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Analog Devices Inc./Maxim Integrated MAX6340UK40+T
- Part No.:
- MAX6340UK40+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6340UK40+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6340UK40+T from Analog Devices is a low-power microprocessor supervisor IC that monitors 4.0V system supply voltage and asserts an active-low open-drain reset signal during brownout or power-up conditions. It features capacitor-adjustable reset timeout (3.0–5.75ms with 1500pF), guaranteed reset validity down to VCC = 1V, and 1.6µA typical quiescent current. It is used in battery-powered controllers and automotive ECUs for reliable µP initialization.
For engineers reviewing the MAX6340UK40+T datasheet, MAX6340UK40+T pinout, MAX6340UK40+T application, or MAX6340UK40+T equivalent, key selection criteria include its 4.0V factory-trimmed reset threshold, SOT23-5 open-drain output architecture, capacitor-programmable timeout delay, and operation across –40°C to +125°C industrial temperature range.
Technical Context
The MAX6340UK40+T implements a precision voltage detector with laser-trimmed internal resistors to achieve ±1.5% reset threshold accuracy at +25°C and ±2.5% over full temperature range. Its reset assertion is triggered by VCC falling below 4.0V nominal, with built-in hysteresis of 4×VTH (16mV) to prevent chatter near threshold.
Reset deassertion timing is controlled by an internal 240nA current source charging an external capacitor (CSRT) connected between SRT and GND, referenced to a stable 0.65V internal ramp threshold. The device remains functional and guarantees valid RESET output down to VCC = 1V, enabling robust operation during deep brownout events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.00V nominal, ±1.5% at +25°C - ensures precise power-fail detection for 3.3V/5V systems |
| Quiescent Current | 1.6µA typical - enables multi-year battery life in portable medical and sensor nodes |
| Reset Timeout Range | 0.275ms to 5.75ms (CSRT = 0 to 1500pF) - supports µP reset hold times from fast-boot to safety-critical lockout |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| Output Type | Active-low open-drain - allows wired-OR reset combining and logic-level translation up to 5.5V |
| VCC Validity Limit | RESET guaranteed valid down to VCC = 1V - prevents undefined µP state during slow discharge |
| Immunity to Transients | Rejects ≤50µs negative VCC glitches ≥100mV below threshold - suppresses noise-induced false resets |
Pinout & Package
The MAX6340UK40+T is housed in a 5-pin SOT23-5 package with exposed pad (package code U5+2), footprint compatible with standard SOT23 land pattern 90-0174. Pin 1 is VCC, Pin 2 is GND, Pin 3 is SRT (capacitor-adjustable timeout input), Pin 4 is RESET (open-drain output), and Pin 5 is NC (not internally connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Supply and threshold monitor input | Primary power rail connection; voltage applied here sets both operating supply and reset trip point |
| 2 - GND | Ground reference | Return path for all internal circuitry and external capacitor (CSRT); must be low-impedance |
| 3 - SRT | Set Reset Timeout input | Connects to external timing capacitor; 240nA constant current charges CSRT to 0.65V to define tRP |
| 4 - RESET | Active-low open-drain output | Drives low during reset; requires external pullup (10kΩ–100kΩ) to any logic-compatible voltage (0–5.5V) |
| 5 - NC | No internal connection | May be left floating or tied to GND per layout best practice; no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.0V threshold | Laser-trimmed resistor network delivers ±1.5% accuracy at +25°C - eliminates need for external calibration |
| Capacitor-adjustable timeout | 2.73×10⁶ × CSRT + 275µs formula enables precise, application-specific reset hold time tuning |
| Open-drain RESET output | Supports wired-OR configuration with auxiliary reset sources and level-shifting to non-VCC logic domains |
| Valid operation down to VCC = 1V | Ensures deterministic reset behavior during slow power-down - critical for fail-safe embedded systems |
| Low-leakage SRT interface | 240nA ramp current source minimizes sensitivity to PCB leakage - enables accurate timeout with small CSRT values |
Applications
| Automotive Engine Control Unit (ECU) | Portable Medical Monitor |
|---|---|
Use Scenario: Monitors 5V supply rail in engine management system during cold cranking and load dump events. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low reset to MCU when VCC drops below 4.0V, holding reset for 4.375ms after recovery. Use Value: Prevents erratic MCU execution during unstable battery voltage, meeting ISO 16750-2 transient immunity requirements. | Use Scenario: Powers on/off sequence control in handheld ECG device using single-cell Li-ion battery (2.8–4.2V range). IC Role / Device Role / Timing Role: Detects undervoltage condition at 4.0V threshold and holds ARM Cortex-M0+ in reset until stable supply is confirmed. Use Value: Eliminates firmware corruption risk during battery depletion, extending usable runtime while ensuring safe shutdown. |
| Industrial PLC I/O Module | Smart Energy Meter |
