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Analog Devices Inc./Maxim Integrated MAX6334UR16D3
- Part No.:
- MAX6334UR16D3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6334UR16D3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,878
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Product details
Overview
The MAX6334UR16D3 from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit in a 3-pin SOT23 package, designed to monitor 1.6V power rails with ±3% threshold accuracy over -40°C to +125°C and assert reset for ≥100ms after VCC recovery. It operates down to 1.0V supply voltage, draws only 3.0–6.0µA at 1.8V, and delivers 0.4V max RESET low voltage at 50µA sink current - used in battery-powered controllers and portable instrumentation requiring reliable brownout detection.
For engineers reviewing the MAX6334UR16D3 datasheet, MAX6334UR16D3 pinout, MAX6334UR16D3 application, or MAX6334UR16D3 equivalent, key selection criteria include its 1.60V factory-trimmed reset threshold, 100ms minimum timeout, open-drain output architecture for bidirectional μP reset pin interfacing, guaranteed operation to VCC = 1.0V, and SOT23-3 footprint compatibility with MAX809/MAX6326 families.
Technical Context
This device implements a precision bandgap-based reset comparator with factory-trimmed threshold (1.60V ±1.8% at +25°C, ±3% over full temperature range) and a fixed internal timer generating ≥100ms reset pulse width after VCC exceeds VTH. Its open-drain RESET output requires an external pull-up resistor and supports wired-OR configurations with microcontroller bidirectional reset pins.
The IC ignores fast transients on VCC - up to 24µs duration for 10mV overdrive - and maintains functional reset assertion state down to VCC = 1.0V, unlike push/pull variants that operate to 0.7V. No external components are needed beyond the pull-up resistor, enabling minimal BOM count in space-constrained embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.60V ±1.8% at +25°C; ±3% over -40°C to +125°C - ensures accurate 1.6V rail monitoring without calibration |
| Reset Timeout Period | ≥100ms - guarantees sufficient processor initialization time after power recovery |
| Supply Voltage Range | 1.0V to 5.5V - supports ultra-low-voltage operation down to 1.0V while maintaining valid RESET state |
| Supply Current | 3.0–6.0µA at VCC = 1.8V - enables multi-year battery life in portable equipment |
| RESET Output Type | Open-drain, active-low - allows wired-OR with other reset sources and interfaces to bidirectional μP reset pins |
| RESET Low Voltage | ≤0.4V at ISINK = 50µA, VCC ≥ 1.0V - ensures solid logic-low assertion even at minimum supply |
| Operating Temperature | -40°C to +125°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
MAX6334UR16D3 is housed in a RoHS-compliant 3-pin SOT23 package (outline 21-0051), with 1.3mm × 2.9mm footprint and 0.95mm height - compatible with standard SOT23 pick-and-place and reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for reset 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 to VCC or another logic rail |
| 3 | VCC | Power supply input (1.0V–5.5V); powers internal comparator, timer, and output driver |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 1.60V threshold | Eliminates need for external resistor divider or trimming during production test |
| 100ms minimum reset timeout | Meets boot-time requirements of ARM Cortex-M and 8-bit microcontrollers without external timing components |
| Open-drain output architecture | Enables direct interface to Motorola 68HC11 and other μPs with bidirectional reset pins via single pull-up |
| 1.0V minimum operating voltage | Ensures deterministic reset behavior during deep brownout conditions where VCC drops below 1.2V |
| Transient immunity (24µs @ 10mV) | Rejects common switching noise on power rails without false triggering |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose meters and pulse oximeters operating from single-cell Li-ion (2.7–4.2V) or coin-cell (1.5–3.0V) supplies. IC Role / Device Role / Timing Role: Monitors main supply rail and asserts reset if voltage sags below 1.60V during RF transmission or sensor excitation pulses. Use Value: Prevents firmware corruption during brownout by holding µC in reset until stable 1.6V+ rail is restored for ≥100ms. |
Use Scenario: DIN-rail mounted programmable logic controller modules exposed to 24VDC field wiring with inductive kickback and EFT noise. IC Role / Device Role / Timing Role: Supervises 3.3V logic rail derived from isolated DC/DC converter; provides clean reset signal immune to 100ns–1µs transients. Use Value: Open-drain output allows shared reset bus across multiple µCs and FPGAs, reducing board-level reset coordination complexity. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: Under-hood BCMs powered from vehicle battery (9–16V) with LDO-regulated 3.3V domain subject to load-dump and cold-crank events. IC Role / Device Role / Timing Role: Detects 1.6V brownout on microcontroller core rail during cold-crank (battery dips to 6V), asserting reset until stable operation resumes. Use Value: Guaranteed function down to VCC = 1.0V ensures reset remains asserted through worst-case voltage sag, preventing erratic MCU behavior. |
Use Scenario: ANSI C12.20-certified electricity meters using ultra-low-power MSP430 or similar µC, operating from supercapacitor backup during AC loss. IC Role / Device Role / Timing Role: Monitors 1.8V or 1.6V backup rail generated from supercap; triggers 100ms reset to clear volatile registers before power failure. Use Value: 3.0µA typical supply current extends supercap hold-up time by >15%, supporting longer secure shutdown sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR16D3-T | Same 1.60V threshold, 100ms timeout, SOT23-3, but push/pull active-low output | Requires no pull-up resistor; not suitable for wired-OR or bidirectional reset pin use | Select when board layout lacks space for pull-up or when driving high-capacitance reset lines directly |
| TPS3123E16DBVR | 1.6V threshold, 200ms timeout, 1.2V min VCC, push/pull active-low, same SOT23-3 package | Higher minimum supply (1.2V vs. 1.0V); tighter threshold tolerance (±0.5% vs. ±3%) | Prefer when tighter threshold accuracy is required and VCC never falls below 1.2V in system operation |
Compared with MAX6334UR16D3, MAX6326UR16D3 eliminates the external pull-up but sacrifices bidirectional reset capability, while TPS3123E16DBVR improves threshold precision at the cost of reduced ultra-low-voltage robustness - making MAX6334UR16D3 optimal for battery-sag-critical and multi-source reset bus designs.
