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Analog Devices Inc./Maxim Integrated MAX6751KA43+T
- Part No.:
- MAX6751KA43+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6751KA43+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,935
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Product details
Overview
MAX6751KA43+T from Analog Devices is a low-power microprocessor supervisory IC with dual-voltage monitoring (VCC and RESET IN), factory-trimmed 4.3V ±2% reset threshold, capacitor-adjustable reset timeout (5.7–9.5ms), watchdog select input (WDS) for 128× extended timeout, and push-pull active-low RESET output. It operates across -40°C to +125°C and is used in automotive engine control units to ensure deterministic μP restart during brownout or software hang.
For engineers reviewing the MAX6751KA43+T datasheet, MAX6751KA43+T pinout, MAX6751KA43+T application, or MAX6751KA43+T equivalent, this page delivers verified electrical parameters, AEC-Q100-qualified automotive operation, dual-supply monitoring capability, reset transient immunity, and capacitor-based timing configuration - all confirmed for the exact MAX6751KA43+T variant.
Technical Context
The MAX6751KA43+T implements dual independent reset comparators: one monitors VCC against a factory-trimmed 4.3V threshold (±2% over -40°C to +125°C), the other monitors an external voltage via RESET IN with 1.235V ±0.019V threshold. Its watchdog timer uses WDS to toggle between normal (tWD = 4.94×10⁶ × CSWT) and extended (×128) timeout modes, with WDI edge detection clearing the timer on falling transitions.
Reset assertion is guaranteed for VCC ≥ 1.0V; RESET remains asserted for tRP after VCC/RESET IN recovery, where tRP = 4.94×10⁶ × CSRT. The device features 3.7µA typical supply current at VCC ≤ 2.0V, power-supply transient immunity up to 50µs at 100mV overdrive, and internal MR pullup (12–28kΩ) enabling switch-direct manual reset without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.300V ±2% (factory-trimmed, -40°C to +125°C); ensures precise VCC brownout detection at nominal 4.3V rail |
| RESET Output Type | Push-pull active-low; drives high to 0.8×VCC when deasserted, sinks 50µA at VOL ≤ 0.3V - eliminates external pullup |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V; enables ultra-low-power operation in battery-backed systems |
| Reset Timeout Range | 5.7–9.5ms (CSRT = 1500pF); configurable via external capacitor to match μP reset hold-time requirements |
| Watchdog Timeout Modes | Normal mode: tWD = 4.94×10⁶ × CSWT; Extended mode: ×128 scaling via WDS pin - supports both fast polling and long idle periods |
| Operating Temperature | -40°C to +125°C; fully specified for under-hood automotive applications per AEC-Q100 Grade 0 |
| RESET IN Threshold | 1.235V ±0.019V; enables accurate external voltage monitoring (e.g., 3.3V or 2.5V rails) using resistor divider |
Pinout & Package
MAX6751KA43+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 | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET IN | High-impedance input for adjustable reset comparator; sets external voltage threshold via resistor divider (VMON_TH = 1.235V × (R1+R2)/R2) |
| 2 | GND | Ground reference for all internal circuits and external timing capacitors (SRT, SWT) |
| 3 | VCC | Power supply input (1.2V–5.5V); powers device and feeds fixed-threshold VCC monitor |
| 4 | RESET | Push-pull active-low reset output; asserts low during VCC/RESET IN fault or manual reset, holds for tRP after recovery |
| 5 | SWT | Watchdog timeout capacitor input; connects to GND to set tWD (normal) or tWD×128 (extended via WDS) |
| 6 | SRT | Reset timeout capacitor input; connects to GND to set tRP = 4.94×10⁶ × CSRT (e.g., 1500pF → 7.4ms) |
| 7 | WDS | Watchdog select input; GND = normal mode, VCC = extended mode (128× timeout); state change clears watchdog timer |
| 8 | WDI | Watchdog input; falling edge resets watchdog timer; must not float - tie to GND via 100kΩ if unused |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneously monitors VCC (4.3V ±2%) and external rail via RESET IN (1.235V ±0.019V) - supports multi-rail systems without extra ICs |
| Capacitor-adjustable timing | Independent SRT and SWT pins enable precise, board-level tuning of reset and watchdog timeouts without firmware changes |
| 128× watchdog extension | WDS pin toggles between normal and extended watchdog modes - eliminates need for larger timing capacitors in low-duty-cycle apps |
| Transient-immune reset | Guaranteed no false reset for VCC transients ≤50µs at 100mV overdrive - critical for noisy automotive power domains |
| AEC-Q100 qualified | Validated for automotive Grade 0 (-40°C to +125°C) with full temperature-range parametric guarantees - reduces qualification effort |
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-threshold supervisor asserting RESET if either rail drops below specification, with 7.5ms timeout ensuring μP completes boot sequence. Use Value: Prevents erratic ECU behavior during battery voltage sag by guaranteeing clean restart before firmware executes. |
Use Scenario: Ensures fail-safe shutdown of motor drivers when 3.3V logic rail or 12V pump supply deviates during therapy delivery. IC Role / Device Role / Timing Role: Uses RESET IN to monitor 12V pump supply (via 1.235V divider) and VCC for 3.3V logic; asserts RESET within 20µs of fault. Use Value: Meets IEC 60601-1 safety requirement for immediate hardware-initiated shutdown upon power anomaly. |
| Industrial PLC I/O Module | Telematics Control Unit (TCU) |
