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Analog Devices Inc./Maxim Integrated MAX6340UK32+T
- Part No.:
- MAX6340UK32+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6340UK32+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6340UK32+T from Analog Devices is a low-power microprocessor supervisor IC with open-drain active-low reset output, 3.2V ±2.5% factory-trimmed reset threshold, capacitor-adjustable reset timeout (3.0–5.75ms with 1500pF), and guaranteed operation down to VCC = 1V. It monitors supply voltage in battery-powered embedded controllers and portable equipment requiring precise brownout protection.
For engineers reviewing the MAX6340UK32+T datasheet, MAX6340UK32+T pinout, MAX6340UK32+T application, or MAX6340UK32+T equivalent, key selection criteria include its 5-pin SOT23-5 open-drain output architecture, 1.6µA typical quiescent current, -40°C to +125°C operating range, and compatibility with wired-OR reset schemes in automotive and medical systems.
Technical Context
The MAX6340UK32+T implements a precision voltage-detection circuit using laser-trimmed resistors to set its 3.2V reset threshold with ±2.5% accuracy over temperature. Its internal 240nA ramp current source charges an external capacitor on the SRT pin to generate a programmable reset timeout period.
Reset assertion occurs when VCC falls below the threshold; deassertion requires both VCC rise above threshold and full capacitor ramp to 0.65V. The open-drain RESET output supports logic-level translation up to 5.5V and wired-OR configuration with auxiliary reset sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.2V ±2.5% (factory-trimmed; ensures reliable brownout detection at nominal 3.3V rail) |
| Quiescent Current | 1.6µA typ (enables multi-year battery life in portable medical devices) |
| Reset Timeout Range | 0.275ms to >5.75ms (set by 0–1500pF capacitor; covers µP initialization timing across ARM Cortex-M and PIC families) |
| Operating Voltage | 1.0V to 5.5V (valid reset assertion even during deep brownout; supports Li-ion discharge down to 2.5V) |
| Temperature Range | -40°C to +125°C (qualified for under-hood automotive and industrial control environments) |
| Output Type | Active-low open-drain (allows level-shifting, wired-OR reset, and interface with 1.8V/2.5V/3.3V/5V µP reset inputs) |
| VCC to Reset Delay | 80µs (fast response to supply collapse; prevents spurious code execution during power transients) |
Pinout & Package
MAX6340UK32+T is housed in a 5-pin SOT23-5 package (package code U5+2), RoHS-compliant, tape-and-reel format. Pin 1 is SRT (Set Reset Timeout), Pin 2 is GND, Pin 3 is RESET (open-drain output), Pin 4 is N.C. (not internally connected), and Pin 5 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SRT | Capacitor-adjustable timeout input | Connects to external timing capacitor; 240nA current source ramps voltage to 0.65V to define reset hold time |
| 2 - GND | Ground reference | Return path for internal bias and reset comparator; must be low-impedance for accurate threshold tracking |
| 3 - RESET | Active-low open-drain output | Drives low during reset; requires external pullup (10kΩ–100kΩ) to target logic supply (0–5.5V) |
| 4 - N.C. | No internal connection | May be tied to GND for mechanical stability; no electrical function or signal routing required |
| 5 - VCC | Supply and monitored voltage input | Power source and voltage sense node; operates and asserts reset valid down to 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise matching to µP reset timing requirements without firmware changes or BOM variants |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic system behavior during deep brownout-critical for data logging and safety-critical shutdown |
| Immunity to short VCC transients | Rejects <50µs glitches at 100mV below threshold, eliminating false resets in noisy automotive or motor-control environments |
| Open-drain RESET with 5.5V tolerance | Permits direct interfacing to µPs with different I/O voltages (e.g., 1.8V core + 3.3V I/O) without level translators |
| Low 1.6µA quiescent current | Reduces standby power in always-on battery systems-e.g., wearable health monitors drawing <10µA total system current |
Applications
| Portable Medical Sensors | Automotive Body Control Modules |
|---|---|
Use Scenario: Continuous glucose monitor powered by coin-cell battery with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Voltage supervisor ensuring µP remains held in reset until stable 3.3V rail is established after wake-up from ultra-low-power sleep. Use Value: 1.6µA ICC and 3.2V threshold prevent premature boot during battery voltage sag, extending usable battery life by >18 months. | Use Scenario: Door module controlling window lift, mirror fold, and interior lighting in 12V vehicle electrical system. IC Role / Device Role / Timing Role: Brownout detector asserting reset during cranking-induced voltage dip (<6V) to prevent EEPROM corruption and erratic actuator behavior. Use Value: -40°C to +125°C rating and transient immunity ensure reliable reset assertion during cold-start and under-hood thermal cycling. |
| Industrial PLC I/O Cards | Smart Energy Meters |
