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Analog Devices Inc./Maxim Integrated MAX6340UK46+T
- Part No.:
- MAX6340UK46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6340UK46+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:176
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Product details
Overview
The MAX6340UK46+T from Analog Devices is a low-power microprocessor supervisor IC that monitors VCC supply voltage and asserts an active-low open-drain reset signal when voltage falls below 4.625V (typical), with capacitor-adjustable timeout (3.0–5.75ms at CSRT = 1500pF), guaranteed operation down to VCC = 1V, and 1.6µA typical quiescent current-used in battery-powered controllers and portable equipment for reliable power-up/brownout reset control.
For engineers reviewing the MAX6340UK46+T datasheet, MAX6340UK46+T pinout, MAX6340UK46+T application, or MAX6340UK46+T equivalent, key selection factors include its 4.625V reset threshold accuracy (±2.5% over temperature), SOT23-5 open-drain output compatibility with multiple logic supplies, capacitor-set timeout flexibility, and AEC-Q100 qualification eligibility for automotive-grade designs.
Technical Context
This device implements a precision voltage-detection architecture using laser-trimmed resistors to set the 4.625V nominal reset threshold, with 4.3mV hysteresis and immunity to sub-50µs VCC transients exceeding 100mV below threshold. The SRT pin hosts a 240nA constant-current ramp source charging an external capacitor to generate the reset timeout delay.
Its open-drain RESET output requires an external pullup (10kΩ–100kΩ) to any supply up to 5.5V, enabling wired-OR reset configurations and logic-level translation across mixed-voltage systems-distinct from push-pull variants like MAX6424UK46+T.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.625V (typ), ±2.5% over -40°C to +125°C - ensures reliable detection of 5V rail brownout before µP malfunction |
| Quiescent Current | 1.6µA (typ) at VCC ≤ 2.0V - enables multi-year battery life in always-on monitoring applications |
| Reset Timeout Range | 0.275ms (CSRT = 0) to >5.75ms (CSRT = 1500pF) - adjustable via external capacitor for diverse µP reset timing requirements |
| Output Type | Active-low open-drain - supports wired-OR reset, level-shifting, and interfacing with 0–5.5V logic supplies |
| Operating Voltage | 1.0V to 5.5V - guarantees valid reset assertion even during deep brownout conditions |
| VCC to Reset Delay | 80µs (typ) - fast response to supply collapse prevents erroneous code execution |
| Package | SOT23-5 - compact 2.9mm × 1.6mm footprint suitable for space-constrained portable PCBs |
Pinout & Package
MAX6340UK46+T is housed in a 5-pin SOT23-5 package (2.9mm × 1.6mm, 0.95mm height) with gull-wing leads, RoHS-compliant lead-free finish ("+T" suffix), and thermal pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SRT | Set Reset Timeout input - connects to external capacitor (CSRT) to program reset hold time; sensitive to leakage and stray capacitance |
| 2 | GND | Ground reference - common return path for internal circuitry and external capacitor |
| 3 | N.C. | No internal connection - must be left unconnected or tied to GND per layout best practice |
| 4 | VCC | Supply voltage and reset threshold monitor input - powers device and defines monitored rail |
| 5 | RESET | Active-low open-drain reset output - sinks current when asserted; requires external pullup resistor |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise µP reset duration tuning (0.275–5.75ms+) without firmware or hardware changes |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic system reset behavior during deep undervoltage events where most supervisors fail |
| Immunity to short VCC transients | Rejects <50µs glitches ≥100mV below threshold, eliminating false resets in noisy power environments |
| Open-drain output with 5.5V-tolerant pullup | Permits direct interface to 3.3V, 2.5V, or 1.8V µP reset inputs without level translators |
| Laser-trimmed threshold accuracy | Delivers ±2.5% reset voltage tolerance over full industrial temperature range (-40°C to +125°C) |
Applications
| Battery-Powered Portable Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: Real-time monitoring of 5V supply in handheld medical diagnostic devices powered by Li-ion batteries. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low reset to ARM Cortex-M0+ MCU during battery sag or charger disconnect. Use Value: Prevents corrupted memory writes and firmware lockup by holding µP in reset until VCC stabilizes above 4.625V with 3.5ms timeout. | Use Scenario: Monitoring 5V rail in door module ECUs exposed to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Brownout detector triggering controlled shutdown sequence in LIN bus slave nodes. Use Value: Survives 100mV/50µs transients on VCC and maintains reset assertion down to 1V, ensuring safe state retention during cranking. |
| Industrial IoT Sensor Nodes | Medical Infusion Pump Controllers |
