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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 UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:7,134
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Product details
Overview
MAX6751KA29-T from Maxim Integrated is a low-power microprocessor supervisory circuit designed for dual-voltage monitoring (VCC and external RESET IN) with factory-trimmed 2.925V ±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 reliable μP restart during brownout events.
For engineers reviewing the MAX6751KA29-T datasheet, MAX6751KA29-T pinout, MAX6751KA29-T application, or MAX6751KA29-T equivalent, this page delivers verified electrical specs, SOT23-8 pin mapping, AEC-Q100 automotive qualification, transient-immune reset assertion down to VCC ≥ 1V, and capacitor-based timing configuration guidance.
Technical Context
The MAX6751KA29-T implements dual-supply supervision: one path monitors VCC against its factory-set 2.925V threshold, while a second high-impedance comparator monitors an externally derived voltage via RESET IN (1.235V threshold). Both paths feed into a shared reset logic block that asserts active-low RESET for a user-defined timeout after any threshold violation.
Its watchdog function operates in two modes-normal (capacitor-timed tWD) and extended (128× tWD via WDS pin)-and clears on WDI falling edges or RESET assertion. The device uses internal ramp-current comparators (250nA typical) on SRT/SWT pins to convert external capacitor values into precise timeout periods per t = 4.94×10⁶ × C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.925V ±2% (factory-trimmed); ensures accurate brownout detection at nominal 3.3V rail without external resistors. |
| Supply Voltage Range | 1.2V to 5.5V; supports operation across battery-backed 1.8V logic and 5V legacy systems. |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V; enables multi-year battery life in portable automotive sensors. |
| Reset Timeout Period | 5.69–9.49ms (CSRT = 1500pF); configurable via external capacitor to match μP power-up sequence timing. |
| Watchdog Timeout | 5.69–9.49ms (normal mode, CSWT = 1500pF) or 729–1214ms (extended mode); prevents firmware lockup in safety-critical ECUs. |
| Operating Temperature | -40°C to +125°C; fully specified for under-hood automotive environments per AEC-Q100 Grade 0. |
| RESET Output Type | Open-drain or push-pull active-low; allows flexible interface to 1.8V/3.3V/5V μP reset inputs with external pull-up. |
Pinout & Package
MAX6751KA29-T is housed in an 8-pin SOT23 package (package code K8+5, outline 21-0078), optimized for space-constrained automotive PCBs with thermal resistance θJA = 196°C/W on four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | Adjustable voltage monitor input | High-impedance node (±1nA leakage) for external resistor-divider; sets secondary reset threshold at 1.235V reference. |
| 2 - GND | Ground reference | Common return for all analog and digital functions; must be low-inductance connection to minimize noise coupling. |
| 3 - VCC | Main supply input | Power source for internal circuitry and VCC-monitoring path; accepts 1.2–5.5V with guaranteed RESET validity down to 1V. |
| 4 - RESET | Active-low reset output | Open-drain or push-pull output; sinks ≥50µA at VOL ≤ 0.3V (VCC ≥ 1.0V) to drive μP reset pin reliably. |
| 5 - SWT | Watchdog timeout capacitor terminal | Connects to ground via CSWT; sets watchdog period using tWD = 4.94×10⁶ × CSWT (seconds). |
| 6 - SRT | Reset timeout capacitor terminal | Connects to ground via CSRT; sets reset hold time using tRP = 4.94×10⁶ × CSRT (seconds). |
| 7 - WDS | Watchdog mode select | Pulled to GND for normal mode; pulled to VCC for 128× extended timeout; state change clears watchdog timer. |
| 8 - WDI | Watchdog input | Falling-edge-triggered; must toggle within selected watchdog window or RESET asserts for full tRP duration. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneously monitors VCC (2.925V threshold) and external rail via RESET IN (1.235V reference), enabling independent fault detection for multi-rail systems. |
| Capacitor-adjustable timing | Reset and watchdog timeouts set by single external capacitors (CSRT/CSWT), eliminating trimming resistors and simplifying BOM. |
| 128× watchdog extension | WDS pin selects extended mode, increasing timeout from ~8ms to ~970ms-ideal for long-loop firmware without hardware changes. |
| Power-supply transient immunity | Rejects VCC glitches ≤50µs when 100mV below threshold, reducing false resets in noisy automotive electrical environments. |
| AEC-Q100 qualification | Qualified to Grade 0 (-40°C to +125°C), including HTOL, TC, ESD, and AC/DC stress tests-meets automotive reliability requirements. |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply and 5V motor driver rail during cold cranking (battery dip to 6V). IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting RESET if either rail falls below spec, holding reset for 8ms to ensure clean μP boot. Use Value: Prevents erratic ECU behavior during voltage sags by guaranteeing deterministic restart before firmware executes. |
