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Analog Devices Inc./Maxim Integrated MAX6334UR22D3+T
- Part No.:
- MAX6334UR22D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6334UR22D3+T.pdf
- Description:
- IC MPU/RESET CIRC 2.20V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,486
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Product details
Overview
MAX6334UR22D3+T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit in a 3-pin SOT23 package, designed for reliable power-on reset generation in 1.8V–3.3V digital systems. It asserts RESET when VCC falls below 2.20V (±1.8% at +25°C, ±3% over –40°C to +125°C), maintains it for ≥100ms after VCC recovers, and operates down to VCC = 1.0V with 3.3µA supply current at 2.5V.
For engineers reviewing the MAX6334UR22D3+T datasheet, MAX6334UR22D3+T pinout, MAX6334UR22D3+T application, or MAX6334UR22D3+T equivalent, key selection criteria include open-drain output compatibility with bidirectional µP reset pins, guaranteed reset validity down to 1.0V (not 0.7V), factory-trimmed 2.2V threshold, 100ms timeout, and SOT23-3 footprint constraints.
Technical Context
The MAX6334UR22D3+T implements a precision voltage comparator with hysteresis-free threshold detection and a fixed internal timer for reset timeout. Its open-drain RESET output requires an external pull-up resistor and supports wired-OR configurations with microcontrollers having bidirectional reset pins (e.g., Motorola 68HC11).
Reset assertion is immune to fast VCC transients ≤24µs (at 10V/ms slew rate), and the device guarantees correct RESET/RESET state for VCC ≥1.0V across –40°C to +125°C. Threshold accuracy is ±1.8% at +25°C and ±3% over full temperature range.
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 - provides sufficient hold time for µP initialization and peripheral stabilization |
| Supply Voltage Range | 1.0V to 5.5V - enables operation in ultra-low-voltage systems where VCC may dip near 1.0V during startup |
| Supply Current | 3.3µA (typ) at VCC = 2.5V - minimizes quiescent power in battery-powered equipment |
| Output Type | Open-drain active-low RESET - allows shared reset bus and interface with bidirectional µP reset pins |
| VOL (RESET asserted) | ≤0.4V at ISINK = 50µA, VCC ≥1.0V - ensures solid logic-low level under light load |
| Operating Temperature | –40°C to +125°C - supports industrial and automotive under-hood applications |
Pinout & Package
MAX6334UR22D3+T is housed in a RoHS-compliant, lead-free 3-pin SOT23-3 package (outline 21-0051, land pattern 90-0179), with top-mark "FZCV".
| 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 to VCC or another logic rail; sinks current only when asserted |
| 3 | VCC | Power supply input (1.0V–5.5V); powers internal comparator and timer; decoupling capacitor recommended near pin |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.2V reset threshold | Eliminates external resistor networks and calibration; reduces BOM count and layout area in space-constrained SOT23 designs |
| 100ms minimum reset timeout | Guarantees µP core and peripherals complete power-up sequencing before release; avoids premature execution |
| Open-drain output architecture | Enables direct interfacing with µPs having bidirectional reset pins (e.g., 68HC11) without level-shifting or contention risk |
| 1.0V minimum operating voltage | Ensures deterministic reset behavior during deep brownout conditions where VCC drops below 1.8V but remains ≥1.0V |
| Transient immunity (≤24µs at 10V/ms) | Rejects short-duration power glitches without false resets, improving system robustness in noisy environments |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: Programmable logic controllers monitoring 2.2V FPGA configuration rails in harsh factory environments. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to halt FPGA boot until stable 2.2V supply is confirmed. Use Value: Prevents corrupted configuration loading by guaranteeing ≥100ms reset hold time and rejecting EMI-induced VCC transients up to 24µs. |
Use Scenario: Battery-powered glucose meters using low-power µC with bidirectional reset pin. IC Role / Device Role / Timing Role: Open-drain supervisor sharing reset line with µC to enable either device to initiate reset during low-battery shutdown. Use Value: Eliminates need for discrete logic or level shifters; 3.3µA ICC extends battery life while maintaining valid reset down to VCC = 1.0V. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: Under-hood BCMs powered from 2.2V LDOs supplying CAN transceivers and sensor interfaces. IC Role / Device Role / Timing Role: Reset generator ensuring µC remains held in reset during cold-crank voltage dips to 1.0V–1.5V. Use Value: Guaranteed operation at VCC = 1.0V and –40°C to +125°C rating prevent spurious resets during engine start. |
Use Scenario: DIN-rail mounted electricity meters with isolated µP and real-time clock requiring clean power-up sequencing. IC Role / Device Role / Timing Role: Precision 2.2V supervisor validating main 3.3V rail before releasing µP and RTC from reset. Use Value: ±3% threshold tolerance over temperature avoids false resets due to thermal drift; SOT23 footprint saves PCB area in dense meter modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6333UR22D3+T | Push/pull active-low RESET output; guaranteed valid down to VCC = 0.7V | Requires no external pull-up; suitable for systems where RESET must remain asserted below 1.0V | Select when deterministic reset assertion below 1.0V is required and shared reset bus is not needed |
| MAX6327UT22D3+T | Same 2.2V threshold and 100ms timeout, but push/pull output and wider supply range (0.9V–6.0V) | Valid down to 0.9V; higher sink/source drive (12mA vs. 500µA); not pin-compatible | Choose for higher drive strength or lower VCC operation; requires PCB redesign due to different pinout and package (SOT23-5) |
Compared with MAX6334UR22D3+T, the MAX6333UR22D3+T offers stronger reset assertion at ultra-low VCC but lacks open-drain flexibility, while the MAX6327UT22D3+T provides greater drive and lower VCC capability at the cost of pinout and package incompatibility.
