches ≤50µs at 100mV overdrive - prevents spurious resets during load-dump or cranking events |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Real-time monitoring of MCU supply during cold-cranking and load-dump transients in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Supervisory IC asserting hardware reset when VCC drops below 3.075V or WDI violates tWD1/tWD2 window due to firmware hang. Use Value: Prevents unsafe engine operation by forcing controlled restart before invalid actuator commands are issued. |
Use Scenario: Fault detection in camera/radar fusion processors where timing violations indicate sensor sync loss or algorithm failure. IC Role / Device Role / Timing Role: Window watchdog enforcing strict execution timing bounds on safety-critical perception stacks. Use Value: Enables ASIL-B compliance by detecting both premature and delayed task completion in ISO 26262 workflows. |
| Automotive Gateway Controller | Vehicle Telematics Module |
Use Scenario: Ensuring reliable boot sequence and runtime integrity of multi-core SoC managing CAN/FlexRay/Ethernet communication. IC Role / Device Role / Timing Role: Dual-role supervisor providing VCC brownout reset and windowed watchdog for main application core. Use Value: Eliminates need for separate reset IC and external watchdog, reducing BOM count and PCB area in space-constrained gateways. |
Use Scenario: Maintaining uptime in LTE-connected modules operating from vehicle battery with intermittent ignition cycles. IC Role / Device Role / Timing Role: Low-current (3.7µA) supervisor enabling long-term sleep mode while retaining full watchdog coverage. Use Value: Extends backup battery life beyond 10 years without compromising fault detection capability during parked state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6752KA31 | Identical pinout, same 3.075V threshold, but lacks SET1 pin - only supports fixed 8×/16×/64× tWD1 ratios via SET0 alone | Reduced watchdog configuration flexibility; unsuitable where independent SET0/SET1 control is required for dynamic mode switching | Select MAX6752KA31 only if design uses static watchdog window and requires cost-optimized variant |
| TLV809E31DBVR | Single-voltage reset IC only (no watchdog); 3.08V threshold; 0.9µA supply current; SOT23-3 package | No window watchdog capability; cannot detect fast/slow processor faults - only provides basic power-on reset | Choose TLV809E31DBVR only for non-safety-critical applications where watchdog functionality is handled externally or omitted |
Compared with MAX6753KA31, MAX6752KA31 offers identical supervision but reduced configurability, while TLV809E31DBVR eliminates watchdog entirely - making MAX6753KA31 the sole choice for ASIL-compliant windowed fault detection in automotive control units.
Availability
MAX6753KA31 is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, automotive gateways, and telematics modules requiring stable component supply across extended automotive lifecycles.
Supply support for MAX6753KA31 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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX6746–MAX6753 family delivers capacitor-adjustable reset and window watchdog supervision specifically for automotive microcontroller systems requiring high reliability and transient immunity under harsh electrical conditions.
FAQ
What is the exact reset threshold voltage of MAX6753KA31?
The MAX6753KA31 features a factory-trimmed VCC reset threshold of 3.075V with ±2% tolerance over -40°C to +125°C, as defined by the "31" suffix per Maxim's Table 2. This value is laser-trimmed during production and does not require external resistor networks - unlike adjustable variants such as MAX6748–MAX6751.
Does MAX6753KA31 support manual reset (MR) functionality?
No, MAX6753KA31 does not include a manual reset (MR) input. Pin 1 is designated RESET IN but is unused on this variant - the MAX6753 monitors VCC only. Manual reset capability is available only on MAX6746/MAX6747 (which feature dedicated MR pins) and can be implemented externally on MAX6748–MAX6751 via switch-to-ground on RESET IN.
How is the window watchdog timeout configured on MAX6753KA31?
The MAX6753KA31 uses two independent timing elements: slow watchdog period tWD2 is set by capacitor CSWT on SWT pin (tWD2 = 0.65 × 10⁹ × CSWT), while fast watchdog period tWD1 is selected via logic states on SET0 and SET1 pins - offering 8×, 16×, or 64× ratios relative to tWD2. No WDS pin is present; extended-mode watchdog (128×) applies only to MAX6746–MAX6751.
What package type and environmental rating does MAX6753KA31 have?
MAX6753KA31 is supplied in an 8-pin SOT23 package (3.0mm × 1.7mm footprint) with lead-free finish, fully specified over the automotive temperature range of -40°C to +125°C. It carries the "/V" automotive qualification suffix in ordering codes (e.g., MAX6753KA31/V+T) and meets AEC-Q100 stress test requirements.
Can MAX6753KA31 monitor an external voltage like RESET IN?
No, MAX6753KA31 monitors VCC only and does not support external voltage monitoring via RESET IN. Pin 1 (RESET IN) is not connected internally - the device lacks the adjustable comparator circuitry found in MAX6748–MAX6751. For dual-rail monitoring (VCC + external VMON), MAX6750/MAX6751 with both factory-trimmed and adjustable thresholds must be selected instead.
MAX6753KA31 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:
- 3.075V
- Output:
- Open Drain or Open Collector
- 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
MAX6753KA31 FAQ
1.How can I place an order for MAX6753KA31 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6753KA31 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 MAX6753KA31 reliable?
The price and inventory of MAX6753KA31 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6753KA31 is usually 5 days.
3.What payment methods are accepted for MAX6753KA31?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6753KA31 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6753KA31?
MAX6753KA31 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6753KA31 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 MAX6753KA31?
For technical support, including MAX6753KA31 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6753KA31 requirements.
6.How does Aetrix verify that MAX6753KA31 is sourced from the original manufacturer or authorized distributors?
All MAX6753KA31 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 MAX6753KA31 meets industry standards.
7.What is the process for return or replacement of MAX6753KA31?
All MAX6753KA31 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6753KA31, 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 MAX6753KA31 part is unused and in its original packaging.
Return procedure for MAX6753KA31:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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