Use Scenario: Ensures safe shutdown of pump motor drivers when main 24V supply drops below 22V during battery swap. IC Role / Device Role / Timing Role: Uses RESET IN pin to monitor external 24V-derived 3.3V rail; triggers watchdog if motor control loop stalls. Use Value: Eliminates need for discrete voltage dividers and timers, reducing component count and failure points in Class II medical devices. |
| Industrial PLC I/O Module | Battery-Powered Telematics Gateway |
Use Scenario: Supervises isolated 5V logic supply and 24V field bus interface in harsh factory environments with EMI. IC Role / Device Role / Timing Role: Leverages transient immunity to ignore 100ns–50µs supply noise while detecting sustained brownouts. Use Value: Maintains system uptime by avoiding spurious resets caused by relay switching transients on shared 24V bus. |
Use Scenario: Manages wake/sleep cycles of LTE modem and GPS receiver powered by Li-ion battery (3.0–4.2V range). IC Role / Device Role / Timing Role: Configured with 100pF CSRT for 506µs reset delay and 1500pF CSWT for 7.6ms watchdog, matching modem firmware latency. Use Value: Extends battery life via ultra-low 3.7µA quiescent current while ensuring modem recovery from software hangs. |
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 dual-monitor architecture, but lacks WDS pin and extended watchdog mode. | Suitable only where fixed watchdog timeout suffices; cannot support long-loop firmware requiring 128× extension. | Select MAX6750KA29-T if extended watchdog is unnecessary and pin count must be minimized (no WDS required). |
| TLV809E29DBVR | Single-supply 2.93V reset IC with fixed 200ms timeout; no adjustable timing, no watchdog, no RESET IN input. | Limited to basic VCC-only monitoring; cannot replace dual-rail or watchdog functionality of MAX6751KA29-T. | Choose TLV809E29DBVR only for cost-sensitive, non-safety-critical applications needing only simple power-on reset. |
Compared with MAX6750KA29-T and TLV809E29DBVR, the MAX6751KA29-T uniquely combines factory-trimmed dual-voltage supervision, capacitor-adjustable reset/watchdog timing, and 128× watchdog extension-making it the only option among the three qualified for AEC-Q100 automotive systems requiring adaptive fault recovery.
Availability
MAX6751KA29-T is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pump controllers, industrial PLC I/O modules, and battery-powered telematics gateways requiring stable component supply across extended temperature ranges and long production lifecycles.
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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for automotive, industrial, and medical applications, emphasizing high reliability, low power, and AEC-Q100 compliance.
The MAX6746–MAX6753 product line delivers capacitor-configurable μP supervisors targeting automotive and safety-critical embedded systems where programmable timing, dual-rail monitoring, and transient immunity are mandatory.
FAQ
What is the exact reset threshold voltage of the MAX6751KA29-T?
The MAX6751KA29-T features a factory-trimmed VCC reset threshold of 2.925V ±2% over -40°C to +125°C. This value is confirmed in Table 2 of the datasheet (suffix "29") and applies specifically to the VCC monitoring path. The RESET IN input has a separate fixed 1.235V threshold used for external rail monitoring.
How do I configure the reset timeout period for the MAX6751KA29-T?
Connect a capacitor (CSRT) between the SRT pin (Pin 6) and GND. The reset timeout period is calculated as tRP = 4.94 × 10⁶ × CSRT seconds. For example, a 1500pF capacitor yields 7.41ms (typical). Use low-leakage ceramic capacitors; avoid electrolytics due to leakage-induced timing errors.
Does the MAX6751KA29-T support watchdog functionality, and how is it enabled?
Yes, the MAX6751KA29-T includes a capacitor-adjustable watchdog timer. Connect a capacitor (CSWT) between SWT (Pin 5) and GND to set the base timeout. Then use the WDS pin (Pin 7): tie to GND for normal mode (~8ms with 1500pF) or to VCC for 128× extended mode (~970ms). A falling edge on WDI (Pin 8) clears the timer.
Is the MAX6751KA29-T qualified for automotive applications?
Yes, the MAX6751KA29-T is AEC-Q100 qualified (Grade 0) and fully specified over -40°C to +125°C. It meets automotive reliability standards including HTOL, temperature cycling, and ESD testing, making it suitable for under-hood and dashboard-mounted electronic control units.
Can the MAX6751KA29-T monitor two different supply voltages simultaneously?
Yes, the MAX6751KA29-T performs true dual-voltage monitoring: its VCC pin monitors the 2.925V threshold directly, while the RESET IN pin (Pin 1) monitors an external voltage using a 1.235V internal reference-enabling independent supervision of two rails such as 3.3V logic and 5V I/O in automotive ECUs.
MAX6751KA29-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:
- 2.925V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 5.692ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- 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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