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Analog Devices Inc./Maxim Integrated MAX6328XR31+T
- Part No.:
- MAX6328XR31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6328XR31+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,694
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Product details
Overview
MAX6328XR31+T from Maxim Integrated is an ultra-low-power, open-drain, active-low microprocessor supervisory circuit in SC70-3 package. It monitors VCC supply voltage and asserts reset when VCC falls below 3.08V (±2.5% over temperature), maintaining reset for ≥100ms after VCC recovers. Designed for portable/battery-powered systems, it draws ≤1µA at 3V and operates from 1.2V to 5.5V.
For engineers reviewing the MAX6328XR31+T datasheet, MAX6328XR31+T pinout, MAX6328XR31+T application, or MAX6328XR31+T equivalent, key selection criteria include its factory-trimmed 3.08V reset threshold, open-drain output for bidirectional µP reset pin interfacing (e.g., Motorola 68HC11), 100ms minimum reset timeout, immunity to fast VCC transients, and compatibility with 2.5V/3V/3.3V/5V power rails.
Technical Context
The MAX6328XR31+T implements a precision bandgap-based reset comparator with 40ppm/°C tempco and 6.3mV hysteresis, ensuring stable threshold behavior across -40°C to +85°C. Its open-drain RESET output requires an external pull-up and supports bidirectional reset assertion with microcontrollers like the 68HC11.
It features transient immunity: negative-going VCC glitches up to 200µs (at 200mV overdrive) are ignored, preventing false resets. The device remains functional down to VCC = 1.2V and guarantees correct reset state even at 1V during brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±2.5% over -40°C to +85°C - ensures reliable brownout detection for 3.3V systems with margin. |
| Supply Current | ≤1.0µA at 3V - enables multi-year battery life in portable equipment. |
| Reset Timeout | 100ms to 280ms - meets JEDEC JESD78 power-on reset timing requirements for most µPs. |
| Output Type | Open-drain active-low RESET - allows wired-OR configuration and direct interface to bidirectional µP reset pins. |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brownout and compatibility with 2.5V/3V/3.3V/5V rails. |
| Reset Hysteresis | 6.3mV - prevents oscillation near threshold during slow VCC recovery. |
| Transient Immunity | Rejects VCC glitches ≤200µs at 200mV overdrive - eliminates false resets from noise or switching spikes. |
Pinout & Package
MAX6328XR31+T is housed in a 3-pin SC70-3 package (outline X3-2), footprint-compatible with SOT23-3 but with smaller 1.25mm × 0.8mm body and 0.65mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output stage; must be low-impedance connection. |
| 2 | RESET | Open-drain active-low output; requires external pull-up resistor (typically 10–100kΩ) to system VCC or another rail. |
| 3 | VCC | Power supply input; powers internal circuitry and defines reset threshold reference point. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1µA max enables >10-year battery life in coin-cell–powered IoT sensors. |
| Factory-trimmed reset threshold | 3.08V with ±1.5% room-temp tolerance and ±2.5% over full temperature range ensures predictable system-level brownout behavior. |
| Open-drain output architecture | Enables seamless integration with µPs having bidirectional reset pins (e.g., 68HC11) without level-shifting or additional logic. |
| Guaranteed operation down to 1.2V | Ensures valid reset assertion during deep undervoltage events before system shutdown. |
| No external components required | Reduces BOM count, PCB area, and qualification effort-single IC replaces discrete RC reset networks. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable ECG monitor powered by CR2032 coin cell, requiring >5-year shelf life and reliable power-on initialization. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M0 MCU during cold start and brownout. Use Value: 1µA supply current extends battery life; 3.08V threshold aligns with 3.3V LDO output; open-drain output interfaces directly to MCU's bidirectional reset pin. |
Use Scenario: DIN-rail mounted I/O module operating in noisy factory environments with fluctuating 24VDC-derived 3.3V supplies. IC Role / Device Role / Timing Role: Power-supply monitor generating clean, glitch-immune reset signal for FPGA configuration controller. Use Value: 200µs transient immunity rejects switching noise from adjacent motor drives; 100ms reset pulse ensures complete FPGA initialization. |
| Smart Meter Communication Units | Automotive Body Control Modules (Non-AEC-Q) |
|
Use Scenario: NB-IoT-enabled electricity meter with dual power sources (mains + supercapacitor backup) and strict reset timing compliance. IC Role / Device Role / Timing Role: Primary supervisor ensuring µP reset during mains dropout and capacitor discharge transitions. Use Value: Guaranteed reset assertion down to 1.2V supports operation during capacitor sag; 3.08V threshold avoids premature reset during 3.3V rail ripple. |
Use Scenario: Aftermarket LED lighting controller using 12V-to-3.3V buck converter, subject to load-dump transients and cold-crank undervoltage. IC Role / Device Role / Timing Role: Brownout detector triggering controlled firmware shutdown before VCC collapses below µP operational limits. Use Value: 40ppm/°C tempco maintains threshold stability across under-hood temperature swings; SC70 package saves space on dense automotive PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR31+T | Push-pull active-low RESET output; no external pull-up required; higher output drive (1.6mA sink). | Suitable where board space prohibits pull-up resistors or where faster reset release is needed. | Select MAX6326XR31+T if system lacks pull-up infrastructure or requires deterministic high-Z release timing. |
| TLV803EB31DBVR | 3.08V threshold, open-drain, but higher 3.5µA supply current and only specified down to 1.8V VCC min. | Limited to applications with VCC ≥1.8V; less suitable for ultra-low-power or deep-brownout scenarios. | Choose TLV803EB31DBVR only if existing TI-based BOM mandates vendor consolidation and 1.2V operation is not required. |
Compared with MAX6328XR31+T, MAX6326XR31+T eliminates the need for an external pull-up but sacrifices bidirectional reset capability; TLV803EB31DBVR offers similar threshold accuracy but cannot guarantee reset assertion below 1.8V, limiting use in battery-dead scenarios.
