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Analog Devices Inc./Maxim Integrated MAX6326UR28+T
- Part No.:
- MAX6326UR28+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX6326UR28+T.pdf
- Description:
- IC MPU/RESET CIRC 2.80V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,544
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Product details
Overview
MAX6326UR28+T from Maxim Integrated is an ultra-low-power, active-low push-pull microprocessor supervisory circuit in SOT23-3 package, monitoring VCC supply voltage with a factory-trimmed 2.80V reset threshold (±1.5% at +25°C, ±2.5% over -40°C to +85°C), 100ms minimum reset timeout, and 1µA max supply current - used for reliable power-on/brownout reset assertion in portable 3.3V embedded systems.
For engineers reviewing the MAX6326UR28+T datasheet, MAX6326UR28+T pinout, MAX6326UR28+T application, or MAX6326UR28+T equivalent, this page delivers verified electrical parameters, thermal behavior, transient immunity specs, SOT23-3 footprint compatibility, and direct alternatives for µP reset supervision in battery-powered and industrial control designs.
Technical Context
The MAX6326UR28+T implements a precision bandgap-based reset comparator with hysteresis (6.3mV) and internal timing capacitor to guarantee ≥100ms reset pulse width after VCC rises above 2.80V. It operates down to 1.2V VCC and asserts RESET low during power-up, brownout, and power-down events.
Its push-pull output drives high (VOH ≥ 0.8·VCC at ISOURCE = 500µA) when not asserted and low (VOL ≤ 0.3V at ISINK = 1.6mA) when asserted, eliminating external pull-up resistors. The device rejects fast VCC transients up to 100V/µs and exhibits 40ppm/°C reset threshold tempco.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.80V ±1.5% at +25°C; ensures reliable reset assertion for 3.3V systems experiencing brownout down to ~2.76V |
| Supply Current | 1.0µA max at VCC = 3.2V; enables multi-year battery life in always-on portable instrumentation |
| Reset Timeout | 100ms min power-up delay; satisfies Intel-compatible µP reset timing requirements without external RC |
| VCC Operating Range | 1.2V to 5.5V over -40°C to +85°C; supports wide-input industrial power rails and Li-ion battery discharge profiles |
| Output Type | Active-low push-pull; drives RESET directly to µP reset pin without pull-up resistor or level-shifter |
| Reset Hysteresis | 6.3mV; prevents chatter during slow VCC recovery near threshold, improving system stability |
| Transient Immunity | Rejects VCC glitches ≤20µs at 200mV overdrive; suppresses noise-induced false resets in noisy EMI environments |
Pinout & Package
SOT23-3 package (3-pin, 1.3mm × 2.9mm × 1.0mm body, 0.95mm pitch), 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 push-pull reset output | Drives low during reset condition (VCC < 2.80V); actively pulls high when deasserted - no external pull-up required |
| 3 - VCC | Supply input | Monitored power rail input; accepts 1.2V–5.5V; internally powers reset logic and output driver |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 1µA max enables >10-year shelf life in coin-cell-powered IoT sensors and medical wearables |
| Precision VTH trim | Factory-set 2.80V threshold with ±1.5% room-temp tolerance eliminates manual calibration or trimming components |
| No external components | Integrated timing capacitor and comparator eliminate discrete R/C networks, reducing BOM count and PCB area by ≥3 parts |
| Wide temperature spec | Guaranteed operation from -40°C to +85°C with full parameter compliance - suitable for automotive under-hood and industrial PLC use |
| Push-pull output | Eliminates need for external pull-up resistor, reducing standby current and simplifying interface to standard µP reset inputs |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Wearable ECG patch powered by CR2032 coin cell, requiring guaranteed reset during battery voltage sag below 2.8V. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to ARM Cortex-M0 microcontroller on power-up and brownout. Use Value: 1µA max ICC extends battery life beyond 3 years; 2.80V threshold matches typical CR2032 end-of-life voltage profile. |
Use Scenario: DIN-rail mounted I/O module operating from 24VDC supply with local 3.3V LDO, subject to load-dump transients. IC Role / Device Role / Timing Role: Primary reset supervisor ensuring µC enters known state after power interruption or rail collapse. Use Value: 100ms minimum reset pulse prevents spurious firmware execution; 40ppm/°C tempco maintains accuracy across -25°C to +70°C enclosure range. |
| Smart Metering Endpoints | POS Terminal Controllers |
Use Scenario: AMI smart meter with dual-supply (battery backup + mains-derived 3.3V), needing fail-safe reset during AC loss. IC Role / Device Role / Timing Role: Monitors main 3.3V rail and triggers hard reset to prevent corrupted flash writes during brownout. Use Value: 6.3mV hysteresis avoids oscillation during slow VCC recovery; push-pull output ensures clean logic-level transition to reset controller. |
Use Scenario: Retail point-of-sale terminal using 3.3V SoC, exposed to frequent hot-plug power events and ESD. IC Role / Device Role / Timing Role: Reset supervisor interfacing directly to SoC's dedicated reset pin with no external passive components. Use Value: Transient immunity up to 100V/µs suppresses ESD-induced false resets; SOT23-3 footprint fits tight space constraints on compact PCBs. |
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 | Same SOT23-3, 2.80V threshold, but 2.5µA max ICC and no guaranteed 1V operation | Lacks ultra-low-power capability; unsuitable for multi-year battery operation | Select MAX6326UR28+T when ICC < 1.5µA and VCC-down-to-1V operation are mandatory |
| TPS3808G33DBVR | 2.93V threshold (not 2.80V), 1.8µA ICC, open-drain output requiring pull-up | Requires external 10kΩ pull-up; mismatched threshold may cause premature reset in 3.3V systems | Choose MAX6326UR28+T for exact 2.80V trip point, push-pull drive, and sub-1µA current in space-constrained designs |
Compared with MAX809TRD2+T and TPS3808G33DBVR, the MAX6326UR28+T delivers tighter threshold tolerance (±1.5% vs ±2%), lower ICC (1µA vs 2.5µA/1.8µA), and integrated push-pull drive - making it optimal for long-life, precision-reset, and component-count-sensitive applications.
