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Analog Devices Inc./Maxim Integrated MAX6750KA43+T
- Part No.:
- MAX6750KA43+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6750KA43+T.pdf
- Description:
- MAX6750 UP RESET CKT W/CAPACITOR
- Quantity:
- Payment:
- Shipping:
Inventory:5,925
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Product details
Overview
MAX6750KA43+T from Maxim Integrated is a capacitor-adjustable microprocessor supervisory circuit with dual-voltage monitoring (VCC and external RESET IN), factory-trimmed 4.3V ±2% reset threshold, and window watchdog timer. It asserts an active-low push-pull RESET output for ≥7.59ms after VCC or RESET IN drops below threshold or manual reset is triggered, and operates across -40°C to +125°C for automotive power-rail monitoring.
For engineers reviewing the MAX6750KA43+T datasheet, MAX6750KA43+T pinout, MAX6750KA43+T application, or MAX6750KA43+T equivalent, key selection criteria include its 4.3V fixed VCC threshold, dual-supply monitoring capability, windowed watchdog timing (tWD1/tWD2), SOT23-8 package compatibility, and AEC-Q100 qualification for under-hood electronics.
Technical Context
The MAX6750KA43+T integrates two independent reset comparators: one monitors VCC against a factory-trimmed 4.3V ±2% threshold (VTH), while the other monitors an external voltage via RESET IN with a fixed 1.235V ±0.8% threshold (VRESET IN). It supports dual-voltage fault detection - RESET asserts if either VCC < 4.3V or RESET IN < 1.235V.
This device implements a window watchdog timer using SET0/SET1 pin strapping and SWT capacitor programming: tWD2 (slow timeout) scales with CSWT (0.65 × 10⁹ × CSWT), while tWD1 (fast timeout) is selectable at ratios of 8×, 16×, or 64× tWD2. The RESET output remains asserted for a capacitor-adjustable period (tRP = 4.94 × 10⁶ × CSRT) after fault clearance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VCC) | 4.300V ±2% (factory-trimmed; enables precise brownout detection at nominal 5V rail) |
| RESET IN Threshold | 1.235V ±0.8% (fixed internal reference; supports external resistor-divider for secondary supply monitoring) |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V (ultra-low quiescent current extends battery life in portable systems) |
| Reset Timeout Period | 7.59ms typical (with CSRT = 1500pF; ensures reliable µP initialization during slow-ramp power-up) |
| Slow Watchdog Period (tWD2) | 971.5ms typical (with CSWT = 1500pF; defines upper bound of valid processor activity window) |
| Fast Watchdog Period (tWD1) | 121.43ms typical (SET0=LOW/SET1=LOW; defines lower bound of valid watchdog pulse interval) |
| Operating Temperature | -40°C to +125°C (fully specified for automotive under-hood environments per AEC-Q100 Grade 0) |
Pinout & Package
MAX6750KA43+T is housed in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176), RoHS-compliant, with 0.65mm pitch and 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) for external voltage monitoring via resistor divider; triggers reset when voltage falls below 1.235V |
| 2 - GND | Ground reference | Primary return path for all internal circuits and capacitor-connected pins (SRT, SWT); must be low-impedance |
| 3 - VCC | Power supply input | Monitored 1.2V–5.5V supply rail; powers device and provides reference for VCC reset comparator (4.3V threshold) |
| 4 - RESET | Active-low reset output | Push-pull driver (VOH = 0.8×VCC, VOL = 0.3V @ ISINK = 1.2mA); asserts low for tRP after any fault condition |
| 5 - SWT | Slow watchdog timeout capacitor terminal | Connects to ground via CSWT (100pF–1500pF); sets tWD2 = 0.65 × 10⁹ × CSWT (e.g., 971.5ms @ 1500pF) |
| 6 - SRT | Reset timeout capacitor terminal | Connects to ground via CSRT (100pF–1500pF); sets tRP = 4.94 × 10⁶ × CSRT (e.g., 7.59ms @ 1500pF) |
| 7 - SET0 | Watchdog window ratio select (LSB) | Logic input (VIH = 0.7×VCC); selects tWD1 ratio: LOW/LOW = 8×, LOW/HIGH = 16×, HIGH/HIGH = 64× tWD2 |
| 8 - SET1 | Watchdog window ratio select (MSB) | Logic input (VIH = 0.7×VCC); used with SET0 to configure fast watchdog window; HIGH/LOW disables watchdog |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset comparators | Simultaneously monitors VCC (4.3V ±2%) and external supply (1.235V ±0.8%), enabling robust multi-rail supervision without external components |
| Window watchdog timer | Detects both fast faults (WDI pulses < tWD1) and slow faults (WDI intervals > tWD2); eliminates false resets from transient software stalls or timing jitter |
| Capacitor-adjustable timing | CSRT and CSWT set reset and watchdog timeouts independently using low-leakage ceramic capacitors - no trimming resistors or firmware overhead required |
| AEC-Q100 Grade 0 qualification | Validated for automotive applications requiring operation from -40°C to +125°C ambient, including engine control units and ADAS domain controllers |
| Ultra-low supply current | 3.7µA max at VCC ≤ 2.0V enables use in always-on battery-backed subsystems (e.g., telematics wake-up logic, CAN bus supervisors) |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 5V main supply and 3.3V microcontroller I/O rail during cold cranking and load dump events. IC Role / Device Role / Timing Role: Dual-voltage supervisor asserting RESET if either rail falls below specification; window watchdog validates MCU instruction flow. Use Value: Prevents ECU lockup during voltage transients; tWD1/tWD2 window rejects spurious WDI glitches while catching stuck firmware loops. |
Use Scenario: Supervises battery-backed real-time clock (RTC) supply and main 3.3V controller rail in safety-critical drug delivery hardware. IC Role / Device Role / Timing Role: Provides fail-safe reset initiation and deterministic watchdog timeout with guaranteed VCC ≥ 1V operation. Use Value: Ensures deterministic restart within 7.59ms after brownout; window watchdog detects missed safety-check intervals without false triggers from sensor noise. |
| Industrial PLC I/O Module | Portable Test Equipment |
