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Analog Devices Inc./Maxim Integrated MAX6326UR23-T
- Part No.:
- MAX6326UR23-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6326UR23-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,029
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Product details
Overview
MAX6326UR23-T from Maxim Integrated is an ultra-low-power, active-low push-pull microprocessor supervisory circuit designed to monitor 2.5V–5V power supplies and assert a reset signal during brownout, power-up, or power-down events. It features a factory-trimmed 2.32V reset threshold (±2.5% over –40°C to +85°C), 100ms minimum reset timeout, 1µA max supply current at 3V, and operates down to 1.2V VCC. It is used in portable battery-powered systems requiring reliable, low-quiescent-power reset assertion.
For engineers reviewing the MAX6326UR23-T datasheet, MAX6326UR23-T pinout, MAX6326UR23-T application, or MAX6326UR23-T equivalent, this page delivers verified electrical behavior, SOT23-3 package integration details, temperature-stable reset timing, and direct alternatives for µP reset supervision in space-constrained embedded designs.
Technical Context
The MAX6326UR23-T implements a precision bandgap-based voltage comparator with hysteresis (6.3mV) to detect VCC drops below its 2.32V threshold. Its internal reset timer guarantees ≥100ms assertion after VCC recovers, independent of supply ramp rate.
It uses a push-pull output stage capable of sourcing 500µA at 0.8·VCC and sinking 1.6mA at ≤0.3V - eliminating external pull-up resistors. The device ignores transients <100µs (at 200mV overdrive) and is fully specified from –40°C to +85°C with 40ppm/°C reset threshold tempco.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32V ±2.5% (–40°C to +85°C); ensures reliable detection of 2.5V supply brownout before system instability. |
| Supply Current | 1.0µA max at 3V; enables multi-year operation in coin-cell–powered IoT sensors and wearables. |
| Reset Timeout | 100ms min power-up delay; satisfies Intel-compatible µP reset hold-time requirements without external RC. |
| Output Type | Active-low push-pull; drives reset lines directly-no pull-up resistor needed-reducing BOM count and board area. |
| VCC Operating Range | 1.2V to 5.5V; supports supervision of deep-sleep logic rails and legacy 5V microcontrollers from a single device. |
| Reset Hysteresis | 6.3mV; prevents chatter during slow VCC recovery near threshold, improving system boot reliability. |
| Tempco | 40ppm/°C; maintains threshold accuracy across industrial temperature range without calibration. |
Pinout & Package
MAX6326UR23-T is housed in a 3-pin SOT23-3 package (outline U3-1), footprint-compatible with industry-standard µP reset supervisors and optimized for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output driver; must be connected to system ground plane for noise immunity. |
| 2 (RESET) | Active-low push-pull reset output | Drives µP RESET pin low during fault; actively pulls high when released-no external pull-up required. |
| 3 (VCC) | Supply input | Monitored power rail input; powers internal circuitry and defines reset assertion level via internal voltage divider. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 1µA supply current | Extends battery life in always-on monitoring nodes without compromising reset responsiveness. |
| Factory-trimmed 2.32V threshold | Eliminates manual calibration; matches common 2.5V LDO output tolerances for seamless integration. |
| 100ms guaranteed reset timeout | Meets JEDEC JESD79-4 DDR4 controller reset timing and avoids premature release during slow-ramp supplies. |
| Push-pull active-low output | Reduces component count by removing external pull-up resistor; simplifies layout and improves EMI performance. |
| Transient immunity up to 100µs | Suppresses false resets caused by switching regulator noise or digital crosstalk on VCC line. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable ECG patch operating from CR2032 battery with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises 2.5V analog front-end and 3.3V MCU core; asserts reset if battery sags below 2.32V during RF burst. Use Value: 1µA quiescent current extends usable battery life beyond 18 months; push-pull output ensures clean reset edge into MCU's bidirectional reset pin. |
Use Scenario: DIN-rail mounted I/O module exposed to 40–85°C ambient with 24VDC-to-3.3V conversion. IC Role / Device Role / Timing Role: Monitors post-regulator 3.3V rail; holds µP in reset during input undervoltage or thermal shutdown recovery. Use Value: ±2.5% threshold tolerance over full temperature range prevents spurious resets in unventilated enclosures; 100ms timeout accommodates slow LDO recovery. |
| Smart Meter Data Loggers | Automotive Body Control Units |
|
Use Scenario: Tamper-resistant electricity meter with backup supercapacitor and real-time clock. IC Role / Device Role / Timing Role: Detects main supply failure and triggers controlled save-to-EEPROM sequence before VCC drops below 2.32V. Use Value: 1.2V minimum VCC operation allows continued supervision during capacitor discharge decay; hysteresis prevents oscillation near cutoff. |
