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Analog Devices Inc./Maxim Integrated MAX6333UR22D3+T
- Part No.:
- MAX6333UR22D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6333UR22D3+T.pdf
- Description:
- IC MPU/RESET CIRC 2.20V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,229
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Product details
Overview
MAX6333UR22D3+T from Maxim Integrated is a push/pull active-low microprocessor supervisory circuit in SOT23-3 package, monitoring 1.8V–3.3V power rails with factory-trimmed 2.20V reset threshold (±1.8% at +25°C, ±3% over –40°C to +125°C), 100ms minimum reset timeout, and guaranteed operation down to VCC = 0.7V. It delivers ultra-low 3.3µA supply current at 2.5V and interfaces directly with Pentium II, controllers, and battery-powered μP systems requiring reliable brownout detection.
For engineers reviewing the MAX6333UR22D3+T datasheet, MAX6333UR22D3+T pinout, MAX6333UR22D3+T application, or MAX6333UR22D3+T equivalent, key selection criteria include its 2.2V threshold accuracy across temperature, 100ms reset pulse width, push/pull output drive capability (VOH ≥ 0.8×VCC, VOL ≤ 0.3V at 500µA), and SOT23-3 footprint compatibility with MAX809/MAX6326 families.
Technical Context
The MAX6333UR22D3+T implements a precision bandgap-based reset comparator with factory-trimmed 2.20V threshold and built-in hysteresis to reject fast VCC transients up to 24µs at 10V/ms slew rate. Its internal timing circuit generates a fixed 100ms minimum reset timeout after VCC rises above threshold, with normalized timeout variation <±25% over –40°C to +125°C.
This device operates as a single-function supervisor: it asserts active-low RESET only when VCC falls below 2.20V (with ±3% tolerance over full temperature range) and holds RESET asserted for ≥100ms after VCC recovers, ensuring deterministic μP initialization during power-up, brownout, and power-down sequences without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.20V ±1.8% at +25°C; ±3% over –40°C to +125°C - ensures accurate brownout detection for 2.2V nominal rails |
| Reset Timeout Period | 100ms minimum - guarantees sufficient hold time for μP boot sequence completion |
| Supply Voltage Range | 0.7V to 5.5V - supports operation during deep brownout and enables use with 1.8V/2.5V/3.3V systems |
| Supply Current | 3.3µA typical at 2.5V - minimizes quiescent load on battery or low-power rails |
| Output Type | Push/pull active-low RESET - drives high/low without external pull-up; VOH ≥ 0.8×VCC, VOL ≤ 0.3V at 500µA |
| Operating Temperature | –40°C to +125°C - qualified for automotive and industrial embedded environments |
| VCC Propagation Delay | 24µs max at 10V/ms VCC fall rate - rejects short-duration supply glitches |
Pinout & Package
MAX6333UR22D3+T is housed in a RoHS-compliant 3-pin SOT23-3 package (outline 21-0051, land pattern 90-0179), with 1.3mm × 2.9mm footprint and 0.95mm height. Pin 1 is GND, Pin 2 is RESET (active-low push/pull output), and Pin 3 is VCC - matching industry-standard pinout for drop-in replacement of MAX809/MAX6326 series.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output stage; must be connected to system ground plane |
| 2 (RESET) | Active-low reset output | Drives low during VCC undervoltage and for ≥100ms after recovery; sinks ≥500µA at VOL ≤ 0.3V |
| 3 (VCC) | Supply input | Power source for internal circuitry; accepts 0.7V–5.5V; monitors own voltage for reset assertion |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.20V threshold | Eliminates external resistor network; achieves ±1.8% accuracy at room temperature without calibration |
| 100ms minimum reset timeout | Guarantees μP reset hold time exceeds typical boot ROM execution duration in embedded controllers |
| 0.7V minimum operating voltage | Ensures valid RESET assertion even during severe brownout conditions where VCC drops near silicon threshold |
| 3.3µA supply current at 2.5V | Reduces battery drain in portable equipment; enables >10-year shelf life in coin-cell–powered IoT sensors |
| Transient immunity (24µs at 10V/ms) | Prevents false resets from ESD-induced or switching regulator noise on VCC rail |
Applications
| Pentium® II Computers | Industrial Controllers |
|---|---|
Use Scenario: Power-on and brownout supervision for Intel Pentium II mainboard VRM and chipset sequencing. IC Role / Device Role / Timing Role: Primary reset generator asserting active-low RESET to CPU and southbridge during VCC ramp-up and sag. Use Value: Guarantees deterministic CPU initialization by holding RESET ≥100ms after 2.2V rail stabilizes, preventing boot failures under marginal AC line conditions. |
Use Scenario: Reliable reset conditioning for ARM Cortex-M4-based PLC I/O modules operating in harsh factory environments. IC Role / Device Role / Timing Role: Standalone supervisor monitoring 2.5V logic rail; provides glitch-immune reset signal to microcontroller reset pin. Use Value: Maintains valid RESET down to 0.7V VCC and rejects transients up to 24µs, eliminating spurious reboots caused by motor drive noise coupling onto power rails. |
| Portable Medical Sensors | Battery-Powered Data Loggers |
Use Scenario: Low-power reset management for wearable ECG sensor nodes powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Ultra-low-current (3.3µA) supervisor detecting 2.2V battery depletion threshold before shutdown. Use Value: Extends usable battery life by minimizing quiescent draw while ensuring clean reset assertion before brownout-induced data corruption. |
