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Analog Devices Inc./Maxim Integrated MAX6328UR25-T
- Part No.:
- MAX6328UR25-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6328UR25-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX6328UR25-T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit designed to monitor 2.5V power supplies and assert reset during brownout, power-up, and power-down events. It features a factory-trimmed 2.500V reset threshold (±1.5% at +25°C, ±2.5% over -40°C to +85°C), 100ms minimum reset timeout, ultra-low 1µA max supply current, and operates down to 1V VCC. It is used in portable battery-powered systems requiring reliable, low-power supply monitoring.
For engineers reviewing the MAX6328UR25-T datasheet, MAX6328UR25-T pinout, MAX6328UR25-T application, or MAX6328UR25-T equivalent, key selection criteria include its open-drain RESET output compatibility with bidirectional µP reset pins (e.g., Motorola 68HC11), immunity to fast VCC transients, guaranteed state down to 1V, and SOT23-3 packaging for space-constrained designs.
Technical Context
The MAX6328UR25-T implements a precision bandgap-based voltage comparator with hysteresis (6.3mV) to detect VCC falling below 2.500V, triggering an active-low open-drain RESET signal. Its internal timing circuit ensures the reset pulse remains asserted for ≥100ms after VCC recovers above threshold.
It requires no external components, supports VCC from 1.2V to 5.5V across temperature, and features transient immunity-rejecting negative-going VCC glitches up to duration limits defined by reset threshold overdrive (e.g., ~200µs at 100mV overdrive). The device is fully specified from -40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.500V ±1.5% (25°C); ±2.5% (-40°C to +85°C) - ensures accurate 2.5V supply monitoring with defined tolerance budget |
| Reset Timeout | 100ms to 280ms - guarantees sufficient processor initialization time after power recovery |
| Supply Current | ≤1.0µA (max) at 3V - enables multi-year operation in coin-cell–powered devices |
| Output Type | Open-drain active-low RESET - allows wired-OR configuration and direct interface with bidirectional µP reset pins |
| Operating Voltage Range | 1.2V to 5.5V - supports valid reset assertion even during deep brownout conditions |
| VCC Transient Immunity | Rejects ≤200µs negative glitches at 100mV overdrive - prevents false resets from noise or switching spikes |
| Package | SOT23-3 - 2.92mm × 1.3mm footprint compatible with high-density PCB layouts |
Pinout & Package
MAX6328UR25-T is housed in a 3-pin SOT23-3 package (outline U3-1, land pattern 90-0179), with gull-wing leads, RoHS-compliant, tape-and-reel delivery only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output stage; must be low-impedance connection to system ground plane |
| 2 (RESET) | Active-low open-drain output | Drives low when VCC < 2.5V or during timeout; requires external pull-up for logic-high state; sinks ≥1.6mA |
| 3 (VCC) | Supply input | Power source for internal circuitry; accepts 1.2V–5.5V; internally monitored for reset generation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 1µA max enables >10-year battery life in always-on monitoring applications |
| Factory-trimmed precision threshold | 2.500V ±1.5% eliminates calibration overhead and external resistor networks |
| Open-drain RESET output | Supports shared reset bus and bidirectional µP interfaces without level-shifting |
| Guaranteed operation down to 1V | Ensures deterministic reset behavior during severe brownout or backup-supply handover |
| Transient-immune comparator | Rejects sub-200µs VCC dips, reducing false triggers in noisy power environments |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Wearable ECG patch operating from CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises 2.5V LDO output powering MCU and analog front-end; asserts RESET on battery sag below 2.5V. Use Value: 1µA quiescent current extends operational life; open-drain output interfaces directly with MCU's bidirectional reset pin, eliminating discrete logic. |
Use Scenario: DIN-rail mounted digital input module exposed to 24V DC field supply with ripple and load-switching transients. IC Role / Device Role / Timing Role: Monitors local 2.5V logic rail derived from isolated DC/DC converter; holds MCU in reset during input supply instability. Use Value: 100ms minimum timeout prevents spurious reboots; ±2.5% threshold tolerance over temperature ensures consistent trip point across industrial ambient range. |
| Smart Meter Communication Units | Automotive Body Control Modules (BCM) |
Use Scenario: NB-IoT modem subsystem powered by 2.5V buck regulator, requiring reliable startup after wake-from-sleep cycles. IC Role / Device Role / Timing Role: Generates clean, glitch-free reset pulse synchronized to 2.5V rail stabilization post-wake. Use Value: Transient immunity rejects switching noise from adjacent power stages; SOT23-3 footprint saves board area in compact meter PCBs. |
Use Scenario: Low-voltage domain (2.5V) in BCM microcontroller subsystem, subject to cold-crank and load-dump conditions. IC Role / Device Role / Timing Role: Provides fail-safe reset during battery voltage collapse (<2.5V) and ensures 100ms hold time for EEPROM write completion. Use Value: Guaranteed function down to 1V VCC maintains reset integrity during extreme brownout; hysteresis prevents chatter near threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR25-T | Push-pull active-low RESET output; same 2.5V threshold, 1µA ICC, SOT23-3 package | Requires no external pull-up; incompatible with wired-OR or bidirectional reset buses | Select when driving single-load reset lines and minimizing BOM count |
| TLV803EC25DBZR | 2.5V threshold, open-drain active-low RESET, 0.5µA ICC, SOT23-3; lower supply current but ±2% threshold accuracy over temp | Higher tempco (±50ppm/°C vs. 40ppm/°C); not qualified for extended industrial temp range (-40°C to +125°C) | Select for ultra-low-power priority where tighter threshold stability is secondary |
Compared with MAX6328UR25-T, MAX6326UR25-T offers simpler drive but lacks bus-sharing capability, while TLV803EC25DBZR trades threshold stability and temperature range for marginal current reduction-making MAX6328UR25-T optimal for robust, multi-device reset architectures in industrial and portable systems.
