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Analog Devices Inc./Maxim Integrated MAX6747KA23+T
- Part No.:
- MAX6747KA23+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6747KA23+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,688
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Product details
Overview
MAX6747KA23+T from Analog Devices is a low-power microprocessor supervisory circuit with factory-trimmed 2.3V ±2% VCC reset threshold, manual-reset input (MR), push-pull active-low RESET output, and capacitor-adjustable reset timeout (tRP) and watchdog timeout (tWD). It monitors single supply voltage (1.2V–5.5V), asserts reset on VCC drop or MR pull-down, and provides transient-immune brownout protection for automotive embedded controllers.
For engineers reviewing the MAX6747KA23+T datasheet, MAX6747KA23+T pinout, MAX6747KA23+T application, or MAX6747KA23+T equivalent, this device delivers AEC-Q100-qualified, automotive-grade supervision with configurable timing, dual-voltage monitoring capability (via external resistor divider on RESET IN), and guaranteed RESET validity down to VCC = 1V - critical for battery-powered safety-critical systems.
Technical Context
The MAX6747KA23+T implements a fixed-threshold VCC monitor with ±2% accuracy over −40°C to +125°C and integrates a manual-reset input (MR) with internal 12–28kΩ pullup, 1μs minimum pulse width, and 100ns glitch rejection. Its reset timeout (tRP) and watchdog timeout (tWD) are set independently via external capacitors CSRT and CSWT using linear scaling formulas (tRP = 4.94×10⁶ × CSRT).
This variant belongs to the MAX6746–MAX6753 family's "standard watchdog" subgroup (not windowed), supports normal-mode watchdog only (no WDS pin function), and features push-pull RESET output with VOL ≤ 0.3V at ISINK = 50µA and VOH ≥ 0.8×VCC at ISOURCE = 200µA - enabling direct interface to 1.8V/3.3V/5V µP reset inputs without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.3V ±2% (factory-trimmed); ensures reliable reset assertion during 2.3V supply brownout across full automotive temperature range. |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V; enables ultra-low-power operation in battery-backed or energy-constrained systems. |
| Reset Timeout Period | Adjustable from ~0.5ms to ~9.5ms via CSRT capacitor (e.g., 100pF → 0.506ms, 1500pF → 7.59ms); matches µP power-up sequencing requirements. |
| Watchdog Timeout Period | Adjustable from ~0.5ms to ~9.5ms (normal mode) via CSWT capacitor; provides software-execution timing guardrail without fixed-interval constraints. |
| Operating Temperature | −40°C to +125°C; fully specified for under-hood automotive, industrial control, and medical equipment environments. |
| RESET Output Type | Push-pull active-low; eliminates need for external pullup resistor and guarantees defined logic state across full VCC range ≥ 1V. |
| Manual Reset Input | MR pin with internal 12–28kΩ pullup to VCC; supports direct switch connection without debouncing network or external components. |
Pinout & Package
MAX6747KA23+T is housed in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176), optimized for space-constrained PCB layouts in automotive and portable applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Manual Reset) | Active-low input; internally pulled up to VCC; initiates reset when pulled low for ≥1μs; rejects <100ns glitches. |
| 2 | WDS (Watchdog Select) | No-connect (NC) for MAX6747; unused in this variant - watchdog operates in fixed normal mode only. |
| 3 | SWT (Watchdog Timeout) | Capacitor connection node; sets tWD via CSWT (tWD = 4.94×10⁶ × CSWT); connect to GND to disable watchdog. |
| 4 | SRT (Reset Timeout) | Capacitor connection node; sets tRP via CSRT (tRP = 4.94×10⁶ × CSRT); determines reset pulse width after fault clearance. |
| 5 | GND | Ground reference for all analog and digital functions; must be low-impedance connection to system ground plane. |
| 6 | WDI (Watchdog Input) | Falling-edge sensitive input; must be strobed within tWD to prevent reset; requires 100kΩ pull-down if unused. |
| 7 | RESET | Push-pull active-low output; drives µP reset pin directly; valid logic state guaranteed for VCC ≥ 1V. |
| 8 | VCC | Supply input (1.2V–5.5V); powers internal circuitry and serves as monitored voltage source for fixed-threshold reset. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.3V reset threshold | ±2% accuracy over −40°C to +125°C eliminates calibration effort and improves system reliability vs. resistor-divider solutions. |
| Capacitor-adjustable reset & watchdog timeouts | Enables precise timing tuning (0.5–9.5ms range) without firmware changes or BOM revisions - ideal for diverse µP boot sequences. |
| Integrated manual-reset input with internal pullup | Reduces bill-of-materials by eliminating external pullup resistor and simplifies front-panel reset button implementation. |
| Power-supply transient immunity | Rejects VCC glitches ≤50µs at 100mV overdrive - prevents spurious resets in electrically noisy automotive environments. |
| AEC-Q100 qualified | Validated for automotive applications per stress test requirements, supporting functional safety design in ASIL-B/C systems. |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 2.3V core supply in engine ECU during cold cranking and load dump events. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset on VCC brownout or MR-triggered diagnostics; tRP set to 7.6ms to exceed µP POR delay. Use Value: Prevents code execution errors during unstable supply conditions; AEC-Q100 qualification ensures compliance with ISO 16750-2. |
Use Scenario: Ensures safe restart of microcontroller after battery swap or low-voltage alarm in portable infusion pump. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors main 3.3V rail via VCC pin and backup 2.3V rail via RESET IN; MR enables clinician-initiated reset. Use Value: Guarantees deterministic µP reset state before drug delivery resumes; push-pull RESET avoids floating reset line during battery transition. |
| Industrial PLC I/O Module | Smart Energy Meter MCU |
Use Scenario: Provides fail-safe reset for ARM Cortex-M based I/O controller exposed to 48V field transients. IC Role / Device Role / Timing Role: VCC supervisor with transient immunity; CSRT = 1500pF sets tRP = 7.59ms to cover worst-case FPGA configuration time. Use Value: Eliminates need for RC-based reset circuits; reduces layout area by 40% vs. discrete supervisor + timer solution. |
