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Analog Devices Inc./Maxim Integrated MAX6332UR18D3
- Part No.:
- MAX6332UR18D3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6332UR18D3.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,586
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Product details
Overview
MAX6332UR18D3 from Maxim Integrated is a push/pull, active-high microprocessor supervisory circuit designed for 1.8V power supply monitoring in space-constrained embedded systems. It asserts a high-level RESET signal when VCC drops below 1.80V (±1.8% at +25°C), holds it for ≥100ms after VCC recovers, operates down to 0.7V supply, draws only 3.0–6.0µA at 1.8V, and comes in a 3-pin SOT23 package.
For engineers reviewing the MAX6332UR18D3 datasheet, MAX6332UR18D3 pinout, MAX6332UR18D3 application, or MAX6332UR18D3 equivalent, key selection criteria include its 1.80V factory-trimmed reset threshold, 100ms minimum timeout, active-high push/pull output, ultra-low 0.7V operating voltage, and guaranteed RESET validity down to VCC = 0.7V - critical for reliable brownout detection in battery-powered and automotive-grade control units.
Technical Context
The MAX6332UR18D3 implements a precision bandgap-based reset comparator with factory-trimmed 1.80V threshold (±1.8% at +25°C, ±3% over –40°C to +125°C) and internal timing circuitry generating a fixed ≥100ms reset timeout. Its push/pull output stage sources ≥200µA at 0.8×VCC when asserted and sinks ≤0.3V at 500µA when deasserted.
It features transient immunity up to 24µs for 10V/ms VCC falling edges and operates across –40°C to +125°C with no external components required. The device guarantees correct reset state down to VCC = 0.7V, enabling robust operation during deep brownouts in low-voltage microcontroller systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.80V ±1.8% at +25°C; ensures precise 1.8V supply monitoring without external calibration |
| Reset Timeout Period | ≥100ms minimum; provides sufficient hold time for full µP initialization after power recovery |
| Supply Voltage Range | 0.7V to 5.5V; supports operation during severe brownouts and compatibility with 1.8V/2.5V/3.3V systems |
| Supply Current | 3.0–6.0µA at VCC = 1.8V; enables multi-year battery life in portable instrumentation |
| Output Type | Active-high push/pull; eliminates need for external pull-up resistor and interfaces directly with CMOS reset inputs |
| Operating Temperature | –40°C to +125°C; qualified for under-hood automotive and industrial control environments |
| VCC Falling Propagation Delay | 24µs at 10V/ms; rejects short-duration supply glitches while responding promptly to true brownouts |
Pinout & Package
The MAX6332UR18D3 is housed in a RoHS-compliant 3-pin SOT23 package (outline 21-0051), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal pad omitted. Pin 1 = GND, Pin 2 = RESET (active-high push/pull), Pin 3 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Provides return path for internal comparator and output driver; must be connected to system ground plane for stable reset threshold |
| RESET (Pin 2) | Active-high reset output | Drives high during fault (VCC < 1.80V) and for ≥100ms after recovery; directly drives CMOS µP reset input without pull-up |
| VCC (Pin 3) | Supply input | Power source for internal circuitry; monitors this rail for reset assertion; 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; meets tight 1.8V I/O supply tolerance requirements |
| 100ms minimum reset timeout | Ensures µP completes power-on self-test and register initialization before release, even under slow-ramping supplies |
| 0.7V minimum operating voltage | Guarantees valid reset assertion during deep brownout events where VCC collapses below 1.0V |
| 3.3µA typical supply current | Reduces quiescent power in always-on monitoring circuits, extending battery runtime in portable medical devices |
| Transient-immune comparator | Rejects ≤24µs negative VCC glitches at 10V/ms, preventing spurious resets in electrically noisy industrial environments |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
Use Scenario: Real-time monitoring of 1.8V FPGA configuration supply in programmable logic controllers exposed to 48V field transients. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to halt FPGA configuration until 1.8V rail stabilizes post-brownout. Use Value: Prevents partial configuration corruption by guaranteeing ≥100ms hold time and valid reset down to 0.7V during 48V surge-induced supply sag. |
Use Scenario: Power sequencing in handheld ECG units powered by single-cell Li-ion batteries discharging from 4.2V to 2.8V. IC Role / Device Role / Timing Role: Monitoring the 1.8V analog front-end supply and asserting RESET to the MCU when battery voltage sags below safe operating level. Use Value: Enables reliable shutdown before ADC reference collapse, using only 3.3µA quiescent current to maximize battery service life. |
| Automotive Body Control Modules | Smart Sensor Nodes |
Use Scenario: Reset supervision for 1.8V CAN transceiver and microcontroller in under-dash body control units subject to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Active-high RESET generator ensuring µC remains held in reset during VCC dip below 1.80V during engine cranking. Use Value: Guarantees functional safety compliance by maintaining valid reset state down to 0.7V and rejecting ≤24µs transients per ISO 7637-2 Pulse 4. |
Use Scenario: Low-power environmental sensor node with 1.8V MCU and digital temperature/humidity sensor operating on energy harvesting. IC Role / Device Role / Timing Role: Ultra-low-current supervisor monitoring the harvested 1.8V rail and triggering MCU wake-up only after stable voltage is confirmed. Use Value: Reduces system standby power to sub-µA levels while ensuring deterministic reset behavior across –40°C to +125°C ambient range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR18D3-T | Same 1.80V threshold and 100ms timeout, but rated only to +85°C (vs. +125°C); lower ICC (2.5µA typ) | Not suitable for under-hood automotive or high-temp industrial use; limited to commercial-temperature applications | Select when ambient temperature stays ≤+85°C and lowest possible quiescent current is prioritized |
| TLV803EC18DBZR | 1.83V threshold (±2%), 140ms timeout, 0.9µA ICC, SOT23-3, but active-low open-drain output | Requires external pull-up; incompatible with µPs requiring active-high reset; better for ultra-low-power sleep modes | Choose only if system design accommodates active-low signaling and extended battery life outweighs active-high interface convenience |
Compared with MAX6326UR18D3-T and TLV803EC18DBZR, the MAX6332UR18D3 uniquely combines automotive-grade temperature range (–40°C to +125°C), active-high push/pull output eliminating external components, and guaranteed 0.7V operation - making it the only option among the three qualified for harsh-environment 1.8V microcontroller reset supervision without layout or firmware changes.
