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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 SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,912
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Product details
Overview
MAX6334UR22D3-T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit designed for 1.8V–3.3V digital systems. It monitors VCC and asserts RESET when supply voltage falls below 2.20V (±1.8% at +25°C), maintaining reset for ≥100ms after VCC recovers; operates down to 1.0V VCC and draws only 3.3µA at 2.5V, enabling use in battery-powered instrumentation and embedded controllers.
For engineers reviewing the MAX6334UR22D3-T datasheet, MAX6334UR22D3-T pinout, MAX6334UR22D3-T application, or MAX6334UR22D3-T equivalent, key selection criteria include its 2.2V factory-trimmed reset threshold, 100ms minimum timeout, open-drain output for bidirectional μP reset interfaces, guaranteed operation to 1.0V VCC, and SOT23-3 package compatibility with MAX809/MAX6326 families.
Technical Context
The MAX6334UR22D3-T implements a precision bandgap-based reset comparator with factory-trimmed 2.20V threshold (±3% over –40°C to +125°C) and internal timer generating ≥100ms reset pulse width. Its open-drain RESET output requires an external pull-up and supports interfacing with bidirectional microcontroller reset pins such as those on Motorola 68HC11 derivatives.
Designed for ultra-low-voltage operation, the device remains functional with VCC as low as 1.0V (vs. 0.7V for push/pull variants), and features transient immunity-rejecting VCC glitches ≤24µs at 10V/ms slew rate. No external components are needed beyond the pull-up resistor.
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 reliable brownout detection for 2.2V nominal rails |
| Reset Timeout Period | ≥100ms - guarantees sufficient processor initialization time after power recovery |
| Supply Voltage Range | 1.0V to 5.5V - enables operation in deep-brownout conditions where push/pull variants fail |
| Supply Current | 3.3µA typical at 2.5V - minimizes quiescent drain in always-on battery monitoring circuits |
| RESET Output Type | Open-drain active-low - allows wired-OR reset bus sharing and direct interface with bidirectional μP reset pins |
| VCC Propagation Delay | 24µs max at 10V/ms VCC fall rate - rejects fast transients without false resets |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
MAX6334UR22D3-T is housed in a 3-pin SOT23-3 package (outline 21-0051), with 1.3mm × 0.8mm footprint and 0.95mm height. Pin 1 = GND, Pin 2 = RESET (open-drain), Pin 3 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for reset comparator and output stage; must be connected directly to system ground plane |
| 2 | RESET | Open-drain active-low output; requires external pull-up to VCC or another logic rail; sinks up to 500µA at VCC ≥1.8V |
| 3 | VCC | Power supply input; supplies internal regulator and comparator; accepts 1.0V–5.5V with full specification compliance |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.2V reset threshold | Eliminates external resistor divider and calibration effort for precise 2.2V rail monitoring |
| 100ms minimum reset timeout | Ensures full μP/μC boot sequence completion before release, even during slow VCC ramp-up |
| Open-drain RESET with 0.4V VOL @ 50µA | Enables shared reset buses and compatibility with legacy or multi-source reset architectures |
| 1.0V minimum operating VCC | Provides deterministic reset assertion down to deeper brownout levels than push/pull alternatives |
| 3.3µA supply current at 2.5V | Extends battery life in portable instruments and remote sensors without compromising supervision integrity |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: PLC I/O modules powered from 2.2V LDOs in harsh EMI environments with frequent line dips. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to ARM Cortex-M4 microcontrollers during brownout events. Use Value: Guarantees clean restart after 2.2V rail collapse with ≥100ms hold time, preventing firmware corruption. |
Use Scenario: Handheld glucose meters using coin-cell batteries with steep discharge curves crossing 2.2V threshold. IC Role / Device Role / Timing Role: Low-current reset supervisor enabling safe shutdown and cold-start reset sequencing. Use Value: Draws only 3.3µA at 2.5V while maintaining valid reset assertion down to 1.0V VCC, maximizing usable battery capacity. |
