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Analog Devices Inc./Maxim Integrated MAX6334UR23D3-T
- Part No.:
- MAX6334UR23D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6334UR23D3-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,084
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Product details
Overview
The MAX6334UR23D3-T from Maxim Integrated is an ultra-low-voltage, open-drain microprocessor supervisory circuit in a 3-pin SOT23 package. It monitors 1.8V–3.3V power supplies, asserts an active-low reset when VCC falls below 2.30V (±1.8% at +25°C), and maintains reset for ≥100ms after VCC recovers-enabling reliable power-on/brownout reset in space-constrained portable systems.
For engineers reviewing the MAX6334UR23D3-T datasheet, MAX6334UR23D3-T pinout, MAX6334UR23D3-T application, or MAX6334UR23D3-T equivalent, key selection criteria include its 1.0V minimum operating voltage, 3.3µA supply current, open-drain output for bidirectional μP reset interfaces, and factory-trimmed 2.30V threshold with ±3% tolerance over –40°C to +125°C.
Technical Context
This device implements a precision bandgap-based reset comparator with transient immunity-rejecting VCC glitches ≤24µs at 10V/ms slew rate. Its open-drain RESET output requires an external pull-up and supports interfacing with bidirectional microcontroller reset pins (e.g., Motorola 68HC11) without level-shifting.
The reset timeout period is factory-programmed to ≥100ms (min), fully specified across –40°C to +125°C, and exhibits <±5% normalized variation over temperature. The comparator's threshold is trimmed to 2.30V at +25°C with ±1.8% initial accuracy and ±3% total variation over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.30V ±1.8% at +25°C; ±3% over –40°C to +125°C - ensures accurate brownout detection for 2.3V nominal rails |
| Minimum Operating Voltage | 1.0V - guarantees valid reset assertion down to ultralow battery levels in portable equipment |
| Supply Current | 3.3µA typical at 1.8V - enables multi-year operation on coin-cell batteries |
| Reset Timeout Period | ≥100ms - meets JEDEC JESD78 reliability requirements for processor initialization |
| Output Type | Open-drain RESET - allows wired-OR configuration and direct interface with bidirectional μP reset pins |
| VCC Transient Immunity | Rejects negative-going transients ≤24µs at 10V/ms - prevents false resets during switching noise |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
Supplied in a RoHS-compliant 3-pin SOT23 package (outline 21-0051, land pattern 90-0179), with 1.3mm × 0.8mm footprint and 0.95mm height - optimized for high-density PCB layouts.
| 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 resistor (typically 10kΩ–100kΩ) to VCC or another logic rail |
| 3 (VCC) | Power supply input | Accepts 1.0V–5.5V; powers internal circuitry and defines reset threshold reference point |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.30V threshold | Eliminates external resistor divider and calibration, reducing BOM count and board area by >30% vs discrete solutions |
| 100ms minimum reset timeout | Ensures sufficient hold time for complex processors (e.g., ARM Cortex-M, RISC-V SoCs) to complete internal initialization |
| Open-drain output architecture | Enables shared reset bus with multiple supervisors or μPs, supporting system-level reset arbitration without additional logic |
| 3.3µA supply current at 1.8V | Extends battery life in always-on IoT sensors and wearables beyond 5 years on CR2032 cells |
| –40°C to +125°C operation | Validates functionality in automotive engine control units and industrial motor drives without derating |
Applications
| Portable Medical Sensors | Automotive Body Control Modules |
|---|---|
Use Scenario: Wearable ECG patch monitoring heart rhythm continuously on coin-cell power. IC Role / Device Role / Timing Role: Supervises 1.8V LDO output powering the analog front-end and BLE SoC; asserts reset if battery sags below 2.3V. Use Value: Prevents corrupted sensor data capture during low-battery brownout, ensuring clinical-grade signal integrity. |
Use Scenario: Central body controller managing door locks, lighting, and HVAC in passenger compartment. IC Role / Device Role / Timing Role: Monitors 3.3V domain supplying microcontroller and CAN transceivers; holds reset until stable post-ignition. Use Value: Guarantees deterministic boot sequence despite load-dump transients on vehicle battery rail. |
| Industrial PLC I/O Modules | Smart Energy Meters |
Use Scenario: DIN-rail mounted I/O module acquiring analog inputs in factory automation. IC Role / Device Role / Timing Role: Resets ARM-based controller upon 24V-to-3.3V DC/DC converter undervoltage during line disturbance. Use Value: Avoids spurious digital output toggling that could trigger unsafe actuator motion during power anomaly. |
