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Analog Devices Inc./Maxim Integrated MAX6333UR23D2
- Part No.:
- MAX6333UR23D2
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6333UR23D2.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,066
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Product details
Overview
MAX6333UR23D2 from Maxim Integrated is a push/pull active-low microprocessor supervisory circuit in SOT23-3 package, monitoring 1.8V–3.3V power supplies with factory-trimmed 2.30V reset threshold (±1.8% at +25°C, ±3% over -40°C to +125°C), 20ms minimum reset timeout, and guaranteed operation down to VCC = 0.7V. It ensures reliable power-on/brownout reset for embedded controllers and battery-powered instrumentation.
For engineers reviewing the MAX6333UR23D2 datasheet, MAX6333UR23D2 pinout, MAX6333UR23D2 application, or MAX6333UR23D2 equivalent, key selection criteria include its ultra-low 3.3µA supply current at 1.8V, 0.4V RESET output low voltage at 50µA sink, immunity to sub-24µs VCC transients, and compatibility with space-constrained portable designs requiring stable reset assertion during voltage ramp-up and dropout.
Technical Context
The MAX6333UR23D2 implements a precision bandgap-based reset comparator with factory-trimmed 2.30V threshold and hysteresis optimized for 1.8V/2.5V system rails. Its internal timer generates a fixed 20ms minimum reset pulse width after VCC rises above threshold, independent of supply slew rate.
Designed for direct interface with microcontroller reset inputs, the push/pull output drives low actively and high actively without external pull-up, supporting bidirectional reset control only when paired with open-drain devices like MAX6334. The circuit remains functional down to 0.7V VCC, ensuring valid reset state during deep brownout conditions.
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 detection of 2.3V rail collapse without false triggering |
| Reset Timeout Period | 20ms minimum - guarantees sufficient processor initialization time after power stabilization |
| Supply Current | 3.3µA typical at VCC = 1.8V - enables multi-year battery life in always-on portable systems |
| VCC Operating Range | 0.7V to 5.5V - supports operation through deep undervoltage events and wide-input industrial supplies |
| RESET Output Low Voltage | 0.4V max at ISINK = 50µA, VCC ≥ 1.0V - guarantees solid logic-low assertion even at near-threshold supply |
| Propagation Delay | 24µs max on VCC falling edge at 10V/ms - rejects fast glitches while responding promptly to true brownouts |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
MAX6333UR23D2 is housed in a 3-pin SOT23-3 package (outline 21-0051, land pattern 90-0179), with 1.3mm × 2.9mm footprint and 0.95mm height - compatible with high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for reset comparator and output driver; must be low-impedance connection to system ground plane |
| 2 | RESET | Active-low push/pull output; asserts low during VCC < 2.30V and holds low for ≥20ms after VCC recovery - directly drives CMOS reset inputs without pull-up |
| 3 | VCC | Power supply input; accepts 0.7V–5.5V; powers internal comparator, timer, and output stage - no external decoupling required due to ultra-low ICC |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.30V reset threshold | Eliminates external resistor networks and calibration steps for precise 2.3V rail monitoring |
| 20ms minimum reset timeout | Meets JEDEC JESD78 reliability requirements for microprocessor initialization timing |
| 0.7V minimum operating voltage | Ensures deterministic reset behavior during severe brownout, preventing undefined MCU states |
| 3.3µA supply current at 1.8V | Reduces quiescent power by >90% versus legacy reset ICs, critical for coin-cell applications |
| Transient immunity to 24µs glitches | Rejects ESD-induced supply noise without requiring additional RC filtering on VCC |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose meters and pulse oximeters operating from single Li-ion or alkaline cells with dynamic load-induced voltage sags. IC Role / Device Role / Timing Role: Supervises main 1.8V logic rail and asserts reset if voltage drops below 2.30V during sensor activation or RF transmission. Use Value: Prevents firmware corruption during brownout by guaranteeing ≥20ms reset hold time while consuming only 3.3µA - extending battery life beyond 5 years. |
Use Scenario: DIN-rail mounted programmable logic controller modules exposed to 24V DC field supply fluctuations and EMI. IC Role / Device Role / Timing Role: Monitors isolated 3.3V auxiliary supply powering FPGA configuration memory and communication interfaces. Use Value: Immunity to 24µs transients eliminates need for TVS diodes on 3.3V rail, reducing BOM cost and board area in safety-critical control loops. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: Under-hood BCMs subjected to cold-crank (4.5V) and load-dump (40V) events affecting 3.3V LDO outputs. IC Role / Device Role / Timing Role: Resets microcontroller when 3.3V domain falls below 2.30V during cranking, with guaranteed function down to 0.7V VCC. Use Value: Maintains deterministic reset assertion across full automotive temperature range (-40°C to +125°C), meeting AEC-Q100 Grade 1 requirements. |
