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Analog Devices Inc./Maxim Integrated MAX6332UR18D3+T
- Part No.:
- MAX6332UR18D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6332UR18D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,539
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Product details
Overview
MAX6332UR18D3+T from Maxim Integrated is an ultra-low-voltage, push/pull active-high microprocessor supervisory circuit in SOT23-3 package. It monitors 1.8V power supplies, asserts a high-level RESET signal when VCC falls below 1.80V (±1.8% at +25°C), maintains reset for ≥100ms after VCC recovers, and operates down to 0.7V supply - enabling reliable brownout detection in battery-powered controllers and portable instrumentation.
For engineers reviewing the MAX6332UR18D3+T datasheet, MAX6332UR18D3+T pinout, MAX6332UR18D3+T application, or MAX6332UR18D3+T equivalent, key selection criteria include guaranteed active-high RESET output down to VCC = 0.7V, factory-trimmed 1.80V threshold with ±3% tolerance over –40°C to +125°C, 100ms minimum timeout, 3.3μA typical supply current at 1.8V, and SOT23-3 footprint compatibility with MAX809/MAX6326 families.
Technical Context
The MAX6332UR18D3+T implements a precision bandgap-based voltage comparator with hysteresis and a temperature-compensated timeout timer. Its reset assertion logic is fully static: RESET remains high during VCC undervoltage and for the full 100ms timeout after VCC exceeds 1.80V, independent of external RC components.
Designed for single-supply systems, it features transient-immune reset detection (rejects <24µs glitches at 100mV overdrive), guaranteed valid RESET/RESET states down to VCC = 0.7V, and rail-to-rail output drive capability - sourcing up to 200µA at 0.8×VCC and sinking up to 1.2mA while maintaining VOL ≤0.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.80V ±1.8% at +25°C; ±3% over –40°C to +125°C - ensures accurate 1.8V supply monitoring across industrial temperature range |
| Reset Timeout Period | ≥100ms - guarantees sufficient processor initialization time after power recovery |
| Supply Voltage Range | 0.7V to 5.5V - supports operation during deep brownout and compatibility with 1.8V/2.5V/3.3V systems |
| Supply Current | 3.3µA typical at 1.8V - enables multi-year battery life in always-on monitoring applications |
| Output Type | Push/pull active-high RESET - eliminates need for external pull-up resistor and simplifies interface to µP reset inputs requiring high-active assertion |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| Package | SOT23-3 - 2.92mm × 1.3mm footprint compatible with space-constrained portable designs |
Pinout & Package
SOT23-3 package with gull-wing leads, 1.3mm pitch, and exposed pad not connected. RoHS-compliant lead-free construction (indicated by "+T" suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be low-impedance connection to system ground plane |
| 2 | RESET | Active-high push/pull reset output; drives high during VCC fault and 100ms timeout, low otherwise - directly interfaces to µP reset input without external components |
| 3 | VCC | Power supply input; powers internal circuitry and defines reset threshold reference - accepts 0.7V–5.5V with guaranteed functionality down to 0.7V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 1.80V threshold | Eliminates external resistor network and calibration effort; ±1.8% accuracy at room temperature ensures precise 1.8V rail supervision |
| 100ms minimum reset timeout | Guarantees full microcontroller initialization before release - no external timing capacitor required |
| 0.7V minimum operating voltage | Enables valid reset assertion during deep brownout conditions where other supervisors fail - critical for battery backup integrity |
| 3.3µA supply current at 1.8V | Reduces quiescent power in always-on monitoring circuits - extends battery life in portable medical and sensor devices |
| Transient immunity | Rejects VCC glitches <24µs wide at 100mV amplitude - prevents false resets in electrically noisy industrial environments |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
Use Scenario: Real-time monitoring of 1.8V FPGA configuration voltage in programmable logic controllers subject to 24V field wiring transients. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to halt FPGA operation during undervoltage and hold reset for ≥100ms post-recovery. Use Value: Prevents partial configuration and metastability by ensuring FPGA remains held in reset until stable 1.8V rail is confirmed - no external timing components needed. |
Use Scenario: Power sequencing in handheld ECG devices powered by single-cell Li-ion batteries discharging from 4.2V to 2.8V. IC Role / Device Role / Timing Role: Monitoring 1.8V analog front-end supply and generating clean, glitch-immune reset pulse to ARM Cortex-M0 MCU. Use Value: Guarantees MCU reset validity down to 0.7V VCC - enabling safe shutdown and data retention even as battery voltage collapses near end-of-life. |
| Automotive Body Control Modules | Smart Sensor Nodes |
Use Scenario: Supervision of 1.8V CAN transceiver I/O supply in body electronics modules exposed to load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: Active-high RESET generator with –40°C to +125°C operation, asserting reset during cold-crank brownout and holding for 100ms after recovery. Use Value: Ensures deterministic restart of microcontroller and CAN peripheral after voltage sag - eliminating firmware lockup due to marginal supply conditions. |
Use Scenario: Low-power wireless sensor node using 1.8V ultra-low-power MCU and MEMS accelerometer, powered by coin cell. IC Role / Device Role / Timing Role: Primary supervisor for 1.8V rail, providing active-high reset with 3.3µA quiescent current and 100ms timeout. Use Value: Enables >5-year battery life while guaranteeing reliable wake-from-reset behavior - no external pull-up or timing components required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR18D3+T | Same 1.80V threshold and 100ms timeout, but open-drain active-low output - requires external pull-up resistor. | Compatible only with µPs accepting active-low reset; cannot directly replace active-high interface without circuit modification. | Select when interfacing with bidirectional reset pins (e.g., Motorola 68HC11) or when wired-OR reset bus architecture is required. |
| MAX809TRD3+T | 1.65V reset threshold, 240ms timeout, same SOT23-3 package and push/pull active-low output - not pin-compatible due to different pin 2 function (RESET vs RESET). | Requires PCB layout change; suitable only for systems tolerant of lower threshold and longer timeout. | Choose only if 1.65V monitoring and 240ms hold time align with system requirements - not a drop-in replacement for MAX6332UR18D3+T. |
Compared with MAX6326UR18D3+T and MAX809TRD3+T, the MAX6332UR18D3+T uniquely provides factory-trimmed 1.80V detection with active-high push/pull output in pin-identical SOT23-3 packaging - eliminating external components and enabling direct integration into 1.8V µP reset chains without level-shifting or pull-up design overhead.
