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Analog Devices Inc./Maxim Integrated MAX6750KA30+
- Part No.:
- MAX6750KA30+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6750KA30+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,103
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Product details
Overview
MAX6750KA30+ from Analog Devices is a low-power microprocessor supervisory circuit with dual-voltage monitoring (VCC and external RESET IN), factory-trimmed 3.0V ±2% VCC reset threshold, and capacitor-adjustable reset/watchdog timeout periods. It features push-pull active-low RESET output, manual-reset input (MR), and standard watchdog timer with WDS-selectable extended mode (128×). Used in automotive engine control units to ensure reliable μP restart during brownout or software hang.
For engineers reviewing the MAX6750KA30+ datasheet, MAX6750KA30+ pinout, MAX6750KA30+ application, or MAX6750KA30+ equivalent, this page delivers verified specifications, automotive-grade thermal performance (-40°C to +125°C), SOT23-8 package layout, and real-world timing behavior for reset timeout (5.7–9.5 ms with 1500 pF), watchdog timeout (5.7–9.5 ms normal / 729–1214 ms extended), and MR-to-RESET delay (200 ns).
Technical Context
The MAX6750KA30+ integrates two independent reset comparators: one monitors VCC against a factory-set 3.0V threshold (±2%, -40°C to +125°C), the other monitors an externally adjustable voltage via RESET IN pin with 1.235V ±0.019V threshold. Reset assertion is triggered by either comparator falling below its threshold or MR pull-down, with guaranteed RESET validity down to VCC = 1.0V.
It implements a standard watchdog timer (not windowed) with capacitor-programmable timeout (tWD = 4.94 × 10⁶ × CSWT), selectable between normal and 128× extended mode via WDS pin. The watchdog clears on WDI falling edge, RESET assertion, or WDS transition - and restarts counting only after RESET deassertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VCC) | 3.000 V ±2% (factory-trimmed; ensures precise brownout detection at nominal 3.0V rail) |
| Reset Timeout Period | 5.69–9.49 ms (with 1500 pF on SRT; sets minimum processor hold time after power recovery) |
| Watchdog Timeout (Normal) | 5.69–9.49 ms (with 1500 pF on SWT; defines max software service interval before reset) |
| Watchdog Timeout (Extended) | 729–1214 ms (128× multiplier activated by WDS = VCC; supports long-loop firmware) |
| Supply Current | 3.7–10 µA (at VCC = 1.2–5.5 V; enables multi-year battery life in portable systems) |
| Operating Temperature | -40°C to +125°C (AEC-Q100 qualified; validated for under-hood automotive use) |
| RESET Output Type | Push-pull active-low (drives μP reset pin directly without external pull-up; VOL ≤ 0.3 V @ 50 µA) |
Pinout & Package
MAX6750KA30+ is housed in an 8-pin SOT23 package (Outline 21-0078, Land Pattern 90-0176), optimized for space-constrained automotive and portable applications. Thermal resistance is 196°C/W (Junction-to-Ambient, 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Manual-Reset Input | Internally pulled up to VCC; assert reset by pulling low ≥1 µs; rejects 100 ns glitches |
| 2 - WDS | Watchdog Select Input | Ground = normal watchdog mode; VCC = 128× extended timeout; state change clears timer |
| 3 - SWT | Watchdog Timeout Input | Capacitor to GND sets tWD (normal/extended); connect to GND to disable watchdog |
| 4 - SRT | Reset Timeout Input | Capacitor to GND sets tRP (reset pulse width); formula: tRP = 4.94 × 10⁶ × CSRT |
| 5 - GND | Ground Reference | Primary return path for all internal circuits and external timing capacitors |
| 6 - WDI | Watchdog Input | Falling edge resets watchdog timer; must not float; 300 ns min pulse width accepted |
| 7 - RESET | Active-Low Reset Output | Push-pull driver; asserts low during fault; holds for full tRP after recovery |
| 8 - VCC | Supply Voltage Input | 1.0–5.5 V operation; powers device and feeds VCC monitor comparator |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneously monitors fixed 3.0V VCC rail and user-defined voltage via RESET IN resistor divider |
| Transient-immune reset logic | Guaranteed immunity to ≤50 µs VCC transients dropping 100 mV below threshold |
| Capacitor-programmable timing | Independent SRT and SWT pins enable precise, board-level tuning of reset and watchdog delays |
| AEC-Q100 qualified | Validated for automotive applications across full -40°C to +125°C junction temperature range |
| Low-leakage design | RESET IN leakage ±1 nA enables high-value resistor dividers (e.g., 500 kΩ) without accuracy loss |
Applications
| Engine Control Unit (ECU) | Infotainment Head Unit |
|---|---|
Use Scenario: Monitors 3.0V microcontroller supply and 5.0V CAN transceiver rail during cold cranking and load dump events. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting RESET when either rail drops below spec, with 729 ms extended watchdog guarding against firmware lockup. Use Value: Prevents ECU from executing corrupted code during voltage sag; eliminates need for discrete reset ICs per rail. | Use Scenario: Ensures clean boot and runtime watchdog coverage for ARM-based infotainment SoC powered by multiple DC/DC rails. IC Role / Device Role / Timing Role: Uses RESET IN pin to monitor secondary 1.8V core rail while VCC tracks main 3.3V I/O rail; MR enables hard reset via front-panel button. Use Value: Single-chip solution replaces two supervisors; push-pull RESET drives SoC reset without pull-up resistor, saving BOM cost and board area. |
| ADAS Camera Module | Industrial PLC Controller |
