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Analog Devices Inc./Maxim Integrated MAX6326UR25-T
- Part No.:
- MAX6326UR25-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6326UR25-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,133
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Product details
Overview
MAX6326UR25-T from Maxim Integrated is an ultra-low-power, active-low push-pull microprocessor supervisory circuit designed to monitor 2.5V power supplies and assert a reset signal during brownout or power-up conditions. 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, 1µA maximum 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 supervision.
For engineers reviewing the MAX6326UR25-T datasheet, MAX6326UR25-T pinout, MAX6326UR25-T application, or MAX6326UR25-T equivalent, key selection criteria include its 2.5V reset threshold accuracy, SOT23-3 package compatibility, push-pull active-low output drive capability, and guaranteed operation across industrial temperature range (-40°C to +85°C).
Technical Context
The MAX6326UR25-T implements a precision bandgap-based voltage comparator with hysteresis (6.3mV) to detect VCC drops below its 2.500V threshold. Its internal reset timer guarantees a minimum 100ms active-reset pulse width after VCC recovers, ensuring µP initialization completes reliably.
It uses a push-pull output stage capable of sourcing ≥500µA at 0.8·VCC and sinking ≥1.6mA at ≤0.3V (VCC > 2.1V), eliminating external pull-up resistors. The device ignores fast VCC transients (<20µs for 100mV overdrive) and remains functional down to 1.2V VCC, supporting low-voltage system operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.500V ±1.5% (25°C), ±2.5% (-40°C to +85°C); ensures precise 2.5V supply monitoring without external calibration |
| Supply Current | 1.0µA max at 3V; enables multi-year battery life in portable equipment |
| Reset Timeout | 100ms min power-on reset pulse; guarantees full µP initialization before release |
| Output Type | Active-low push-pull; drives RESET line directly without external pull-up resistor |
| VCC Operating Range | 1.2V to 5.5V; supports operation during deep brownout and across multiple supply rails |
| Reset Hysteresis | 6.3mV; prevents oscillation near threshold during slow VCC recovery |
| Tempco | 40ppm/°C; maintains threshold stability over full industrial temperature range |
Pinout & Package
MAX6326UR25-T is housed in a 3-pin SOT23-3 package (package code U3-1), with 1.3mm × 2.9mm footprint and 0.95mm height - compatible with high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal circuitry and reset output; must be connected to system ground plane |
| 2 (RESET) | Active-low push-pull reset output | Drives low during VCC fault or startup; actively pulls high when released; no external pull-up required |
| 3 (VCC) | Supply input | Power source for internal comparator and output driver; accepts 1.2V–5.5V; monitors this rail for reset condition |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 1µA supply current | Extends battery life in always-on portable devices without compromising supervision reliability |
| Factory-trimmed 2.500V threshold | Eliminates need for external resistor dividers or calibration; reduces BOM count and layout area |
| 100ms minimum reset timeout | Guarantees µP core and peripherals fully stabilize before release - no timing margin calculations needed |
| Push-pull active-low output | Directly interfaces with standard µP RESET inputs; avoids weak pull-up limitations of open-drain alternatives |
| VCC down to 1.2V operation | Enables supervision during deep brownout events where other supervisors fail silently |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable ECG patch operating from coin-cell battery with intermittent 2.5V LDO output. IC Role / Device Role / Timing Role: Supervises 2.5V rail and asserts RESET until stable; provides 100ms+ hold-off to ensure ADC and BLE radio initialize correctly. Use Value: 1µA quiescent current extends battery life beyond 2 years; 2.500V threshold matches LDO nominal output precisely. |
Use Scenario: DIN-rail mounted I/O module powered by 2.5V isolated DC-DC converter in noisy factory environment. IC Role / Device Role / Timing Role: Detects 2.5V rail collapse due to EMI or load surge; holds µC in reset for ≥100ms after recovery to prevent firmware corruption. Use Value: 40ppm/°C tempco and 6.3mV hysteresis prevent false resets from thermal drift or ripple-induced threshold crossings. |
| Smart Meter Data Loggers | Automated Test Equipment (ATE) |
|
Use Scenario: Battery-backed data logger sampling utility meter pulses, switching between 2.5V main and backup rails. IC Role / Device Role / Timing Role: Monitors both 2.5V rails independently via shared supervisor; asserts RESET on any rail drop below 2.500V. Use Value: Operates down to 1.2V VCC, enabling supervision even during backup rail brownout - critical for data integrity. |
Use Scenario: Rack-mounted ATE controller using 2.5V FPGA configuration voltage with strict power sequencing requirements. IC Role / Device Role / Timing Role: Generates clean, glitch-free reset pulse synchronized to 2.5V rail stabilization; push-pull output drives FPGA PROG_B pin directly. Use Value: Push-pull drive strength (≥1.6mA sink) meets FPGA reset input current specs without added buffer IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2-T | 2.53V reset threshold (±2.5%), 1.2µA max ICC, SOT23-3, push-pull active-low | Higher threshold tolerance and slightly higher quiescent current; identical pinout and function | Select when legacy MAX809 footprint reuse is required and ±2.53V threshold is acceptable |
| TPS3808G25DBVR | 2.5V threshold (±0.5% initial, ±1.5% over temp), 1.8µA max ICC, SOT23-6 (different pinout) | Higher initial accuracy but larger package and non-pin-compatible layout; requires PCB redesign | Select when tighter threshold accuracy justifies layout change and higher supply current is tolerable |
Compared with MAX6326UR25-T, MAX809TRD2-T offers identical form factor and function but with looser threshold tolerance and marginally higher ICC, while TPS3808G25DBVR delivers superior accuracy in a non-compatible 6-pin package - making MAX6326UR25-T optimal for space-constrained 2.5V systems needing proven low-power reliability.
