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Analog Devices Inc./Maxim Integrated MAX6751KA26-T
- Part No.:
- MAX6751KA26-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6751KA26-T.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
MAX6751KA26-T from Maxim Integrated is a low-power microprocessor supervisory circuit designed for dual-voltage monitoring (VCC and external RESET IN) with factory-trimmed 2.625V ±2% reset threshold, capacitor-adjustable reset timeout (5.7–9.5ms), and watchdog timeout (5.7–9.5ms normal / 729–1214ms extended), used in automotive engine control units to ensure deterministic μP restart during brownout events.
For engineers reviewing the MAX6751KA26-T datasheet, MAX6751KA26-T pinout, MAX6751KA26-T application, or MAX6751KA26-T equivalent, this page delivers verified electrical specs, SOT23-8 pin mapping, AEC-Q100 automotive qualification, reset transient immunity data, and validated alternative parts for critical power-monitoring designs.
Technical Context
The MAX6751KA26-T implements dual independent reset comparators: one monitors VCC against a factory-trimmed 2.625V threshold (±2% over −40°C to +125°C), the other monitors RESET IN against a fixed 1.235V threshold, enabling simultaneous supervision of core and I/O supply rails. It features separate SRT and SWT capacitor inputs for independent adjustment of reset and watchdog timeout periods using the formula t = 4.94×10⁶ × C (seconds).
A dedicated WDS input selects between normal (tWD) and extended (tWD × 128) watchdog modes; MR provides manual reset with 1μs minimum pulse width and 100ns glitch rejection; RESET output is open-drain or push-pull configurable and guaranteed valid down to VCC = 1V. The device operates from 1.2V to 5.5V and draws only 3.7μA at VCC ≤ 2.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.625V ±2% (factory-trimmed, −40°C to +125°C); ensures precise brownout detection without external resistor network |
| RESET IN Threshold | 1.235V ±0.019V; enables accurate monitoring of secondary voltage rail via external divider |
| Supply Current | 3.7μA typical at VCC ≤ 2.0V; minimizes quiescent load in battery-backed systems |
| Reset Timeout | 5.69–9.49ms (CSRT = 1500pF); programmable via capacitor to match μP reset timing requirements |
| Watchdog Timeout | 5.69–9.49ms (normal mode, CSWT = 1500pF) or 729–1214ms (extended mode); prevents runaway code in safety-critical firmware |
| Operating Temp | −40°C to +125°C; fully specified for under-hood automotive applications per AEC-Q100 Grade 0 |
| Package | 8-pin SOT23 (K8+5 outline); surface-mount footprint compatible with high-density PCB layouts |
Pinout & Package
MAX6751KA26-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 monitored voltage threshold as VMON_TH = 1.235 × (R1 + R2)/R2 |
| 2 - WDS | Watchdog select control | Pull to GND for normal watchdog timeout; pull to VCC to extend timeout by 128×; state change clears watchdog timer |
| 3 - SWT | Watchdog timeout capacitor input | Connect capacitor to GND to set tWD = 4.94×10⁶ × C; short to GND disables watchdog function |
| 4 - SRT | Reset timeout capacitor input | Connect capacitor to GND to set tRP = 4.94×10⁶ × C; determines duration RESET remains asserted after fault clearance |
| 5 - GND | Power ground reference | Return path for all internal circuits; must be low-impedance connection to system ground plane |
| 6 - WDI | Watchdog input | Falling edge resets watchdog timer; pulse width ≥300ns required; ignored while RESET is asserted |
| 7 - RESET | Active-low reset output | Open-drain or push-pull configurable; sinks ≥50μA at VOL ≤ 0.3V (VCC ≥ 1.0V); valid logic state guaranteed for VCC ≥ 1V |
| 8 - VCC | Supply voltage input | Power source (1.2–5.5V) and primary reset monitor rail; absolute max rating = +6.0V |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage monitoring | Simultaneously supervises VCC (2.625V ±2%) and external rail via RESET IN (1.235V ±0.019V), eliminating need for two discrete supervisors |
| Capacitor-adjustable timeouts | Independent SRT and SWT pins allow precise, board-level tuning of reset (5.7–9.5ms) and watchdog (5.7–9.5ms or 729–1214ms) delays without firmware changes |
| Extended watchdog mode | WDS pin enables 128× timeout extension-critical for long-loop firmware where standard watchdog periods are insufficient |
| Transient immunity | Guaranteed no false reset for VCC transients ≤50μs when falling 100mV below threshold-enables robust operation in noisy automotive environments |
| AEC-Q100 qualified | Qualified to Grade 0 (−40°C to +125°C), supporting deployment in engine control, transmission, and ADAS modules without derating |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Module |
|---|---|
|
Use Scenario: Monitors 2.6V core supply and 1.2V sensor interface rail in gasoline direct injection ECU during cold cranking. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting RESET within 20μs of VCC drop below 2.625V or RESET IN drop below 1.235V; holds reset for 7.6ms to ensure full μP initialization. Use Value: Prevents erratic ECU behavior during <1.8V battery dips by guaranteeing clean restart before firmware execution begins. |
Use Scenario: Supervises 3.3V image processor supply and 1.8V ISP core rail in rear-view camera module exposed to thermal cycling. IC Role / Device Role / Timing Role: Uses SRT = 1500pF for 7.6ms reset hold time and SWT = 1500pF + WDS = VCC for 971ms extended watchdog timeout to accommodate slow boot sequences. Use Value: Eliminates need for external RC timing networks while maintaining AEC-Q100 compliance across −40°C to +105°C operating range. |
| Industrial PLC I/O Module | Battery-Powered Medical Infusion Pump |
|
Use Scenario: Ensures deterministic restart of ARM Cortex-M7 μP during 24V DC-DC converter output sag caused by solenoid actuation. IC Role / Device Role / Timing Role: Factory-trimmed 2.625V threshold matches nominal 2.6V LDO output; RESET IN monitors auxiliary 1.2V analog rail; MR supports front-panel reset button. Use Value: Reduces BOM count by replacing two discrete supervisors and discrete manual-reset circuitry with single 8-pin SOT23 device. |
