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Analog Devices Inc./Maxim Integrated MAX6746KA23+T
- Part No.:
- MAX6746KA23+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6746KA23+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,205
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Product details
Overview
The MAX6746KA23+T from Analog Devices is a low-power microprocessor supervisory circuit with factory-trimmed 2.3V ±2% VCC reset threshold, capacitor-adjustable reset timeout (5.7–9.5ms), and standard watchdog timer. It monitors single supply voltage (1.2–5.5V), asserts active-low push-pull RESET on VCC drop or manual reset, and operates across -40°C to +125°C for automotive-grade reliability.
For engineers reviewing the MAX6746KA23+T datasheet, MAX6746KA23+T pinout, MAX6746KA23+T application, or MAX6746KA23+T equivalent, this device supports critical μP monitoring in battery-powered controllers, medical equipment, and intelligent instruments where precise brownout detection, transient immunity, and configurable timeout delays are required.
Technical Context
The MAX6746KA23+T implements a fixed-threshold VCC monitor with ±2% accuracy over -40°C to +125°C and guarantees valid RESET output down to VCC = 1V. Its reset timeout is set by an external capacitor on SRT (tRP = 4.94 × 10⁶ × CSRT), while watchdog timeout is set via CSWT (tWD = 4.94 × 10⁶ × CSWT) and extended 128× via WDS pin.
This variant belongs to the MAX6746–MAX6751 subgroup: it features manual-reset input (MR), no window watchdog, no SET0/SET1 pins, and push-pull RESET output. It does not support dual-voltage monitoring or adjustable RESET IN threshold - only fixed VCC supervision at 2.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.3V ±2% (factory-trimmed, stable over -40°C to +125°C) |
| Supply Voltage Range | 1.2V to 5.5V - supports 1.8V, 2.5V, 3.3V, and 5V systems |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V - enables ultra-low-power battery operation |
| Reset Timeout Period | 5.69–9.49ms (with CSRT = 1500pF) - configurable via external capacitor |
| Watchdog Timeout | 5.69–9.49ms normal mode; 729–1214ms extended mode (128×) - selectable via WDS pin |
| Operating Temperature | -40°C to +125°C - AEC-Q100 qualified for automotive applications |
| RESET Output Type | Active-low push-pull - drives high without external pull-up; valid down to VCC = 1V |
Pinout & Package
MAX6746KA23+T is housed in an 8-pin SOT23 package (package code K8+5A), with 0.65mm pitch, 2.9mm × 1.6mm footprint, and thermal resistance θJA = 196°C/W (4-layer board). Pin functions are validated per Maxim/Analog Devices datasheet Rev 23.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Manual Reset Input) | Active-low input; internally pulled up to VCC; 1µs minimum pulse width; rejects 100ns glitches |
| 2 | WDS (Watchdog Select) | Selects normal (GND) or extended (VCC) watchdog timeout; state change clears watchdog timer |
| 3 | SWT (Watchdog Timeout Input) | Capacitor-connected node setting tWD; connect to GND to disable watchdog |
| 4 | SRT (Reset Timeout Input) | Capacitor-connected node setting tRP; determines reset assertion duration after fault recovery |
| 5 | GND | Ground reference for all internal comparators and output stage |
| 6 | WDI (Watchdog Input) | Falling-edge-triggered watchdog feed; 300ns minimum pulse width; must not float (100kΩ to GND recommended) |
| 7 | RESET | Active-low push-pull output; sinks 50µA @ 0.3V max VOL; sources 200µA @ 0.8×VCC min VOH |
| 8 | VCC | Power supply input and monitored voltage rail; absolute max = +6.0V; guaranteed operation down to 1.2V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.3V reset threshold | ±2% accuracy over full automotive temperature range eliminates calibration overhead |
| Capacitor-adjustable reset timeout | Enables precise matching to µP power-up timing across diverse clock speeds and firmware boot sequences |
| 128× extendable watchdog timeout | Supports long software execution cycles without requiring large, unreliable timing capacitors |
| Push-pull RESET output | Eliminates need for external pull-up resistor; reduces BOM count and layout area in space-constrained designs |
| 3.7µA supply current at 2.0V | Extends battery life in portable medical and industrial controllers operating from coin cells or Li-ion |
| Power-supply transient immunity | Rejects 100mV transients lasting ≤50µs - prevents spurious resets in noisy automotive or motor-control environments |
Applications
| Automotive Engine Control Unit (ECU) | Portable Medical Infusion Pump |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply during cold cranking and load-dump events. IC Role / Device Role / Timing Role: Supervises VCC rail and provides 7.6ms reset pulse to ensure deterministic MCU boot after voltage recovery. Use Value: Prevents erratic ECU behavior during 8–12V battery dips by asserting RESET until stable 3.3V is confirmed and held for full timeout period. |
Use Scenario: Ensures safe restart of ARM-based controller after battery insertion or low-voltage brownout. IC Role / Device Role / Timing Role: Provides 2.3V VCC supervision and 7.6ms reset hold time synchronized to pump motor initialization sequence. Use Value: Guarantees clinical-grade reliability by eliminating race conditions between power stabilization and firmware execution. |
| Industrial PLC I/O Module | Smart Energy Meter |
