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Analog Devices Inc./Maxim Integrated MAX6328UR27+T
- Part No.:
- MAX6328UR27+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6328UR27+T.pdf
- Description:
- IC MPU/RESET CIRC 2.70V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,900
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Product details
Overview
MAX6328UR27+T from Maxim Integrated is an ultra-low-power open-drain microprocessor supervisory circuit that monitors VCC supply voltage and asserts an active-low reset signal when voltage falls below 2.70V, maintaining reset for ≥100ms after recovery. It operates from 1.2V to 5.5V, draws ≤1µA supply current, and is housed in a 3-pin SOT23-3 package for portable and battery-powered systems.
For engineers reviewing the MAX6328UR27+T datasheet, MAX6328UR27+T pinout, MAX6328UR27+T application, or MAX6328UR27+T equivalent, this device supports precise brownout detection in space-constrained µP systems requiring guaranteed reset assertion down to 1V VCC, transient-immune power monitoring, and bidirectional reset interface capability with pull-up resistor configuration.
Technical Context
The MAX6328UR27+T implements a factory-trimmed reset threshold of 2.70V ±2.5% over –40°C to +85°C, with 40ppm/°C tempco and 6.3mV hysteresis. Its open-drain RESET output sinks up to 1.6mA at 0.3V (VCC > 2.1V) and exhibits <0.1µA leakage when inactive.
It features immunity to fast VCC transients-rejecting negative glitches up to 200µs at 100mV overdrive-and guarantees correct reset state down to 1V VCC. The internal comparator ignores short-duration supply noise without external filtering components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.70V ±2.5% at –40°C to +85°C - ensures reliable brownout detection for 2.5V/3.3V systems |
| Supply Current | ≤1.0µA at 3V - enables multi-year operation in coin-cell–powered devices |
| Reset Timeout | 100ms minimum - meets JEDEC JESD85 power-on reset timing requirements |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brownout and full-supply conditions |
| Output Type | Open-drain RESET - allows wired-OR configuration and bidirectional µP reset pin interfacing |
| Reset Hysteresis | 6.3mV - prevents chatter near threshold during slow VCC recovery |
| Transient Immunity | Rejects ≤200µs negative VCC glitches at 100mV overdrive - eliminates false resets from digital noise |
Pinout & Package
MAX6328UR27+T is packaged in a RoHS-compliant 3-pin SOT23-3 (U3-1) surface-mount package with 0.95mm pitch and 2.9mm × 1.6mm footprint.
| 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 | Sinks current when asserted; requires external pull-up to VCC or another logic rail for level translation |
| 3 (VCC) | Supply input | Power source for internal circuitry; accepts 1.2V–5.5V; decoupling capacitor recommended within 5mm |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 1µA max enables integration into energy-harvesting and always-on sensor nodes without compromising battery life |
| Factory-trimmed VTH | 2.70V threshold with ±2.5% tolerance over full temperature range eliminates manual calibration or external resistive dividers |
| Open-drain output | Supports shared reset bus with multiple supervisors or µPs (e.g., Motorola 68HC11), enabling flexible system-level reset arbitration |
| No external components | Self-contained supervision eliminates BOM cost and PCB area for RC networks or comparators |
| 1V minimum VCC operation | Guarantees valid reset state even during severe brownout or backup battery fallback conditions |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Wearable ECG monitor powered by CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises 3.0V LDO output to ensure µC reset during battery sag below 2.7V and holds reset ≥100ms on recovery. Use Value: Prevents firmware corruption during low-battery brownout while extending operational lifetime via 1µA quiescent current. |
Use Scenario: DIN-rail mounted analog input module operating in 40–85°C ambient with 24VDC field supply. IC Role / Device Role / Timing Role: Monitors local 3.3V logic rail derived from switching regulator; asserts open-drain RESET to ARM Cortex-M4 core on undervoltage. Use Value: Enables robust reset coordination across distributed I/O nodes using shared pull-up, reducing inter-board wiring complexity. |
| Smart Meter Data Loggers | Automotive Body Control Units |
Use Scenario: Tamper-resistant electricity meter storing hourly consumption data to FRAM during mains outage. IC Role / Device Role / Timing Role: Detects 2.7V drop on supercap-backed 3.3V rail and initiates controlled shutdown sequence before VCC falls below 1.2V. Use Value: Guarantees nonvolatile memory write completion by holding µC in reset until backup power stabilizes or depletes safely. |
Use Scenario: Low-power door module with LIN transceiver and wake-on-LIN functionality. IC Role / Device Role / Timing Role: Supervises 5V buck converter output feeding µC and LIN PHY; open-drain RESET interfaces directly to shared vehicle reset bus. Use Value: Eliminates need for discrete level-shifting circuitry while meeting ISO 16750-2 pulse immunity requirements via built-in transient rejection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2+T | 2.93V fixed threshold; push-pull output; 1.2µA ICC; same SOT23-3 package | Requires external pull-down for active-low logic; lacks open-drain flexibility for shared buses | Select when system uses dedicated reset line and higher threshold aligns with 3.3V rail margin |
| TPS3808G125DBVR | 1.25V threshold; adjustable via external resistor; 1.1µA ICC; SOT23-6 package | 6-pin layout increases PCB area; threshold adjustment adds component count and calibration risk | Select only if sub-2.5V monitoring is required and design tolerates larger footprint and BOM complexity |
Compared with MAX809TRD2+T and TPS3808G125DBVR, the MAX6328UR27+T delivers optimal trade-off of precision 2.70V detection, open-drain interoperability, minimal footprint, and lowest quiescent current-making it the preferred choice for compact, battery-sensitive designs needing deterministic reset behavior without external components.
