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Analog Devices Inc./Maxim Integrated MAX6751KA23+T
- Part No.:
- MAX6751KA23+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6751KA23+T.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
- Shipping:
Inventory:2,354
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Product details
Overview
MAX6751KA23+T from Analog Devices is a low-power microprocessor supervisory circuit with dual-voltage monitoring (VCC and adjustable RESET IN), factory-trimmed 2.313V ±2% reset threshold, capacitor-adjustable 7.59ms reset timeout (CSRT = 1500pF), 128× extended watchdog mode, and open-drain active-low RESET output. It operates across -40°C to +125°C and is AEC-Q100 qualified for automotive power-rail supervision.
For engineers reviewing the MAX6751KA23+T datasheet, MAX6751KA23+T pinout, MAX6751KA23+T application, or MAX6751KA23+T equivalent, this device supports critical μP reset and watchdog supervision in battery-powered controllers, intelligent instruments, and automotive ECUs where supply transient immunity and configurable timing are essential.
Technical Context
The MAX6751KA23+T implements dual-supply monitoring: a fixed 2.313V ±2% VCC reset comparator and an adjustable RESET IN input with 1.235V threshold referenced to external resistor dividers. Its watchdog timer uses SWT capacitor timing and WDS logic control to select normal (tWD = 4.94×10⁶ × CSWT) or extended (×128) timeout modes.
Reset assertion is guaranteed for VCC ≥ 1.0V; RESET remains valid down to 1V with ≤0.4V VOL at 3.2mA sink. The device features 3.7μA typical supply current at VCC ≤ 2.0V, ±100ns MR glitch rejection, and 200–300nA SRT/SWT ramp current for precise capacitor-based timing calibration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.2V to 5.5V - supports single-cell LiFePO₄, 3.3V, and 5V systems without level-shifting |
| Reset Threshold Voltage | 2.313V ±2% - factory-trimmed for precise brownout detection on main VCC rail |
| Reset Timeout Period | 7.59ms (typ, CSRT = 1500pF) - sufficient for μP power-up initialization and clock stabilization |
| Watchdog Timeout (Extended) | 971.5ms (typ, CSWT = 1500pF) - enables long software execution cycles before watchdog service required |
| Supply Current | 3.7μA (typ, VCC ≤ 2.0V) - minimizes quiescent drain in always-on battery-backed applications |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive and industrial embedded environments |
| RESET Output Type | Open-drain active-low - allows flexible pull-up to any voltage ≤6V for logic-level translation |
Pinout & Package
MAX6751KA23+T is housed in an 8-pin SOT23 package (Outline 21-0078, RoHS-compliant), measuring 2.9mm × 1.6mm × 1.1mm, suitable for space-constrained PCB layouts in automotive and portable equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | Adjustable reset comparator input | Accepts external resistor-divider to monitor secondary supply (e.g., I/O rail); threshold = 1.235V |
| 2 - GND | Ground reference | Common return for all analog and digital functions; must be low-impedance connection |
| 3 - SWT | Watchdog timeout capacitor node | Connects to ground via CSWT to set base watchdog period (tWD = 4.94×10⁶ × CSWT) |
| 4 - SRT | Reset timeout capacitor node | Connects to ground via CSRT to set reset pulse width (tRP = 4.94×10⁶ × CSRT) |
| 5 - WDS | Watchdog mode select | Pull to GND for normal mode; pull to VCC for 128× extended timeout; state change clears watchdog timer |
| 6 - WDI | Watchdog input | Falling edge resets watchdog timer; must not float - tie to GND via 100kΩ if unused |
| 7 - RESET | Open-drain reset output | Active-low signal asserted during VCC/RESET IN undervoltage or watchdog fault; requires external pull-up |
| 8 - VCC | Power supply input | Primary supply rail monitored at 2.313V; powers internal circuitry and defines logic thresholds |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneously monitors VCC (2.313V fixed) and external rail via RESET IN (1.235V reference), enabling full-system power integrity checks |
| Capacitor-adjustable timing | Independent SRT and SWT pins allow precise, board-level tuning of reset and watchdog periods without firmware changes |
| 128× extended watchdog mode | WDS-controlled scaling eliminates need for large timing capacitors, reducing BOM count and PCB area |
| Transient-immune reset assertion | Guaranteed immunity to ≤50µs transients 100mV below threshold - prevents spurious resets in noisy automotive environments |
| AEC-Q100 qualification | Qualified to Grade 0 (-40°C to +125°C), meeting automotive reliability and stress-test requirements for safety-critical ECUs |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply and 5V analog sensor rail during cold cranking and load dump events. IC Role / Device Role / Timing Role: Dual-voltage supervisor asserting reset when either rail drops below threshold; provides 7.59ms reset hold time for safe μP restart. Use Value: Prevents erratic ECU behavior during battery voltage sag by ensuring deterministic reset sequencing and watchdog coverage over extended engine start cycles. |
Use Scenario: Supervises battery-backed ARM Cortex-M4 in portable infusion pump with dual 1.8V logic and 3.3V motor driver rails. IC Role / Device Role / Timing Role: Uses RESET IN to monitor backup rail while VCC tracks main supply; open-drain RESET interfaces to multiple voltage domains. Use Value: Enables fail-safe shutdown and recovery during battery swap or low-battery conditions, meeting IEC 60601-1 leakage and reset integrity requirements. |
| Industrial Programmable Logic Controller (PLC) I/O Module | Smart Energy Meter MCU Subsystem |