Use Scenario: DIN-rail mounted controller with isolated 24V DC input powering FPGA-based I/O processing. IC Role / Device Role / Timing Role: Supervisor monitoring local 3.3V LDO output; open-drain RESET wired-OR'd with watchdog timer output for dual-fault reset coverage. Use Value: N.C. pin simplifies PCB layout; SRT capacitor tuning allows identical hardware to support multiple FPGA boot timing profiles. | Use Scenario: Revenue-grade meter with tamper detection, RTC backup, and RF mesh communication. IC Role / Device Role / Timing Role: Primary reset generator for ARM Cortex-M4 host MCU, coordinating with supercapacitor-backed RTC during main power loss. Use Value: 3.2V threshold aligns with Li-SOCl₂ backup cell cutoff; open-drain output enables shared reset bus across metrology ASIC and comms SoC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6425UK32+T | Same 5-pin SOT23-5 package, identical 3.2V threshold and open-drain output, but newer revision with enhanced ESD rating (±4kV HBM) | Preferred for new designs requiring higher robustness in handling-sensitive manufacturing or field-repair environments | Select MAX6425UK32+T if board space and pinout are fixed and improved ESD immunity is required. |
| NCP302LSN32T1G | 3.2V threshold, push-pull active-low output, 1.1µA ICC, SOT23-5-but no capacitor-adjustable timeout (fixed 200ms) | Suitable only where fixed long reset delay suffices; incompatible with µPs needing sub-millisecond timing or dynamic timeout adjustment | Choose NCP302LSN32T1G only for cost-sensitive, non-timing-critical applications where fixed delay is acceptable. |
Compared with MAX6340UK32+T, MAX6425UK32+T offers identical functionality with upgraded ESD protection, while NCP302LSN32T1G trades adjustable timing for lower cost and static delay-making MAX6340UK32+T optimal for designs requiring precise, tunable reset hold times across voltage and temperature.
Availability
MAX6340UK32+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, and industrial PLC I/O cards requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6340UK32+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, engineered specifically for ultra-low-power, high-accuracy reset generation in battery-constrained and thermally demanding embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6340UK32+T and how tightly is it specified?
The MAX6340UK32+T features a factory-laser-trimmed reset threshold of 3.200V, with ±2.5% accuracy over the full -40°C to +125°C operating temperature range. At +25°C, the tolerance tightens to ±1.5%, meaning the actual threshold falls between 3.152V and 3.248V. This precision eliminates need for external calibration in critical applications like energy metering and automotive control.
Can MAX6340UK32+T operate reliably when VCC drops below 2.0V, and what happens to the RESET output?
Yes, MAX6340UK32+T guarantees valid RESET assertion and deassertion down to VCC = 1.0V. Below 2.0V, its quiescent current remains stable at ~1.6µA, and the open-drain RESET output maintains full sink capability (VOL ≤ 0.3V at 500µA). This ensures deterministic reset behavior during deep brownout-unlike many supervisors that fail or float below 1.8V.
How do I calculate the SRT capacitor value needed for a 4.0ms reset timeout with MAX6340UK32+T?
Use the formula CSRT = (tRP − 275µs) / 2.735 × 10⁶, where tRP is in seconds. For 4.0ms: CSRT = (0.004 − 0.000275) / 2,735,000 ≈ 1362pF. A standard 1300pF or 1500pF X7R ceramic capacitor yields 3.92ms or 4.37ms timeout-well within datasheet tolerance. Keep SRT traces short and away from noise sources to avoid timing drift.
Is MAX6340UK32+T pin-compatible with any industry-standard alternatives, and what are the constraints?
MAX6340UK32+T is explicitly stated as pin-compatible with LP3470 (same 5-pin SOT23-5 footprint and open-drain output), but differs in reset threshold (LP3470 is 3.08V) and timeout adjustability (LP3470 uses resistor-based timeout). No other drop-in replacements are documented; substitutions require validation of threshold match, timing, and output drive strength.
Does MAX6340UK32+T meet automotive qualification standards, and which specific grades apply?
The MAX6340UK32+T itself is not AEC-Q100 qualified per the datasheet; however, the related MAX6340UK31/V+T variant is explicitly listed as AEC-Q100 qualified. For automotive use, designers must select the /V+T suffix version-MAX6340UK32+T is intended for industrial and medical applications meeting the same -40°C to +125°C temperature grade but without formal automotive qualification testing.
MAX6340UK32+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:
- 3.2V
- 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
MAX6340UK32+T FAQ
1.How can I place an order for MAX6340UK32+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6340UK32+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 MAX6340UK32+T reliable?
The price and inventory of MAX6340UK32+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6340UK32+T is usually 5 days.
3.What payment methods are accepted for MAX6340UK32+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6340UK32+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6340UK32+T?
MAX6340UK32+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6340UK32+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 MAX6340UK32+T?
For technical support, including MAX6340UK32+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6340UK32+T requirements.
6.How does Aetrix verify that MAX6340UK32+T is sourced from the original manufacturer or authorized distributors?
All MAX6340UK32+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 MAX6340UK32+T meets industry standards.
7.What is the process for return or replacement of MAX6340UK32+T?
All MAX6340UK32+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6340UK32+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 MAX6340UK32+T part is unused and in its original packaging.
Return procedure for MAX6340UK32+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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