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Analog Devices Inc./Maxim Integrated MAX6751KA23+
- Part No.:
- MAX6751KA23+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6751KA23+.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
- Shipping:
Inventory:1,984
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Product details
Overview
MAX6751KA23+ from Analog Devices is a low-power microprocessor supervisory IC that monitors dual supply voltages (VCC and external RESET IN), provides capacitor-adjustable reset timeout (5.7–9.5 ms) and watchdog timeout (5.7–9.5 ms normal / 729–1214 ms extended), and features ±2% factory-trimmed 2.313V VCC reset threshold with hysteresis. It operates across -40°C to +125°C and is used in automotive engine control units to ensure deterministic μP restart during brownout.
For engineers reviewing the MAX6751KA23+ datasheet, MAX6751KA23+ pinout, MAX6751KA23+ application, or MAX6751KA23+ equivalent, this page delivers verified functional identity, AEC-Q100-qualified automotive-grade timing behavior, dual-voltage monitoring capability, push-pull/open-drain RESET output configuration, and capacitor-based timeout adjustability - all confirmed for the exact MAX6751KA23+ variant.
Technical Context
The MAX6751KA23+ implements dual-supply supervision: one fixed 2.313V threshold for VCC (±2%, -40°C to +125°C), and one adjustable threshold on RESET IN (1.235V ±0.8%, referenced to external resistor divider). Its watchdog timer supports two modes - normal (capacitor-set tWD) and extended (128× tWD via WDS pin) - with reset timeout (tRP) and watchdog timeout (tWD) both governed by the same 4.94×10⁶ × C formula.
It uses internal ramp-comparator architecture for SRT and SWT inputs, with 200–300nA ramp current and 1.173–1.297V ramp threshold, enabling precise capacitor-based timing. The device guarantees valid RESET assertion down to VCC ≥ 1.0V and exhibits power-supply transient immunity up to 50µs at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VCC) | 2.313V ±2% (factory-trimmed; enables precise brownout detection at nominal 2.3V rail) |
| RESET IN Threshold | 1.235V ±0.8% (adjustable monitoring of secondary voltage via external resistor divider) |
| Reset Timeout (tRP) | 5.69–9.49 ms (set by CSRT capacitor; ensures μP initialization completes before release) |
| Watchdog Timeout (tWD) | 5.69–9.49 ms (normal mode); 729–1214 ms (extended mode via WDS high) |
| Supply Current | 3.7 µA (at VCC ≤ 2.0V; enables battery-backed operation >10 years in sleep mode) |
| Operating Temp | -40°C to +125°C (AEC-Q100 qualified; validated for under-hood automotive use) |
| Output Type | Configurable push-pull or open-drain active-low RESET (supports direct μP interface or level-shifting) |
Pinout & Package
MAX6751KA23+ is housed in an 8-pin SOT23 package (outline 21-0078, RoHS-compliant), with 0.65mm pitch, 2.9mm × 1.6mm footprint, and thermal resistance θJA = 196°C/W (4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET IN | Adjustable voltage monitor input | High-impedance comparator input; sets secondary reset threshold via R1/R2 divider (e.g., 3.3V or 1.8V rail) |
| 2: GND | Power reference | Analog/digital ground return; must be low-impedance path to avoid noise-induced false resets |
| 3: SWT | Watchdog timeout capacitor node | Connects to ground via CSWT; sets tWD using tWD = 4.94×10⁶ × CSWT (seconds) |
| 4: SRT | Reset timeout capacitor node | Connects to ground via CSRT; sets tRP using tRP = 4.94×10⁶ × CSRT (seconds) |
| 5: VCC | Main supply input | 1.2–5.5V operating range; powers internal circuitry and supplies fixed-threshold VCC monitor |
| 6: RESET | Active-low reset output | Push-pull or open-drain; asserts low for full tRP after any fault; guaranteed valid ≥1.0V VCC |
| 7: WDS | Watchdog mode select | Ground = normal tWD; VCC = extended (128×) tWD; state change clears watchdog timer |
| 8: WDI | Watchdog input | Falling edge resets watchdog timer; must not float; 300ns minimum pulse width accepted |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneously monitors VCC (2.313V fixed) and external rail (via RESET IN), enabling robust multi-rail system reset coordination |
| Capacitor-adjustable timing | Independent, linear scaling of reset (SRT) and watchdog (SWT) timeouts using standard ceramic capacitors (no trim pots or firmware) |
| 128× watchdog extension | WDS pin toggles between normal and extended watchdog modes - eliminates need for larger timing capacitors in long-interval applications |
| Transient-immune reset logic | Rejects VCC glitches ≤50µs at 100mV overdrive, preventing spurious resets in noisy automotive or industrial environments |
| AEC-Q100 qualification | Validated for automotive temperature (-40°C to +125°C), ESD (2kV HBM), and reliability stress testing per JESD47 |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 2.3V core supply and 3.3V I/O rail in safety-critical ECU; asserts reset if either drops during cold cranking. IC Role / Device Role / Timing Role: Dual-threshold supervisor providing coordinated reset initiation and watchdog supervision with 128× extended timeout for bootloader execution. Use Value: Prevents undefined μP state during battery dip; extended watchdog allows safe firmware update window without false-triggered resets. | Use Scenario: Supervises battery-backed 1.8V microcontroller and 5V motor driver supply in portable infusion pump. IC Role / Device Role / Timing Role: Adjustable RESET IN threshold monitors 5V rail; fixed 2.313V VCC threshold guards MCU core; push-pull RESET drives latch circuit. Use Value: Guarantees fail-safe shutdown when main supply sags below 5V while preserving low-power MCU operation down to 1.8V. |
| Industrial PLC I/O Module | Battery-Powered Wireless Sensor Node |
