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Analog Devices Inc./Maxim Integrated MAX809REUR-T
- Part No.:
- MAX809REUR-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MAX809REUR-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,986
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Product details
Overview
MAX809REUR-T from Maxim Integrated is a 3-pin SOT23-packaged microprocessor supervisory circuit with push-pull active-low RESET output, 2.63V reset threshold (±1.5% over −40°C to +105°C), 140ms minimum reset timeout, 12μA supply current at +25°C, and guaranteed operation down to VCC = 1V. It monitors +2.5V/+3.0V/+3.3V/+5V power rails in embedded controllers and portable equipment.
For engineers reviewing the MAX809REUR-T datasheet, MAX809REUR-T pinout, MAX809REUR-T application, or MAX809REUR-T equivalent, this device delivers precision brownout detection, transient-immune reset assertion, low-power operation for battery-sensitive designs, and direct interface to μP reset inputs without external components.
Technical Context
The MAX809REUR-T integrates a precision voltage comparator with temperature-compensated reference (30ppm/°C) and an internal timer that guarantees ≥140ms reset pulse width after VCC rises above 2.63V. Its push-pull output drives CMOS/TTL logic directly without pullup resistors.
Designed for single-supply monitoring, it asserts RESET when VCC falls below 2.63V and holds it active until VCC remains above threshold for ≥140ms. The comparator ignores transients ≤20μs (at 100mV overdrive), and RESET remains valid down to VCC = 1V - ensuring deterministic behavior during deep brownout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±1.5% (−40°C to +105°C); ensures reliable reset assertion before critical μP voltage margin violation |
| Reset Timeout | 140ms min (−40°C to +85°C); guarantees sufficient hold time for full μP initialization |
| Supply Current | 17μA typ at +25°C, VCC = 3.0V; enables multi-year battery life in portable instrumentation |
| Operating Voltage Range | 1.2V to 5.5V (−40°C to +105°C); supports wide-input systems including Li-ion and regulated 3.0V rails |
| Output Type | Push-pull active-low RESET; eliminates need for external pullup and simplifies PCB layout |
| VCC Immunity | Valid RESET output down to VCC = 1V; prevents floating reset state during deep undervoltage |
| Transient Rejection | Immune to VCC glitches ≤20μs at 100mV overdrive; avoids spurious resets in noisy environments |
Pinout & Package
MAX809REUR-T uses a 3-pin SOT23 package (JEDEC MO-178AA), with 1.3mm × 2.9mm footprint, 0.95mm height, and gull-wing leads. Thermal resistance θJA = 250°C/W; continuous power dissipation = 320mW at +70°C (derates 4mW/°C above).
| 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 < 2.63V); actively pulls high when deasserted - no external pullup required |
| 3 (VCC) | Supply input | Monitored power rail input; powers internal circuitry and defines reset threshold reference point |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.63V threshold | ±1.5% tolerance over full temperature range ensures consistent brownout detection across operating conditions |
| 140ms minimum reset pulse | Guaranteed hold time exceeds μP power-on requirements for ARM Cortex-M0/M3 and PIC16/18 families |
| 12–17μA supply current | Enables >10-year battery life in coin-cell-powered sensors and handheld test equipment |
| VCC = 1V reset validity | Prevents undefined logic states on μP reset pins during deep brownout, eliminating need for external pull-down |
| Transient immunity | Rejects <20μs negative VCC spikes - reduces false resets in automotive and industrial switching environments |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
|
Use Scenario: PLC I/O modules powered from 3.0V DC-DC converters subject to load-step-induced brownouts. IC Role / Device Role / Timing Role: Monitors 3.0V rail and asserts active-low RESET to ARM-based controller until stable for ≥140ms. Use Value: Prevents firmware corruption during field-deployed maintenance cycles where input voltage sags to 2.7V. |
