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Analog Devices Inc./Maxim Integrated MAX6751KA30/V+T
- Part No.:
- MAX6751KA30/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6751KA30/V+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,772
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Product details
Overview
MAX6751KA30/V+T from Analog Devices is a low-power microprocessor supervisory circuit with factory-trimmed 3.0V VCC reset threshold (±2%), capacitor-adjustable reset timeout (5.7–9.5ms), and extended-mode watchdog timeout (729–1214ms). It monitors dual supply voltages (VCC and external RESET IN), features push-pull active-low RESET output, and operates across the automotive temperature range (−40°C to +125°C) for use in battery-powered controllers and critical μP monitoring.
For engineers reviewing the MAX6751KA30/V+T datasheet, MAX6751KA30/V+T pinout, MAX6751KA30/V+T application, or MAX6751KA30/V+T equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior under voltage transients, dual-voltage monitoring capability, and AEC-Q100-qualified automotive-grade reliability data - all confirmed from official Analog Devices documentation.
Technical Context
The MAX6751KA30/V+T integrates two independent reset comparators: one for factory-trimmed 3.0V VCC monitoring (±2% over −40°C to +125°C) and another for adjustable RESET IN threshold (1.235V ±0.8%). Its dual-voltage supervision asserts RESET if either VCC drops below 3.0V or RESET IN falls below 1.235V × (R1+R2)/R2.
It implements an extended-mode watchdog timer with 128× timeout scaling: normal mode uses CSWT to set tWD = 4.94×10⁶ × CSWT, while WDS = VCC extends it to tWD × 128. Reset timeout tRP is independently set via CSRT using identical scaling (tRP = 4.94×10⁶ × CSRT).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 3.0V ±2% (factory-trimmed VCC monitor); ensures reliable brownout detection at nominal 3.0V rail |
| RESET IN Threshold | 1.235V ±0.8% (adjustable via external resistor divider); enables precise monitoring of secondary supply |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V; enables multi-year operation in battery-powered systems |
| Reset Timeout Period | 5.69–9.49ms (CSRT = 1500pF); sufficient for most μP power-up stabilization sequences |
| Extended Watchdog Timeout | 729–1214ms (CSWT = 1500pF, WDS = VCC); supports long software execution cycles without false resets |
| Operating Temperature | −40°C to +125°C; fully specified for under-hood automotive and industrial embedded environments |
| RESET Output Type | Push-pull active-low; eliminates need for external pull-up and ensures valid logic down to VCC ≥ 1V |
Pinout & Package
MAX6751KA30/V+T is housed in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176), RoHS-compliant, with 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 for external resistor-divider; sets secondary voltage threshold (e.g., 1.8V, 2.5V) |
| 2 - GND | Ground reference | Common return for all internal circuits; must be low-impedance connection to system ground plane |
| 3 - SWT | Watchdog timeout capacitor input | Connects to ground via CSWT; sets base watchdog period (tWD) or slow window (tWD2) |
| 4 - SRT | Reset timeout capacitor input | Connects to ground via CSRT; sets reset assertion duration (tRP) independent of watchdog |
| 5 - VCC | Power supply input | Monitored 3.0V supply rail; powers internal circuitry and enables VCC-based reset detection |
| 6 - RESET | Active-low reset output | Push-pull driver; directly drives μP reset pin without external components; valid down to VCC ≥ 1V |
| 7 - WDS | Watchdog select input | Logic-controlled mode selector: GND = normal watchdog, VCC = 128× extended timeout |
| 8 - WDI | Watchdog input | Falling-edge-triggered; must toggle within selected watchdog window to prevent reset assertion |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneously monitors fixed 3.0V VCC and user-adjustable RESET IN rail - essential for systems with multiple supply domains |
| 128× extended watchdog mode | WDS pin enables scalable timeout (e.g., 729ms with 1500pF), eliminating need for large capacitors in long-cycle firmware |
| Transient-immune reset logic | Guaranteed immunity to 100mV VCC transients lasting ≤50µs - prevents spurious resets in noisy automotive environments |
| AEC-Q100 qualified | Qualified to Grade 0 (−40°C to +125°C), meeting automotive reliability and stress-test requirements |
| Valid RESET at low VCC | RESET remains functional down to VCC = 1.0V - ensures deterministic reset behavior during deep brownout conditions |
Applications
| Battery-Powered Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: Long-life remote sensor nodes powered by coin cells or Li-SOCl₂ batteries requiring ultra-low quiescent current and robust brownout protection. IC Role / Device Role / Timing Role: Supervises main 3.0V system rail and auxiliary 1.8V sensor supply; asserts RESET if either drops below threshold during cold cranking or battery aging. Use Value: 3.7µA supply current extends battery life >10 years; dual-threshold detection prevents premature shutdown during transient dips. |
Use Scenario: Under-dash control units exposed to wide ambient temperatures and electrical noise from motors, alternators, and RF sources. IC Role / Device Role / Timing Role: Monitors 3.0V MCU core supply and 5.0V I/O rail via RESET IN divider; provides extended watchdog (729ms) to accommodate CAN bus arbitration delays. Use Value: AEC-Q100 qualification and 100mV/50µs transient immunity ensure no false resets during load dump or ignition switching. |
| Medical Infusion Pumps | Industrial PLC I/O Modules |
Use Scenario: Safety-critical drug delivery systems where firmware lockup must trigger immediate hardware reset to halt motor actuation. IC Role / Device Role / Timing Role: Provides dual-voltage monitoring (3.0V MCU + 2.5V analog front-end) and fast-response watchdog (300ns WDI pulse detection) to catch processor hangs before dose error occurs. Use Value: Push-pull RESET guarantees clean, fast reset edge without pull-up dependencies - critical for fail-safe state recovery. |
