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Analog Devices Inc./Maxim Integrated MAX6334UR16D2+T
- Part No.:
- MAX6334UR16D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6334UR16D2+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,127
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Product details
Overview
MAX6334UR16D2+T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit in a 3-pin SOT23 package, designed for 1.8V–3.3V digital systems. It asserts reset when VCC falls below 1.60V (±3% over temperature), maintains reset for ≥20ms after VCC recovers, draws only 3.3µA at 2.5V, and operates down to VCC = 1.0V - enabling reliable power monitoring in battery-powered controllers and portable instrumentation.
For engineers reviewing the MAX6334UR16D2+T datasheet, MAX6334UR16D2+T pinout, MAX6334UR16D2+T application, or MAX6334UR16D2+T equivalent, key selection criteria include its factory-trimmed 1.6V reset threshold, 20ms minimum timeout, open-drain output compatibility with bidirectional μP reset pins (e.g., Motorola 68HC11), and guaranteed operation down to 1.0V supply voltage.
Technical Context
The MAX6334UR16D2+T implements a precision bandgap-based reset comparator with ±3% threshold tolerance over –40°C to +125°C and immunity to VCC transients ≤24µs at 10V/ms slew rate. Its open-drain RESET output requires an external pull-up and supports wired-OR configurations with microcontrollers having bidirectional reset I/O.
This variant belongs to the MAX6334 family with fixed 1.6V reset threshold (UR16 suffix) and 20ms nominal timeout (D2 suffix). Unlike push-pull variants (MAX6332/MAX6333), it guarantees correct reset state only down to VCC = 1.0V - not 0.7V - due to open-drain architecture limitations under ultra-low supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.60V ±3% over –40°C to +125°C - ensures deterministic brownout detection for 1.8V logic rails |
| Reset Timeout Period | 20ms minimum - meets boot-time hold requirements for ARM Cortex-M0 and similar low-power MCUs |
| Supply Voltage Range | 1.0V to 5.5V - supports operation during deep battery discharge while excluding sub-1.0V invalid states |
| Quiescent Current | 3.3µA typical at 2.5V - enables >10-year battery life in coin-cell–powered IoT sensors |
| RESET Output Type | Open-drain, active-low - allows direct interface to bidirectional μP reset pins without level-shifting |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| VCC Propagation Delay | 24µs max at 10V/ms - rejects fast supply glitches without false resets |
Pinout & Package
MAX6334UR16D2+T is housed in a RoHS-compliant, lead-free 3-pin SOT23 package (package code U3+1, outline 21-0051) with 0.95mm pitch and thermal pad omitted. The compact 2.92mm × 1.3mm footprint supports high-density PCB layouts in space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be connected directly to system ground plane |
| 2 | RESET | Open-drain active-low reset output; requires external pull-up resistor (typically 10kΩ–100kΩ) to VCC or higher rail |
| 3 | VCC | Power supply input (1.0V–5.5V); decoupling capacitor (0.1µF ceramic) required within 5mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 1.6V reset threshold | Eliminates external resistor networks and calibration steps for precise 1.8V system monitoring |
| 20ms minimum reset timeout | Ensures full initialization of flash memory and PLLs before release in embedded microcontrollers |
| Open-drain RESET with <0.4V VOL @ 50µA | Guarantees clean logic-low assertion compatible with 1.8V/2.5V/3.3V I/O standards |
| 1.0V minimum operating voltage | Enables supervision during final battery discharge phase without premature timeout expiration |
| Transient immunity up to 24µs at 10V/ms | Prevents spurious resets from switching noise on shared DC-DC converter outputs |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable ECG monitor powered by CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises 1.8V analog front-end and 3.3V BLE SoC supply; asserts reset during battery voltage sag below 1.6V. Use Value: Prevents corrupted sensor data capture and BLE link failure by holding MCU in reset until stable 1.8V rail is restored for ≥20ms. |
Use Scenario: DIN-rail mounted remote I/O terminal with isolated 24V-to-3.3V DC-DC converter. IC Role / Device Role / Timing Role: Monitors 3.3V logic rail for brownout events caused by load transients on field-side power bus. Use Value: Ensures deterministic recovery of Modbus RTU communication stack after power interruption without firmware corruption. |
| Automotive Body Control Units | Smart Energy Meters |
|
Use Scenario: Door module with LIN transceiver and 16-bit MCU operating from vehicle battery (9V–16V) via LDO. IC Role / Device Role / Timing Role: Resets MCU when LDO output drops below 1.6V during cold-crank (battery dips to 6V). Use Value: Guarantees safe shutdown of window motor drivers and prevents partial actuation during unstable supply conditions. |