| Automotive Body Control Modules | Smart Sensor Nodes |
Use Scenario: Under-dash BCMs exposed to load-dump transients and cold-cranking voltage sags. IC Role / Device Role / Timing Role: Immune reset monitor rejecting <24µs negative VCC glitches while asserting RESET on sustained sags. Use Value: Prevents spurious resets during engine cranking, ensuring uninterrupted CAN communication and actuator control. |
Use Scenario: Wireless temperature nodes powered by energy harvesters with intermittent 2.2V output. IC Role / Device Role / Timing Role: Open-drain RESET output pulled up to MCU's IO rail, enabling bidirectional reset arbitration. Use Value: Supports shared reset signaling between harvester management IC and sensor MCU without level-shifting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6327UT22D3-T | Push/pull active-low RESET; operates down to 0.7V VCC; same 2.2V threshold and 100ms timeout | Requires no external pull-up; unsuitable for wired-OR or bidirectional reset buses | Select when board layout prohibits external resistors and reset bus sharing is unnecessary |
| TPS3808G22DBVR | Push/pull active-low RESET; 2.2V threshold; 100ms timeout; 2.5µA ICC; operates down to 0.8V VCC | Lacks open-drain flexibility; different pinout (SOT23-5); higher accuracy (±0.5% vs ±1.8%) | Select when tighter threshold tolerance is required and PCB redesign accommodates 5-pin footprint |
Compared with MAX6334UR22D3-T, MAX6327UT22D3-T offers lower minimum VCC but forfeits open-drain versatility, while TPS3808G22DBVR delivers superior threshold accuracy at the cost of pin count and architectural flexibility-making MAX6334UR22D3-T optimal for space-constrained, multi-device reset bus designs.
Availability
MAX6334UR22D3-T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, automotive body control modules, and smart sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
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 analog, mixed-signal, and high-reliability ICs for industrial, automotive, and computing applications.
The MAX633x family was designed specifically for ultra-low-voltage, low-power microprocessor reset supervision in space- and current-constrained embedded systems, with emphasis on factory-trimmed thresholds and robust transient immunity.
FAQ
What is the exact reset threshold voltage of the MAX6334UR22D3-T?
The MAX6334UR22D3-T has a factory-trimmed nominal reset threshold of 2.20V, with tolerance of ±1.8% at +25°C and ±3% over the full –40°C to +125°C operating range. This value is laser-trimmed during production and verified per Electrical Characteristics table in the official datasheet.
Does the MAX6334UR22D3-T require an external pull-up resistor on the RESET pin?
Yes, the MAX6334UR22D3-T features an open-drain RESET output and requires an external pull-up resistor to a valid logic rail (typically VCC or another compatible voltage). The datasheet recommends values from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements.
What is the minimum supply voltage at which the MAX6334UR22D3-T guarantees correct reset behavior?
The MAX6334UR22D3-T guarantees correct RESET/RESET output state down to VCC = 1.0V, unlike the MAX6332/MAX6333 variants which guarantee operation to 0.7V. Below 1.0V, reset assertion is not assured, and the device may enter undefined behavior.
Can the MAX6334UR22D3-T replace the MAX809 in an existing design?
The MAX6334UR22D3-T is pin-compatible with the MAX809 in SOT23-3 packaging and shares identical pinout (GND, RESET, VCC), but differs in output structure: MAX809 uses push/pull, while MAX6334UR22D3-T uses open-drain. A pull-up resistor must be added if replacing MAX809, and timing validation is required.
What is the maximum VCC slew rate the MAX6334UR22D3-T can tolerate without issuing a false reset?
The MAX6334UR22D3-T tolerates VCC falling at up to 10V/ms without false reset assertion, with propagation delay specified at 24µs under that condition. Its reset comparator is designed to reject transients shorter than 24µs, as confirmed in the "Maximum Transient Duration vs. Reset Comparator Overdrive" graph.
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:
- Obsolete
- 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?
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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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