Availability
MAX6326UR28+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and smart metering endpoints requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6326UR28+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 demanding industrial, medical, and communications applications.
The MAX6326 family targets ultra-low-power microprocessor reset supervision in battery-operated and thermally challenging environments, emphasizing accuracy, reliability, and minimal external component count.
FAQ
What is the exact reset threshold voltage of MAX6326UR28+T and its tolerance?
The MAX6326UR28+T has a factory-trimmed nominal reset threshold of 2.80V, with ±1.5% tolerance at +25°C and ±2.5% over the full -40°C to +85°C operating range. This value is confirmed in Table 1 of the official datasheet and applies specifically to the "R28" suffix variant. The MAX6326UR28+T uses this precise threshold to ensure deterministic reset behavior in 3.3V systems approaching brownout conditions.
Does MAX6326UR28+T require an external pull-up resistor on the RESET pin?
No, the MAX6326UR28+T features a push-pull output that actively drives both high and low states, eliminating the need for an external pull-up resistor. When RESET is deasserted, the output sources current (VOH ≥ 0.8·VCC at 500µA); when asserted, it sinks current (VOL ≤ 0.3V at 1.6mA). This design reduces BOM cost and improves noise immunity compared to open-drain alternatives - a key feature of the MAX6326UR28+T.
What is the minimum VCC voltage at which MAX6326UR28+T remains functional?
The MAX6326UR28+T is guaranteed to maintain correct reset state down to VCC = 1.2V over the full -40°C to +85°C temperature range, and functions reliably as low as 1.0V at 0°C to +70°C. This extended low-voltage operation allows the MAX6326UR28+T to supervise deeply discharged batteries and ultra-low-power subsystems where other supervisors fail to assert reset correctly.
How does MAX6326UR28+T handle fast VCC transients or noise?
The MAX6326UR28+T incorporates internal filtering and comparator hysteresis (6.3mV) to reject fast VCC transients - it ignores glitches ≤20µs wide when overdriven by 200mV below threshold, as shown in the Typical Operating Characteristics graph "Maximum Transient Duration vs. Reset Threshold Overdrive". This immunity prevents false resets in electrically noisy environments, a core design attribute of the MAX6326UR28+T.
Is MAX6326UR28+T pin-compatible with legacy Maxim reset ICs like MAX809?
Yes, the MAX6326UR28+T is pin-compatible with MAX809 series devices in SOT23-3 package - same pinout (VCC, RESET, GND), identical footprint, and compatible voltage levels. However, the MAX6326UR28+T offers superior specs: 1µA vs 2.5µA supply current, tighter threshold tolerance, and guaranteed operation down to 1.2V - making it a performance-enhanced drop-in upgrade for existing MAX809-based designs.
MAX6326UR28+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:
- 2.8V
- 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
MAX6326UR28+T FAQ
1.How can I place an order for MAX6326UR28+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6326UR28+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 MAX6326UR28+T reliable?
The price and inventory of MAX6326UR28+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6326UR28+T is usually 5 days.
3.What payment methods are accepted for MAX6326UR28+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6326UR28+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6326UR28+T?
MAX6326UR28+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6326UR28+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 MAX6326UR28+T?
For technical support, including MAX6326UR28+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6326UR28+T requirements.
6.How does Aetrix verify that MAX6326UR28+T is sourced from the original manufacturer or authorized distributors?
All MAX6326UR28+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 MAX6326UR28+T meets industry standards.
7.What is the process for return or replacement of MAX6326UR28+T?
All MAX6326UR28+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6326UR28+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 MAX6326UR28+T part is unused and in its original packaging.
Return procedure for MAX6326UR28+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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