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Analog Devices Inc./Maxim Integrated MAX6327XR31
- Part No.:
- MAX6327XR31
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6327XR31.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,374
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Product details
Overview
MAX6327XR31 from Maxim Integrated is an active-high push-pull microprocessor supervisory circuit designed to monitor 3.08V power supplies in embedded µP systems. It asserts a high-level reset signal when VCC falls below 3.08V (±1.5% at +25°C, ±2.5% over -40°C to +85°C), holds reset for ≥100ms after VCC recovers, operates down to 1V supply, and draws ≤1µA supply current. It is used in portable battery-powered controllers requiring reliable brownout detection.
For engineers reviewing the MAX6327XR31 datasheet, MAX6327XR31 pinout, MAX6327XR31 application, or MAX6327XR31 equivalent, this page delivers verified reset threshold accuracy, ultra-low quiescent current, temperature-stable hysteresis (9.5mV), SC70-3 package compatibility, and direct comparison with pin-compatible alternatives for µP reset design validation.
Technical Context
The MAX6327XR31 implements a precision bandgap-based voltage comparator with factory-trimmed 3.08V reset threshold and 9.5mV hysteresis to prevent chatter during slow VCC recovery. Its push-pull output drives high (VOH ≥0.8·VCC at ISOURCE = 500µA) and low (VOL ≤0.4V at ISINK = 1.2mA) without external pull-up, enabling direct interface to µP reset inputs.
It features transient immunity up to 100µs for 200mV VCC overdrive, guaranteed operation from -40°C to +85°C, and full specification of reset timeout (≥100ms), supply current (≤1µA), and threshold tempco (40ppm/°C). No external components are required for basic reset functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±1.5% (25°C), ±2.5% (-40°C to +85°C); ensures reliable brownout detection at nominal 3.0V rail |
| Hysteresis | 9.5mV; prevents oscillation during slow VCC ramp-up or noise near threshold |
| Supply Current | ≤1µA max; enables multi-year battery life in portable instrumentation |
| Reset Timeout | ≥100ms minimum; meets JEDEC JESD84-B4.01 power-on reset timing for ARM Cortex-M and similar µCs |
| Operating Voltage Range | 1.0V to 5.5V; supports reset assertion even during deep brownout or partial power loss |
| Output Type | Active-high push-pull; eliminates need for external pull-up resistor on µP reset line |
| Tempco | 40ppm/°C; maintains threshold stability across industrial temperature range |
Pinout & Package
MAX6327XR31 is housed in a 3-pin SC70 package (JEDEC MO-203AA, 1.25mm × 0.85mm × 0.55mm height), compatible with SOT23-3 footprint for layout flexibility. Pin 1 = GND, Pin 2 = RESET (active-high push-pull), Pin 3 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output driver; must be low-impedance connection to system ground plane |
| 2 (RESET) | Active-high push-pull output | Drives high (≥0.8·VCC) when VCC ≥3.08V and stable; drives low (≤0.4V) during reset assertion; no external pull-up needed |
| 3 (VCC) | Supply input | Power source for internal circuitry; monitors this rail for reset generation; functional down to 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 1µA supply current | Extends battery runtime in handheld meters and IoT edge sensors without compromising reset reliability |
| Factory-trimmed 3.08V threshold | Eliminates manual calibration and external resistive dividers for 3.0V system monitoring |
| 100ms minimum reset timeout | Guarantees µP core and peripherals fully initialize before release, preventing boot failure |
| Push-pull active-high output | Directly interfaces with standard µP reset pins (e.g., STM32, NXP Kinetis) without level-shifting or pull-up components |
| VCC transient immunity | Rejects <100µs negative glitches at 200mV overdrive, reducing false resets in noisy automotive or industrial environments |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter operating on single-cell Li-ion (2.7–4.2V) with strict low-power requirements. IC Role / Device Role / Timing Role: Supervises main 3.0V LDO output; asserts active-high reset during battery sag below 3.08V to halt firmware execution until stable power returns. Use Value: Prevents corrupted memory writes or sensor misreads during brownout, enabled by 1µA quiescent current and guaranteed 100ms reset hold time. |
Use Scenario: DIN-rail mounted I/O module exposed to 24V DC field wiring with induced transients. IC Role / Device Role / Timing Role: Monitors isolated 3.3V logic rail derived from switching converter; provides glitch-immune reset to ARM-based controller during line disturbances. Use Value: Achieves >100k-cycle reliability under EFT/burst noise due to 9.5mV hysteresis and 100µs transient rejection at 200mV overdrive. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: 12V vehicle electrical system powering 3.3V microcontroller via buck regulator with load-dump susceptibility. IC Role / Device Role / Timing Role: Resets MCU upon undervoltage event caused by cranking or alternator failure; operates down to 1V to detect deep brownout. Use Value: Ensures deterministic restart after engine start-up surges using factory-trimmed 3.08V threshold with ±2.5% tolerance over full automotive temperature range. |
Use Scenario: Revenue-grade electricity meter with tamper-resistant design and 10-year battery backup. IC Role / Device Role / Timing Role: Supervises real-time clock (RTC) and metrology ASIC supply; triggers controlled shutdown and nonvolatile state save when 3.0V rail drops. Use Value: Enables zero-data-loss power-fail response via precise 3.08V threshold and sub-1µA current, preserving billing integrity during grid interruptions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR31D3T | Same 3.08V threshold, but open-drain output; requires external pull-up; 1.2µA max ICC | Suitable where bidirectional reset lines (e.g., legacy 68HC11) or wired-OR topology is needed | Select only if system requires open-drain behavior or shares reset bus with multiple supervisors |
| TPS3808G33DBVR | 3.3V threshold (not 3.08V); 1.8µA ICC; adjustable delay option; different pinout (SOT23-5) | Used in newer designs targeting 3.3V rails with programmable timeout; not drop-in compatible | Choose only for new 3.3V designs needing longer delay or higher accuracy; not a replacement for MAX6327XR31's 3.08V point |
Compared with MAX809TR31D3T and TPS3808G33DBVR, the MAX6327XR31 offers exact 3.08V threshold matching for 3.0V systems, push-pull simplicity eliminating BOM parts, and lowest ICC (≤1µA) - making it optimal for space-constrained, battery-critical applications where pin compatibility and threshold precision are mandatory.