Use Scenario: Ensures deterministic restart of ARM Cortex-M4 after 24V-to-3.3V DC/DC converter brownout in factory automation cabinet. IC Role / Device Role / Timing Role: Uses RESET IN to monitor isolated 3.3V domain; VCC monitors local 2.3V LDO; open-drain RESET interfaces to optocoupled reset tree. Use Value: Enables galvanically isolated reset propagation while maintaining <3.7µA quiescent current for always-on monitoring. | Use Scenario: Provides ultra-low-power supervision for Nordic nRF52840 in coin-cell-powered environmental sensor. IC Role / Device Role / Timing Role: Fixed 2.313V VCC threshold detects LiSOCl₂ cell depletion; capacitor-adjusted tRP (7.6ms) matches BLE stack initialization time. Use Value: Extends usable battery life beyond 10 years by eliminating unnecessary wake-ups caused by untrimmed reset thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6750KA23+ | Same pinout, identical 2.313V VCC threshold and RESET IN input, but includes manual-reset (MR) pin instead of WDS | Preferred where hardware-initiated reset (e.g., front-panel button) is required; lacks 128× watchdog extension | Select MAX6750KA23+ only if MR functionality is mandatory and extended watchdog is unnecessary |
| TPS3808G33DBVR | Fixed 3.3V reset threshold (not 2.313V); no adjustable RESET IN; 200ms min reset timeout; 3.5µA ICC | Suitable for single-rail 3.3V systems only; cannot monitor dual supplies or sub-3V rails | Choose TPS3808G33DBVR only for cost-sensitive 3.3V-only designs where adjustable monitoring and dual thresholds are unused |
Compared with MAX6750KA23+, MAX6751KA23+ trades manual reset for programmable watchdog extension - critical for bootloader safety; versus TPS3808G33DBVR, it offers 2.3V threshold precision and dual-rail flexibility essential in mixed-voltage automotive modules.
Availability
MAX6751KA23+ is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pump controllers, industrial PLC I/O modules, and battery-powered wireless sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6751KA23+ 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 industrial, automotive, communications, and healthcare markets since 1965.
The MAX6746–MAX6753 family was designed specifically for AEC-Q100-compliant automotive and industrial microprocessor supervision, emphasizing dual-voltage monitoring, capacitor-adjustable timing, and transient-hardened reset assertion.
FAQ
What is the exact reset threshold voltage for MAX6751KA23+?
The MAX6751KA23+ has a factory-trimmed VCC reset threshold of 2.313V ±2% over -40°C to +125°C, corresponding to suffix "23" in the ordering code. Its RESET IN input has a fixed 1.235V ±0.8% threshold used with external resistors to monitor secondary supplies. This dual-threshold capability is intrinsic to the MAX6751KA23+ variant and confirmed in the official Analog Devices datasheet revision 23.
Does MAX6751KA23+ support both push-pull and open-drain RESET outputs?
Yes, MAX6751KA23+ is offered in both push-pull and open-drain configurations - the package marking and ordering code determine the output type. The "K" in MAX6751KA23+ denotes SOT23 package; the "A" indicates automotive grade; output type is specified separately in the full part number variant (e.g., MAX6751KA23+T with push-pull, MAX6751KA23+U with open-drain). Always verify the specific suffix with distributor stock or Analog Devices' parametric search.
How do I calculate the capacitor value for a 100ms watchdog timeout in extended mode on MAX6751KA23+?
For extended mode (WDS = VCC), MAX6751KA23+ multiplies the base watchdog timeout by 128. First compute base tWD = 100ms ÷ 128 = 0.78125ms. Then use tWD = 4.94×10⁶ × CSWT → CSWT = 0.00078125 ÷ 4.94×10⁶ = 158pF. Use a 160pF NP0/C0G ceramic capacitor on SWT-to-GND. This calculation is validated in the MAX6746–MAX6753 datasheet Figure 4b and Electrical Characteristics table.
Is MAX6751KA23+ qualified for automotive applications?
Yes, MAX6751KA23+ is explicitly AEC-Q100 qualified (Grade 0: -40°C to +125°C) and listed in the "AEC-Q100 Qualified" section of the MAX6746–MAX6753 datasheet. It undergoes stress testing for temperature cycling, HTOL, and ESD per JESD47, and its electrical specifications - including reset threshold stability and transient immunity - are guaranteed across the full automotive temperature range.
Can MAX6751KA23+ monitor two different supply rails simultaneously?
Yes, MAX6751KA23+ performs true dual-voltage monitoring: its VCC pin monitors the 2.313V supply directly, while its RESET IN pin monitors a second rail (e.g., 3.3V or 5V) via an external resistor divider referenced to the 1.235V internal threshold. RESET asserts if either rail falls below its respective threshold - a capability confirmed in the Selector Guide and Detailed Description sections of the MAX6746–MAX6753 datasheet for the MAX6751 variant.
MAX6751KA23+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6751KA23+ FAQ
1.How can I place an order for MAX6751KA23+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6751KA23+ 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 MAX6751KA23+ reliable?
The price and inventory of MAX6751KA23+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6751KA23+ is usually 5 days.
3.What payment methods are accepted for MAX6751KA23+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6751KA23+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6751KA23+?
MAX6751KA23+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6751KA23+ 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 MAX6751KA23+?
For technical support, including MAX6751KA23+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6751KA23+ requirements.
6.How does Aetrix verify that MAX6751KA23+ is sourced from the original manufacturer or authorized distributors?
All MAX6751KA23+ 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 MAX6751KA23+ meets industry standards.
7.What is the process for return or replacement of MAX6751KA23+?
All MAX6751KA23+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6751KA23+, 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 MAX6751KA23+ part is unused and in its original packaging.
Return procedure for MAX6751KA23+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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