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Analog Devices Inc./Maxim Integrated MAX6751KA29+T
- Part No.:
- MAX6751KA29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6751KA29+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,096
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Product details
Overview
MAX6751KA29+T from Analog Devices is a low-power microprocessor supervisory circuit with factory-trimmed 2.925V ±2% VCC reset threshold, adjustable watchdog timeout (normal/extended mode), manual-reset input (MR), and push-pull active-low RESET output. It monitors single supply voltage (1.2V–5.5V), asserts reset for ≥7.6ms after VCC or MR recovery, and operates across -40°C to +125°C for automotive-grade reliability.
For engineers reviewing the MAX6751KA29+T datasheet, MAX6751KA29+T pinout, MAX6751KA29+T application, or MAX6751KA29+T equivalent, key selection criteria include its AEC-Q100 qualification, capacitor-adjustable reset/watchdog timing (CSRT/CSWT), dual-voltage monitoring capability (VCC + RESET IN), and guaranteed RESET validity down to VCC = 1V.
Technical Context
The MAX6751KA29+T implements a dual-threshold supervision architecture: one fixed 2.925V ±2% comparator for VCC and a separate 1.235V ±1.5% adjustable comparator for external voltage monitoring via RESET IN pin. Its watchdog timer supports normal mode (tWD = 4.94×10⁶ × CSWT) and extended mode (×128 scaling via WDS pin), with reset timeout tRP = 4.94×10⁶ × CSRT.
It features internal MR pullup (12–28kΩ), 100ns glitch rejection on MR, 200ns MR-to-RESET delay, and power-supply transient immunity validated up to 100mV overdrive for ≤50µs pulses. RESET output guarantees VOL ≤ 0.3V at ISINK = 50µA (VCC ≥ 1.0V) and VOH ≥ 0.8×VCC at ISOURCE = 200µA (VCC ≥ 1.8V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VCC) | 2.925V ±2% - factory-trimmed for precise brownout detection at nominal 2.925V supply |
| Reset Timeout Period | 5.7–9.5ms (CSRT = 1500pF) - ensures μP initialization completes before release |
| Watchdog Timeout (Normal) | 5.7–9.5ms (CSWT = 1500pF) - software-serviced window for standard firmware execution cycles |
| Watchdog Timeout (Extended) | 729–1214ms (CSWT = 1500pF) - 128× scaling enables long-latency system diagnostics or sleep modes |
| Supply Current | 3.7–10µA - ultra-low ICC enables battery-powered operation for >10 years in standby |
| Operating Temperature | -40°C to +125°C - fully specified for under-hood automotive and industrial embedded use |
| RESET Output Type | Push-pull active-low - eliminates external pullup, simplifies interface to 1.8V–5V μP reset inputs |
Pinout & Package
MAX6751KA29+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: MR | Manual Reset Input | Active-low input with internal 12–28kΩ pullup; 1µs minimum pulse width; rejects 100ns glitches |
| 2: WDS | Watchdog Select | Logic input selecting normal (GND) or extended (VCC) watchdog timeout mode; clears timer on state change |
| 3: SWT | Watchdog Timeout Input | Capacitor-connected node setting tWD (normal) or tWD2 (extended); formula tWD = 4.94×10⁶ × CSWT |
| 4: SRT | Reset Timeout Input | Capacitor-connected node setting tRP; formula tRP = 4.94×10⁶ × CSRT; determines reset assertion duration |
| 5: GND | Ground Reference | Primary return path for all analog and digital functions; must be low-impedance connection |
| 6: WDI | Watchdog Input | Falling-edge-triggered watchdog feed; 300ns minimum pulse width; ignored during RESET assertion |
| 7: RESET | Reset Output | Push-pull active-low output; drives μP reset pin directly; valid for VCC ≥ 1V |
| 8: VCC | Supply Voltage | Power input (1.2–5.5V); powers internal circuitry and serves as monitored rail for fixed-threshold detection |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneously monitors VCC (2.925V ±2%) and external rail via RESET IN (1.235V ±1.5%), enabling two-rail system integrity checks |
| Capacitor-adjustable timing | Independent CSRT and CSWT capacitors set reset and watchdog timeouts without trimming resistors or firmware changes |
| AEC-Q100 qualified | Qualified to Grade 0 (-40°C to +125°C) for automotive applications including engine control and ADAS sensors |
| Transient-immune reset | Guaranteed no false reset for VCC transients ≤100mV below threshold and ≤50µs duration, critical for noisy power domains |
| Low-power operation | 3.7µA typical ICC at VCC ≤ 2.0V extends battery life in portable medical and telemetry devices |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply and 5V sensor bias rail in under-hood ECU exposed to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting reset if either rail drops below threshold; provides 7.6ms reset hold time for safe μP reboot after brownout. Use Value: Prevents code corruption during 12V battery sag to 6V; extended watchdog mode (729ms) accommodates slow CAN bus diagnostic cycles. | Use Scenario: Ensures deterministic startup and runtime supervision of ARM-based controller in DIN-rail mounted PLC with isolated 24V field power. IC Role / Device Role / Timing Role: Primary reset generator with manual-reset override for field service; uses MR pin for hardware-initiated firmware recovery. Use Value: Push-pull RESET eliminates external pullup, reducing BOM count; 125°C rating supports convection-cooled enclosures without derating. |
| Portable Medical Infusion Pump | Battery-Powered Smart Meter |