Use Scenario: Long-life wireless sensor node operating from primary alkaline cells with gradual voltage decay. IC Role / Device Role / Timing Role: Low-quiescent (1.6µA) supervisor enabling >10-year battery life while guaranteeing clean µP restart at end-of-life voltage. Use Value: Eliminates need for external wake-up circuitry; open-drain output interfaces directly to 3.3V ESP32 reset pin via 10kΩ pullup. | Use Scenario: Safety-critical reset management in Class II medical infusion pump with dual-redundant µPs. IC Role / Device Role / Timing Role: Primary reset supervisor with externally adjustable timeout synchronized to motor driver enable sequencing. Use Value: Capacitor-programmable tRP allows matching reset hold time to mechanical actuator settling time (e.g., 4.375ms at CSRT = 1500pF). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6425UK46+T | Same 4.625V threshold, identical SOT23-5 open-drain output, but includes factory-trimmed hysteresis and tighter initial accuracy (±1.5% at +25°C) | Preferred for high-precision applications requiring minimal threshold drift over temperature cycling | Select MAX6425UK46+T when tighter initial threshold tolerance and enhanced hysteresis stability are required |
| NCP302LSN46T1G | 4.6V fixed threshold, 1.8µA IQ, push-pull output, SOT23-5 - no capacitor-adjustable timeout; fixed 200ms delay | Suitable for cost-sensitive designs where fixed reset duration suffices and level-shifting is unnecessary | Choose NCP302LSN46T1G only if open-drain flexibility and timeout adjustability are not needed |
Compared with MAX6340UK46+T, MAX6425UK46+T offers improved accuracy but same pinout and function, while NCP302LSN46T1G trades adjustability and open-drain versatility for lower unit cost and simpler BOM-making it viable only in non-critical, fixed-timing applications.
Availability
MAX6340UK46+T is available at Aetrix Electronics and suitable for battery-powered portable controllers, automotive body control modules, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6340UK46+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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The MAX6340 series belongs to Analog Devices' microprocessor supervisor product line, engineered for ultra-low-power, high-accuracy voltage monitoring in safety-critical and battery-constrained systems.
FAQ
What is the exact reset threshold voltage of the MAX6340UK46+T?
The MAX6340UK46+T has a nominal reset threshold of 4.625V, with ±1.5% accuracy at +25°C and ±2.5% over the full operating temperature range (-40°C to +125°C), as specified in Table 1 of the datasheet. This value is laser-trimmed at wafer test and confirmed for each unit.
How do I calculate the external capacitor value for a desired reset timeout on the MAX6340UK46+T?
Use the formula CSRT = (tRP − 275µs) / 2.735 × 10⁶, where tRP is the desired timeout in seconds and CSRT is in farads. For example, a 4.375ms timeout requires CSRT = (0.004375 − 0.000275) / 2.735e6 ≈ 1500pF. Ceramic capacitors with <10nA leakage are recommended.
Can the MAX6340UK46+T drive a 3.3V microcontroller reset input directly?
Yes-the MAX6340UK46+T features an open-drain RESET output compatible with any pullup supply from 0V to 5.5V. Connect a 10kΩ–100kΩ resistor from RESET to the 3.3V domain; the output sinks ≤0.4V at 3.2mA, ensuring solid logic-low assertion for standard CMOS inputs.
Is the MAX6340UK46+T qualified for automotive applications?
The MAX6340UK46+T is not individually AEC-Q100 qualified, though the MAX6340UK31/V+T variant is explicitly listed as AEC-Q100 qualified. Designers targeting automotive use should verify qualification status per specific part number and consult Analog Devices' automotive product roadmap for certified alternatives.
What is the maximum allowable voltage on the SRT pin of the MAX6340UK46+T?
The SRT pin of the MAX6340UK46+T is rated for −0.3V to +6.0V per Absolute Maximum Ratings. However, normal operation requires SRT to be connected only to the external timing capacitor and ground; applying external voltage or current risks disrupting the 240nA ramp current source and invalidating timeout accuracy.
MAX6340UK46+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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-23-5
MAX6340UK46+T FAQ
1.How can I place an order for MAX6340UK46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6340UK46+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 MAX6340UK46+T reliable?
The price and inventory of MAX6340UK46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6340UK46+T is usually 5 days.
3.What payment methods are accepted for MAX6340UK46+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6340UK46+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6340UK46+T?
MAX6340UK46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6340UK46+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 MAX6340UK46+T?
For technical support, including MAX6340UK46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6340UK46+T requirements.
6.How does Aetrix verify that MAX6340UK46+T is sourced from the original manufacturer or authorized distributors?
All MAX6340UK46+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 MAX6340UK46+T meets industry standards.
7.What is the process for return or replacement of MAX6340UK46+T?
All MAX6340UK46+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6340UK46+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 MAX6340UK46+T part is unused and in its original packaging.
Return procedure for MAX6340UK46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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