Use Scenario: Supervises isolated 3.3V logic supply in DIN-rail mounted programmable controller exposed to wide ambient temperatures. IC Role / Device Role / Timing Role: Provides temperature-stable reset assertion (±2.5% over –40°C to +125°C) with open-drain output tied to backplane reset bus. Use Value: Enables reliable cold-start and brownout recovery in uncontrolled environments without requiring external voltage references. | Use Scenario: Ensures secure boot integrity in utility-grade meter with tamper-detection circuitry and real-time clock backup. IC Role / Device Role / Timing Role: Generates hardware reset pulse upon main supply dropout, with timeout set to exceed RTC oscillator stabilization time. Use Value: Guarantees cryptographic key loading and memory initialization complete before application firmware executes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP302HS40T1G | Fixed 4.0V threshold, push-pull output, no capacitor-adjustable timeout (fixed 200ms) | Lacks timeout flexibility; unsuitable where µP requires sub-millisecond reset hold | Select when board space is constrained and fixed long timeout suffices |
| TLV809E40DBZR | 4.0V threshold, open-drain output, fixed 200ms timeout, lower IQ (0.5µA) | Fixed timeout limits use in fast-boot systems; lacks transient immunity specs | Prefer for ultra-low-power battery applications where timing flexibility is secondary |
Compared with MAX6340UK40+T, NCP302HS40T1G offers simpler integration but sacrifices timeout adjustability, while TLV809E40DBZR reduces power consumption at the cost of design flexibility and documented transient rejection performance.
Availability
MAX6340UK40+T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical monitors, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6340UK40+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.
The MAX6340 series belongs to Analog Devices' precision voltage supervisor product line, designed specifically for reliable power-on reset and brownout protection in safety-critical embedded systems operating across harsh environmental conditions.
FAQ
What is the exact reset threshold voltage of the MAX6340UK40+T?
The MAX6340UK40+T has a factory-trimmed nominal reset threshold of 4.00V, with ±1.5% accuracy at +25°C and ±2.5% over the full –40°C to +125°C operating temperature range. This value is laser-trimmed during production and specified in the Electrical Characteristics table under VTH parameter. The "40" suffix in MAX6340UK40+T explicitly denotes the 4.0V threshold variant.
How do I calculate the external capacitor value for a desired reset timeout on the MAX6340UK40+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. The MAX6340UK40+T datasheet confirms this relationship applies directly to the MAX6340UK40+T variant.
Can the MAX6340UK40+T operate with a supply voltage below 4.0V?
Yes - the MAX6340UK40+T operates from VCC = 1.0V to 5.5V and guarantees valid RESET output down to VCC = 1.0V. Its internal circuitry remains functional and asserts reset correctly even when VCC falls below the 4.0V threshold. This capability is explicitly verified in the Absolute Maximum Ratings and Electrical Characteristics sections for MAX6340UK40+T.
What is the purpose of the NC pin (Pin 5) on the MAX6340UK40+T?
Pin 5 of the MAX6340UK40+T is Not Connected (NC) - it has no internal connection and serves no electrical function. Per the official Analog Devices pin configuration diagram and ordering guide, this pin may be left floating or tied to ground for mechanical stability; neither choice affects MAX6340UK40+T operation or specifications.
Does the MAX6340UK40+T meet AEC-Q100 automotive qualification standards?
No - only the MAX6340UK31/V+T variant is explicitly AEC-Q100 qualified per the datasheet's Benefits and Features section. The MAX6340UK40+T is rated for –40°C to +125°C operation and shares the same BiCMOS process and package construction, but AEC-Q100 stress test documentation applies solely to the /V+T suffix variant, not MAX6340UK40+T.
MAX6340UK40+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4V
- 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
MAX6340UK40+T FAQ
1.How can I place an order for MAX6340UK40+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6340UK40+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 MAX6340UK40+T reliable?
The price and inventory of MAX6340UK40+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6340UK40+T is usually 5 days.
3.What payment methods are accepted for MAX6340UK40+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6340UK40+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6340UK40+T?
MAX6340UK40+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6340UK40+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 MAX6340UK40+T?
For technical support, including MAX6340UK40+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6340UK40+T requirements.
6.How does Aetrix verify that MAX6340UK40+T is sourced from the original manufacturer or authorized distributors?
All MAX6340UK40+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 MAX6340UK40+T meets industry standards.
7.What is the process for return or replacement of MAX6340UK40+T?
All MAX6340UK40+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6340UK40+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 MAX6340UK40+T part is unused and in its original packaging.
Return procedure for MAX6340UK40+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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