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Analog Devices Inc./Maxim Integrated MAX6750KA29/V+T
- Part No.:
- MAX6750KA29/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6750KA29/V+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6750KA29/V+T from Analog Devices is a dual-voltage microprocessor supervisory IC with factory-trimmed 2.925V VCC reset threshold (±2%), adjustable RESET IN monitoring, capacitor-programmable reset timeout (5.7–9.5ms), and standard watchdog timer. It asserts active-low RESET during VCC brownout, RESET IN undervoltage, or manual reset, and sustains reset for the full timeout period after recovery - critical for reliable boot in automotive engine control units.
For engineers reviewing the MAX6750KA29/V+T datasheet, MAX6750KA29/V+T pinout, MAX6750KA29/V+T application, or MAX6750KA29/V+T equivalent, this device delivers AEC-Q100 qualified dual-supply monitoring, transient-immune reset assertion down to VCC ≥ 1V, and configurable watchdog timing - key selection criteria for safety-critical embedded controllers requiring deterministic power-on sequencing and fault recovery.
Technical Context
The MAX6750KA29/V+T integrates two independent reset comparators: one monitors VCC against a factory-trimmed 2.925V threshold (±2% over −40°C to +125°C), while the second monitors an external voltage via RESET IN with 1.235V ±0.8% threshold. Its reset timeout (tRP) and watchdog timeout (tWD) are set by external capacitors CSRT and CSWT using linear scaling formulas (tRP = 4.94×10⁶ × CSRT).
This variant belongs to the MAX6750/MAX6751 subgroup featuring dual-voltage supervision (VCC + RESET IN), standard watchdog (not windowed), push-pull RESET output, and no manual-reset input. It lacks SET0/SET1 pins and WDS functionality - distinguishing it from MAX6752/MAX6753 window-watchdog variants and MAX6746/MAX6747 manual-reset variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VCC) | 2.925V ±2% - ensures precise brownout detection at nominal 3.3V rail without external resistor network |
| RESET IN Threshold | 1.235V ±0.8% - enables accurate monitoring of secondary supply (e.g., 1.8V core) via external divider |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V - minimizes quiescent load in battery-backed systems |
| Reset Timeout Range | 0.51–9.49ms (CSRT = 100pF–1500pF) - supports µP power-up delays from fast MCUs to complex SoCs |
| Watchdog Timeout Range | 0.51–9.49ms (CSWT = 100pF–1500pF) - matches software service intervals without firmware modification |
| Operating Temp | −40°C to +125°C - fully specified for under-hood automotive applications per AEC-Q100 Grade 0 |
| RESET Output Type | Push-pull active-low - eliminates external pull-up resistor, simplifies interface to 1.8V/3.3V/5V µP reset inputs |
Pinout & Package
MAX6750KA29/V+T is housed in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176), RoHS-compliant, with 0.65mm pitch and 2.9mm × 1.6mm footprint - optimized for space-constrained automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET IN | High-impedance input for external voltage monitoring; connects to center tap of R1/R2 divider to set VMON_TH = 1.235 × (R1+R2)/R2 |
| 2 | GND | Ground reference for all internal comparators, timers, and output driver |
| 3 | SWT | Watchdog timeout capacitor node; tWD = 4.94×10⁶ × CSWT (seconds) - sets watchdog service interval |
| 4 | SRT | Reset timeout capacitor node; tRP = 4.94×10⁶ × CSRT (seconds) - defines minimum reset pulse width |
| 5 | VCC | Main supply input (1.2–5.5V); powers internal circuitry and provides reference for VCC comparator |
| 6 | RESET | Push-pull active-low reset output; sinks 50µA @ 0.3V max VOL, sources 200µA @ 0.8×VCC min VOH |
| 7 | WDI | Watchdog input; falling edge resets timer; must be pulled to GND via 100kΩ if unused |
| 8 | NC | No connect - pin 8 is unconnected in MAX6750; not bonded internally |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises VCC (2.925V fixed) and external supply (via RESET IN), enabling robust multi-rail system validation |
| Capacitor-adjustable timing | Separate SRT and SWT pins allow independent tuning of reset and watchdog timeouts using low-leakage ceramic capacitors |
| Power-supply transient immunity | Rejects VCC glitches ≤50µs when 100mV below threshold - prevents spurious resets in noisy automotive environments |
| AEC-Q100 Grade 0 qualification | Validated for −40°C to +125°C operation with guaranteed parametric performance - meets automotive functional safety requirements |
| Guaranteed RESET validity down to VCC = 1V | Ensures deterministic reset assertion even during deep brownout, eliminating race conditions in power-fail recovery |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Module |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply and 1.2V image sensor core rail during cold cranking (battery dips to 6V). IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting synchronized RESET to MCU and FPGA upon either rail collapse, with 8ms timeout ensuring full initialization. Use Value: Prevents corrupted firmware execution during voltage sag by guaranteeing reset pulse exceeds processor's minimum reset hold time. |
Use Scenario: Ensures clean boot of vision processor after ignition cycle, while detecting intermittent dropout on 1.8V ISP supply. IC Role / Device Role / Timing Role: Resets processor via push-pull output when VCC falls below 2.925V or RESET IN drops below 1.235V, with watchdog servicing every 5ms. Use Value: Eliminates need for discrete reset ICs and level shifters - single device handles dual-rail monitoring and noise-immune reset generation. |
| Automotive Body Control Module (BCM) | Telematics Control Unit (TCU) |
Use Scenario: Supervises 5V CAN transceiver supply and 3.3V microcontroller supply in door module with high EMI exposure. IC Role / Device Role / Timing Role: Uses RESET IN to monitor 3.3V rail while VCC monitors 5V; asserts RESET within 20µs of fault detection. Use Value: Achieves <100ns glitch rejection and guarantees valid reset logic down to VCC = 1V - critical for fail-safe door lock actuation. |
