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Analog Devices Inc./Maxim Integrated MAX6334UR18D3+T
- Part No.:
- MAX6334UR18D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6334UR18D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,525
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Product details
Overview
The MAX6334UR18D3+T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit designed for 1.8V power supply monitoring in space-constrained embedded systems. It asserts reset when VCC falls below 1.80V (±1.8% at +25°C), maintains reset for ≥100ms after VCC recovers, draws only 3.0–6.0µA at 1.8V, and operates down to VCC = 1.0V over –40°C to +125°C - enabling reliable brownout detection in battery-powered controllers.
For engineers reviewing the MAX6334UR18D3+T datasheet, MAX6334UR18D3+T pinout, MAX6334UR18D3+T application, or MAX6334UR18D3+T equivalent, this device is selected for ultra-low-voltage reset supervision where open-drain output compatibility with bidirectional μP reset pins (e.g., Motorola 68HC11), transient immunity, and SOT23-3 footprint are critical design requirements.
Technical Context
The MAX6334UR18D3+T implements a factory-trimmed bandgap-based voltage comparator with hysteresis to detect VCC drops below its 1.80V threshold. Its internal timer generates a guaranteed minimum 100ms reset timeout after VCC rises above threshold, independent of supply ramp rate.
As an open-drain output device, it requires an external pull-up resistor and interfaces directly with microcontrollers having bidirectional reset inputs. Its reset assertion remains valid down to VCC = 1.0V - unlike push/pull variants - but does not guarantee RESET validity at VCC < 1.0V due to reduced sink capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.80V ±1.8% at +25°C; ±3% over –40°C to +125°C - ensures precise 1.8V rail supervision without external calibration. |
| Reset Timeout Period | ≥100ms (min) - guarantees sufficient processor initialization time after power recovery. |
| Supply Current | 3.0–6.0µA at VCC = 1.8V - enables multi-year operation in coin-cell–powered portable instruments. |
| Operating VCC Range | 1.0V to 5.5V - supports supervision during deep brownout and full-system voltage range. |
| Output Type | Open-drain active-low - allows wired-OR reset bus sharing and direct interface with bidirectional μP reset pins. |
| Reset Propagation Delay | 24µs (VCC falling at 10V/ms) - provides fast response to rapid supply collapse. |
| Temperature Range | –40°C to +125°C - qualified for automotive under-hood and industrial control environments. |
Pinout & Package
MAX6334UR18D3+T is housed in a RoHS-compliant 3-pin SOT23-3 package (outline 21-0051), with 0.95mm pitch, 1.3mm × 2.9mm footprint, and thermal pad omitted - optimized for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for reset comparator and output stage; must be low-impedance connection to system ground plane. |
| 2 | RESET | Open-drain active-low output; requires external pull-up resistor (typically 10kΩ–100kΩ) to VCC or another logic rail. |
| 3 | VCC | Power supply input (1.0V–5.5V); powers internal comparator, timer, and output FET - no decoupling capacitor required due to ultra-low ICC. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 1.80V threshold | Eliminates need for external resistive divider or trimming components - reduces BOM count and layout area. |
| 100ms minimum reset timeout | Ensures μP completes internal boot sequence before release, even with slow VCC ramp rates. |
| 1.0V minimum operating voltage | Enables reset assertion during severe brownout conditions where push/pull variants (0.7V min) may fail to hold state. |
| Open-drain output architecture | Permits shared reset bus with multiple supervisors or μPs; supports level-shifting via pull-up to non-VCC rail. |
| Transient immunity up to 24µs | Rejects short negative VCC glitches (e.g., switching noise) without false resets - improves system robustness. |
Applications
| Industrial Controllers | Portable Medical Instruments |
|---|---|
Use Scenario: PLC I/O modules powered by 1.8V LDOs in harsh electrical environments with frequent line transients. IC Role / Device Role / Timing Role: Supervises 1.8V core supply and asserts open-drain RESET to ARM Cortex-M4 microcontroller during brownout. Use Value: Prevents firmware corruption by ensuring reset persists ≥100ms after VCC recovers - matching processor boot timing requirements. |
Use Scenario: Handheld glucose meters using coin-cell batteries where supply voltage sags below 1.8V during peak current draw. IC Role / Device Role / Timing Role: Monitors 1.8V rail and forces system reset before analog front-end ADC misreads due to undervoltage. Use Value: Ultra-low 3.0µA supply current extends battery life beyond 2 years while maintaining accurate 1.80V threshold tolerance. |
| Automotive Body Control Modules | Smart Sensor Nodes |
Use Scenario: Under-dash BCMs exposed to –40°C cold cranking and +125°C engine bay temperatures. IC Role / Device Role / Timing Role: Provides temperature-stable reset supervision for 1.8V MCU domain across full automotive grade range. Use Value: ±3% threshold variation over –40°C to +125°C eliminates need for derating or guard-banding in safety-critical reset paths. |
Use Scenario: Wireless IoT sensor nodes with intermittent wake-up cycles and strict energy budgeting. IC Role / Device Role / Timing Role: Acts as primary power-on and brownout detector for ultra-low-power RISC-V SoC with bidirectional reset pin. Use Value: Open-drain output enables direct connection to SoC's shared reset bus without level translators or additional logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6333UR18D3+T | Push/pull active-low RESET output; operates down to 0.7V VCC; identical threshold and timeout. | Requires no pull-up resistor; unsuitable for wired-OR reset buses or bidirectional μP pins. | Select when board-level reset signal must drive multiple loads directly without external components. |
| TLV809K33DBZR | Fixed 3.08V reset threshold; SOT23-3; 140ms timeout; 0.9V min VCC; push/pull output. | Not suitable for 1.8V rail supervision; incompatible threshold and output structure. | Consider only if redesigning for higher-voltage rails and simpler push/pull drive is acceptable. |
Compared with MAX6334UR18D3+T, the MAX6333UR18D3+T offers lower minimum VCC (0.7V vs. 1.0V) but lacks open-drain flexibility, while TLV809K33DBZR serves different voltage domains entirely - making MAX6334UR18D3+T uniquely suited for 1.8V open-drain reset applications requiring guaranteed 1.0V operation.