Use Scenario: Revenue-grade meter with metrology SoC and secure bootloader. IC Role / Device Role / Timing Role: Provides 100ms reset pulse to ensure flash memory controller completes write-cycle before firmware execution. Use Value: Eliminates risk of corrupted firmware update or lost energy logging due to premature processor release. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6328TRD3-T | Same 3-pin SOT23, open-drain, 100ms timeout, but 2.63V reset threshold (not 2.30V); higher VCC min = 1.2V | Designed for 2.5V/3.3V systems with tighter margin above 2.6V rail; less suitable for 1.8V/2.3V domains | Select only if system VCC nominal is ≥2.6V and 2.30V threshold is not required |
| TPS3123E18DBVR | Open-drain, 2.32V threshold (±0.5%), 200ms timeout, 1.0V min VCC, but 6µA ICC - double the quiescent current | Higher accuracy threshold but longer timeout and higher power; no guaranteed operation below 1.2V per TI datasheet | Prefer when ±0.5% threshold tolerance is critical and 100ms is insufficient; accept higher current penalty |
Compared with MAX6334UR23D3-T, MAX6328TRD3-T offers higher reset voltage unsuitable for 2.3V rails, while TPS3123E18DBVR trades 3.3µA efficiency for tighter threshold tolerance and longer timeout-making MAX6334UR23D3-T optimal for cost-sensitive, ultra-low-power 2.3V monitoring.
Availability
MAX6334UR23D3-T is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, and industrial PLC I/O modules requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6334UR23D3-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 power, sensing, and connectivity in demanding environments.
The MAX633x family delivers ultra-low-voltage, low-power supervisory circuits targeting battery-powered and automotive applications where reliability, small size, and minimal quiescent current are critical.
FAQ
What is the exact reset threshold voltage of the MAX6334UR23D3-T?
The MAX6334UR23D3-T has a factory-trimmed reset threshold of 2.30V at +25°C, with ±1.8% initial tolerance and ±3% total variation across –40°C to +125°C. This value is confirmed in Table 1 of the official datasheet and applies specifically to the "UR23" suffix variant of the MAX6334UR__D3-T series.
Does the MAX6334UR23D3-T support operation below 1.8V supply?
Yes, the MAX6334UR23D3-T operates down to 1.0V VCC, guaranteeing correct reset assertion and deassertion behavior at this minimum voltage. Its 2.30V threshold remains valid even as VCC approaches 1.0V, enabling use in deeply discharged battery scenarios where other supervisors fail.
Why does the MAX6334UR23D3-T use an open-drain output instead of push-pull?
The MAX6334UR23D3-T uses an open-drain output to enable wired-OR reset bus configurations and direct interfacing with microcontrollers having bidirectional reset pins (e.g., Motorola 68HC11). This eliminates level-shifting components and supports multi-source reset arbitration-unlike push-pull variants such as MAX6332UR23D3-T.
What is the maximum transient duration the MAX6334UR23D3-T can ignore on VCC?
The MAX6334UR23D3-T rejects negative-going VCC transients up to 24µs in duration when the slew rate is 10V/ms, as specified in the Electrical Characteristics table. This immunity prevents false resets caused by switching noise or load-dump events in noisy power environments.
Is the MAX6334UR23D3-T pin-compatible with older Maxim supervisors like MAX809?
Yes, the MAX6334UR23D3-T is pin-compatible with MAX809/MAX810 and MAX6326/MAX6327/MAX6328 in the 3-pin SOT23 package. Pin 1 = GND, Pin 2 = RESET (open-drain), Pin 3 = VCC - allowing drop-in replacement where open-drain output and 2.30V threshold meet design requirements.
MAX6334UR23D3-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:
- 2.3V
- 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
MAX6334UR23D3-T FAQ
1.How can I place an order for MAX6334UR23D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6334UR23D3-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 MAX6334UR23D3-T reliable?
The price and inventory of MAX6334UR23D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6334UR23D3-T is usually 5 days.
3.What payment methods are accepted for MAX6334UR23D3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6334UR23D3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6334UR23D3-T?
MAX6334UR23D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6334UR23D3-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 MAX6334UR23D3-T?
For technical support, including MAX6334UR23D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6334UR23D3-T requirements.
6.How does Aetrix verify that MAX6334UR23D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6334UR23D3-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 MAX6334UR23D3-T meets industry standards.
7.What is the process for return or replacement of MAX6334UR23D3-T?
All MAX6334UR23D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6334UR23D3-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 MAX6334UR23D3-T part is unused and in its original packaging.
Return procedure for MAX6334UR23D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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