Use Scenario: Supervises 2.8V image sensor supply and 3.0V ISP processor rail in compact camera housing exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Leverages -40°C to +125°C operation and ±2% VCC threshold to maintain timing integrity across thermal cycling. Use Value: Guarantees deterministic reset behavior over full automotive temperature range; eliminates field failures due to marginal brownout response. | Use Scenario: Provides fail-safe reset for Cortex-M7 controller in DIN-rail mounted PLC, where long watchdog intervals are required for complex motion control loops. IC Role / Device Role / Timing Role: Configured with 1500 pF on SWT and WDS = VCC to deliver 1.2 s extended watchdog timeout, matching firmware cycle time. Use Value: Avoids spurious resets during legitimate long-duration tasks; reduces maintenance calls caused by unnecessary reboots. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6751KA30+ | Same VCC reset threshold (3.0V), but open-drain RESET output and no MR pin; uses SET0/SET1 instead of WDS | Suitable where level-shifting or wired-OR reset bus is needed; incompatible with direct push-pull drive requirements | Select MAX6751KA30+ only if open-drain interface or absence of manual reset is acceptable |
| TPS3808G30DBVR | 3.0V fixed threshold, 200 ms min reset timeout (non-adjustable), 3.5 µA typical ICC, SOT23-6 package | Lacks dual-voltage monitoring, adjustable timeouts, and watchdog - suited for basic single-rail reset only | Choose TPS3808G30DBVR for cost-sensitive, low-complexity applications without watchdog or RESET IN needs |
Compared with MAX6751KA30+, MAX6750KA30+ provides push-pull RESET and MR for simplified hardware integration; versus TPS3808G30DBVR, it offers field-tunable timing, dual-supply monitoring, and robust watchdog - critical for safety-critical automotive and industrial control.
Availability
MAX6750KA30+ is available at Aetrix Electronics and suitable for automotive engine control units, infotainment head units, and ADAS camera modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6750KA30+ 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 precision instrumentation, industrial automation, and automotive markets.
The MAX6746–MAX6753 family was designed specifically for automotive and industrial microprocessor supervision, emphasizing AEC-Q100 qualification, transient immunity, and flexible timing configuration via external capacitors.
FAQ
What is the exact reset threshold voltage for MAX6750KA30+?
The MAX6750KA30+ has a factory-trimmed VCC reset threshold of 3.000 V with ±2% tolerance over -40°C to +125°C. This value is confirmed in Table 2 (suffix "30") and Electrical Characteristics section of the datasheet. The actual threshold falls between 2.940 V and 3.060 V at temperature extremes. MAX6750KA30+ does not use adjustable VCC threshold - only the RESET IN pin supports external resistor-divider configuration.
Does MAX6750KA30+ support dual-voltage monitoring, and how is it implemented?
Yes, MAX6750KA30+ supports dual-voltage monitoring: it monitors VCC against its fixed 3.0V threshold and simultaneously monitors an external voltage via the RESET IN pin using a 1.235V ±0.019V internal reference. To supervise a second rail (e.g., 5.0V), connect a resistor divider (R1/R2) between that rail and RESET IN, sized so the midpoint equals 1.235V at the desired trip point. This capability is explicitly listed in the Selector Guide for MAX6750/MAX6751.
What watchdog modes does MAX6750KA30+ support, and how is extended mode enabled?
MAX6750KA30+ supports normal and extended watchdog modes only - not windowed watchdog (which is exclusive to MAX6752/MAX6753). Extended mode (128× timeout multiplier) is enabled by connecting the WDS pin to VCC. When WDS = GND, the device operates in normal mode. A state change on WDS clears the watchdog timer, and the mode is latched until next reset or WDS transition.
What is the minimum recommended capacitor value for SRT and SWT on MAX6750KA30+?
The datasheet specifies valid operation with CSRT or CSWT = 100 pF, yielding ~0.506 ms reset or watchdog timeout. Ceramic capacitors with leakage <10 nA are required. For stable timing across temperature, X7R or C0G dielectrics are recommended. Values below 100 pF are not characterized and may cause timing inaccuracy or increased sensitivity to PCB stray capacitance.
Is MAX6750KA30+ pin-compatible with other devices in the MAX6746–MAX6753 family?
MAX6750KA30+ shares the identical 8-pin SOT23 pinout with MAX6746–MAX6751 (including MR, WDS, SWT, SRT, WDI, RESET, GND, VCC), as shown in the Pin Configurations diagram. However, pin functionality differs for MAX6752/MAX6753 (which replace WDS with SET0/SET1). Therefore, MAX6750KA30+ is pin-compatible with MAX6746–MAX6751 but not with MAX6752/MAX6753.
MAX6750KA30+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 3V, Adj
- Output:
- Push-Pull, Totem Pole
- 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
MAX6750KA30+ FAQ
1.How can I place an order for MAX6750KA30+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6750KA30+ 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 MAX6750KA30+ reliable?
The price and inventory of MAX6750KA30+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6750KA30+ is usually 5 days.
3.What payment methods are accepted for MAX6750KA30+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6750KA30+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6750KA30+?
MAX6750KA30+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6750KA30+ 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 MAX6750KA30+?
For technical support, including MAX6750KA30+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6750KA30+ requirements.
6.How does Aetrix verify that MAX6750KA30+ is sourced from the original manufacturer or authorized distributors?
All MAX6750KA30+ 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 MAX6750KA30+ meets industry standards.
7.What is the process for return or replacement of MAX6750KA30+?
All MAX6750KA30+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6750KA30+, 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 MAX6750KA30+ part is unused and in its original packaging.
Return procedure for MAX6750KA30+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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