Use Scenario: Low-power door module with CAN transceiver and wake-on-LIN functionality. IC Role / Device Role / Timing Role: Supervises 5V system rail derived from vehicle battery; asserts reset during cold-crank (4.5V dip) or load-dump recovery. Use Value: Immunity to 100µs transients rejects alternator noise; push-pull output interfaces directly with automotive-grade µP reset inputs rated for 5V tolerant logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3-T | Same SOT23-3 package, 2.32V threshold, but 2.5µA max ICC and no guaranteed 1.2V operation. | Lacks ultra-low-current capability for >5-year battery life; suitable only where supply current >1µA is acceptable. | Select MAX809TRD3-T only if legacy qualification or second-source validation is required; not recommended for new ultra-low-power designs. |
| TPS3808G125DBVR | 2.33V threshold, 1.8µA max ICC, supports 1.8–6V VCC, but requires external pull-up for open-drain output. | Open-drain output increases BOM count and adds routing complexity; higher ICC reduces battery runtime vs. MAX6326UR23-T. | Choose TPS3808G125DBVR only when dual-supply supervision or adjustable delay is needed; MAX6326UR23-T offers superior integration for fixed-threshold, low-ICC use. |
Compared with MAX809TRD3-T and TPS3808G125DBVR, MAX6326UR23-T uniquely combines 1µA max supply current, push-pull output (no pull-up), 1.2V operational floor, and 2.32V precision threshold in SOT23-3-making it optimal for long-life, space-constrained, single-rail reset supervision.
Availability
MAX6326UR23-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 and long-term lifecycle support.
Supply support for MAX6326UR23-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 applications.
The MAX6326 family was engineered specifically for ultra-low-power microprocessor reset supervision in battery-operated and thermally demanding environments, emphasizing precision threshold stability, minimal quiescent current, and robust transient immunity.
FAQ
What is the exact reset threshold voltage of MAX6326UR23-T and how does it vary with temperature?
The MAX6326UR23-T has a nominal reset threshold of 2.32V at +25°C, with a tolerance of ±1.5% at room temperature and ±2.5% over the full –40°C to +85°C operating range. Its temperature coefficient is 40ppm/°C, meaning the threshold drifts less than 10mV across the industrial temperature span-ensuring consistent brownout detection without recalibration.
Does MAX6326UR23-T require an external pull-up resistor on its RESET pin?
No, MAX6326UR23-T does not require an external pull-up resistor because it features an active-low push-pull output. The internal driver actively pulls the RESET pin high when released and low during reset assertion-eliminating the need for external components and reducing PCB area and BOM cost.
Can MAX6326UR23-T operate reliably at VCC = 1.2V?
Yes, MAX6326UR23-T is fully specified to operate down to 1.2V VCC over –40°C to +85°C. At this voltage, it maintains functional reset assertion and release behavior-including valid output drive strength and timing-enabling supervision of ultra-low-voltage logic rails and energy-harvesting systems.
How long is the reset pulse width generated by MAX6326UR23-T after VCC rises above the threshold?
MAX6326UR23-T guarantees a minimum reset pulse width of 100ms after VCC rises above the 2.32V threshold. Typical timeout is 185ms, with a maximum of 280ms across temperature and process variation-ensuring compatibility with all major microprocessors' reset hold-time requirements without external timing components.
Is MAX6326UR23-T pin-compatible with other common reset supervisors like MAX809?
Yes, MAX6326UR23-T is pin-compatible with MAX809 series devices in SOT23-3 packaging (e.g., MAX809TRD3-T), sharing identical pin 1 (GND), pin 2 (RESET), and pin 3 (VCC) assignments. However, differences in supply current, VCC operating floor, and transient immunity require verification for drop-in replacement in ultra-low-power or wide-temperature applications.
MAX6326UR23-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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.32V
- Output:
- Push-Pull, Totem Pole
- 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
MAX6326UR23-T FAQ
1.How can I place an order for MAX6326UR23-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6326UR23-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 MAX6326UR23-T reliable?
The price and inventory of MAX6326UR23-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6326UR23-T is usually 5 days.
3.What payment methods are accepted for MAX6326UR23-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6326UR23-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6326UR23-T?
MAX6326UR23-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6326UR23-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 MAX6326UR23-T?
For technical support, including MAX6326UR23-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6326UR23-T requirements.
6.How does Aetrix verify that MAX6326UR23-T is sourced from the original manufacturer or authorized distributors?
All MAX6326UR23-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 MAX6326UR23-T meets industry standards.
7.What is the process for return or replacement of MAX6326UR23-T?
All MAX6326UR23-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6326UR23-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 MAX6326UR23-T part is unused and in its original packaging.
Return procedure for MAX6326UR23-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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