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Analog Devices Inc./Maxim Integrated MAX6750KA26+
- Part No.:
- MAX6750KA26+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6750KA26+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:974
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Product details
Overview
MAX6750KA26+ from Analog Devices is a dual-voltage microprocessor supervisory IC with factory-trimmed 2.625V VCC reset threshold (±2%), adjustable RESET IN monitoring, capacitor-programmable reset timeout (5.7–9.5ms), and standard watchdog timer. It asserts active-low RESET during brownout, power-up, or manual reset, and is AEC-Q100 qualified for automotive systems requiring robust voltage supervision.
For engineers reviewing the MAX6750KA26+ datasheet, MAX6750KA26+ pinout, MAX6750KA26+ application, or MAX6750KA26+ equivalent, this device supports dual-supply monitoring (VCC + external VMON_TH), offers ±2% threshold accuracy over –40°C to +125°C, provides 3.7µA supply current at 2V, and delivers guaranteed RESET validity down to VCC = 1V - critical for low-power embedded controllers and battery-backed systems.
Technical Context
The MAX6750KA26+ integrates two independent reset comparators: one monitors VCC against a factory-trimmed 2.625V threshold (±2%), while the second monitors an externally set voltage via RESET IN using a resistor divider referenced to 1.235V. Its reset timeout period (tRP) and watchdog timeout (tWD) are independently set by capacitors CSRT and CSWT, each scaled by 4.94×10⁶ s/F.
This variant belongs to the MAX6746–MAX6753 family and implements standard (non-windowed) watchdog functionality with WDS-selectable 128× extended mode. It features push-pull RESET output, no manual reset input (MR), and supports dual-voltage monitoring without requiring external logic - enabling simultaneous supervision of core and I/O rails in automotive ECUs and industrial controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.625V ±2% - factory-trimmed for precise brownout detection at nominal 2.6V rail |
| RESET IN Threshold | 1.235V ±0.8% - enables adjustable monitoring of secondary supply via resistor divider |
| Supply Current | 3.7µA at VCC ≤ 2.0V - ultra-low quiescent draw for battery-critical applications |
| Reset Timeout Range | 0.51–9.49ms - programmable via 100pF–1500pF capacitor on SRT pin |
| Watchdog Timeout Range | 0.51–9.49ms (normal) or 64.8–1214ms (extended) - selectable via CSWT and WDS pin |
| Operating Temperature | –40°C to +125°C - fully specified for under-hood automotive environments |
| RESET Output Type | Push-pull active-low - eliminates need for external pullup; drives directly into µP reset input |
Pinout & Package
MAX6750KA26+ is housed in an 8-pin SOT23 package (package code K8+5A), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads optimized for high-density PCB layouts and automotive reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | Adjustable reset comparator input | Accepts external resistor-divider to monitor secondary supply (e.g., 3.3V I/O rail); threshold fixed at 1.235V |
| 2 - GND | Ground reference | Common return path for all internal comparators, timers, and output stage |
| 3 - VCC | Main supply input | Power source and monitored rail; supports 1.2V–5.5V operation with reset asserted below 2.625V |
| 4 - RESET | Active-low reset output | Push-pull driver capable of sinking 1.2mA at 2.7V; asserts low for full tRP after fault clearance |
| 5 - SWT | Watchdog timeout capacitor input | Connects to ground via CSWT to set tWD; WDS pin selects normal/extended mode |
| 6 - SRT | Reset timeout capacitor input | Connects to ground via CSRT to set tRP; timing governed by 4.94×10⁶ × CSRT (seconds) |
| 7 - WDS | Watchdog mode select | Pulled to GND for normal tWD; pulled to VCC for 128× extended timeout; state change clears watchdog timer |
| 8 - WDI | Watchdog input | Falling edge resets watchdog counter; must occur within tWD window or triggers RESET assertion |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneously monitors VCC (2.625V) and external rail (via RESET IN) - eliminates need for second supervisor in multi-rail systems |
| Capacitor-adjustable timing | Independent SRT/CSRT and SWT/CSWT networks allow precise, board-level tuning of reset and watchdog delays without firmware changes |
| AEC-Q100 qualification | Qualified to Grade 0 (–40°C to +125°C) with robust transient immunity - meets automotive reliability requirements out-of-box |
| Push-pull RESET output | Drives µP reset pin directly without pullup resistor; guarantees valid logic state down to VCC = 1V - simplifies BOM and layout |
| Power supply transient immunity | Rejects 50µs transients dipping 100mV below VTH - prevents spurious resets in noisy automotive electrical environments |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Power Management |
|---|---|
Use Scenario: Supervises both 2.6V microcontroller core supply and 3.3V CAN transceiver I/O rail during cold cranking and load dump events. IC Role / Device Role / Timing Role: Dual-comparator supervisor asserting synchronized RESET across domains when either rail falls below threshold. Use Value: Prevents ECU lockup during battery voltage sag by guaranteeing reset pulse ≥5.7ms - longer than µP's internal power-on reset requirement. |
Use Scenario: Monitors 2.6V FPGA configuration supply and 3.3V sensor interface rail in modular I/O chassis operating at 85°C ambient. IC Role / Device Role / Timing Role: Provides independent reset timeout and watchdog supervision with temperature-stable thresholds (±2% over –40°C to +125°C). Use Value: Enables deterministic recovery from brownout without software intervention - critical for SIL-2 compliant safety functions. |
| Battery-Powered Medical Monitor | Smart Energy Meter MCU |
Use Scenario: Ensures reliable startup and runtime supervision of ultra-low-power ARM Cortex-M0+ in portable ECG device powered by coin cell. IC Role / Device Role / Timing Role: Ultra-low ICC (3.7µA at 2V) extends battery life while maintaining accurate 2.625V VCC threshold and 1.235V RESET IN reference. Use Value: Delivers >10-year shelf life with integrated reset/watchdog - avoids discrete RC network drift and leakage errors. |