Availability
MAX6334UR18D3+T is available at Aetrix Electronics and suitable for industrial controllers, portable medical instruments, automotive body control modules, and smart sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6334UR18D3+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 MAX6332/MAX6333/MAX6334 family delivers ultra-low-voltage, low-power reset supervision for 1.8V–3.3V microprocessor systems - prioritizing accuracy, small footprint, and robustness in brownout-prone environments.
FAQ
What is the exact reset threshold voltage of the MAX6334UR18D3+T?
The MAX6334UR18D3+T has a factory-trimmed nominal reset threshold of 1.80V, with ±1.8% tolerance at +25°C and ±3% over the full –40°C to +125°C operating range. This value is confirmed in Table 1 of the official datasheet and applies specifically to the "UR18" suffix variant of the MAX6334UR18D3+T.
Does the MAX6334UR18D3+T require an external pull-up resistor on the RESET pin?
Yes, the MAX6334UR18D3+T features an open-drain active-low RESET output and requires an external pull-up resistor - typically 10kΩ to 100kΩ - connected between the RESET pin and the target logic rail (e.g., VCC or another compatible voltage). This is mandatory for proper logic-level translation and bus sharing, as specified in the Applications Information section of the MAX6334UR18D3+T datasheet.
What is the minimum supply voltage at which the MAX6334UR18D3+T guarantees correct reset behavior?
The MAX6334UR18D3+T guarantees correct reset assertion and timeout behavior down to VCC = 1.0V over the full –40°C to +125°C temperature range. This differs from the MAX6332/MAX6333 variants (0.7V min) and is explicitly stated in the Absolute Maximum Ratings and Electrical Characteristics tables for the MAX6334UR18D3+T.
Can the MAX6334UR18D3+T be used with microcontrollers that have bidirectional reset pins?
Yes, the MAX6334UR18D3+T is specifically designed for interfacing with microcontrollers having bidirectional reset pins - such as the Motorola 68HC11 - due to its open-drain output. The datasheet confirms this capability in the Applications Information section, showing direct connection with a single pull-up resistor enabling either the supervisor or μP to assert reset on the shared line.
What is the guaranteed minimum reset timeout period for the MAX6334UR18D3+T?
The MAX6334UR18D3+T guarantees a minimum reset timeout period of 100ms after VCC rises above the 1.80V threshold. This value is fixed by the "D3" suffix in the part number and is validated across temperature and supply voltage per the Electrical Characteristics table, ensuring reliable processor initialization timing.
MAX6334UR18D3+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:
- 1.8V
- 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
MAX6334UR18D3+T FAQ
1.How can I place an order for MAX6334UR18D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6334UR18D3+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 MAX6334UR18D3+T reliable?
The price and inventory of MAX6334UR18D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6334UR18D3+T is usually 5 days.
3.What payment methods are accepted for MAX6334UR18D3+T?
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MAX6334UR18D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6334UR18D3+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 MAX6334UR18D3+T?
For technical support, including MAX6334UR18D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6334UR18D3+T requirements.
6.How does Aetrix verify that MAX6334UR18D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6334UR18D3+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 MAX6334UR18D3+T meets industry standards.
7.What is the process for return or replacement of MAX6334UR18D3+T?
All MAX6334UR18D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6334UR18D3+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 MAX6334UR18D3+T part is unused and in its original packaging.
Return procedure for MAX6334UR18D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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