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Analog Devices Inc./Maxim Integrated MAX6751KA29
- Part No.:
- MAX6751KA29
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6751KA29.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:1,780
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Product details
Overview
MAX6751KA29 from Maxim Integrated is a capacitor-adjustable microprocessor supervisory circuit with dual-voltage monitoring (VCC and external RESET IN), factory-trimmed 2.925V ±2% VCC reset threshold, and adjustable watchdog timeout via SWT pin. It asserts an active-low RESET output for programmable duration after brownout, manual reset, or watchdog fault-used in automotive engine control units requiring robust power-up sequencing and fail-safe restart under transient conditions.
For engineers reviewing the MAX6751KA29 datasheet, MAX6751KA29 pinout, MAX6751KA29 application, or MAX6751KA29 equivalent, this device supports precise reset timing calibration, immunity to sub-50µs VCC transients at 100mV overdrive, dual-supply monitoring for rail redundancy validation, and automotive-grade operation from −40°C to +125°C.
Technical Context
The MAX6751KA29 integrates a fixed 2.925V ±2% VCC monitor and an adjustable RESET IN comparator (1.235V threshold) enabling dual-rail supervision-e.g., monitoring both 3.3V core and 1.8V I/O supplies. Its reset timeout (tRP) and watchdog timeout (tWD) are independently set via external capacitors CSRT and CSWT using the linear scaling factor 5.06×10⁶ s/F.
This variant includes manual reset (MR) input with 1µs minimum pulse width and 100ns glitch rejection, push-pull RESET output guaranteed functional down to VCC = 1V, and WDS-controlled 128× watchdog extension-distinguishing it from windowed watchdog variants (MAX6752/MAX6753) and non-MR versions (MAX6748/MAX6749).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.925V ±2% (factory-trimmed); ensures reliable reset assertion during 3.3V rail brownout with ±58.5mV tolerance. |
| RESET IN Threshold | 1.235V ±1.5%; enables precise external voltage monitoring (e.g., 1.8V supply via resistor divider) independent of VCC. |
| Supply Current | 3.7µA at VCC ≤ 2.0V; ultra-low quiescent draw preserves battery life in always-on automotive modules. |
| Reset Timeout Range | 0.506ms to 9.487ms (CSRT = 100pF to 1500pF); covers µP initialization windows from fast Cortex-M0 to legacy 8051. |
| Watchdog Timeout Range | 0.506ms–9.487ms normal / 64.77ms–1214.4ms extended (CSWT = 100pF–1500pF); supports software service intervals from 1ms to >1s. |
| Operating Temperature | −40°C to +125°C; qualified for under-hood automotive applications per AEC-Q100 stress requirements. |
| RESET Output Type | Push-pull active-low; eliminates external pull-up resistor, simplifies interface to µP reset pins with rail-to-rail drive. |
Pinout & Package
MAX6751KA29 is housed in an 8-pin SOT23-8 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained automotive PCBs and compatible with standard reflow profiles including lead-free soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Manual Reset Input | Internally pulled up to VCC; falling edge ≥1µs asserts RESET-enables hardware reset button without external components. |
| 2 - RESET IN | Adjustable Reset Comparator Input | High-impedance node (±1nA leakage); connects to resistor divider to set external voltage threshold (e.g., 1.8V rail). |
| 3 - SWT | Watchdog Timeout Capacitor Input | Connects to ground via CSWT; sets basic watchdog period tWD = 5.06×10⁶ × CSWT (seconds), extendable 128× via WDS. |
| 4 - SRT | Reset Timeout Capacitor Input | Connects to ground via CSRT; sets reset pulse width tRP = 5.06×10⁶ × CSRT (seconds); decouples reset timing from watchdog logic. |
| 5 - GND | Ground Reference | Common return for all analog and digital functions; requires low-impedance PCB connection to minimize noise coupling. |
| 6 - WDS | Watchdog Select Input | Pulled to GND for normal mode (tWD), to VCC for extended mode (128×tWD); state change clears watchdog timer. |
| 7 - RESET | Active-Low Reset Output | Push-pull driver; sinks ≥3.2mA at VCC ≥4.5V; guarantees valid logic state for VCC ≥1V-critical for brownout recovery. |
| 8 - VCC | Power Supply Input | Monitored supply rail (1.2V–5.5V); powers internal circuitry and provides reference for VCC reset comparator. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Voltage Monitoring | Simultaneously supervises VCC (2.925V fixed) and external rail via RESET IN (1.235V reference), enabling rail redundancy checks in multi-supply systems. |
| Capacitor-Adjustable Timing | Independent CSRT and CSWT capacitors allow precise, board-level tuning of reset and watchdog timeouts without firmware changes. |
| Transient Immunity | Rejects VCC glitches ≤50µs when overdriven 100mV below threshold-prevents spurious resets during load-dump or ignition transients. |
| Automotive Temperature Range | Full −40°C to +125°C operation with guaranteed parametric performance, eliminating derating calculations for under-hood deployment. |
| Low-Power Operation | 3.7µA supply current at 1.8V enables use in always-on vehicle networks (e.g., CAN wake-up circuits) without compromising battery standby life. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Module |
|---|---|
Use Scenario: Monitors 5V sensor supply and 3.3V microcontroller rail during cold cranking, where battery dips to 6V with high ripple. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting RESET until both rails stabilize above thresholds, with 5ms timeout ensuring full µP boot sequence completion. Use Value: Prevents ECU lockup during start-stop cycles by rejecting <50µs transients while guaranteeing reset hold time exceeds processor POR requirement. |
Use Scenario: Powers on image sensor and ISP ASIC; must survive ISO 7637-2 pulse 5a (load dump) without false reset. IC Role / Device Role / Timing Role: Push-pull RESET drives ASIC reset pin directly; 2.925V VCC threshold matches 3.3V LDO output, while RESET IN monitors 1.2V core rail. Use Value: Eliminates external pull-up and level-shifter, reducing BOM count; 125°C rating supports placement near heat-generating image sensor. |