Use Scenario: ANSI C12.20-certified electricity meters with dual-supply architecture (mains + backup battery) and strict power-loss logging. IC Role / Device Role / Timing Role: Triggers nonvolatile memory write and safe shutdown when 1.8V RTC supply dips below 2.30V during mains failure. Use Value: 20ms timeout aligns with EEPROM write cycle timing; 3.3µA ICC minimizes battery drain during 10-year backup operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6327UT23D2-T | Same 2.30V threshold and 20ms timeout, but open-drain output requiring external pull-up resistor | Limited to systems with bidirectional reset pins or where wired-OR reset bus is required | Select MAX6327UT23D2-T only when interfacing with MCUs like Motorola 68HC11 that require open-drain reset signaling |
| TPS3123-23DBVR | 2.32V threshold (±0.5%), 200ms timeout, 1.6µA ICC at 1.8V, but minimum VCC = 0.9V (not 0.7V) | Suitable for higher-reliability applications needing tighter threshold tolerance, but not for deep-brownout scenarios | Choose TPS3123-23DBVR when absolute threshold accuracy outweighs ultra-low-voltage operation capability |
Compared with MAX6333UR23D2, MAX6327UT23D2-T requires external pull-up and lacks guaranteed 0.7V operation, while TPS3123-23DBVR offers superior threshold accuracy but sacrifices brownout resilience below 0.9V - making MAX6333UR23D2 optimal for battery-powered systems demanding both precision and deep-undervoltage coverage.
Availability
MAX6333UR23D2 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, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6333UR23D2 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 communications markets, with expertise in power management and sensor signal conditioning.
The MAX633x family delivers ultra-low-power, high-accuracy reset supervision for battery-operated and harsh-environment systems - targeting applications where supply integrity directly impacts functional safety and data reliability.
FAQ
What is the exact reset threshold voltage and tolerance for MAX6333UR23D2?
The MAX6333UR23D2 has a factory-trimmed nominal reset threshold of 2.30V, with ±1.8% tolerance at +25°C and ±3% over the full -40°C to +125°C operating range. This specification ensures consistent detection of 2.3V rail collapse across temperature and process variation without external calibration.
Does MAX6333UR23D2 support operation below 1.0V VCC, and why does this matter?
Yes, MAX6333UR23D2 is guaranteed to operate down to VCC = 0.7V, unlike many competing supervisors limited to 0.9V or higher. This capability ensures deterministic reset assertion during deep brownout events common in battery-powered systems nearing end-of-life, preventing MCU lockup or corrupted memory writes.
What is the reset timeout period of MAX6333UR23D2, and how is it implemented?
The MAX6333UR23D2 provides a minimum reset timeout period of 20ms, generated by an internal precision timer that begins counting when VCC rises above the 2.30V threshold. This fixed delay meets JEDEC JESD78 requirements for microprocessor initialization and eliminates need for external RC timing components.
How does the push/pull output of MAX6333UR23D2 differ from open-drain alternatives?
The MAX6333UR23D2 features a push/pull active-low RESET output that actively drives both high and low states, eliminating the need for an external pull-up resistor. This reduces component count, improves noise immunity on the reset line, and ensures faster rise/fall times compared to open-drain variants like MAX6334UR23D2.
Is MAX6333UR23D2 pin-compatible with legacy Maxim reset ICs?
Yes, MAX6333UR23D2 is pin-compatible with MAX809/MAX810 and MAX6326/MAX6327/MAX6328 in the SOT23-3 package. Pin 1 is GND, Pin 2 is RESET, and Pin 3 is VCC - enabling drop-in replacement in existing designs without PCB layout changes, provided the reset threshold and timeout requirements match.
MAX6333UR23D2 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:
- 2.3V
- Output:
- Push-Pull, Totem Pole
- 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
MAX6333UR23D2 FAQ
1.How can I place an order for MAX6333UR23D2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6333UR23D2 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 MAX6333UR23D2 reliable?
The price and inventory of MAX6333UR23D2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6333UR23D2 is usually 5 days.
3.What payment methods are accepted for MAX6333UR23D2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6333UR23D2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6333UR23D2?
MAX6333UR23D2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6333UR23D2 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 MAX6333UR23D2?
For technical support, including MAX6333UR23D2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6333UR23D2 requirements.
6.How does Aetrix verify that MAX6333UR23D2 is sourced from the original manufacturer or authorized distributors?
All MAX6333UR23D2 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 MAX6333UR23D2 meets industry standards.
7.What is the process for return or replacement of MAX6333UR23D2?
All MAX6333UR23D2 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6333UR23D2, 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 MAX6333UR23D2 part is unused and in its original packaging.
Return procedure for MAX6333UR23D2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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