Use Scenario: Ensures reliable startup and runtime supervision of isolated RS-485 communication controller and ADC in DIN-rail mounted PLC. IC Role / Device Role / Timing Role: Provides manual-reset capability via external switch on RESET IN; extended watchdog guards against firmware lockup in field-deployed units. Use Value: Eliminates need for external reset IC and discrete timing components, reducing component count and improving long-term field reliability. |
Use Scenario: Supervises metrology SoC and secure element in ANSI C12.22-compliant smart meter operating from split-phase 120/240V AC-derived supplies. IC Role / Device Role / Timing Role: Monitors both primary 3.3V domain and auxiliary 1.8V crypto rail; 3.7μA ICC enables >10-year battery life in tamper-detection circuits. Use Value: Meets ANSI C12.20 reset timing specifications while minimizing self-consumption in always-on security subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6750KA23+T | Same 2.313V VCC threshold and RESET IN input, but push-pull RESET output instead of open-drain | Requires no external pull-up; unsuitable for level-shifting or wired-OR reset buses | Select when driving a single μP reset pin directly and board space permits slightly higher drive strength |
| TPS3808G33DBVR | Fixed 3.3V reset threshold only; no adjustable RESET IN; 300ms fixed watchdog (no capacitor adjustment) | Lacks dual-rail monitoring and programmable timing; lower quiescent current (1.8μA) | Select for cost-sensitive 3.3V-only applications where timing flexibility and secondary rail supervision are unnecessary |
Compared with MAX6751KA23+T, MAX6750KA23+T offers identical supervision functionality but different output drive architecture, while TPS3808G33DBVR sacrifices adjustability and dual monitoring for ultra-low power and simplified BOM - making MAX6751KA23+T optimal for complex, multi-rail automotive and industrial designs requiring field-tunable timing.
Availability
MAX6751KA23+T is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pump controllers, industrial PLC I/O modules, and smart energy meter MCU subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6751KA23+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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The MAX6746–MAX6753 family was designed specifically for robust, low-power microprocessor supervision in harsh environments - delivering precision reset thresholds, capacitor-adjustable timing, and AEC-Q100 qualification for mission-critical automotive and industrial control systems.
FAQ
What is the exact reset threshold voltage of the MAX6751KA23+T?
The MAX6751KA23+T has a factory-trimmed VCC reset threshold of 2.313V ±2% over -40°C to +125°C. This value is confirmed in Table 2 (suffix "23") of the datasheet and applies specifically to the VCC supply monitoring function. The RESET IN input uses a separate 1.235V ±0.8% threshold for external rail monitoring.
Does the MAX6751KA23+T support manual reset functionality?
No - the MAX6751KA23+T does not include a dedicated MR (manual reset) pin. Unlike MAX6746/MAX6747, it relies solely on VCC and RESET IN undervoltage detection and watchdog faults for reset assertion. Manual reset can be implemented externally by pulling RESET IN low via a switch, as described in Figure 3 of the datasheet.
How do I calculate the capacitor value for a 100ms watchdog timeout in extended mode?
For extended mode (WDS = VCC), use the base formula tWD = 4.94×10⁶ × CSWT, then divide by 128: CSWT = (100ms / 128) / 4.94×10⁶ = 158pF. A standard 150pF ceramic capacitor yields ~95ms timeout; verify with the "Extended-Mode Watchdog Timeout Period vs. CSWT" graph (MAX6746 toc02).
Is the MAX6751KA23+T pin-compatible with other devices in the MAX6746–MAX6753 family?
Yes - all MAX6746–MAX6753 variants share identical 8-pin SOT23 pinouts and footprint (Outline 21-0078). However, pin functionality differs: MAX6751 uses pins 1 (RESET IN), 5 (WDS), and 6 (WDI), whereas MAX6746 uses pin 1 as MR and lacks RESET IN. Always verify signal mapping per device selector guide.
What is the minimum VCC voltage at which RESET remains valid on the MAX6751KA23+T?
RESET is guaranteed functional for VCC ≥ 1.0V, with VOL ≤ 0.4V at 3.2mA sink current. Below 1.0V, output drive degrades; for applications requiring valid RESET down to 0V, a 100kΩ pulldown resistor is recommended - but only with push-pull variants (MAX6751KA23+T is open-drain and incompatible with this method).
MAX6751KA23+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6751KA23+T FAQ
1.How can I place an order for MAX6751KA23+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6751KA23+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 MAX6751KA23+T reliable?
The price and inventory of MAX6751KA23+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6751KA23+T is usually 5 days.
3.What payment methods are accepted for MAX6751KA23+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6751KA23+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6751KA23+T?
MAX6751KA23+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6751KA23+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 MAX6751KA23+T?
For technical support, including MAX6751KA23+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6751KA23+T requirements.
6.How does Aetrix verify that MAX6751KA23+T is sourced from the original manufacturer or authorized distributors?
All MAX6751KA23+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 MAX6751KA23+T meets industry standards.
7.What is the process for return or replacement of MAX6751KA23+T?
All MAX6751KA23+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6751KA23+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 MAX6751KA23+T part is unused and in its original packaging.
Return procedure for MAX6751KA23+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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