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Analog Devices Inc./Maxim Integrated MAX6750KA23-T
- Part No.:
- MAX6750KA23-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6750KA23-T.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
The MAX6750KA23-T from Maxim Integrated is a capacitor-adjustable microprocessor supervisory circuit with dual-voltage monitoring (VCC and external RESET IN), factory-trimmed 2.313V ±2% reset threshold, and push-pull active-low RESET output. It provides reset timeout (5.7–9.5ms with 1500pF) and watchdog timeout (5.7–9.5ms normal mode) for brownout protection and software fault recovery in automotive-grade systems operating from -40°C to +125°C.
For engineers reviewing the MAX6750KA23-T datasheet, MAX6750KA23-T pinout, MAX6750KA23-T application, or MAX6750KA23-T equivalent, key selection criteria include its dual-supply monitoring capability, ±2% VTH accuracy over automotive temperature range, 3.7µA supply current at 2.0V, and compatibility with 1.0V–5.5V VCC operation - critical for battery-powered controllers and embedded safety-critical subsystems.
Technical Context
The MAX6750KA23-T integrates two independent reset comparators: one monitors VCC against a factory-trimmed 2.313V threshold (±2% over -40°C to +125°C), the other monitors an externally adjustable voltage via RESET IN (1.235V threshold). Reset assertion is triggered by either comparator or manual reset input (MR), with guaranteed RESET validity down to VCC = 1.0V.
Its capacitor-adjustable architecture uses SRT pin for reset timeout (tRP = 5.06 × 10⁶ × CSRT) and SWT pin for watchdog timeout (tWD = 5.06 × 10⁶ × CSWT). Unlike MAX6746–MAX6751 variants with WDS-selectable extended mode, the MAX6750KA23-T supports only standard watchdog timing and lacks windowed watchdog or SET0/SET1 configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.313V ±2% - factory-trimmed precision reference enabling reliable brownout detection across full automotive temperature range (-40°C to +125°C) |
| RESET Timeout Range | 0.506ms to 9.487ms - set by 100pF–1500pF capacitor on SRT pin, covering typical µP power-up sequencing requirements |
| Watchdog Timeout Range | 0.506ms to 9.487ms - set by 100pF–1500pF capacitor on SWT pin, supporting flexible firmware watchdog servicing intervals |
| Supply Current | 3.7µA (typ) at VCC ≤ 2.0V - ultra-low quiescent current enabling multi-year battery life in portable medical and sensor nodes |
| Operating Voltage | 1.0V to 5.5V - ensures valid RESET assertion even during deep brownout conditions before µP functional failure |
| Reset Output Type | Push-pull active-low - eliminates need for external pull-up resistor, simplifying PCB layout and reducing BOM count |
| Temperature Range | -40°C to +125°C - AEC-Q100 qualified for under-hood automotive, industrial control, and harsh-environment applications |
Pinout & Package
Package: 8-pin SOT23 (K8-5 outline, 21-0078 land pattern), surface-mount, lead(Pb)-free/RoHS-compliant (denoted by "+T" suffix; "-T" is leaded version).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Manual Reset Input) | Internally pulled-up to VCC; falling edge >1µs asserts RESET - enables hardware-initiated reset without external components |
| 2 | RESET IN | High-impedance input for external voltage divider; monitors secondary supply (e.g., I/O rail) using 1.235V internal reference |
| 3 | SWT (Watchdog Timeout) | Capacitor connection point for setting standard watchdog timeout period (tWD = 5.06 × 10⁶ × CSWT) |
| 4 | SRT (Reset Timeout) | Capacitor connection point for setting reset timeout period (tRP = 5.06 × 10⁶ × CSRT) |
| 5 | GND | Analog/digital ground reference - must be low-impedance connection to minimize noise-induced false resets |
| 6 | WDI (Watchdog Input) | Falling-edge sensitive input; must be toggled within tWD to prevent watchdog timeout reset - interfaces directly to µP GPIO |
| 7 | RESET | Push-pull active-low output - drives µP reset pin directly; sinks 50µA at VCC ≥ 1.0V with VOL ≤ 0.3V |
