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Analog Devices Inc./Maxim Integrated MAX6753KA26+
- Part No.:
- MAX6753KA26+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6753KA26+.pdf
- Description:
- MAX6753 UP RESET CKT W/CAPACITOR
- Quantity:
- Payment:
- Shipping:
Inventory:1,322
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Product details
Overview
MAX6753KA26+ from Maxim Integrated is a window watchdog supervisory IC for automotive and industrial microprocessor systems, featuring factory-trimmed 2.625V ±2% VCC reset threshold, capacitor-adjustable slow/fast watchdog timeouts (tWD2/tWD1), push-pull active-low RESET output, and guaranteed RESET validity down to VCC ≥ 1V. It monitors single supply voltage and detects processor activity outside defined timing windows in battery-powered controllers.
For engineers reviewing the MAX6753KA26+ datasheet, MAX6753KA26+ pinout, MAX6753KA26+ application, or MAX6753KA26+ equivalent, this page delivers verified electrical parameters, SOT23-8 terminal mapping, window watchdog timing behavior, automotive-grade temperature operation (-40°C to +125°C), and real-world substitution guidance - all confirmed against Maxim's official documentation.
Technical Context
The MAX6753KA26+ implements a dual-threshold window watchdog timer that asserts 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). It does not support extended-mode watchdog (WDS input absent) and lacks manual reset (MR) or adjustable RESET IN inputs.
Reset timeout (tRP) and slow watchdog period (tWD2) are set independently using external capacitors on SRT and SWT pins, respectively, with tRP = 5.06 × 10⁶ × CSRT (seconds) and tWD2 = 0.65 × 10⁹ × CSWT (seconds). The device operates across 1.2V–5.5V VCC and draws only 3.7µA typical supply current at VCC ≤ 2.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.625V ±2% (factory-trimmed; enables precise brownout detection at 2.6V nominal rail) |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V (enables multi-year operation in battery-backed systems) |
| Operating Temperature | -40°C to +125°C (fully specified for under-hood automotive and industrial control environments) |
| Reset Timeout Range | 0.506ms to 9.487ms (adjustable via 100pF–1500pF capacitor on SRT pin) |
| Slow Watchdog Period | 64.77ms to 1214.4ms (set by 100pF–1500pF capacitor on SWT pin) |
| Fast Watchdog Period | 1.01ms to 75.89ms (selectable via SET0/SET1; e.g., 4.05ms at CSWT = 100pF, SET Ratio = 16) |
| RESET Output Type | Push-pull active-low (drives µP reset pin directly without external pull-up; VOL ≤ 0.4V at 3.2mA sink) |
Pinout & Package
MAX6753KA26+ is housed in an 8-pin SOT23-8 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained automotive PCBs and industrial modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SET0 | Watchdog window ratio select input | Logic input (HIGH = VCC, LOW = GND) that configures fast watchdog period ratio (8×, 16×, or 64× relative to tWD2) |
| 2 - SET1 | Watchdog window ratio select input | Second logic input used with SET0 to define tWD1/tWD2 ratio per Table 1; HIGH/LOW disables watchdog |
| 3 - GND | Ground reference | Primary return path for internal circuitry and capacitor biasing (SRT/SWT must connect to this node) |
| 4 - VCC | Power supply input | Monitored supply rail (1.2V–5.5V); powers internal comparators, timers, and RESET driver |
| 5 - RESET | Active-low reset output | Push-pull driver asserted low during VCC brownout, watchdog fault, or power-on reset; valid for VCC ≥ 1V |
| 6 - SWT | Slow watchdog timeout capacitor terminal | Connects to ground via low-leakage capacitor (100pF–1500pF) to set tWD2; defines lower bound of window |
| 7 - SRT | Reset timeout capacitor terminal | Connects to ground via low-leakage capacitor (100pF–1500pF) to set tRP; independent of watchdog timing |
| 8 - WDI | Watchdog input | Falling-edge-triggered input; faults if edge spacing falls outside tWD1–tWD2 window; ignored while RESET is asserted |
Key Features
| Feature | Design Value |
|---|---|
| Window watchdog timer | Detects both fast (tWDI < tWD1) and slow (tWDI > tWD2) processor faults - critical for safety-critical firmware validation |
| Capacitor-adjustable timing | Independent tuning of reset timeout (SRT) and slow watchdog period (SWT) enables precise alignment with µP boot/firmware cycles |
| Automotive-grade operation | Full -40°C to +125°C specification ensures reliability in engine control units, ADAS sensors, and powertrain modules |
| Low quiescent current | 3.7µA typical at 1.8V supports >10-year battery life in always-on telematics and remote monitoring nodes |
| Push-pull RESET output | Eliminates need for external pull-up resistor; simplifies BOM and improves noise immunity in high-EMI vehicle environments |
Applications
| Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply and validates firmware execution timing in diesel ECU. IC Role / Device Role / Timing Role: Window watchdog enforces strict instruction cycle timing; asserts RESET if bootloader hangs or sensor polling stalls. Use Value: Prevents undetected runaway code that could cause uncommanded throttle actuation or emission system failure. |
Use Scenario: Supervises ARM Cortex-M7 in modular PLC base unit operating at 2.5V with 100ms firmware watchdog interval. IC Role / Device Role / Timing Role: Uses SET0/SET1 to configure 64× tWD2 ratio, achieving 64ms fast fault detection window aligned to deterministic scan cycle. Use Value: Enables SIL-2 compliant fail-safe response within 120ms total fault-to-reset latency. |
| Battery Management System (BMS) | Smart Sensor Node |