Availability
MAX6328UR27+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter data loggers, and automotive body control units requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX6328UR27+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 high-performance analog and mixed-signal ICs for industrial, computing, communications, and consumer applications.
The MAX6328UR27+T belongs to Maxim's ultra-low-power µP supervisory family, engineered specifically for reliable power-monitoring in battery-operated and space-constrained embedded systems where deterministic reset timing and minimal ICC are critical.
FAQ
What is the exact reset threshold voltage of MAX6328UR27+T and how tightly is it specified?
The MAX6328UR27+T has a factory-trimmed nominal reset threshold of 2.70V, guaranteed over –40°C to +85°C with ±2.5% tolerance (2.633V to 2.768V). This specification is validated per Electrical Characteristics table in the official datasheet, and includes 40ppm/°C tempco for predictable drift across temperature. The MAX6328UR27+T does not require external calibration or trimming.
Does MAX6328UR27+T support operation below 2.5V, and what is its minimum functional VCC?
Yes, the MAX6328UR27+T operates down to 1.2V over the full temperature range and is guaranteed to maintain correct reset state (i.e., assert RESET when VCC < VTH and release only after timeout) down to 1.0V. This makes the MAX6328UR27+T suitable for deep brownout scenarios and backup power domains where other supervisors fail.
Can MAX6328UR27+T drive a reset line shared with other ICs, and what external component is required?
Yes-the MAX6328UR27+T features an open-drain RESET output explicitly designed for wired-OR bus configurations. A single external pull-up resistor to the target logic rail (e.g., 3.3V or 5V) is required; no additional drivers or level shifters are needed. This capability is confirmed in the Applications Information section for interfacing with bidirectional µP reset pins.
How does MAX6328UR27+T handle fast VCC transients, and what is its immunity limit?
The MAX6328UR27+T rejects negative-going VCC transients up to 200µs in duration when the overdrive (VTH – VCC) is 100mV, as shown in Figure 4 of the datasheet. Its internal comparator architecture ignores fast glitches without requiring external RC filters-ensuring the MAX6328UR27+T does not generate spurious resets during digital switching noise or supply coupling events.
Is MAX6328UR27+T pin-compatible with legacy Maxim reset supervisors like MAX809?
No-while the MAX6328UR27+T shares the same 3-pin SOT23-3 package outline and pinout (GND, RESET, VCC), it is not functionally pin-compatible with MAX809 due to fundamental differences: MAX809 has push-pull output and different threshold options. The MAX6328UR27+T requires explicit pull-up configuration, whereas MAX809 does not. Direct substitution without circuit review is not recommended.
MAX6328UR27+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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.7V
- 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
MAX6328UR27+T FAQ
1.How can I place an order for MAX6328UR27+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6328UR27+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 MAX6328UR27+T reliable?
The price and inventory of MAX6328UR27+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6328UR27+T is usually 5 days.
3.What payment methods are accepted for MAX6328UR27+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6328UR27+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6328UR27+T?
MAX6328UR27+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6328UR27+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 MAX6328UR27+T?
For technical support, including MAX6328UR27+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6328UR27+T requirements.
6.How does Aetrix verify that MAX6328UR27+T is sourced from the original manufacturer or authorized distributors?
All MAX6328UR27+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 MAX6328UR27+T meets industry standards.
7.What is the process for return or replacement of MAX6328UR27+T?
All MAX6328UR27+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6328UR27+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 MAX6328UR27+T part is unused and in its original packaging.
Return procedure for MAX6328UR27+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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