Availability
MAX6334UR16D3 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 with guaranteed long-term availability and full-temperature-range qualification.
Supply support for MAX6334UR16D3 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX633x family was engineered specifically for ultra-low-voltage microprocessor supervision in battery-constrained and harsh-environment applications - delivering precision reset functionality in minimal 3-pin SOT23 footprint with no external components.
FAQ
What is the exact reset threshold voltage of MAX6334UR16D3 and how tightly is it specified?
The MAX6334UR16D3 features a factory-trimmed reset threshold of 1.60V, with ±1.8% tolerance at +25°C and ±3% over the full -40°C to +125°C operating range. This specification is guaranteed per Electrical Characteristics table in the official datasheet, ensuring reliable 1.6V rail monitoring without external calibration or adjustment. The MAX6334UR16D3 achieves this via laser-trimmed internal resistors during wafer sort.
Does MAX6334UR16D3 require an external pull-up resistor, and what value is recommended?
Yes, MAX6334UR16D3 requires an external pull-up resistor on its open-drain RESET pin because it cannot drive high actively. A 10kΩ to 100kΩ resistor to the target logic rail (e.g., VCC or 3.3V) is typical; 47kΩ is commonly used to balance rise time and current draw. The MAX6334UR16D3 datasheet confirms this requirement in Applications Information section and Figure 1, noting compatibility with Motorola 68HC11 bidirectional reset interfaces.
What is the minimum supply voltage at which MAX6334UR16D3 guarantees correct reset assertion?
MAX6334UR16D3 is guaranteed to maintain correct reset assertion state down to VCC = 1.0V, as stated in the General Description and Absolute Maximum Ratings sections. This differs from the MAX6332/MAX6333 variants (guaranteed to 0.7V) and reflects the open-drain output architecture's lower minimum operating voltage. Below 1.0V, the MAX6334UR16D3 may not assert RESET reliably, and system design must ensure VCC stays ≥1.0V during brownout.
Can MAX6334UR16D3 be used in place of MAX809 or MAX6326 in existing designs?
MAX6334UR16D3 is pin-compatible with MAX809/MAX6326 in SOT23-3 footprint and shares identical pinout (GND, RESET, VCC), but its open-drain output differs from their push/pull structure. Therefore, MAX6334UR16D3 can replace them only if the design includes a pull-up resistor and does not rely on active-high drive capability. The MAX6334UR16D3 datasheet explicitly states "Pin-Compatible with MAX809/MAX810 and MAX6326/MAX6327/MAX6328" - confirming mechanical and connection compatibility.
What is the maximum transient duration that MAX6334UR16D3 can ignore without issuing a false reset?
MAX6334UR16D3 can ignore negative-going VCC transients up to 24µs in duration when the overdrive is 10mV, as verified in the Typical Operating Characteristics graph "Maximum Transient Duration vs. Reset Comparator Overdrive". This immunity is achieved via internal filtering and comparator hysteresis, allowing the MAX6334UR16D3 to reject common switching noise and EFT bursts without false triggering - critical in electrically noisy industrial environments.
MAX6334UR16D3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6334UR16D3 FAQ
1.How can I place an order for MAX6334UR16D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6334UR16D3 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 MAX6334UR16D3 reliable?
The price and inventory of MAX6334UR16D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6334UR16D3 is usually 5 days.
3.What payment methods are accepted for MAX6334UR16D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6334UR16D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6334UR16D3?
MAX6334UR16D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6334UR16D3 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 MAX6334UR16D3?
For technical support, including MAX6334UR16D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6334UR16D3 requirements.
6.How does Aetrix verify that MAX6334UR16D3 is sourced from the original manufacturer or authorized distributors?
All MAX6334UR16D3 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 MAX6334UR16D3 meets industry standards.
7.What is the process for return or replacement of MAX6334UR16D3?
All MAX6334UR16D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6334UR16D3, 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 MAX6334UR16D3 part is unused and in its original packaging.
Return procedure for MAX6334UR16D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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