Availability
MAX6328UR25-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, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX6328UR25-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, computing, and communications markets.
The MAX632x family-including MAX6328UR25-T-is designed specifically for ultra-low-power, precision voltage supervision in battery-operated and space-constrained embedded systems, emphasizing reliability, minimal external components, and wide operating voltage range.
FAQ
What is the exact reset threshold voltage of MAX6328UR25-T and how does it vary with temperature?
The MAX6328UR25-T has a nominal reset threshold of 2.500V, with ±1.5% tolerance at +25°C and ±2.5% over the full -40°C to +85°C operating range. Its temperature coefficient is 40ppm/°C, meaning threshold drift is bounded and predictable-critical for stable operation in varying thermal environments. This specification is guaranteed per the datasheet's Electrical Characteristics table.
Does MAX6328UR25-T require an external pull-up resistor on the RESET pin?
Yes, MAX6328UR25-T features an open-drain RESET output and requires an external pull-up resistor to VCC or another logic rail to establish a valid high-level state when reset is inactive. Typical values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements. This design enables wired-OR configurations and compatibility with bidirectional microprocessor reset pins.
Can MAX6328UR25-T operate reliably during severe brownout conditions?
Yes, MAX6328UR25-T is guaranteed to maintain correct reset state down to VCC = 1.0V, and its internal circuitry remains functional throughout the 1.2V to 5.5V operating range. This ensures deterministic reset assertion even during deep brownout or backup-supply transitions-unlike many supervisors that cease operation below 1.8V.
What is the minimum reset pulse width guaranteed by MAX6328UR25-T after VCC recovers?
MAX6328UR25-T guarantees a minimum reset timeout of 100ms after VCC rises above the 2.500V threshold. The actual timeout ranges from 100ms to 280ms depending on process and temperature, providing ample margin for microcontroller initialization, PLL lock, and memory stabilization before release from reset.
Is MAX6328UR25-T pin-compatible with legacy Maxim reset ICs like MAX809?
Yes, MAX6328UR25-T is pin-compatible with MAX809 and other members of the MAX803/MAX809/MAX810 family in SOT23-3 packaging. Pin 1 = GND, Pin 2 = RESET (open-drain), Pin 3 = VCC. This allows drop-in replacement in existing designs-provided the application requires open-drain output and the 2.5V threshold matches system needs.
MAX6328UR25-T 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:
- 2.5V
- 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:
- SOT-23-3
MAX6328UR25-T FAQ
1.How can I place an order for MAX6328UR25-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6328UR25-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 MAX6328UR25-T reliable?
The price and inventory of MAX6328UR25-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6328UR25-T is usually 5 days.
3.What payment methods are accepted for MAX6328UR25-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6328UR25-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6328UR25-T?
MAX6328UR25-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6328UR25-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 MAX6328UR25-T?
For technical support, including MAX6328UR25-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6328UR25-T requirements.
6.How does Aetrix verify that MAX6328UR25-T is sourced from the original manufacturer or authorized distributors?
All MAX6328UR25-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 MAX6328UR25-T meets industry standards.
7.What is the process for return or replacement of MAX6328UR25-T?
All MAX6328UR25-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6328UR25-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 MAX6328UR25-T part is unused and in its original packaging.
Return procedure for MAX6328UR25-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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