Use Scenario: Supervises metrology SoC (2.6V core) and isolated RS-485 PHY (3.3V) in ANSI C12.22-compliant meter exposed to wide temperature swings. IC Role / Device Role / Timing Role: Dual-threshold monitoring with capacitor-programmable tRP/tWD allows matching to SoC's POR and firmware watchdog service intervals. Use Value: Eliminates risk of undetected firmware hang during zero-crossing sampling by enforcing strict windowed watchdog behavior (via WDS-selectable mode). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6751KA26+ | Same VCC threshold (2.625V) and dual-monitoring capability, but includes manual-reset input (MR) pin instead of WDI | Preferred where operator-initiated reset is required (e.g., field-serviceable gateways); lacks watchdog input for autonomous fault detection | Select MAX6751KA26+ only if hardware MR switch is mandatory; otherwise MAX6750KA26+ offers superior runtime watchdog coverage |
| TPS3808G33DBVR | Fixed 3.3V VCC threshold, no adjustable RESET IN, lower ICC (1.8µA), but no WDS-selectable extended watchdog mode | Suitable for single-rail 3.3V systems only; cannot monitor secondary voltage or support extended watchdog timeout for slow-boot MCUs | Choose TPS3808G33DBVR for cost-sensitive 3.3V-only designs; MAX6750KA26+ remains optimal for dual-rail, automotive-temp, and extended-timing needs |
Compared with MAX6751KA26+, MAX6750KA26+ trades manual reset for watchdog input - enabling autonomous recovery from software hangs without user intervention. Against TPS3808G33DBVR, it adds dual-voltage monitoring and 128× extended watchdog, at the cost of higher ICC and larger footprint - justifying its use in safety-critical, multi-rail automotive and industrial systems.
Availability
MAX6750KA26+ is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLCs, battery-powered medical monitors, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6750KA26+ 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 precision instrumentation, industrial automation, and automotive markets since 1965.
The MAX6746–MAX6753 product line delivers AEC-Q100-qualified microprocessor supervisors with dual-voltage monitoring, capacitor-programmable timing, and robust transient immunity - engineered specifically for automotive and harsh-environment embedded control.
FAQ
What is the exact factory-trimmed VCC reset threshold voltage for MAX6750KA26+?
The MAX6750KA26+ has a factory-trimmed VCC reset threshold of 2.625V with ±2% tolerance over –40°C to +125°C, corresponding to suffix "26" per Table 2 in the datasheet. This value is laser-trimmed during production and does not require external calibration - ensuring consistent brownout detection across automotive temperature extremes.
Does MAX6750KA26+ support monitoring of two independent supply rails simultaneously?
Yes, MAX6750KA26+ supports true dual-voltage monitoring: it monitors VCC against its internal 2.625V threshold while simultaneously monitoring a second rail (e.g., 3.3V I/O) via the RESET IN pin, which compares against a fixed 1.235V reference. RESET asserts if either rail falls below its respective threshold - eliminating need for a second supervisor IC.
How is the watchdog timeout period configured on MAX6750KA26+?
The MAX6750KA26+ uses capacitor CSWT on the SWT pin to set base watchdog timeout (tWD = 4.94×10⁶ × CSWT seconds). The WDS pin selects between normal mode (WDS = GND) and extended mode (WDS = VCC), multiplying tWD by 128. No pin strapping or firmware is needed - timing is purely analog and board-configurable.
What is the minimum VCC voltage at which MAX6750KA26+ guarantees valid RESET output logic?
MAX6750KA26+ guarantees correct RESET logic state (high/low) for VCC ≥ 1.0V. Below 1.0V, output drive strength degrades, but the device remains functional down to VCC = 1.2V minimum per Absolute Maximum Ratings. For applications requiring valid RESET down to 0V, a 100kΩ pulldown resistor is recommended on the push-pull RESET output.
Is MAX6750KA26+ pin-compatible with other devices in the MAX6746–MAX6753 family?
Yes, all MAX6746–MAX6753 variants share identical 8-pin SOT23 pinout and footprint (K8+5A), including MAX6750KA26+. However, pin functionality differs across subtypes - e.g., MAX6750 uses pin 1 for RESET IN, while MAX6746 uses it for MR. Always verify signal mapping per device-specific pin table before substitution.
MAX6750KA26+ 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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.625V, Adj
- 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
MAX6750KA26+ FAQ
1.How can I place an order for MAX6750KA26+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6750KA26+ 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 MAX6750KA26+ reliable?
The price and inventory of MAX6750KA26+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6750KA26+ is usually 5 days.
3.What payment methods are accepted for MAX6750KA26+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6750KA26+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6750KA26+?
MAX6750KA26+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6750KA26+ 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 MAX6750KA26+?
For technical support, including MAX6750KA26+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6750KA26+ requirements.
6.How does Aetrix verify that MAX6750KA26+ is sourced from the original manufacturer or authorized distributors?
All MAX6750KA26+ 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 MAX6750KA26+ meets industry standards.
7.What is the process for return or replacement of MAX6750KA26+?
All MAX6750KA26+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6750KA26+, 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 MAX6750KA26+ part is unused and in its original packaging.
Return procedure for MAX6750KA26+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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