Use Scenario: Revenue-grade electricity meter with real-time clock and metrology ASIC powered from auxiliary 3.3V rail. IC Role / Device Role / Timing Role: Holds metrology ASIC in reset during AC mains dropout to prevent erroneous kWh accumulation. Use Value: Maintains regulatory compliance (IEC 62053) by eliminating measurement drift during brief (<20ms) supply interruptions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6334UR16D3+T | 100ms minimum reset timeout vs. 20ms; identical 1.6V threshold and open-drain output | Required where longer reset hold time is needed for complex FPGA configuration or multi-stage bootloaders | Select MAX6334UR16D3+T if system boot sequence exceeds 20ms; otherwise MAX6334UR16D2+T minimizes unnecessary delay. |
| TLV803EC16DBVR | 1.6V threshold, 20ms timeout, but push-pull active-low output and 1.4V min VCC operation | Compatible with systems requiring valid reset down to 1.4V, but lacks open-drain flexibility for wired-OR reset buses | Choose TLV803EC16DBVR only if push-pull drive is acceptable and sub-1.6V reset validity is critical; MAX6334UR16D2+T remains preferred for bidirectional μP interfaces. |
Compared with MAX6334UR16D3+T, the MAX6334UR16D2+T reduces boot latency by 80ms; compared with TLV803EC16DBVR, it provides essential open-drain functionality for shared reset busses but trades 0.4V lower minimum supply voltage.
Availability
MAX6334UR16D2+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6334UR16D2+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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX6334 series targets ultra-low-voltage microprocessor supervision in space- and power-constrained systems, emphasizing factory-trimmed accuracy, transient immunity, and minimal external component count.
FAQ
What is the exact reset threshold voltage of MAX6334UR16D2+T and how does it vary with temperature?
The MAX6334UR16D2+T has a factory-trimmed nominal reset threshold of 1.60V at +25°C, with tolerance of ±1.8% at room temperature and ±3% over the full –40°C to +125°C operating range. This ensures consistent brownout detection across automotive and industrial environments without external calibration.
Does MAX6334UR16D2+T support operation below 1.8V supply voltage?
Yes, MAX6334UR16D2+T operates down to VCC = 1.0V - verified per Absolute Maximum Ratings and Electrical Characteristics tables. Below 1.0V, the device is not guaranteed to maintain correct reset state, distinguishing it from MAX6332/MAX6333 variants rated to 0.7V.
What is the purpose of the "D2" suffix in MAX6334UR16D2+T?
The "D2" suffix in MAX6334UR16D2+T specifies a nominal reset timeout period of 20ms minimum. This value is factory-programmed and ensures the RESET signal remains asserted for at least 20ms after VCC rises above the 1.60V threshold, satisfying boot timing requirements for most 32-bit microcontrollers.
Can MAX6334UR16D2+T be used with a microcontroller that has a bidirectional reset pin?
Yes, MAX6334UR16D2+T is specifically suited for bidirectional reset interfaces due to its open-drain RESET output. When paired with an external pull-up resistor, it allows either the supervisor or the microcontroller (e.g., Motorola 68HC11) to assert reset on the shared line - a capability not supported by push-pull alternatives.
Is a pull-up resistor required for MAX6334UR16D2+T's RESET pin, and what value is recommended?
Yes, an external pull-up resistor is mandatory for MAX6334UR16D2+T's open-drain RESET output. A value between 10kΩ and 100kΩ is recommended - 47kΩ is commonly used - to ensure sufficient rise time while minimizing current draw during reset assertion. The resistor must connect to the same or higher voltage rail as the monitored VCC.
MAX6334UR16D2+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.6V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6334UR16D2+T FAQ
1.How can I place an order for MAX6334UR16D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6334UR16D2+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 MAX6334UR16D2+T reliable?
The price and inventory of MAX6334UR16D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6334UR16D2+T is usually 5 days.
3.What payment methods are accepted for MAX6334UR16D2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6334UR16D2+T transactions.
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4.How is shipping managed for MAX6334UR16D2+T?
MAX6334UR16D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6334UR16D2+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 MAX6334UR16D2+T?
For technical support, including MAX6334UR16D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6334UR16D2+T requirements.
6.How does Aetrix verify that MAX6334UR16D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6334UR16D2+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 MAX6334UR16D2+T meets industry standards.
7.What is the process for return or replacement of MAX6334UR16D2+T?
All MAX6334UR16D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6334UR16D2+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 MAX6334UR16D2+T part is unused and in its original packaging.
Return procedure for MAX6334UR16D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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