Use Scenario: Robust power monitoring for environmental data loggers deployed in remote locations with intermittent solar charging. IC Role / Device Role / Timing Role: Reset circuit for MSP430F5xx MCU, asserting RESET during solar panel output sags below 2.2V. Use Value: Factory-trimmed 2.20V threshold eliminates calibration drift over 10-year field deployment; 100ms timeout prevents premature wake-up during transient cloud cover events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3+T | 2.32V reset threshold (±2.5%), 240ms timeout, same SOT23-3 pinout | Higher threshold better suited for 2.5V systems; longer timeout accommodates slower-booting μPs | Select when system requires tighter 2.32V trip point and extended reset hold time beyond 100ms |
| MAX6326UR22D3+T | Same 2.20V threshold and 100ms timeout, but rated for –40°C to +85°C only | Limited temperature range excludes automotive under-hood or industrial high-temp deployments | Choose for cost-sensitive commercial-grade applications where full –40°C to +125°C qualification is unnecessary |
Compared with MAX6333UR22D3+T, MAX809TRD3+T offers higher threshold and longer timeout at the expense of reduced accuracy, while MAX6326UR22D3+T matches electrical specs but sacrifices extended temperature coverage - making MAX6333UR22D3+T optimal for high-reliability 2.2V-rail supervision across extreme environments.
Availability
MAX6333UR22D3+T is available at Aetrix Electronics and suitable for Pentium II computers, industrial controllers, and portable medical sensors requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX6333UR22D3+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, with expertise in power management and supervisory circuits.
The MAX633x family delivers ultra-low-voltage, low-power μP reset solutions optimized for space-constrained, battery-operated, and high-temperature embedded systems requiring deterministic power-on reset behavior.
FAQ
What is the exact reset threshold voltage of MAX6333UR22D3+T and how does it vary with temperature?
The MAX6333UR22D3+T has a factory-trimmed nominal reset threshold of 2.20V, with ±1.8% tolerance at +25°C and ±3% tolerance over the full –40°C to +125°C operating range. This means the actual trip point falls between 2.13V and 2.27V at temperature extremes, ensuring robust brownout detection for 2.2V nominal rails without external calibration.
Does MAX6333UR22D3+T support operation below 1.0V supply voltage?
Yes, MAX6333UR22D3+T is guaranteed to operate correctly down to VCC = 0.7V, maintaining valid RESET assertion and release behavior. This capability enables reliable reset generation during deep brownout conditions common in battery-powered systems approaching end-of-life, where supply voltage may dip below 1.0V.
What is the minimum reset timeout period specified for MAX6333UR22D3+T?
The MAX6333UR22D3+T provides a minimum reset timeout period of 100ms after VCC rises above the 2.20V threshold. This fixed delay is internally generated and guaranteed over –40°C to +125°C, ensuring sufficient hold time for μP boot ROM execution and peripheral initialization in demanding embedded applications.
How does the push/pull output of MAX6333UR22D3+T differ from open-drain alternatives like MAX6334UR22D3+T?
The MAX6333UR22D3+T features a push/pull active-low RESET output capable of both sourcing and sinking current, eliminating the need for an external pull-up resistor. In contrast, MAX6334UR22D3+T uses an open-drain output requiring a pull-up, making MAX6333UR22D3+T preferable for space-constrained designs and applications where board-level component count must be minimized.
Is MAX6333UR22D3+T pin-compatible with legacy supervisors such as MAX809?
Yes, MAX6333UR22D3+T uses the standard SOT23-3 pinout (GND, RESET, VCC) and is explicitly documented as pin-compatible with MAX809/MAX810 and MAX6326/MAX6327/MAX6328 families. This allows direct replacement without PCB layout changes, simplifying design upgrades and second-source qualification.
MAX6333UR22D3+T 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:
- 2.2V
- Output:
- Push-Pull, Totem Pole
- 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
MAX6333UR22D3+T FAQ
1.How can I place an order for MAX6333UR22D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6333UR22D3+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 MAX6333UR22D3+T reliable?
The price and inventory of MAX6333UR22D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6333UR22D3+T is usually 5 days.
3.What payment methods are accepted for MAX6333UR22D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6333UR22D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6333UR22D3+T?
MAX6333UR22D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6333UR22D3+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 MAX6333UR22D3+T?
For technical support, including MAX6333UR22D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6333UR22D3+T requirements.
6.How does Aetrix verify that MAX6333UR22D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6333UR22D3+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 MAX6333UR22D3+T meets industry standards.
7.What is the process for return or replacement of MAX6333UR22D3+T?
All MAX6333UR22D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6333UR22D3+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 MAX6333UR22D3+T part is unused and in its original packaging.
Return procedure for MAX6333UR22D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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