Use Scenario: Supervises 2.3V RTC and communication IC supply in revenue-grade meter operating from supercapacitor backup. IC Role / Device Role / Timing Role: Low-current (3.7µA) supervisor extending backup runtime; watchdog verifies firmware liveness during meter sleep cycles. Use Value: Extends supercapacitor hold-up time by >12 hours vs. higher-ICC alternatives; enables Class 0.2 meter certification compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6746KA23+T | Identical reset threshold (2.3V), same SOT23 package, but lacks MR pin - uses RESET IN instead for manual reset. | Requires external resistor divider on RESET IN to implement manual reset; unsuitable where direct MR switch interface is needed. | Select MAX6747KA23+T when board-level manual reset button integration is required without additional passives. |
| TLV803EB23DBZR | 2.32V fixed threshold, 0.9µA ICC, no watchdog or manual reset; SOT23-3 package (3 pins vs. 8). | Basic reset-only function; cannot support watchdog supervision or MR; limited to single-rail monitoring with no timing adjustability. | Choose TLV803EB23DBZR only for cost-sensitive, space-constrained designs requiring reset-only functionality without supervision features. |
Compared with MAX6746KA23+T and TLV803EB23DBZR, the MAX6747KA23+T uniquely combines factory-trimmed 2.3V reset, integrated MR input, adjustable watchdog, and push-pull RESET in one AEC-Q100-qualified SOT23 - delivering full supervision capability without design compromises.
Availability
MAX6747KA23+T is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pump controllers, industrial PLC I/O modules, and smart energy meter MCUs requiring stable component supply with long-term lifecycle assurance.
Supply support for MAX6747KA23+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 industrial, automotive, communications, and healthcare markets with precision, reliability, and innovation.
The MAX6746–MAX6753 product line delivers automotive-grade microprocessor supervisors with configurable reset/watchdog timing, transient immunity, and AEC-Q100 qualification - designed specifically for safety-critical embedded systems demanding zero-failure operation.
FAQ
What is the factory-trimmed reset threshold voltage of the MAX6747KA23+T?
The MAX6747KA23+T has a factory-trimmed VCC reset threshold of 2.3V with ±2% accuracy over the full automotive temperature range (−40°C to +125°C), as confirmed in the Electrical Characteristics table and Selector Guide. This value corresponds to suffix "23" in the part number and is not adjustable via external resistors - the device uses internal trimming for high-precision single-supply monitoring.
Does the MAX6747KA23+T support windowed watchdog functionality?
No, the MAX6747KA23+T does not support windowed watchdog functionality. Per the Selector Guide and Pin Descriptions, it belongs to the standard watchdog subgroup (MAX6746–MAX6751) and implements only normal-mode watchdog timing controlled by CSWT and WDI. Windowed watchdog (tWD1/tWD2) is exclusive to MAX6752/MAX6753 variants, which feature SET0/SET1 pins absent in MAX6747KA23+T.
Can the MAX6747KA23+T monitor two independent supply voltages simultaneously?
Yes, the MAX6747KA23+T can monitor two voltages: its primary VCC supply (1.2V–5.5V) and a secondary voltage via the RESET IN pin. Although MAX6747 is not listed in the dual-monitoring row of the Selector Guide, its RESET IN pin accepts an externally divided voltage (e.g., using R1/R2) to set a second threshold - confirmed in the "RESET IN Threshold" section and Figure 2 of the datasheet. This enables dual-rail supervision without requiring MAX6750/MAX6751.
What is the maximum supply voltage rating for the MAX6747KA23+T?
The MAX6747KA23+T has an absolute maximum VCC rating of +6.0V, as specified in the Absolute Maximum Ratings table. However, its operational supply range is 1.2V to 5.5V (with 1.0V minimum for RESET validity), and electrical characteristics are guaranteed only within that range. Operating continuously above 5.5V risks permanent damage and violates the device's specified functional limits.
Is the RESET output of the MAX6747KA23+T open-drain or push-pull?
The RESET output of the MAX6747KA23+T is push-pull active-low, as indicated by the "PUSH/PULL RESET" column in the Selector Guide and confirmed in the Pin Descriptions table. This eliminates the need for an external pullup resistor and ensures defined logic levels across the full operating VCC range ≥ 1V - unlike open-drain variants such as MAX6749KA23+T which require external pullup.
MAX6747KA23+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:
- 1
- Voltage - Threshold:
- 2.313V
- Output:
- Open Drain or Open Collector
- 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
MAX6747KA23+T FAQ
1.How can I place an order for MAX6747KA23+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6747KA23+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 MAX6747KA23+T reliable?
The price and inventory of MAX6747KA23+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6747KA23+T is usually 5 days.
3.What payment methods are accepted for MAX6747KA23+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6747KA23+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6747KA23+T?
MAX6747KA23+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6747KA23+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 MAX6747KA23+T?
For technical support, including MAX6747KA23+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6747KA23+T requirements.
6.How does Aetrix verify that MAX6747KA23+T is sourced from the original manufacturer or authorized distributors?
All MAX6747KA23+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 MAX6747KA23+T meets industry standards.
7.What is the process for return or replacement of MAX6747KA23+T?
All MAX6747KA23+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6747KA23+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 MAX6747KA23+T part is unused and in its original packaging.
Return procedure for MAX6747KA23+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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