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Analog Devices Inc./Maxim Integrated MAX6747KA46+T
- Part No.:
- MAX6747KA46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6747KA46+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:9,333
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Product details
Overview
MAX6747KA46+T from Analog Devices is a low-power microprocessor supervisory circuit with factory-trimmed 4.625V VCC reset threshold, manual-reset input (MR), push-pull active-low RESET output, and capacitor-adjustable reset/watchdog timeout. It monitors single supply voltage (1.2V–5.5V), provides ±2% threshold accuracy over –40°C to +125°C, and delivers 3.7µA supply current for battery-powered automotive controllers.
For engineers reviewing the MAX6747KA46+T datasheet, MAX6747KA46+T pinout, MAX6747KA46+T application, or MAX6747KA46+T equivalent, key selection criteria include its AEC-Q100 qualification, MR-enabled field-service reset capability, 4.625V fixed VCC threshold with 2% tolerance, 8-pin SOT23 automotive package, and compatibility with external timing capacitors for configurable reset (tRP) and watchdog (tWD) delays.
Technical Context
The MAX6747KA46+T implements a dual-path reset assertion logic: one path triggers on VCC falling below 4.625V ±2%, the other on MR pull-down; both hold RESET low for a user-defined timeout period set by CSRT. Its watchdog timer operates in normal mode only (no WDS pin), with timeout determined solely by CSWT and scaled via tWD = 4.94×10⁶ × CSWT (seconds).
No windowed watchdog or extended-mode (128×) functionality is present - unlike MAX6752/MAX6753 or MAX6746–MAX6751 with WDS - and it lacks RESET IN monitoring, confirming its role as a single-supply VCC-only supervisor with manual-reset support and push-pull output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.625V ±2% (factory-trimmed); ensures reliable reset assertion during brownout at nominal 4.8V rail |
| Supply Current | 3.7µA typical at VCC ≤ 2.0V; enables >10-year battery life in always-on vehicle modules |
| Reset Timeout Range | 0.506ms to 9.487ms (CSRT = 100pF to 1500pF); covers boot-time requirements from fast MCUs to legacy 8051s |
| Watchdog Timeout Range | 0.506ms to 9.487ms (CSWT = 100pF to 1500pF); supports firmware service intervals from 500µs to 10ms |
| Operating Temp | –40°C to +125°C; fully specified for under-hood automotive electronics per AEC-Q100 Grade 0 |
| RESET Output Type | Push-pull active-low; drives µP reset pin directly without external pull-up, valid down to VCC ≥ 1V |
| Manual Reset Input | MR internally pulled up to VCC; accepts 1µs minimum low pulse; rejects 100ns glitches |
Pinout & Package
MAX6747KA46+T is housed in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176), optimized for high-density automotive PCBs with thermal resistance qJA = 196°C/W on four-layer board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR (Manual Reset) | Active-low input; internal 12–28kΩ pull-up to VCC; initiates reset when pulled low ≥1µs |
| 2 | WDS | No-connect (NC); unused in MAX6747 - differs from MAX6746/MAX6748–MAX6751 which use WDS for extended watchdog mode |
| 3 | SWT | Watchdog timeout capacitor node; sets tWD = 4.94×10⁶ × CSWT (s); connect to GND to disable watchdog |
| 4 | SRT | Reset timeout capacitor node; sets tRP = 4.94×10⁶ × CSRT (s); determines duration RESET stays asserted |
| 5 | GND | Ground reference for all analog comparators, timers, and digital logic |
| 6 | WDI | Watchdog input; falling edge clears timer; must not float - tie to GND via 100kΩ if unused |
| 7 | RESET | Push-pull active-low output; sinks 50µA @ 0.3V max VOL; sources 200µA @ 0.8×VCC min VOH |
| 8 | VCC | Power supply input (1.2–5.5V); powers internal comparators, timers, and RESET driver |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.625V reset threshold | Eliminates external resistor divider; reduces BOM count and layout area vs adjustable supervisors |
| MR input with internal pull-up | Enables direct switch connection without external components; simplifies field-service reset implementation |
| Capacitor-adjustable reset timeout | Allows precise match to µP boot time across temperature without trimming or calibration |
| Capacitor-adjustable watchdog timeout | Permits firmware-tuned watchdog service interval without changing IC or firmware revision |
| AEC-Q100 qualified | Validated for automotive use including HTOL, TC, ESD, and EM test compliance per Grade 0 |
Applications
| Automotive Body Control Module | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors 5V system rail in door module MCU during cold-crank and load-dump events. IC Role / Device Role / Timing Role: Single-supply VCC supervisor asserting RESET during brownout <4.533V and holding for 7.6ms after recovery. Use Value: Prevents MCU code corruption during battery voltage sag; MR allows technician-initiated reinitialization without power cycle. | Use Scenario: Ensures safe restart of ARM-based pump controller after battery swap or low-voltage alarm. IC Role / Device Role / Timing Role: Provides guaranteed RESET assertion at VCC <4.625V ±2% and holds for 5.7ms, meeting IEC 62304 Class C timing safety requirements. Use Value: Enables deterministic boot state after power interruption; push-pull output eliminates external pull-up, reducing leakage risk in isolated HV sections. |
| Industrial PLC I/O Submodule | Telematics Control Unit (TCU) |