Use Scenario: Guards 24V-to-5V DC-DC output and isolated 3.3V FPGA configuration rail in harsh factory-floor environments. IC Role / Device Role / Timing Role: Dual-threshold supervision with high noise immunity; RESET output drives FPGA PROG_B and microcontroller nRST simultaneously. Use Value: ±2% VCC threshold tolerance accommodates wide input ripple; 100ns MR glitch rejection prevents false resets from relay contact bounce. |
Use Scenario: Manages power sequencing and runtime integrity for handheld multimeter with ARM Cortex-M0+ and Li-ion battery management. IC Role / Device Role / Timing Role: Low-current supervisor (3.7µA) extending battery life; capacitor-adjustable tRP aligns with MCU boot ROM timing requirements. Use Value: Enables 10-year shelf life in storage mode; window watchdog enforces periodic self-test execution without increasing firmware complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6751KA43+T | Same 4.3V VCC threshold and dual-monitoring architecture, but includes manual-reset input (MR) pin instead of SET1 | Preferred where operator-initiated reset is required (e.g., field-serviceable instruments); lacks window watchdog ratio flexibility | Select MAX6751KA43+T only if MR functionality is needed and SET1-based watchdog tuning is unnecessary |
| TLV803EB43DBZR | Single-supply 4.3V supervisor (no RESET IN input), fixed 200ms reset timeout, no watchdog, SOT23-3 package | Suitable for cost-sensitive, single-rail applications without watchdog or secondary voltage monitoring | Choose TLV803EB43DBZR only for basic reset-only functions where dual monitoring and programmable timing are not required |
Compared with MAX6751KA43+T, the MAX6750KA43+T trades manual reset for enhanced watchdog configurability via SET0/SET1; compared with TLV803EB43DBZR, it adds dual-voltage supervision, capacitor-adjustable timing, and window watchdog - critical for functional safety compliance in automotive and medical systems.
Availability
MAX6750KA43+T is available at Aetrix Electronics and suitable for automotive ECUs, medical infusion pumps, industrial PLC modules, and portable test equipment requiring stable component supply with AEC-Q100 assurance and long-term lifecycle support.
Supply support for MAX6750KA43+T 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 automotive, industrial, and computing applications, with emphasis on reliability and integration.
The MAX6746–MAX6753 family delivers capacitor-programmable µP supervisors with dual-voltage monitoring and window watchdogs, targeting functional safety-critical systems where deterministic reset behavior and fault coverage are mandatory.
FAQ
What is the exact reset threshold voltage for MAX6750KA43+T?
The MAX6750KA43+T features a factory-trimmed VCC reset threshold of 4.300V ±2% (4.214V to 4.386V) over -40°C to +125°C, as defined by suffix "43" in the ordering code and confirmed in Table 2 of the datasheet. This applies specifically to the VCC monitor; the RESET IN threshold remains fixed at 1.235V ±0.8%.
Does MAX6750KA43+T support manual reset functionality?
No, the MAX6750KA43+T does not include a manual-reset (MR) input. Its pinout replaces MR with SET1 to enable window watchdog ratio selection. For manual reset capability with the same 4.3V threshold, the functionally similar MAX6751KA43+T is the designated alternative, as shown in the Pin Configurations table.
How is the window watchdog timeout configured on MAX6750KA43+T?
The MAX6750KA43+T uses SET0 and SET1 pins to select the tWD1/tWD2 window ratio (8×, 16×, or 64×), while SWT capacitor (CSWT) sets the base slow timeout tWD2. With CSWT = 1500pF, tWD2 = 971.5ms (typ); selecting SET0=LOW/SET1=LOW yields tWD1 = 121.43ms (typ), defining the valid watchdog pulse window.
What package type and footprint does MAX6750KA43+T use?
MAX6750KA43+T uses an 8-pin SOT23 package (outline number 21-0078, land pattern 90-0176), with 0.65mm lead pitch and RoHS-compliant finish. The package drawing and soldering profiles (reflow at +260°C, 10s lead temp at +300°C) are documented in the Maxim Integrated package database.
Is MAX6750KA43+T qualified for automotive applications?
Yes, MAX6750KA43+T is AEC-Q100 qualified (Grade 0) and fully specified over -40°C to +125°C ambient temperature. Its electrical characteristics, including reset threshold accuracy, supply current, and timing parameters, are guaranteed across this range - making it suitable for engine control, body electronics, and ADAS subsystems.
MAX6750KA43+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.3V, Adj
- 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
MAX6750KA43+T FAQ
1.How can I place an order for MAX6750KA43+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6750KA43+T 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 MAX6750KA43+T reliable?
The price and inventory of MAX6750KA43+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6750KA43+T is usually 5 days.
3.What payment methods are accepted for MAX6750KA43+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6750KA43+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6750KA43+T?
MAX6750KA43+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6750KA43+T 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 MAX6750KA43+T?
For technical support, including MAX6750KA43+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6750KA43+T requirements.
6.How does Aetrix verify that MAX6750KA43+T is sourced from the original manufacturer or authorized distributors?
All MAX6750KA43+T 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 MAX6750KA43+T meets industry standards.
7.What is the process for return or replacement of MAX6750KA43+T?
All MAX6750KA43+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6750KA43+T, 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 MAX6750KA43+T part is unused and in its original packaging.
Return procedure for MAX6750KA43+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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