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Analog Devices Inc./Maxim Integrated MAX6334UR24D1
- Part No.:
- MAX6334UR24D1
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6334UR24D1.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,332
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Product details
Overview
MAX6334UR24D1 from Maxim Integrated is an ultra-low-voltage, open-drain microprocessor reset supervisor IC designed for 1.8V–3.3V digital systems. It asserts an active-low RESET signal when VCC falls below 2.40V (±1.8% at +25°C), maintains reset for ≥20ms after VCC recovers, draws only 3.3µA at 2.5V, and operates down to 1.0V supply-enabling reliable power monitoring in battery-powered controllers and portable instrumentation.
For engineers reviewing the MAX6334UR24D1 datasheet, MAX6334UR24D1 pinout, MAX6334UR24D1 application, or MAX6334UR24D1 equivalent, key selection factors include its factory-trimmed 2.40V reset threshold, 20ms minimum timeout, open-drain output for bidirectional µP reset interfacing (e.g., Motorola 68HC11), guaranteed operation to VCC = 1.0V, and SOT23-3 package compatibility with MAX809/MAX810 and MAX6326 series.
Technical Context
The MAX6334UR24D1 implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below its 2.40V threshold, rejecting transients up to 24µs (at 10V/ms slew rate). Its internal timer generates a fixed 20ms minimum reset pulse width after VCC recovery, independent of external components.
As an open-drain supervisor, it requires an external pull-up resistor for RESET assertion and supports wired-OR configurations with microcontrollers having bidirectional reset pins. Unlike push/pull variants (MAX6332/MAX6333), it does not guarantee RESET validity below VCC = 1.0V due to reduced sink capability at ultra-low supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.40V ±1.8% at +25°C; ensures reliable brownout detection for 2.5V systems |
| Reset Timeout Period | 20ms minimum; guarantees sufficient processor initialization time after power recovery |
| Supply Current | 3.3µA typical at VCC = 2.5V; enables multi-year battery life in portable equipment |
| Operating Supply Range | 1.0V to 5.5V; supports operation during deep brownout while maintaining reset state |
| Output Type | Open-drain active-low RESET; allows direct interface to bidirectional µP reset pins with single pull-up |
| Reset Propagation Delay | 24µs max at 10V/ms VCC fall rate; rejects short power glitches without false triggering |
| Package | SOT23-3; 2.92mm × 1.3mm footprint ideal for space-constrained PCB layouts |
Pinout & Package
SOT23-3 package with gull-wing leads, 1.9mm pitch, 1.3mm body width, and thermal pad omitted. RoHS-compliant lead-free option available as MAX6334UR24D1+T.
| 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) | Open-drain reset output | Active-low signal requiring external pull-up; sinks current only when asserted; floats high when deasserted |
| 3 (VCC) | Power supply input | Monitored supply rail; powers internal circuitry and defines reset threshold reference; operates from 1.0V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.40V with ±1.8% tolerance at +25°C enables precise 2.5V rail monitoring without calibration |
| Ultra-low quiescent current | 3.3µA at 2.5V reduces standby power in always-on battery systems by >95% vs. discrete solutions |
| Transient immunity | Rejects VCC glitches ≤24µs at 10V/ms, preventing spurious resets in noisy automotive or industrial environments |
| Open-drain output architecture | Enables direct connection to µPs with bidirectional reset pins (e.g., 68HC11) using one external pull-up resistor |
| Guaranteed operation to 1.0V | Maintains correct reset state during severe brownout conditions where VCC drops below 1.8V |
Applications
| Portable Medical Monitors | Automotive Body Control Modules |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter operating from single Li-ion cell (2.7–4.2V) with deep discharge protection. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET during brownout to prevent corrupted memory writes or unstable MCU execution. Use Value: 3.3µA supply current extends battery life beyond 5 years in sleep mode; 1.0V operational floor ensures reset remains valid until battery reaches end-of-life voltage. | Use Scenario: Low-voltage subsystem in vehicle door module powered from 12V regulator (3.3V output) subject to load-dump transients. IC Role / Device Role / Timing Role: Reset generator immune to 24µs negative VCC spikes, ensuring MCU restarts only on genuine power failure-not noise. Use Value: Factory-trimmed 2.40V threshold matches 3.3V rail tolerance; open-drain output interfaces directly with Infineon AURIX™ bidirectional reset pins. |
| Industrial PLC I/O Subsystems | Smart Energy Meters |
Use Scenario: Remote sensor node with isolated 2.5V logic rail powered from DC-DC converter with variable input. IC Role / Device Role / Timing Role: Precision reset monitor detecting undervoltage on 2.5V domain before FPGA configuration completes. Use Value: ±1.8% threshold accuracy eliminates need for external trimming resistors; 20ms timeout satisfies Xilinx Spartan-6 FPGA power-on requirements. | Use Scenario: Meter with dual-supply design (3.3V MCU + 1.8V metrology ASIC) requiring coordinated reset sequencing. IC Role / Device Role / Timing Role: Primary supervisor for 3.3V rail, with open-drain output enabling shared reset bus across multiple voltage domains. Use Value: SOT23-3 footprint saves >1.5mm² vs. SO-8 alternatives; pin compatibility with MAX809 simplifies legacy design migration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD1-T | 2.43V reset threshold (±2.5%), 140ms timeout, push/pull output, operates to 0.9V | Lacks open-drain flexibility; requires redesign for bidirectional µP reset interfaces | Select when fixed long timeout and push/pull drive are acceptable, and board layout allows different pinout |
| TPS3808G12DBVR | 1.2V supply min, 2.42V threshold (±0.5%), adjustable timeout via capacitor, push/pull output | Requires external timing capacitor; higher BOM count and larger footprint than fixed-timer MAX6334UR24D1 | Choose when tighter threshold tolerance or programmable timeout justifies added component and layout complexity |
Compared with MAX809TRD1-T and TPS3808G12DBVR, the MAX6334UR24D1 delivers optimal trade-off for space-constrained, battery-operated systems requiring open-drain reset signaling, ultra-low current, and guaranteed 1.0V operation-without external timing components or layout changes.