Availability
MAX6326UR25-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter data loggers, and automated test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX6326UR25-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 and mixed-signal ICs for power, sensing, interface, and reliability-critical applications.
The MAX6326 family delivers ultra-low-power, factory-trimmed µP reset supervision for battery-operated and industrial systems where supply voltage accuracy, long-term stability, and minimal board area are essential.
FAQ
What is the exact reset threshold voltage of MAX6326UR25-T and how tightly is it specified?
The MAX6326UR25-T has a factory-trimmed nominal reset threshold of 2.500V, guaranteed within ±1.5% at +25°C and ±2.5% across the full -40°C to +85°C operating temperature range. This specification is confirmed in the Electrical Characteristics table of the official datasheet, with typical hysteresis of 6.3mV to prevent chatter near the threshold. The "R25" suffix explicitly denotes the 2.500V variant.
Does MAX6326UR25-T require an external pull-up resistor on its RESET pin?
No, MAX6326UR25-T does not require an external pull-up resistor because it features a push-pull active-low output. Its RESET pin actively drives high (to ≥0.8·VCC) when released and low (≤0.3V at 1.6mA sink) during assertion. This eliminates reliance on weak external pull-ups and ensures robust drive into µP reset inputs, unlike open-drain alternatives such as MAX6328UR25-T.
What is the minimum VCC voltage at which MAX6326UR25-T remains functional and continues to assert reset?
MAX6326UR25-T is guaranteed to maintain correct reset state down to VCC = 1.2V over the full -40°C to +85°C temperature range. Below 1.2V, behavior is not characterized; however, the device will continue asserting RESET as long as VCC remains below 2.500V and sufficient current is available to sustain the output stage - critical for brownout detection in low-voltage systems.
How long does the RESET signal stay active after VCC rises above the 2.500V threshold?
The MAX6326UR25-T guarantees a minimum reset timeout of 100ms after VCC rises above the 2.500V threshold, with typical values up to 185ms and a maximum of 280ms across temperature. This fixed delay is generated internally and does not depend on external components, ensuring consistent µP initialization timing regardless of system capacitance or load conditions.
Is MAX6326UR25-T pin-compatible with other members of the MAX6326/MAX6327/MAX6328 family?
Yes, MAX6326UR25-T is pin-compatible with all SOT23-3 variants in the MAX6326/MAX6327/MAX6328 series, including MAX6327UR25-T (active-high push-pull) and MAX6328UR25-T (active-low open-drain). All share identical 3-pin SOT23-3 pinout (VCC, RESET, GND), enabling direct substitution where output logic polarity and drive type match the target design requirements.
MAX6326UR25-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:
- 2.5V
- 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
MAX6326UR25-T FAQ
1.How can I place an order for MAX6326UR25-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6326UR25-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 MAX6326UR25-T reliable?
The price and inventory of MAX6326UR25-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6326UR25-T is usually 5 days.
3.What payment methods are accepted for MAX6326UR25-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6326UR25-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6326UR25-T?
MAX6326UR25-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6326UR25-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 MAX6326UR25-T?
For technical support, including MAX6326UR25-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6326UR25-T requirements.
6.How does Aetrix verify that MAX6326UR25-T is sourced from the original manufacturer or authorized distributors?
All MAX6326UR25-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 MAX6326UR25-T meets industry standards.
7.What is the process for return or replacement of MAX6326UR25-T?
All MAX6326UR25-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6326UR25-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 MAX6326UR25-T part is unused and in its original packaging.
Return procedure for MAX6326UR25-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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