Use Scenario: Supervises 3.3V FPGA configuration supply in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Asserts RESET when VCC drops below 4.625V (monitored via resistive divider from 5V rail), with 9.5ms timeout. Use Value: Guarantees FPGA reconfiguration only after stable 3.3V rail; MR permits remote reset via optocoupler-driven signal. | Use Scenario: Resets LTE modem SoC during CAN bus wake-up sequence in vehicle telematics unit. IC Role / Device Role / Timing Role: Generates synchronized RESET pulse upon VCC stabilization and validates watchdog activity via WDI strobing every 8ms. Use Value: Eliminates race conditions between modem boot and CAN initialization; 3.7µA ICC extends sleep-mode battery runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6746KA46+T | Identical reset threshold and timing specs, but lacks MR input - uses WDS instead for extended watchdog mode | Not suitable where field-service manual reset is required; requires redesign to add external MR circuit | Select MAX6747KA46+T when MR functionality is mandatory and extended watchdog is unnecessary |
| TLV809E46DBVR | Fixed 4.63V threshold, no watchdog or MR; 1.8µA ICC; SOT23-3 package (3 pins vs 8) | Only provides basic reset - no timeout adjustability, no watchdog, no manual reset | Choose TLV809E46DBVR only for cost-sensitive, space-constrained designs needing minimal reset-only function |
Compared with MAX6746KA46+T, the MAX6747KA46+T adds MR while removing WDS functionality - making it optimal for automotive modules requiring operator-initiated reset without extended watchdog overhead. Versus TLV809E46DBVR, it trades ultra-low ICC and small footprint for full supervisory features including adjustable timeouts and robust MR interface.
Availability
MAX6747KA46+T is available at Aetrix Electronics and suitable for automotive body control units, medical infusion pump controllers, industrial PLC I/O submodules, telematics control units, and critical µP monitoring applications requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX6747KA46+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, communications, and healthcare markets.
The MAX6746–MAX6753 family was designed specifically for AEC-Q100-compliant automotive microprocessor supervision, emphasizing low ICC, wide temperature operation, and flexible reset/watchdog configurability in compact SOT23 packaging.
FAQ
What is the exact factory-trimmed reset threshold voltage for MAX6747KA46+T?
The MAX6747KA46+T has a factory-trimmed VCC reset threshold of 4.625V with ±2% tolerance over –40°C to +125°C, as confirmed by Table 2 (suffix "46") and Electrical Characteristics section. This value is laser-trimmed at wafer test and does not require external resistor networks.
Does MAX6747KA46+T support dual-voltage monitoring?
No. The MAX6747KA46+T monitors only the VCC supply voltage using its fixed 4.625V threshold. It does not include RESET IN input or adjustable threshold circuitry - unlike MAX6748–MAX6751 - and cannot monitor a second voltage rail.
Can the watchdog timer on MAX6747KA46+T be disabled?
Yes. To disable the watchdog timer on MAX6747KA46+T, connect the SWT pin directly to GND. This prevents the internal watchdog counter from starting, eliminating unintended resets while retaining full reset supervision functionality.
What is the minimum pulse width required on the MR pin of MAX6747KA46+T to assert reset?
The MR pin of MAX6747KA46+T requires a minimum low pulse width of 1µs to reliably assert the RESET output. The device also rejects transients shorter than 100ns, ensuring immunity to noise-induced false resets.
Is MAX6747KA46+T compatible with 1.8V microcontrollers?
Yes. The MAX6747KA46+T operates with VCC as low as 1.2V and guarantees valid RESET output down to VCC ≥ 1V. Its push-pull RESET output maintains VOH ≥ 0.8×VCC and VOL ≤ 0.3V at ISOURCE/ISINK levels appropriate for 1.8V logic interfaces.
MAX6747KA46+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:
- 4.625V
- 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
MAX6747KA46+T FAQ
1.How can I place an order for MAX6747KA46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6747KA46+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 MAX6747KA46+T reliable?
The price and inventory of MAX6747KA46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6747KA46+T is usually 5 days.
3.What payment methods are accepted for MAX6747KA46+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6747KA46+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6747KA46+T?
MAX6747KA46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6747KA46+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 MAX6747KA46+T?
For technical support, including MAX6747KA46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6747KA46+T requirements.
6.How does Aetrix verify that MAX6747KA46+T is sourced from the original manufacturer or authorized distributors?
All MAX6747KA46+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 MAX6747KA46+T meets industry standards.
7.What is the process for return or replacement of MAX6747KA46+T?
All MAX6747KA46+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6747KA46+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 MAX6747KA46+T part is unused and in its original packaging.
Return procedure for MAX6747KA46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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