Availability
MAX6334UR24D1 is available at Aetrix Electronics and suitable for portable medical monitors, automotive body control modules, industrial PLC I/O subsystems, smart energy meters, and critical µP power monitoring requiring stable component supply across extended temperature ranges (-40°C to +125°C).
Supply support for MAX6334UR24D1 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 industrial, automotive, communications, and computing applications.
The MAX633x family targets ultra-low-power microprocessor supervision in space- and energy-constrained systems, emphasizing factory-trimmed accuracy, minimal external components, and robust transient immunity.
FAQ
What is the exact reset threshold voltage of MAX6334UR24D1 and how tightly is it specified?
The MAX6334UR24D1 has a factory-trimmed reset threshold of 2.40V with ±1.8% tolerance at +25°C and ±3% over full temperature range (-40°C to +125°C). This specification is guaranteed per Electrical Characteristics table and enables precise monitoring of 2.5V rails without external calibration. The "UR24" suffix explicitly denotes the 2.40V threshold variant within the MAX6334 family.
Does MAX6334UR24D1 support operation below 1.8V, and what is its minimum functional supply voltage?
Yes, the MAX6334UR24D1 is guaranteed to maintain correct reset state down to VCC = 1.0V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This allows reliable brownout detection in deeply discharged battery scenarios where other supervisors fail. Operation below 1.0V is not specified, and RESET validity is not assured below this level.
What is the purpose of the open-drain output in MAX6334UR24D1, and which microcontrollers benefit most?
The open-drain output in MAX6334UR24D1 enables wired-OR reset bus configurations and direct interfacing with microcontrollers featuring bidirectional reset pins-such as the Motorola 68HC11-using only a single external pull-up resistor. This eliminates level-shifting or additional logic, simplifying design and improving noise immunity in multi-master reset systems.
How does the 20ms reset timeout of MAX6334UR24D1 compare to other variants in the MAX633x family?
The "D1" suffix in MAX6334UR24D1 specifies a nominal 20ms minimum reset timeout period, distinct from D2 (100ms) and D3 (100ms) variants. This 20ms duration satisfies fast-starting MCUs like ARM Cortex-M0+ while avoiding unnecessary delays in responsive systems. All timeouts are factory-programmed and require no external components.
Is MAX6334UR24D1 pin-compatible with industry-standard reset supervisors like MAX809?
Yes, the MAX6334UR24D1 is explicitly stated as pin-compatible with MAX809/MAX810 and MAX6326/MAX6327/MAX6328 in the Features section. All share identical SOT23-3 pinout (GND, RESET, VCC), enabling drop-in replacement in existing layouts-provided the open-drain output is accommodated with a pull-up resistor.
MAX6334UR24D1 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:
- 2.4V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6334UR24D1 FAQ
1.How can I place an order for MAX6334UR24D1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6334UR24D1 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 MAX6334UR24D1 reliable?
The price and inventory of MAX6334UR24D1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6334UR24D1 is usually 5 days.
3.What payment methods are accepted for MAX6334UR24D1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6334UR24D1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6334UR24D1?
MAX6334UR24D1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6334UR24D1 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 MAX6334UR24D1?
For technical support, including MAX6334UR24D1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6334UR24D1 requirements.
6.How does Aetrix verify that MAX6334UR24D1 is sourced from the original manufacturer or authorized distributors?
All MAX6334UR24D1 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 MAX6334UR24D1 meets industry standards.
7.What is the process for return or replacement of MAX6334UR24D1?
All MAX6334UR24D1 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6334UR24D1, 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 MAX6334UR24D1 part is unused and in its original packaging.
Return procedure for MAX6334UR24D1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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