Use Scenario: Supervises lithium-ion battery-backed 1.8V MCU and 3.3V display driver in Class II medical device requiring fail-safe shutdown. IC Role / Device Role / Timing Role: Low-current (3.7µA) supervisor enabling multi-year battery life; RESET output held valid down to VCC = 1V for graceful low-battery shutdown. Use Value: Guarantees controlled pump stop before battery depletion; adjustable watchdog prevents runaway motor control due to firmware lockup. | Use Scenario: Provides reset and watchdog for NB-IoT modem and metrology ASIC in AMI smart meter operating on primary lithium thionyl chloride cell. IC Role / Device Role / Timing Role: Dual-function supervisor: VCC monitor for main 3.3V rail and RESET IN monitor for backup RTC supply; capacitor-tuned timeouts match sleep/wake cycles. Use Value: Extended watchdog (1214ms) aligns with 1-second NB-IoT transmission intervals; AEC-Q100 qualification ensures 15+ year field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6750KA29+T | Same 2.925V VCC threshold and pinout, but adds factory-trimmed VCC monitor *and* adjustable RESET IN monitor - dual fixed+adjustable architecture | Required when both VCC and a second rail (e.g., 1.2V core) must be independently supervised with fixed thresholds | Select MAX6750KA29+T only if dual independent fixed-threshold monitoring is needed; MAX6751KA29+T suffices for VCC + one adjustable rail |
| TLV803EB29DBVR | Lower quiescent current (0.5µA), but fixed 2.93V threshold only (no RESET IN or watchdog), SOT23-5 package (fewer pins) | Suitable for simple single-rail reset-only applications without watchdog or manual reset | Choose TLV803EB29DBVR for cost-sensitive, ultra-low-power reset-only designs where watchdog and MR are unnecessary |
Compared with MAX6750KA29+T, MAX6751KA29+T omits the second factory-trimmed VCC monitor but retains full RESET IN adjustability and watchdog functionality - optimizing for systems needing flexible secondary rail monitoring rather than dual fixed rails. Versus TLV803EB29DBVR, it trades ultra-low ICC for comprehensive supervision features in the same footprint class.
Availability
MAX6751KA29+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, portable medical devices, battery-powered smart meters, and critical microprocessor monitoring applications requiring stable component supply across extended temperature ranges.
Supply support for MAX6751KA29+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 with precision, power, and reliability.
The MAX6746–MAX6753 product line delivers AEC-Q100-qualified microprocessor supervisors with configurable reset/watchdog timing, dual-voltage monitoring, and ultra-low power consumption - engineered for mission-critical automotive and industrial embedded systems.
FAQ
What is the exact reset threshold voltage for MAX6751KA29+T?
The MAX6751KA29+T has a factory-trimmed VCC reset threshold of 2.925V ±2% (2.867V to 2.984V) over -40°C to +125°C. This value is confirmed in Table 2 of the datasheet under suffix "29", and applies specifically to the VCC supply monitoring function. The RESET IN pin uses a separate 1.235V ±1.5% threshold for external rail monitoring.
Does MAX6751KA29+T support dual-voltage monitoring?
Yes, MAX6751KA29+T supports dual-voltage monitoring: it monitors VCC using its fixed 2.925V ±2% threshold and simultaneously monitors an external voltage via the RESET IN pin using a 1.235V ±1.5% adjustable threshold. An external resistor divider sets the external rail's trip point, enabling supervision of two independent supplies such as 3.3V logic and 1.2V core rails.
How do I configure the watchdog timeout for MAX6751KA29+T?
Configure the watchdog timeout for MAX6751KA29+T by connecting capacitor CSWT between SWT pin (pin 3) and GND. For normal mode (WDS = GND), tWD = 4.94×10⁶ × CSWT seconds. For extended mode (WDS = VCC), multiply tWD by 128. Example: CSWT = 100pF yields 494ms normal or 63.2s extended timeout. Do not leave SWT floating - connect to GND to disable watchdog.
Is MAX6751KA29+T AEC-Q100 qualified?
Yes, MAX6751KA29+T is AEC-Q100 qualified per Grade 0 specifications (-40°C to +125°C ambient), as explicitly stated in the Benefits and Features section and confirmed in the Absolute Maximum Ratings table. This qualification covers the full electrical performance, reliability testing, and thermal specifications required for automotive under-hood applications.
What is the function of the MR pin on MAX6751KA29+T?
The MR (Manual Reset) pin on MAX6751KA29+T is an active-low input with internal 12–28kΩ pullup to VCC. Pulling MR low for ≥1µs asserts RESET for the full reset timeout period (e.g., 7.6ms with CSRT = 1500pF). It rejects 100ns glitches and requires no external components - ideal for front-panel reset buttons or system-level fault recovery signals.
MAX6751KA29+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:
- 2.925V, 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
MAX6751KA29+T FAQ
1.How can I place an order for MAX6751KA29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6751KA29+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 MAX6751KA29+T reliable?
The price and inventory of MAX6751KA29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6751KA29+T is usually 5 days.
3.What payment methods are accepted for MAX6751KA29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6751KA29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6751KA29+T?
MAX6751KA29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6751KA29+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 MAX6751KA29+T?
For technical support, including MAX6751KA29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6751KA29+T requirements.
6.How does Aetrix verify that MAX6751KA29+T is sourced from the original manufacturer or authorized distributors?
All MAX6751KA29+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 MAX6751KA29+T meets industry standards.
7.What is the process for return or replacement of MAX6751KA29+T?
All MAX6751KA29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6751KA29+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 MAX6751KA29+T part is unused and in its original packaging.
Return procedure for MAX6751KA29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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