Availability
MAX6332UR18D3 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, and automotive body control modules requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX6332UR18D3 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, and computing applications.
The MAX6332UR18D3 belongs to Maxim's ultra-low-voltage μP supervisory family, engineered specifically for reliable reset generation in 1.8V–3.3V digital systems where supply margin is minimal and brownout resilience is critical.
FAQ
What is the exact reset threshold voltage of the MAX6332UR18D3 and how tightly is it specified?
The MAX6332UR18D3 has a factory-trimmed nominal reset threshold of 1.80V, with a tolerance of ±1.8% at +25°C and ±3% over the full –40°C to +125°C operating range. This specification ensures accurate 1.8V supply monitoring without external calibration, and the MAX6332UR18D3 maintains this accuracy across automotive and industrial temperature extremes.
Does the MAX6332UR18D3 provide a valid reset signal when VCC falls below 1.0V?
Yes - the MAX6332UR18D3 is guaranteed to assert and maintain a valid active-high RESET signal down to VCC = 0.7V, unlike many competing supervisors that fail below 1.0V. This capability is explicitly verified in the datasheet's Absolute Maximum Ratings and Electrical Characteristics tables, and the MAX6332UR18D3 uses internal circuitry to sustain output drive strength even near its minimum supply limit.
What is the reset timeout period of the MAX6332UR18D3 and is it adjustable?
The MAX6332UR18D3 provides a fixed minimum reset timeout period of 100ms after VCC rises above the 1.80V threshold. This value is factory-programmed and non-adjustable; the "D3" suffix in MAX6332UR18D3 explicitly denotes the 100ms variant. The MAX6332UR18D3 does not support external capacitor timing or software configuration - its timeout is fully internal and guaranteed over temperature.
How does the MAX6332UR18D3 handle fast supply transients, and what is its immunity specification?
The MAX6332UR18D3 rejects fast negative-going VCC transients up to 24µs in duration when the slew rate is 10V/ms, as confirmed in the Electrical Characteristics table under "VCC Falling Reset Delay". This transient immunity prevents false resets in electrically noisy environments such as motor drives or automotive systems, and the MAX6332UR18D3 achieves this via a proprietary comparator architecture that ignores brief supply dips.
Is the MAX6332UR18D3 pin-compatible with other Maxim reset ICs like the MAX809?
Yes - the MAX6332UR18D3 is explicitly stated in the datasheet to be pin-compatible with the MAX809/MAX810 and MAX6326/MAX6327/MAX6328 families in the 3-pin SOT23 package. All share identical pinout (GND, RESET, VCC), enabling drop-in replacement in existing layouts, though designers must verify output polarity (MAX6332UR18D3 is active-high, while MAX809 is active-low) and timing behavior before substitution.
MAX6332UR18D3 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:
- 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 FAQ
1.How can I place an order for MAX6332UR18D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6332UR18D3 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 reliable?
The price and inventory of MAX6332UR18D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6332UR18D3 is usually 5 days.
3.What payment methods are accepted for MAX6332UR18D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6332UR18D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6332UR18D3?
MAX6332UR18D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6332UR18D3 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?
For technical support, including MAX6332UR18D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6332UR18D3 requirements.
6.How does Aetrix verify that MAX6332UR18D3 is sourced from the original manufacturer or authorized distributors?
All MAX6332UR18D3 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 meets industry standards.
7.What is the process for return or replacement of MAX6332UR18D3?
All MAX6332UR18D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6332UR18D3, 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 part is unused and in its original packaging.
Return procedure for MAX6332UR18D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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