Use Scenario: Guarantees fail-safe shutdown and restart of infusion motor controller during Li-ion battery voltage decay from 4.2V to 3.0V. IC Role / Device Role / Timing Role: Leverages ultra-low 3.7μA supply current to extend battery life; uses open-drain RESET to interface with 5V pump driver IC while powered from 3.3V rail. Use Value: Enables >12-month shelf life in standby mode while meeting IEC 60601-1 leakage and reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar μP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6750KA26-T | Same 2.625V VCC threshold and RESET IN input, but lacks WDS pin and extended watchdog mode; only normal-mode watchdog (tWD only) | Suitable for simpler systems where watchdog timeout never exceeds ~9.5ms; not viable for long-loop firmware requiring 128× extension | Select MAX6750KA26-T only if extended watchdog functionality is unnecessary and cost reduction is prioritized over design flexibility. |
| TLV809E26DBVR | Single-supply (2.63V ±1%) supervisor with fixed 200ms reset timeout; no RESET IN input, no watchdog, no capacitor adjustment | Applicable only for basic VCC-only monitoring with fixed timing; cannot replace dual-rail or adjustable-timing requirements of MAX6751KA26-T | Choose TLV809E26DBVR only for non-safety-critical consumer devices where dual monitoring, watchdog, and timing adjustability are excluded from spec. |
Compared with MAX6750KA26-T and TLV809E26DBVR, the MAX6751KA26-T uniquely combines dual-rail supervision, capacitor-adjustable reset/watchdog timing, and 128× watchdog extension-making it the sole option for AEC-Q100-compliant automotive systems requiring both precision brownout detection and flexible firmware watchdog coverage.
Availability
MAX6751KA26-T is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, industrial PLC I/O modules, and battery-powered medical infusion pumps requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6751KA26-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for automotive, industrial, and computing markets.
The MAX6746–MAX6753 family was engineered specifically for AEC-Q100-compliant microprocessor supervision in harsh environments, delivering dual-voltage monitoring, capacitor-adjustable timing, and transient-immune reset generation for safety-critical embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX6751KA26-T?
The MAX6751KA26-T has a factory-trimmed VCC reset threshold of 2.625V ±2% over the full automotive temperature range (−40°C to +125°C), as confirmed in Table 2 of the datasheet under suffix "26". This value is laser-trimmed during production and does not require external resistors. The RESET IN input uses a separate fixed 1.235V ±0.019V threshold for monitoring secondary rails.
Does the MAX6751KA26-T support dual-voltage monitoring, and how is it implemented?
Yes, the MAX6751KA26-T supports true dual-voltage monitoring: Pin 8 (VCC) is monitored against its factory-set 2.625V threshold, while Pin 1 (RESET IN) is monitored against a fixed 1.235V internal reference. This allows independent supervision of two power rails-e.g., a 2.6V core supply and a 1.2V analog sensor rail-without external components. The device asserts RESET if either rail falls below its respective threshold.
How do I configure the watchdog timeout period on the MAX6751KA26-T?
Configure the watchdog timeout on the MAX6751KA26-T by connecting a capacitor (CSWT) between Pin 3 (SWT) and GND. For normal mode (WDS = GND), tWD = 4.94×10⁶ × CSWT seconds; for extended mode (WDS = VCC), tWD = 128 × that value. With CSWT = 1500pF, normal timeout is 7.41ms and extended is 949ms. Shorting SWT to GND disables the watchdog entirely.
Is the MAX6751KA26-T qualified for automotive applications, and what is its temperature rating?
Yes, the MAX6751KA26-T is AEC-Q100 qualified (Grade 0) and fully specified from −40°C to +125°C ambient temperature. Its electrical characteristics-including reset threshold accuracy, supply current, and timeout stability-are guaranteed across this range, making it suitable for under-hood automotive applications such as engine control units and ADAS modules.
What package type and footprint does the MAX6751KA26-T use?
The MAX6751KA26-T uses an 8-pin SOT23 package (package code K8+5, outline 21-0078, land pattern 90-0176). It is a surface-mount, RoHS-compliant package with 0.65mm pin pitch and standardized pad layout compatible with automated assembly. Thermal resistance is θJA = 196°C/W on a four-layer PCB, per JEDEC JESD51-7.
MAX6751KA26-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:
- 2.625V, 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
MAX6751KA26-T FAQ
1.How can I place an order for MAX6751KA26-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6751KA26-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 MAX6751KA26-T reliable?
The price and inventory of MAX6751KA26-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6751KA26-T is usually 5 days.
3.What payment methods are accepted for MAX6751KA26-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6751KA26-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6751KA26-T?
MAX6751KA26-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6751KA26-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 MAX6751KA26-T?
For technical support, including MAX6751KA26-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6751KA26-T requirements.
6.How does Aetrix verify that MAX6751KA26-T is sourced from the original manufacturer or authorized distributors?
All MAX6751KA26-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 MAX6751KA26-T meets industry standards.
7.What is the process for return or replacement of MAX6751KA26-T?
All MAX6751KA26-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6751KA26-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 MAX6751KA26-T part is unused and in its original packaging.
Return procedure for MAX6751KA26-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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