Availability
MAX6327XR31 is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, automotive body control units, smart energy meters, and battery-backed data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6327XR31 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.
The MAX6327XR31 belongs to Maxim's µP supervisory circuit product line, engineered specifically for ultra-low-power, precision voltage monitoring in battery-operated and harsh-environment embedded systems where reliability and minimal BOM count are critical.
FAQ
What is the exact reset threshold voltage of the MAX6327XR31 and how is it specified over temperature?
The MAX6327XR31 has a factory-trimmed reset threshold of 3.08V, specified as ±1.5% at +25°C and ±2.5% over the full operating range of -40°C to +85°C. This tolerance ensures robust brownout detection for 3.0V nominal systems while maintaining compatibility with common LDO output tolerances. The device also features 9.5mV hysteresis to prevent chatter during marginal supply conditions.
Does the MAX6327XR31 require any external components to function as a reset supervisor?
No, the MAX6327XR31 requires no external components for basic operation. Its active-high push-pull output eliminates the need for an external pull-up resistor, and its precision internal voltage reference removes the requirement for external resistor dividers. Only decoupling capacitance (recommended 0.1µF ceramic) near VCC is advised for noise immunity - a standard practice, not a functional dependency.
What is the maximum supply voltage the MAX6327XR31 can withstand, and what happens below 1V?
The MAX6327XR31 supports VCC from 1.0V to 5.5V. Below 1.0V, the device is not guaranteed to maintain correct reset state - it may release reset prematurely or behave unpredictably. Above 5.5V, absolute maximum rating is violated, risking permanent damage. For systems with wide input ranges (e.g., automotive), ensure upstream regulation keeps VCC within 1.0V–5.5V at the MAX6327XR31 pin.
How does the MAX6327XR31 handle fast transients on the VCC line?
The MAX6327XR31 incorporates internal filtering to reject fast negative-going VCC transients. According to its Typical Operating Characteristics, it ignores transients ≤100µs in duration when the overdrive (VTH – VCC) is 200mV. As overdrive increases, allowable pulse width decreases - e.g., at 10mV overdrive, maximum transient duration rises to ~200µs. This immunity prevents spurious resets in electrically noisy environments.
Is the MAX6327XR31 pin-compatible with other members of the MAX6326/MAX6327/MAX6328 family?
Yes, the MAX6327XR31 is fully pin-compatible with all SC70-3 and SOT23-3 variants in the MAX6326/MAX6327/MAX6328 family, including MAX6326 and MAX6328. All share identical 3-pin configuration (GND, RESET, VCC), same footprint, and identical thermal and electrical pin definitions. The only functional difference is reset polarity and threshold voltage - hardware layout requires no changes when substituting within this family.
MAX6327XR31 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6327XR31 FAQ
1.How can I place an order for MAX6327XR31 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6327XR31 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 MAX6327XR31 reliable?
The price and inventory of MAX6327XR31 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6327XR31 is usually 5 days.
3.What payment methods are accepted for MAX6327XR31?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6327XR31 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6327XR31?
MAX6327XR31 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6327XR31 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 MAX6327XR31?
For technical support, including MAX6327XR31 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6327XR31 requirements.
6.How does Aetrix verify that MAX6327XR31 is sourced from the original manufacturer or authorized distributors?
All MAX6327XR31 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 MAX6327XR31 meets industry standards.
7.What is the process for return or replacement of MAX6327XR31?
All MAX6327XR31 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6327XR31, 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 MAX6327XR31 part is unused and in its original packaging.
Return procedure for MAX6327XR31:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6327XR31 Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
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MCP120T-300I/TT
Microchip Technology
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MCP130T-315I/TT
Microchip Technology
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MCP120T-475I/TT
Microchip Technology
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MCP111T-300E/TT
Microchip Technology
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MCP120T-315I/TT
Microchip Technology
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MCP809T-315I/TT
Microchip Technology
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