Use Scenario: DIN-rail mounted programmable logic controllers operating in factory environments with EMI from VFDs and welding equipment. IC Role / Device Role / Timing Role: Supervises 3.0V controller supply and 24V field-side isolated supply (via RESET IN divider); uses extended watchdog to tolerate deterministic scan-time jitter. Use Value: −40°C to +125°C operation and guaranteed RESET validity down to VCC = 1.0V maintain control integrity during thermal cycling and brownouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6750KA30/V+T | Same 3.0V VCC threshold and dual-supply capability, but includes manual-reset input (MR) instead of WDS | Preferred when operator-initiated reset is required; lacks 128× watchdog extension | Select MAX6750KA30/V+T only if MR functionality is needed and extended watchdog is unnecessary |
| TPS3808G30DBVR | 3.0V fixed threshold, 350ms max watchdog (non-extendable), 2.5µA ICC, SOT23-6 package (no RESET IN pin) | Single-supply only; no adjustable secondary monitoring; smaller footprint but less flexible supervision | Choose TPS3808G30DBVR for cost-sensitive, single-rail designs where RESET IN functionality is not required |
Compared with MAX6750KA30/V+T, the MAX6751KA30/V+T trades manual reset for 128× watchdog scalability - enabling longer firmware cycles without capacitor size penalty. Against TPS3808G30DBVR, it adds dual-voltage monitoring and extended timeout at the cost of two extra pins and slightly higher quiescent current.
Availability
MAX6751KA30/V+T is available at Aetrix Electronics and suitable for battery-powered controllers, automotive body control modules, medical infusion pumps, and industrial PLC I/O modules requiring stable component supply across extended temperature and lifecycle demands.
Supply support for MAX6751KA30/V+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 precision instrumentation, industrial automation, and automotive markets since 1965.
The MAX6746–MAX6753 family was designed specifically for AEC-Q100-compliant microprocessor supervision in harsh environments - delivering dual-voltage monitoring, scalable watchdog timing, and ultra-low power consumption for safety-critical embedded systems.
FAQ
What is the factory-trimmed reset threshold voltage for MAX6751KA30/V+T?
The MAX6751KA30/V+T has a factory-trimmed VCC reset threshold of 3.0V with ±2% tolerance over −40°C to +125°C, as confirmed in the Electrical Characteristics table and Selector Guide. This value is fixed and non-adjustable, unlike the RESET IN input which supports external resistor-divider configuration for secondary supply monitoring.
Does MAX6751KA30/V+T support dual-voltage monitoring, and how is it implemented?
Yes, MAX6751KA30/V+T supports dual-voltage monitoring: Pin 1 (RESET IN) accepts an externally divided voltage to set a second reset threshold (e.g., 1.8V or 2.5V), while Pin 5 (VCC) is monitored against the fixed 3.0V threshold. RESET asserts if either voltage falls below its respective threshold - a capability explicitly documented in the Dual-Voltage Monitoring section and Selector Guide.
How does the extended watchdog mode work on MAX6751KA30/V+T?
The MAX6751KA30/V+T implements extended watchdog mode via Pin 7 (WDS): when pulled to VCC, it multiplies the base watchdog timeout (set by CSWT on Pin 3) by 128×. For example, with CSWT = 1500pF, normal mode yields ~7.6ms, while extended mode yields ~971ms. This is distinct from MAX6752/MAX6753 windowed watchdogs and is confirmed in the Pin Descriptions and Detailed Description sections.
What is the minimum VCC level at which MAX6751KA30/V+T guarantees valid RESET output?
MAX6751KA30/V+T guarantees valid RESET output down to VCC = 1.0V, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. Below 1.0V, RESET logic state is not guaranteed - a design constraint explicitly called out in the "Ensuring a Valid RESET Down to VCC = 0V" application note for push-pull variants like this one.
Is MAX6751KA30/V+T AEC-Q100 qualified, and what grade does it meet?
Yes, MAX6751KA30/V+T is AEC-Q100 qualified per the Benefits and Features section and Ordering Information. It meets Grade 0 specifications (−40°C to +125°C operating temperature), with full characterization across that range confirmed in the Electrical Characteristics tables and Typical Operating Characteristics plots.
MAX6751KA30/V+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 3V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6751KA30/V+T FAQ
1.How can I place an order for MAX6751KA30/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6751KA30/V+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 MAX6751KA30/V+T reliable?
The price and inventory of MAX6751KA30/V+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6751KA30/V+T is usually 5 days.
3.What payment methods are accepted for MAX6751KA30/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6751KA30/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6751KA30/V+T?
MAX6751KA30/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6751KA30/V+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 MAX6751KA30/V+T?
For technical support, including MAX6751KA30/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6751KA30/V+T requirements.
6.How does Aetrix verify that MAX6751KA30/V+T is sourced from the original manufacturer or authorized distributors?
All MAX6751KA30/V+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 MAX6751KA30/V+T meets industry standards.
7.What is the process for return or replacement of MAX6751KA30/V+T?
All MAX6751KA30/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6751KA30/V+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 MAX6751KA30/V+T part is unused and in its original packaging.
Return procedure for MAX6751KA30/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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