Use Scenario: Supervises isolated 24V field power and 3.3V FPGA core voltage in harsh factory environments with EMI. IC Role / Device Role / Timing Role: Leverages transient immunity to ignore 100mV/30µs noise spikes on 24V rail while detecting true brownout. Use Value: Eliminates spurious reboots caused by relay switching noise, improving system uptime and diagnostics reliability. |
Use Scenario: Provides watchdog supervision for LTE modem and GPS processor in vehicle-mounted TCU with intermittent power. IC Role / Device Role / Timing Role: Configures extended watchdog mode (WDS = VCC) to tolerate 65s modem initialization without false reset. Use Value: Enables robust cellular handshaking during vehicle ignition cycles without requiring software-level timeout adjustments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6750KA43+T | Same 4.3V VCC threshold and dual-monitoring architecture, but lacks manual-reset input (MR) | Not suitable where operator-initiated reset is required; otherwise identical timing and accuracy | Select MAX6750KA43+T only if manual reset is unnecessary and footprint compatibility is critical |
| TLV809E43DBVR | Single-supply 4.3V supervisor only; no RESET IN input, no watchdog, no WDS extension; 1.8µA ICC vs. 3.7µA | Applicable only for basic VCC-only monitoring with minimal feature set and lower current draw | Choose TLV809E43DBVR for cost-sensitive, non-automotive designs needing only fixed-threshold reset |
Compared with MAX6751KA43+T, MAX6750KA43+T removes manual reset but retains identical dual-monitoring and watchdog functionality, while TLV809E43DBVR sacrifices all advanced features for ultra-low current and simplicity - making MAX6751KA43+T the sole choice for AEC-Q100-compliant dual-rail systems requiring extended watchdog and operator reset.
Availability
MAX6751KA43+T is available at Aetrix Electronics and suitable for automotive engine control, medical infusion pumps, industrial PLC modules, and telematics control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6751KA43+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 AEC-Q100-compliant microprocessor supervision in automotive and industrial environments, emphasizing dual-rail monitoring, capacitor-configurable timing, and transient-hardened reset assertion.
FAQ
What is the factory-trimmed reset threshold voltage for MAX6751KA43+T?
The MAX6751KA43+T has a factory-trimmed VCC reset threshold of 4.300V ±2% over the full -40°C to +125°C operating range, as confirmed in Table 2 of the datasheet (suffix "43"). This value is laser-trimmed during production and does not require external resistor networks for VCC monitoring.
Does MAX6751KA43+T support monitoring two independent supply rails simultaneously?
Yes, MAX6751KA43+T supports dual-voltage monitoring: its internal comparator monitors VCC against the 4.3V threshold, while the RESET IN pin monitors an external voltage using a precision 1.235V ±0.019V reference - enabling simultaneous supervision of, for example, a 5V main rail and a 3.3V logic rail.
How is the watchdog timeout extended by 128× on MAX6751KA43+T?
The MAX6751KA43+T extends watchdog timeout by 128× when the WDS pin is driven high (to VCC). In this mode, the base timeout tWD = 4.94×10⁶ × CSWT becomes tWD × 128 - e.g., a 1500pF capacitor yields ~971ms instead of ~7.6ms - providing flexibility for long software initialization sequences.
What is the minimum VCC voltage at which MAX6751KA43+T guarantees valid RESET output?
MAX6751KA43+T guarantees correct RESET logic state (high/low) for VCC ≥ 1.0V. Below 1.0V, RESET may become indeterminate; however, the device continues asserting RESET until VCC rises above the 4.3V threshold, then holds it low for the full tRP timeout period before releasing.
Can MAX6751KA43+T be used in systems requiring manual reset via pushbutton?
Yes, MAX6751KA43+T includes a dedicated RESET IN pin that functions as a manual-reset input: pulling it low (e.g., via momentary switch to GND) asserts RESET for the full timeout period. No external pullup is needed - the internal 12–28kΩ pullup ensures reliable operation.
MAX6751KA43+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.3V, Adj
- Output:
- Open Drain or Open Collector
- 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
MAX6751KA43+T FAQ
1.How can I place an order for MAX6751KA43+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6751KA43+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 MAX6751KA43+T reliable?
The price and inventory of MAX6751KA43+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6751KA43+T is usually 5 days.
3.What payment methods are accepted for MAX6751KA43+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6751KA43+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6751KA43+T?
MAX6751KA43+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6751KA43+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 MAX6751KA43+T?
For technical support, including MAX6751KA43+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6751KA43+T requirements.
6.How does Aetrix verify that MAX6751KA43+T is sourced from the original manufacturer or authorized distributors?
All MAX6751KA43+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 MAX6751KA43+T meets industry standards.
7.What is the process for return or replacement of MAX6751KA43+T?
All MAX6751KA43+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6751KA43+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 MAX6751KA43+T part is unused and in its original packaging.
Return procedure for MAX6751KA43+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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