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Analog Devices Inc./Maxim Integrated MAX6334UR20D3+T
- Part No.:
- MAX6334UR20D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6334UR20D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,917
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Product details
Overview
MAX6334UR20D3+T from Maxim Integrated is an ultra-low-voltage, open-drain microprocessor supervisory circuit in SOT23-3 package, monitoring 1.8V–3.3V power rails with factory-trimmed 2.00V reset threshold and 100ms minimum reset timeout. It asserts active-low RESET during VCC brownout and guarantees valid output down to VCC = 1.0V. Used in portable battery-powered equipment for reliable power-on reset and brownout protection.
For engineers reviewing the MAX6334UR20D3+T datasheet, MAX6334UR20D3+T pinout, MAX6334UR20D3+T application, or MAX6334UR20D3+T equivalent, key selection criteria include open-drain output compatibility with bidirectional μP reset pins, guaranteed operation at 1.0V VCC, 2.00V precision threshold tolerance (±3% over -40°C to +125°C), and 100ms reset timeout stability across temperature.
Technical Context
The MAX6334UR20D3+T implements a dedicated voltage-monitoring comparator with hysteresis and a fixed internal timer for reset assertion timing. Its open-drain RESET output requires an external pull-up resistor and supports wired-OR configurations with microcontrollers having bidirectional reset pins like the Motorola 68HC11.
Reset threshold is factory-trimmed to 2.00V (±1.8% at +25°C, ±3% over full temperature range) and remains stable against fast VCC transients up to 24µs at 10V/ms slew rate. The device operates from 1.0V to 5.5V supply and draws only 3.3µA typical supply current at 2.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.00V ±1.8% at +25°C; ±3% over -40°C to +125°C - ensures precise brownout detection for 1.8V/2.5V systems |
| Reset Timeout Period | 100ms minimum - provides sufficient hold time for μP initialization after power recovery |
| Supply Voltage Range | 1.0V to 5.5V - enables operation during deep brownout while maintaining reset validity |
| Supply Current | 3.3µA typical at 2.5V - minimizes quiescent load in battery-critical applications |
| RESET Output Type | Open-drain active-low - allows direct interface with bidirectional μP reset pins and wired-OR reset buses |
| VCC Falling Propagation Delay | 24µs at 10V/ms - rejects short negative transients without false triggering |
| Operating Temperature | -40°C to +125°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
MAX6334UR20D3+T is housed in a RoHS-compliant 3-pin SOT23-3 package (outline 21-0051), with 0.95mm pitch and 2.9mm × 1.6mm footprint. Pin 1 = GND, Pin 2 = RESET (open-drain), Pin 3 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output stage; must be low-impedance connection to system ground plane |
| 2 (RESET) | Active-low open-drain output | Drives low during reset; requires external pull-up to define high state; compatible with bidirectional μP reset pins |
| 3 (VCC) | Power supply input | Monitored rail input; supplies internal circuitry; valid from 1.0V to 5.5V; supports brownout detection down to 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Open-drain RESET output | Enables shared reset bus with multiple controllers and seamless interfacing to bidirectional μP reset pins (e.g., Motorola 68HC11) |
| Factory-trimmed 2.00V threshold | Eliminates external resistor networks and calibration; supports 1.8V core logic monitoring with ±3% accuracy over full temperature range |
| 100ms minimum reset timeout | Guarantees μP reset hold time exceeds boot ROM execution latency in embedded controllers and intelligent instruments |
| 1.0V minimum operating voltage | Maintains valid reset assertion during severe brownout conditions where VCC drops below 1.2V but remains above 1.0V |
| 3.3µA typical supply current | Extends battery life in portable equipment by minimizing standby current draw without sacrificing reset reliability |
Applications
| Portable/Battery-Powered Equipment | Intelligent Instruments |
|---|---|
Use Scenario: Handheld data loggers powered by single-cell Li-ion batteries experiencing voltage sag during peak transmit bursts. IC Role / Device Role / Timing Role: Monitors VCC and asserts RESET if voltage falls below 2.00V, holding reset for ≥100ms to prevent corrupted firmware execution. Use Value: Prevents system lockup during transient brownout by guaranteeing reset validity down to VCC = 1.0V and rejecting sub-24µs glitches. |
Use Scenario: Benchtop multimeters with ARM-based controllers requiring deterministic boot sequence after AC/DC adapter disconnect. IC Role / Device Role / Timing Role: Generates clean power-on reset pulse synchronized to VCC ramp-up, with 100ms timeout ensuring complete ADC and display controller initialization. Use Value: Eliminates need for RC-based reset circuits, reducing BOM count and improving temperature stability of reset timing. |
| Critical μP/μC Power Monitoring | Controllers |
Use Scenario: Industrial PLC I/O modules where undervoltage on 2.5V FPGA configuration rail must trigger immediate processor halt. IC Role / Device Role / Timing Role: Dedicated supervisor asserting open-drain RESET to FPGA and microcontroller simultaneously via shared pull-up. Use Value: Open-drain output enables safe wired-OR reset arbitration between multiple devices without contention. |