| Telematics Control Unit (TCU) | Electric Power Steering (EPS) Controller |
Use Scenario: Maintains cellular modem and GNSS receiver operation during vehicle ignition, where 12V bus experiences 200ms dips to 5.5V. IC Role / Device Role / Timing Role: MR pin connected to ignition switch signal; asserts RESET on key-on to synchronize modem boot with vehicle power-up sequence. Use Value: Hardware-triggered reset ensures deterministic modem initialization timing, avoiding race conditions with CAN bus startup. |
Use Scenario: Supervises safety-critical 5V MCU supply and 1.5V FPGA configuration rail in torque-assist path. IC Role / Device Role / Timing Role: Watchdog timeout set to 100ms via CSWT; WDI fed by FPGA heartbeat signal to detect logic lockup within fail-safe time budget. Use Value: 128× extended mode allows single capacitor value to cover both nominal (100ms) and fault-tolerant (12.8s) watchdog windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6750KA29 | Same 2.925V VCC threshold and dual-monitoring capability, but lacks MR pin-requires external reset switch circuitry. | Suitable for designs where manual reset is implemented via system-level GPIO rather than dedicated hardware button. | Select MAX6750KA29 only if MR functionality is unnecessary and PCB layout prioritizes minimal external components for RESET IN path. |
| TLV803EB29DBVR | Fixed 2.93V reset threshold, no adjustable RESET IN, no watchdog, SOT-23-5 package-simpler function set and smaller footprint. | Applicable in cost-sensitive, single-rail applications like body control modules where watchdog is handled by µP firmware. | Choose TLV803EB29DBVR when dual monitoring, capacitor-adjustable timing, and hardware watchdog are not required. |
Compared with MAX6751KA29, MAX6750KA29 removes manual reset capability but retains identical dual-supply supervision and timing adjustability, whereas TLV803EB29DBVR reduces feature count to basic reset-only operation in a smaller 5-pin package-making it suitable only for non-safety-critical, single-rail use cases.
Availability
MAX6751KA29 is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, telematics control units, and electric power steering controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6751KA29 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 communications markets, emphasizing high reliability and extended temperature performance.
The MAX6746–MAX6753 product line delivers capacitor-programmable supervisory circuits targeting automotive and industrial systems needing configurable reset and watchdog timing with AEC-Q100 qualification.
FAQ
What is the exact factory-trimmed reset threshold voltage for MAX6751KA29?
The MAX6751KA29 has a factory-trimmed VCC reset threshold of 2.925V with ±2% tolerance (2.867V to 2.984V) across −40°C to +125°C. This value is confirmed in Table 2 of the datasheet under suffix "29" and applies specifically to the MAX6751KA29-not inferred from adjacent suffixes. The RESET IN threshold remains fixed at 1.235V ±1.5%.
Does MAX6751KA29 support dual-voltage monitoring, and how is it configured?
Yes, MAX6751KA29 supports dual-voltage monitoring: VCC is monitored against its 2.925V threshold, while RESET IN monitors an external voltage via a resistor divider referenced to the internal 1.235V comparator. Configuration requires connecting RESET IN to the divider's center tap-no additional components needed. This enables simultaneous supervision of, e.g., a 3.3V MCU rail and 1.8V I/O rail.
How do I calculate the capacitor values for reset and watchdog timeout on MAX6751KA29?
Use CSRT = tRP / 5.06×10⁶ for reset timeout (tRP in seconds) and CSWT = tWD / 5.06×10⁶ for basic watchdog timeout (tWD in seconds). For extended mode (WDS = VCC), multiply tWD by 128 before calculating CSWT. Example: 100ms reset → CSRT = 100×10⁻³ / 5.06×10⁶ = 19.8nF; 1s extended watchdog → CSWT = (1/128) / 5.06×10⁶ ≈ 1.54nF.
Is the RESET output of MAX6751KA29 push-pull or open-drain, and what are its drive capabilities?
The MAX6751KA29 features a push-pull active-low RESET output. It guarantees VOL ≤ 0.4V at VCC ≥ 4.5V and ISINK = 3.2mA, and VOH ≥ 0.8×VCC at ISOURCE = 800µA. This eliminates need for external pull-up resistors and ensures direct interface to µP reset pins-even during brownout (VCC ≥ 1V).
What is the purpose of the WDS pin on MAX6751KA29, and how does it affect watchdog behavior?
The WDS pin on MAX6751KA29 selects watchdog mode: grounded for normal timeout (tWD), tied to VCC for extended mode (128×tWD). A state change on WDS clears the watchdog timer. This allows one capacitor value to serve both short-interval firmware servicing (e.g., 10ms) and long-duration fault detection (e.g., 1.28s), enhancing design flexibility without changing BOM.
MAX6751KA29 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 FAQ
1.How can I place an order for MAX6751KA29 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6751KA29 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 reliable?
The price and inventory of MAX6751KA29 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6751KA29 is usually 5 days.
3.What payment methods are accepted for MAX6751KA29?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6751KA29 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6751KA29?
MAX6751KA29 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6751KA29 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?
For technical support, including MAX6751KA29 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6751KA29 requirements.
6.How does Aetrix verify that MAX6751KA29 is sourced from the original manufacturer or authorized distributors?
All MAX6751KA29 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 meets industry standards.
7.What is the process for return or replacement of MAX6751KA29?
All MAX6751KA29 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6751KA29, 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 part is unused and in its original packaging.
Return procedure for MAX6751KA29:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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