Availability
MAX6332UR18D3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, smart sensor nodes, and battery-powered instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6332UR18D3+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 computing applications.
The MAX6332 family delivers ultra-low-voltage microprocessor supervision with factory-trimmed thresholds and fixed timeouts - designed specifically for space-constrained, battery-sensitive systems requiring guaranteed reset validity down to 0.7V.
FAQ
What is the exact reset threshold voltage for MAX6332UR18D3+T and how does it vary with temperature?
The MAX6332UR18D3+T has a nominal reset threshold of 1.80V at +25°C, with ±1.8% tolerance. Over the full –40°C to +125°C operating range, the threshold varies between 1.75V and 1.85V (±3% of nominal). This tight specification ensures reliable 1.8V supply monitoring without external calibration - critical for systems where rail margin is minimal.
Does MAX6332UR18D3+T provide active-high or active-low reset output, and what are its drive capabilities?
The MAX6332UR18D3+T provides an active-high push/pull RESET output. When asserted, it sources up to 200µA at 0.8×VCC (e.g., 1.44V at VCC = 1.8V); when deasserted, it sinks up to 1.2mA while maintaining VOL ≤0.3V. This eliminates the need for external pull-up resistors and enables direct interface to µP reset inputs requiring high-active assertion.
What is the minimum supply voltage at which MAX6332UR18D3+T guarantees correct reset behavior?
The MAX6332UR18D3+T guarantees correct reset assertion and deassertion down to VCC = 0.7V - verified across –40°C to +125°C. Below this, output drive strength degrades, but the device remains functional through deep brownout. This capability is essential for battery-powered systems where supply voltage collapses near end-of-life.
How does the 100ms reset timeout of MAX6332UR18D3+T improve system reliability compared to shorter timeouts?
The guaranteed ≥100ms reset timeout of MAX6332UR18D3+T ensures microcontrollers and FPGAs complete full power-on initialization sequences - including PLL lock, memory self-test, and peripheral configuration - before release. Shorter timeouts (e.g., 1ms or 20ms) risk premature release and undefined behavior in complex digital systems.
Is MAX6332UR18D3+T pin-compatible with legacy Maxim reset supervisors like MAX809?
No - MAX6332UR18D3+T is not pin-compatible with MAX809 series. While both use SOT23-3 packages, MAX809 has active-low RESET on pin 2, whereas MAX6332UR18D3+T uses active-high RESET on pin 2. Pin mapping differs: MAX6332UR18D3+T pin 1 = GND, pin 2 = RESET (high-active), pin 3 = VCC; MAX809 pin 1 = VCC, pin 2 = RESET (low-active), pin 3 = GND.
MAX6332UR18D3+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:
- 1.8V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX6332UR18D3+T FAQ
1.How can I place an order for MAX6332UR18D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6332UR18D3+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 MAX6332UR18D3+T reliable?
The price and inventory of MAX6332UR18D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6332UR18D3+T is usually 5 days.
3.What payment methods are accepted for MAX6332UR18D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6332UR18D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6332UR18D3+T?
MAX6332UR18D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6332UR18D3+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 MAX6332UR18D3+T?
For technical support, including MAX6332UR18D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6332UR18D3+T requirements.
6.How does Aetrix verify that MAX6332UR18D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6332UR18D3+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 MAX6332UR18D3+T meets industry standards.
7.What is the process for return or replacement of MAX6332UR18D3+T?
All MAX6332UR18D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6332UR18D3+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 MAX6332UR18D3+T part is unused and in its original packaging.
Return procedure for MAX6332UR18D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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