Availability
MAX6328XR31+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter communication units, and automotive body control modules requiring stable component supply and long-term manufacturability.
Supply support for MAX6328XR31+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) designs precision analog, mixed-signal, and power management ICs for industrial, computing, and consumer applications.
The MAX6326/MAX6327/MAX6328 family delivers ultra-low-power, factory-trimmed supervisory circuits optimized for battery longevity and robust reset generation in space-constrained µP systems.
FAQ
What is the exact reset threshold voltage of MAX6328XR31+T and how does it vary with temperature?
The MAX6328XR31+T has a nominal reset threshold of 3.08V at +25°C, with ±1.5% tolerance at room temperature and ±2.5% over the full -40°C to +85°C operating range. Its temperature coefficient is 40ppm/°C, meaning threshold drift is tightly bounded and predictable across industrial temperatures - critical for consistent brownout response in field-deployed equipment.
Does MAX6328XR31+T require an external pull-up resistor on the RESET pin?
Yes, MAX6328XR31+T features an open-drain RESET output and requires an external pull-up resistor (typically 10kΩ to 100kΩ) to a valid voltage rail. This design enables wired-OR reset buses and direct interfacing with microprocessors that have bidirectional reset pins, such as the Motorola 68HC11 - a capability push-pull alternatives lack.
Can MAX6328XR31+T operate reliably when VCC drops below 2.0V?
Yes, MAX6328XR31+T is fully specified to operate and assert valid reset down to VCC = 1.2V over temperature, and guaranteed functional down to 1.0V. This ensures robust brownout detection during deep battery discharge or capacitor hold-up decay - a key differentiator versus many competitors limited to 1.8V minimum VCC.
How does MAX6328XR31+T handle fast voltage transients on the VCC line?
MAX6328XR31+T incorporates built-in transient immunity: it ignores negative-going VCC glitches up to 200µs in duration when the overdrive (VTH – VCC) is 200mV. This prevents spurious resets caused by switching noise or load transients - verified in the "Maximum Transient Duration vs. Reset Threshold Overdrive" graph in the datasheet.
Is MAX6328XR31+T pin-compatible with legacy Maxim reset ICs like MAX809?
Yes, MAX6328XR31+T is pin-compatible with MAX809, MAX803, and MAX810 in both SC70-3 and SOT23-3 packages. The pinout (GND, RESET, VCC) matches exactly, enabling drop-in replacement in existing designs - provided the open-drain output behavior and 3.08V threshold meet system requirements.
MAX6328XR31+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6328XR31+T FAQ
1.How can I place an order for MAX6328XR31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6328XR31+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 MAX6328XR31+T reliable?
The price and inventory of MAX6328XR31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6328XR31+T is usually 5 days.
3.What payment methods are accepted for MAX6328XR31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6328XR31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6328XR31+T?
MAX6328XR31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6328XR31+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 MAX6328XR31+T?
For technical support, including MAX6328XR31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6328XR31+T requirements.
6.How does Aetrix verify that MAX6328XR31+T is sourced from the original manufacturer or authorized distributors?
All MAX6328XR31+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 MAX6328XR31+T meets industry standards.
7.What is the process for return or replacement of MAX6328XR31+T?
All MAX6328XR31+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6328XR31+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 MAX6328XR31+T part is unused and in its original packaging.
Return procedure for MAX6328XR31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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