Availability
MAX6334UR22D3+T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, automotive body control modules, and smart energy meters requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6334UR22D3+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.
The MAX633x family delivers ultra-low-voltage, low-power supervisory circuits targeting space-constrained, battery-sensitive, and thermally demanding embedded systems requiring precise, glitch-immune reset generation.
FAQ
What is the exact reset threshold voltage of MAX6334UR22D3+T and how does it vary with temperature?
The MAX6334UR22D3+T has a factory-trimmed nominal reset threshold of 2.20V at +25°C, with tolerance of ±1.8%. Over the full operating temperature range of –40°C to +125°C, the threshold shifts to ±3%, meaning the actual trip point stays within 2.13V to 2.27V. This tight specification ensures consistent brownout detection across environmental extremes without external calibration.
Does MAX6334UR22D3+T support operation below 1.8V, and what is its minimum functional VCC?
Yes, MAX6334UR22D3+T is fully specified down to VCC = 1.0V - unlike the MAX6332/MAX6333 variants which operate to 0.7V. Below 1.0V, the device cannot guarantee correct RESET state. This 1.0V minimum enables use in deep-brownout scenarios common in automotive cold-crank or battery-depleted portable systems, while maintaining reset integrity.
Why does MAX6334UR22D3+T use an open-drain output, and what external component is required?
MAX6334UR22D3+T uses an open-drain output to support wired-OR reset buses and seamless interfacing with microcontrollers that have bidirectional reset pins (e.g., Motorola 68HC11). An external pull-up resistor - typically 10kΩ to 100kΩ connected between RESET and VCC or another logic rail - is mandatory to establish a defined high state when the output is not actively sinking current.
What is the guaranteed reset timeout period for MAX6334UR22D3+T, and how is it implemented?
MAX6334UR22D3+T guarantees a minimum reset timeout period of 100ms after VCC rises above the 2.20V threshold. This timing is generated by an internal, temperature-compensated RC oscillator and is independent of external components. The 100ms duration ensures adequate hold time for modern µPs and peripherals to stabilize before program execution begins.
Is MAX6334UR22D3+T pin-compatible with other supervisory ICs, and which ones?
MAX6334UR22D3+T is pin-compatible with the entire MAX6332/MAX6333/MAX6334 family in the SOT23-3 package, including MAX6334UR23D3+T and MAX6334UR20D3+T. It is also pin-compatible with legacy MAX809/MAX810 and MAX6326/MAX6327/MAX6328 series, enabling drop-in replacement in existing designs without PCB modification.
MAX6334UR22D3+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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.2V
- 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
MAX6334UR22D3+T FAQ
1.How can I place an order for MAX6334UR22D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6334UR22D3+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 MAX6334UR22D3+T reliable?
The price and inventory of MAX6334UR22D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6334UR22D3+T is usually 5 days.
3.What payment methods are accepted for MAX6334UR22D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6334UR22D3+T transactions.
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4.How is shipping managed for MAX6334UR22D3+T?
MAX6334UR22D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6334UR22D3+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 MAX6334UR22D3+T?
For technical support, including MAX6334UR22D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6334UR22D3+T requirements.
6.How does Aetrix verify that MAX6334UR22D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6334UR22D3+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 MAX6334UR22D3+T meets industry standards.
7.What is the process for return or replacement of MAX6334UR22D3+T?
All MAX6334UR22D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6334UR22D3+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 MAX6334UR22D3+T part is unused and in its original packaging.
Return procedure for MAX6334UR22D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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