| 8 | VCC | Main supply input (1.0V–5.5V); powers internal circuitry and serves as monitored voltage source for primary reset comparator |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage monitoring | Simultaneously supervises VCC (2.313V ±2%) and external rail via RESET IN (1.235V reference), enabling comprehensive system-level power integrity checking |
| Capacitor-adjustable timing | Independent SRT and SWT pins allow precise, board-level tuning of reset and watchdog timeouts without firmware changes or component replacement |
| Automotive-grade operation | Guaranteed performance from -40°C to +125°C with ±2% VTH stability - meets requirements for engine control units and ADAS domain controllers |
| Low-power design | 3.7µA supply current at 2.0V enables integration into always-on subsystems such as battery management and telematics wake-up logic |
| Transient immunity | Rejects VCC glitches ≤50µs when undershoot is ≤100mV below VTH - prevents spurious resets during load dump or switching noise events |
Applications
| Automotive Engine Control Unit (ECU) | Portable Medical Infusion Pump |
|---|---|
Use Scenario: Monitors both main 5V microcontroller supply and isolated 3.3V sensor interface rail in engine ECU modules exposed to wide thermal and electrical stress. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting RESET if either VCC drops below 2.313V or RESET IN falls below 1.235V, with 7.6ms timeout ensuring safe µP restart after transient faults. Use Value: Prevents erratic ECU behavior during cold cranking (low-battery transients) and load dump events, meeting ISO 7637-2 pulse 5a immunity requirements. | Use Scenario: Ensures fail-safe operation of battery-powered infusion pump MCU during battery voltage sag or sensor rail dropout. IC Role / Device Role / Timing Role: Supervises 3.3V MCU core supply and 2.5V analog front-end rail; triggers 7.6ms reset pulse on undervoltage, while watchdog enforces firmware liveness check every 5–10ms. Use Value: Guarantees immediate shutdown and restart upon power anomaly, satisfying IEC 60601-1 clause 15.3.2 for life-critical medical device power supervision. |
| Industrial PLC I/O Module | Smart Energy Meter Controller |
Use Scenario: Embedded in DIN-rail mounted PLC I/O module where 24V DC input is regulated to 5V and 3.3V rails powering communication and logic sections. IC Role / Device Role / Timing Role: Monitors 5V logic rail (VCC) and 3.3V isolated comms rail (via RESET IN); MR pin connected to service button for field technician-initiated reset. Use Value: Eliminates need for discrete reset ICs per rail, reducing component count and improving MTBF in high-reliability industrial automation systems. | Use Scenario: Used in revenue-grade smart meter to supervise 3.3V metrology SoC supply and 1.8V RTC backup rail during mains outage and battery switchover. IC Role / Device Role / Timing Role: Detects brownout on primary supply and validates secondary rail integrity; push-pull RESET ensures clean deassertion without pull-up dependency in low-power sleep modes. Use Value: Maintains accurate timekeeping and tamper-resistant logging during grid instability, complying with ANSI C12.20 and IEC 62053-21 accuracy mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6751KA23-T | Includes manual-reset input (MR) pin; MAX6750KA23-T lacks MR functionality | Required where hardware-initiated reset via pushbutton or external logic is mandatory | Select MAX6751KA23-T if MR is needed; otherwise MAX6750KA23-T reduces pin count and simplifies routing |
| TLV803EB23DBZR | Fixed 2.32V reset threshold, no adjustable watchdog or dual-monitoring; 1.8µA ICC at 3.3V | Suitable only for single-rail monitoring with fixed timing; no RESET IN or SWT/SRT capacitor adjustment | Choose TLV803EB23DBZR for cost-sensitive, single-supply applications where timing flexibility is unnecessary |
Compared with MAX6751KA23-T, the MAX6750KA23-T omits MR but retains identical dual-monitoring, capacitor-adjustable timing, and automotive temperature rating - making it optimal for space-constrained designs where manual reset is handled elsewhere. Versus TLV803EB23DBZR, it offers significantly greater system-level supervision capability at modest cost premium.