Use Scenario: Provides fail-safe restart capability for LTE modem during cellular handover-induced power fluctuations. IC Role / Device Role / Timing Role: Configured with 2ms reset timeout and 4ms watchdog period to match modem firmware watchdog service window. Use Value: Enables autonomous recovery from communication lockups without host processor intervention - reducing TCU downtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6751KA29/V+T | Identical VCC/RESET IN thresholds and timing, but includes manual-reset input (MR) pin | Required where hardware-initiated reset (e.g., service button) is needed alongside voltage monitoring | Select MAX6751KA29/V+T only if MR functionality is mandatory; otherwise MAX6750KA29/V+T reduces BOM count |
| TLV809E29DBVR | Single-supply (2.93V ±1%) supervisor with 200ms fixed reset timeout; no adjustable watchdog or RESET IN input | Suitable for cost-sensitive, single-rail applications without dual-monitoring or programmable timing needs | Choose TLV809E29DBVR only for basic VCC-only monitoring with fixed delay; lacks dual-voltage and watchdog flexibility of MAX6750KA29/V+T |
Compared with MAX6751KA29/V+T, MAX6750KA29/V+T removes MR functionality to reduce pin count and simplify layout, while retaining identical dual-supply supervision and timing precision; versus TLV809E29DBVR, it adds RESET IN monitoring, capacitor-adjustable timeouts, and watchdog - enabling higher system reliability at modest cost premium.
Availability
MAX6750KA29/V+T is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, and telematics control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6750KA29/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 automotive, industrial, and communications markets with precision power management and sensing solutions.
The MAX6746–MAX6753 family was designed specifically for AEC-Q100-compliant microprocessor supervision in harsh automotive environments, emphasizing dual-rail monitoring, transient immunity, and programmable timing for functional safety-critical systems.
FAQ
What is the exact reset threshold voltage for MAX6750KA29/V+T?
The MAX6750KA29/V+T features a factory-trimmed VCC reset threshold of 2.925V with ±2% tolerance over −40°C to +125°C. This value corresponds to suffix "29" in the ordering code and is verified per Table 2 of the datasheet. The RESET IN threshold remains fixed at 1.235V ±0.8%, enabling precise dual-supply monitoring without external calibration. Both thresholds are guaranteed across automotive temperature range.
Does MAX6750KA29/V+T support windowed watchdog functionality?
No, MAX6750KA29/V+T does not support windowed watchdog functionality. It implements a standard single-timer watchdog (tWD) adjustable via CSWT capacitor, as confirmed in the Selector Guide and Pin Configurations section. Windowed watchdog (min/max timing) is exclusive to MAX6752/MAX6753 variants, which include SET0/SET1 pins and different internal architecture - MAX6750KA29/V+T lacks these pins and features.
What is the function of pin 8 on MAX6750KA29/V+T?
Pin 8 on MAX6750KA29/V+T is a no-connect (NC) terminal - it is not bonded internally and serves no electrical function. This is explicitly documented in the Pin Configurations table for MAX6750/MAX6751, where pin 8 is marked "-" for all functions. PCB layout should leave pin 8 unconnected; routing or soldering to this pin provides no benefit and may risk mechanical stress on the SOT23 package.
Can MAX6750KA29/V+T monitor a 1.8V supply directly?
Yes, MAX6750KA29/V+T can monitor a 1.8V supply using its RESET IN input. By connecting the 1.8V rail to RESET IN through an external resistor divider, the device compares it against its internal 1.235V reference. For example, setting R1 = 220kΩ and R2 = 500kΩ yields VMON_TH = 1.235 × (220k+500k)/500k ≈ 1.78V - matching typical 1.8V rail tolerance. The calculation method is validated in Figure 2 and Applications Information.
Is MAX6750KA29/V+T pin-compatible with other MAX67xx devices in SOT23?
MAX6750KA29/V+T shares the same 8-pin SOT23 footprint with MAX6746–MAX6753, but pin functions differ across variants. Specifically, MAX6750KA29/V+T uses pin 1 for RESET IN and pin 8 as NC, whereas MAX6746 uses pin 1 for MR and MAX6752 uses pin 1 for SET0. Direct replacement requires verifying pin mapping - it is not a drop-in substitute for other family members despite identical package outline.
MAX6750KA29/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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.925V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6750KA29/V+T FAQ
1.How can I place an order for MAX6750KA29/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6750KA29/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 MAX6750KA29/V+T reliable?
The price and inventory of MAX6750KA29/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 MAX6750KA29/V+T is usually 5 days.
3.What payment methods are accepted for MAX6750KA29/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6750KA29/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6750KA29/V+T?
MAX6750KA29/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6750KA29/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 MAX6750KA29/V+T?
For technical support, including MAX6750KA29/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6750KA29/V+T requirements.
6.How does Aetrix verify that MAX6750KA29/V+T is sourced from the original manufacturer or authorized distributors?
All MAX6750KA29/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 MAX6750KA29/V+T meets industry standards.
7.What is the process for return or replacement of MAX6750KA29/V+T?
All MAX6750KA29/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6750KA29/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 MAX6750KA29/V+T part is unused and in its original packaging.
Return procedure for MAX6750KA29/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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