Use Scenario: HVAC zone controllers using 1.8V microcontrollers powered from switching regulators prone to startup overshoot and dropout. IC Role / Device Role / Timing Role: Detects both power-up ramp failure and brownout events on 1.8V rail, initiating controlled shutdown before memory corruption. Use Value: 2.00V threshold precisely matches 1.8V system margin; ±3% tolerance ensures consistent trip point across temperature extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6334UR20D2+T | Same 2.00V threshold and open-drain output, but 20ms minimum reset timeout instead of 100ms | Suitable for faster-booting μPs with shorter initialization sequences | Select when system boot completes within 20ms and longer timeout risks unnecessary delay |
| MAX6327UT20D3+T | Pin-compatible SOT23-3 supervisor with 2.0V threshold and push/pull active-low RESET; 100ms timeout; operates down to 0.7V | Requires no pull-up resistor; not suitable for wired-OR or bidirectional reset interfaces | Choose when board layout lacks space for pull-up or when driving high-capacitance reset lines directly |
Compared with MAX6334UR20D2+T, the MAX6334UR20D3+T provides extended reset hold time critical for complex firmware initialization; compared with MAX6327UT20D3+T, it trades push/pull drive strength for open-drain flexibility in multi-device reset arbitration.
Availability
MAX6334UR20D3+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, intelligent instruments, and critical μP/μC power monitoring requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX6334UR20D3+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 and mixed-signal ICs for industrial, automotive, and computing applications, emphasizing high reliability and low-power operation.
The MAX633x family delivers ultra-low-voltage supervisory circuits optimized for 1.8V–3.3V digital systems, targeting space-constrained and battery-sensitive applications where precision reset timing and minimal quiescent current are essential.
FAQ
What is the reset threshold voltage of the MAX6334UR20D3+T?
The MAX6334UR20D3+T has a factory-trimmed reset threshold of 2.00V, with ±1.8% tolerance at +25°C and ±3% over the full operating temperature range (-40°C to +125°C). This value is confirmed in Table 1 of the official datasheet and applies specifically to the "UR20" suffix variant of the MAX6334UR20D3+T.
Does the MAX6334UR20D3+T require an external pull-up resistor on the RESET pin?
Yes, the MAX6334UR20D3+T features an open-drain active-low RESET output and requires an external pull-up resistor to define the high state. Typical values range from 10kΩ to 100kΩ, selected based on bus capacitance and rise-time requirements. This design enables wired-OR reset configurations and compatibility with bidirectional microcontroller reset pins.
What is the minimum supply voltage at which the MAX6334UR20D3+T guarantees valid reset operation?
The MAX6334UR20D3+T guarantees correct reset assertion and deassertion down to VCC = 1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. This differs from the MAX6332/MAX6333 variants, which guarantee operation down to 0.7V. Below 1.0V, the MAX6334UR20D3+T may not maintain valid output states.
How long is the reset timeout period for the MAX6334UR20D3+T?
The MAX6334UR20D3+T provides a minimum reset timeout period of 100ms after VCC rises above the 2.00V threshold. This value is fixed and factory-programmed, indicated by the "D3" suffix in the part number. The actual timeout may extend up to 200ms depending on process and temperature variation, as documented in the Electrical Characteristics table.
Is the MAX6334UR20D3+T RoHS-compliant and lead-free?
Yes, the "+T" suffix in MAX6334UR20D3+T explicitly denotes lead-free, RoHS-compliant packaging. The device uses matte-tin plating and conforms to JEDEC J-STD-020 reflow profiles for lead-free soldering (peak temperature +260°C). This designation replaces the legacy "-T" leaded version and is verified in the Ordering Information section of the datasheet.
MAX6334UR20D3+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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6334UR20D3+T FAQ
1.How can I place an order for MAX6334UR20D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6334UR20D3+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 MAX6334UR20D3+T reliable?
The price and inventory of MAX6334UR20D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6334UR20D3+T is usually 5 days.
3.What payment methods are accepted for MAX6334UR20D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6334UR20D3+T transactions.
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4.How is shipping managed for MAX6334UR20D3+T?
MAX6334UR20D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6334UR20D3+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 MAX6334UR20D3+T?
For technical support, including MAX6334UR20D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6334UR20D3+T requirements.
6.How does Aetrix verify that MAX6334UR20D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6334UR20D3+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 MAX6334UR20D3+T meets industry standards.
7.What is the process for return or replacement of MAX6334UR20D3+T?
All MAX6334UR20D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6334UR20D3+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 MAX6334UR20D3+T part is unused and in its original packaging.
Return procedure for MAX6334UR20D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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