Availability
MAX6750KA23-T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical devices, industrial PLC modules, and smart energy meter controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6750KA23-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 demanding industrial, automotive, and medical applications.
The MAX6746–MAX6753 family delivers capacitor-programmable µP supervisors with dual-voltage monitoring and watchdog functionality, targeting safety-critical embedded systems needing configurable, automotive-qualified power supervision.
FAQ
What is the factory-trimmed reset threshold voltage for MAX6750KA23-T?
The MAX6750KA23-T has a factory-trimmed VCC reset threshold of 2.313V with ±2% tolerance over the full automotive temperature range (-40°C to +125°C), as defined by the "23" suffix in its part number per Table 2 of the datasheet. This value is laser-trimmed during production and does not require external calibration. The MAX6750KA23-T also monitors RESET IN with a fixed 1.235V threshold for dual-rail supervision.
Does MAX6750KA23-T support windowed watchdog functionality?
No, the MAX6750KA23-T does not support windowed watchdog functionality. It implements only the standard watchdog timer found in MAX6746–MAX6751 devices, with timeout adjustable via SWT capacitor. Windowed watchdog (min/max timing detection) is exclusive to MAX6752/MAX6753 variants, which use SET0/SET1 pins to configure fast/slow fault windows - a feature absent in the MAX6750KA23-T pinout and functional block diagram.
Can MAX6750KA23-T monitor two independent supply voltages simultaneously?
Yes, the MAX6750KA23-T performs true dual-voltage monitoring: it compares VCC against its factory-trimmed 2.313V threshold while simultaneously comparing the voltage at the RESET IN pin against a fixed 1.235V internal reference. RESET asserts if either condition is violated. This allows independent supervision of, for example, a 5V logic rail (VCC) and a 3.3V I/O rail (via resistor divider on RESET IN), as confirmed in the "Dual-Voltage Monitoring (MAX6750/MAX6751)" section of the datasheet.
What is the minimum VCC required for guaranteed RESET output validity in MAX6750KA23-T?
The MAX6750KA23-T guarantees valid RESET output logic state for VCC ≥ 1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below 1.0V, RESET may become indeterminate due to declining sink current capability. For applications requiring valid RESET down to 0V, a 100kΩ pulldown resistor must be added externally to the RESET pin - a technique validated in Figure 7 of the datasheet and applicable because MAX6750KA23-T uses push-pull output.
How is the reset timeout period calculated for MAX6750KA23-T?
The reset timeout period (tRP) for MAX6750KA23-T is calculated using the formula tRP = 5.06 × 10⁶ × CSRT, where tRP is in seconds and CSRT is the capacitance (in Farads) connected between the SRT pin and GND. For example, a 1500pF capacitor yields tRP ≈ 7.59ms (typical), matching the 5.692–9.487ms range specified in the Electrical Characteristics table. This capacitor must be low-leakage (<10nA), with ceramic recommended per Applications Information section.
MAX6750KA23-T 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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.313V, Adj
- Output:
- Push-Pull, Totem Pole
- 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
MAX6750KA23-T FAQ
1.How can I place an order for MAX6750KA23-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6750KA23-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 MAX6750KA23-T reliable?
The price and inventory of MAX6750KA23-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6750KA23-T is usually 5 days.
3.What payment methods are accepted for MAX6750KA23-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6750KA23-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6750KA23-T?
MAX6750KA23-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6750KA23-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 MAX6750KA23-T?
For technical support, including MAX6750KA23-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6750KA23-T requirements.
6.How does Aetrix verify that MAX6750KA23-T is sourced from the original manufacturer or authorized distributors?
All MAX6750KA23-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 MAX6750KA23-T meets industry standards.
7.What is the process for return or replacement of MAX6750KA23-T?
All MAX6750KA23-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6750KA23-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 MAX6750KA23-T part is unused and in its original packaging.
Return procedure for MAX6750KA23-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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