Use Scenario: Detects undervoltage on isolated 5V logic rail powering communication interface ICs. IC Role / Device Role / Timing Role: Asserts push-pull RESET to halt Modbus RTU transmission during brownout and reinitialize UART peripherals. Use Value: Maintains data integrity by preventing corrupted frame transmission during unstable supply conditions. |
Use Scenario: Supervises 1.8V RTC and metrology ASIC supply in battery-backed meter during grid outage. IC Role / Device Role / Timing Role: Triggers watchdog reset if firmware fails to service WDI within 7.6ms (normal mode), ensuring accurate timekeeping. Use Value: Meets IEC 62053-21 tamper-resistance requirements via hardware-enforced fail-safe restart. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6747KA23+T | Same 2.3V threshold and timing, but open-drain RESET output instead of push-pull | Requires external pull-up; suitable when level-shifting to higher-voltage logic or shared reset bus | Select MAX6747KA23+T only if system requires open-drain drive or multi-drop reset arbitration. |
| TPS3808G23DBVR | 2.3V ±0.5% threshold, 3.5µA ICC, fixed 200ms watchdog, no manual reset pin | Lacks MR input and capacitor-adjustable timeouts; optimized for simpler, cost-sensitive applications | Choose TPS3808G23DBVR when design prioritizes tighter threshold tolerance and lower quiescent current over configurability. |
Compared with MAX6746KA23+T, MAX6747KA23+T trades push-pull drive for open-drain flexibility, while TPS3808G23DBVR sacrifices adjustability for higher precision and lower power - making MAX6746KA23+T optimal for designs needing manual reset, programmable timing, and direct-drive capability in harsh environments.
Availability
MAX6746KA23+T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical devices, industrial PLC modules, and smart energy meters requiring stable component supply under extended temperature and long lifecycle commitments.
Supply support for MAX6746KA23+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 technologies, serving industrial, automotive, communications, and healthcare markets.
The MAX6746–MAX6753 family was designed specifically for robust, low-power microprocessor supervision in automotive and industrial applications demanding AEC-Q100 qualification, wide temperature operation, and field-proven transient immunity.
FAQ
What is the exact reset threshold voltage of the MAX6746KA23+T?
The MAX6746KA23+T has a factory-trimmed VCC reset threshold of 2.3V with ±2% tolerance over -40°C to +125°C, as specified in Table 2 (suffix "23") of the datasheet. This value is laser-trimmed during production and does not require external resistor networks - unlike adjustable variants such as MAX6748.
Does the MAX6746KA23+T support dual-voltage monitoring?
No, the MAX6746KA23+T monitors only the VCC supply voltage at its fixed 2.3V threshold. Dual-voltage monitoring (e.g., VCC and an external rail via RESET IN) is supported only by MAX6750/MAX6751 variants. The MAX6746KA23+T lacks RESET IN, SET0, and SET1 pins and is not configured for adjustable threshold inputs.
How do I configure the watchdog timeout on the MAX6746KA23+T?
Connect a capacitor (CSWT) between pin 3 (SWT) and GND to set the base watchdog timeout (tWD = 4.94 × 10⁶ × CSWT). Then use pin 2 (WDS): tie to GND for normal mode (e.g., 7.6ms with 1500pF), or to VCC for extended mode (975ms with same capacitor). Leaving SWT floating or unconnected disables the watchdog.
Is the MAX6746KA23+T pin-compatible with other MAX6746 variants?
Yes - all MAX6746 variants (e.g., MAX6746KA29+T, MAX6746KA32+T) share identical 8-pin SOT23 pinout, electrical interface, and functional pin assignments. Only the reset threshold voltage differs between suffixes; timing, MR, WDS, SWT, SRT, WDI, RESET, and VCC/GND roles remain fully consistent across the MAX6746 series.
What is the minimum VCC required for guaranteed RESET functionality in the MAX6746KA23+T?
The MAX6746KA23+T guarantees valid RESET output (logic-high VOH ≥ 0.8×VCC and logic-low VOL ≤ 0.3V) for VCC ≥ 1.8V. However, RESET remains asserted and functional down to VCC = 1.0V - critical for detecting brownout conditions before complete power collapse in automotive and battery-powered systems.
MAX6746KA23+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:
- 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
MAX6746KA23+T FAQ
1.How can I place an order for MAX6746KA23+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6746KA23+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 MAX6746KA23+T reliable?
The price and inventory of MAX6746KA23+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6746KA23+T is usually 5 days.
3.What payment methods are accepted for MAX6746KA23+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6746KA23+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6746KA23+T?
MAX6746KA23+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6746KA23+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 MAX6746KA23+T?
For technical support, including MAX6746KA23+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6746KA23+T requirements.
6.How does Aetrix verify that MAX6746KA23+T is sourced from the original manufacturer or authorized distributors?
All MAX6746KA23+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 MAX6746KA23+T meets industry standards.
7.What is the process for return or replacement of MAX6746KA23+T?
All MAX6746KA23+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6746KA23+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 MAX6746KA23+T part is unused and in its original packaging.
Return procedure for MAX6746KA23+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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