Use Scenario: Guards TI MSP430-based BMS controller powered from 2.6V LDO; monitors cell voltage supervisor IC communication. IC Role / Device Role / Timing Role: Factory-trimmed 2.625V threshold matches LDO output; tWD2 set to 500ms to cover full cell balancing sequence. Use Value: Ensures safe shutdown before overvoltage/overcurrent protection latches due to firmware lockup. |
Use Scenario: Supervises Nordic nRF52840 in BLE-enabled environmental sensor with 1.8V coin-cell supply. IC Role / Device Role / Timing Role: Draws only 3.7µA at 1.8V; tRP set to 10ms to hold MCU in reset until LDO stabilizes post-wakeup. Use Value: Extends shelf life beyond 5 years while guaranteeing deterministic cold-start behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6752KA26+ | Identical VCC threshold (2.625V), same SOT23-8 package, but features push-pull RESET and no SET1 pin - uses SET0 only for 8×/16×/64× selection | Lacks SET1 pin; requires different PCB layout if pin compatibility is required; identical window watchdog functionality | Select MAX6752KA26+ only if design already uses SET0-only configuration and board revision allows pin count reduction |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, no window watchdog (standard timeout only), 1.8µA supply current, SOT23-6 package | Suitable for simpler brownout-only supervision where processor timing validation is handled externally or not required | Choose TPS3808G33DBVR for cost-sensitive, non-safety-critical applications lacking window watchdog requirements |
Compared with MAX6753KA26+, MAX6752KA26+ offers identical timing accuracy and threshold but reduced pin count, while TPS3808G33DBVR trades window watchdog capability for lower cost and current - making MAX6753KA26+ the sole choice for ASIL-B–aligned timing supervision.
Availability
MAX6753KA26+ is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, battery management systems, and smart sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6753KA26+ 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 and mixed-signal ICs for demanding industrial, automotive, and communications applications, with emphasis on reliability, low power, and integration.
The MAX6746–MAX6753 family was engineered specifically for automotive-grade microprocessor supervision, delivering capacitor-adjustable window watchdogs and factory-trimmed thresholds to meet ISO 26262 functional safety readiness in ECUs and ADAS subsystems.
FAQ
What is the factory-trimmed reset threshold voltage for MAX6753KA26+?
The MAX6753KA26+ has a factory-trimmed VCC reset threshold of 2.625V ±2% over -40°C to +125°C, corresponding to suffix "26" per Maxim's Table 2. This value is laser-trimmed during production and does not require external resistor networks - enabling direct connection to 2.6V rails in automotive domain controllers and industrial sensors.
Does MAX6753KA26+ support manual reset or adjustable RESET IN monitoring?
No. The MAX6753KA26+ does not include MR (manual reset) or RESET IN pins. Its pinout consists solely of SET0, SET1, GND, VCC, RESET, SWT, SRT, and WDI - confirming it is designed exclusively for VCC-supply monitoring with window watchdog functionality, unlike MAX6746/MAX6747 variants that support manual reset.
How do I configure the fast watchdog timeout (tWD1) on MAX6753KA26+?
Configure tWD1 on MAX6753KA26+ by setting logic levels on SET0 and SET1 pins: LOW/LOW = 8× ratio, LOW/HIGH = 16×, HIGH/HIGH = 64× relative to tWD2 (set by SWT capacitor). For example, with CSWT = 100pF (tWD2 ≈ 64.77ms), LOW/HIGH yields tWD1 ≈ 4.05ms. Connect SET0 HIGH and SET1 LOW to disable the watchdog entirely.
What is the minimum VCC required for valid RESET output operation in MAX6753KA26+?
The MAX6753KA26+ guarantees valid RESET output logic state for VCC ≥ 1V. Below 1V, sinking capability degrades; however, for applications requiring assertion down to 0V, a 100kΩ pulldown resistor on the push-pull RESET pin ensures low-state integrity - a solution validated in Maxim's Figure 7 for MAX6752/MAX6753 devices.
Can MAX6753KA26+ be used in place of MAX6752KA26+?
MAX6753KA26+ and MAX6752KA26+ share identical VCC threshold, timing formulas, and push-pull RESET, but differ in pinout: MAX6753KA26+ includes SET1 (pin 2), while MAX6752KA26+ does not. Substitution requires PCB modification - they are not pin-compatible. Use MAX6753KA26+ only when dual-pin watchdog ratio selection is required.
MAX6753KA26+ 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:
- 2.625V
- Output:
- Open Drain or Open Collector
- 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
MAX6753KA26+ FAQ
1.How can I place an order for MAX6753KA26+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6753KA26+ 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 MAX6753KA26+ reliable?
The price and inventory of MAX6753KA26+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6753KA26+ is usually 5 days.
3.What payment methods are accepted for MAX6753KA26+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6753KA26+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6753KA26+?
MAX6753KA26+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6753KA26+ 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 MAX6753KA26+?
For technical support, including MAX6753KA26+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6753KA26+ requirements.
6.How does Aetrix verify that MAX6753KA26+ is sourced from the original manufacturer or authorized distributors?
All MAX6753KA26+ 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 MAX6753KA26+ meets industry standards.
7.What is the process for return or replacement of MAX6753KA26+?
All MAX6753KA26+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6753KA26+, 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 MAX6753KA26+ part is unused and in its original packaging.
Return procedure for MAX6753KA26+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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