Use Scenario: Handheld glucose meters using CR2032 coin cells whose voltage drops from 3.0V to 2.2V over service life. IC Role / Device Role / Timing Role: Detects crossing of 2.63V threshold and holds μC in reset until battery is replaced or recharged. Use Value: Eliminates erratic display behavior and data loss during end-of-life battery discharge. |
| Automotive Body Control Modules | Smart Energy Meters |
|
Use Scenario: 12V-to-3.3V converted supply in BCM experiencing cold-crank transients down to 6V (3.3V rail sagging to 2.5V). IC Role / Device Role / Timing Role: Supervises 3.3V domain and triggers hardware reset before CAN controller enters undefined state. Use Value: Meets AEC-Q100 Grade 2 requirements via validated −40°C to +105°C operation and transient robustness. |
Use Scenario: Revenue-grade meter with isolated RS-485 interface requiring deterministic startup after AC power interruption. IC Role / Device Role / Timing Role: Ensures MSP430F5xx μP completes flash checksum and RTC initialization before enabling metrology ADC. Use Value: Guarantees accurate energy accumulation from first sample post-power-restoration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G12DBVR | 2.93V fixed threshold; 350ms reset timeout; 1.4μA quiescent current; requires external capacitor for timeout adjustment | Higher threshold unsuitable for 3.0V systems; longer timeout may delay system recovery unnecessarily | Select only if 2.93V threshold aligns with system VCC margin and extended timeout is acceptable |
| STM809RWDY6F | 2.63V threshold; open-drain output; 140ms timeout; 20μA ICC; SC70-3 package only | Open-drain output requires pullup resistor; SC70 footprint incompatible with SOT23-layouted boards | Choose only when board space constraints favor SC70 or bidirectional reset interface is required |
Compared with MAX809REUR-T, TPS3808G12DBVR offers lower current but higher threshold and non-standard timeout, while STM809RWDY6F matches threshold but lacks push-pull drive and requires layout change - making MAX809REUR-T optimal for drop-in 3.0V SOT23 designs needing minimal BOM and layout impact.
Availability
MAX809REUR-T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, and automotive body electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX809REUR-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 industrial, automotive, and computing applications, with emphasis on reliability, low power, and integration.
The MAX809 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for deterministic power-on/brownout reset generation in space-constrained, low-power embedded systems.
FAQ
What is the exact reset threshold voltage of MAX809REUR-T and how tightly is it specified?
The MAX809REUR-T has a nominal reset threshold of 2.63V, with ±1.5% tolerance guaranteed over the full operating temperature range of −40°C to +105°C. This specification is confirmed in the Electrical Characteristics table under "Reset Threshold" for MAX809R variants, and applies directly to the MAX809REUR-T due to its /R suffix and EUR (SOT23) package designation.
Does MAX809REUR-T require an external pullup resistor on the RESET pin?
No, MAX809REUR-T does not require an external pullup resistor because it features a push-pull active-low RESET output. Unlike open-drain variants (e.g., MAX803R), the MAX809REUR-T actively drives both high and low states, enabling direct connection to standard CMOS/TTL reset inputs without additional components.
Can MAX809REUR-T operate reliably when VCC drops below 2.0V?
Yes, MAX809REUR-T guarantees valid RESET output down to VCC = 1.0V. Below 1.0V, the output becomes high-impedance, but within the 1.2V to 5.5V specified operating range - including 1.5V and 1.8V rails - RESET remains fully functional and asserted correctly during brownout.
What is the minimum reset pulse width guaranteed by MAX809REUR-T across temperature?
MAX809REUR-T guarantees a minimum reset pulse width of 140ms over −40°C to +85°C, and 100ms over +85°C to +105°C. This timing is internally generated and independent of external components, ensuring μP initialization completes even under worst-case thermal conditions.
Is MAX809REUR-T qualified for automotive applications?
No, MAX809REUR-T is rated for −40°C to +105°C operation but is not AEC-Q100 qualified. For automotive use, select MAX809REUR/V+T (with /V suffix), which carries AEC-Q100 Grade 2 qualification and is explicitly listed in the Ordering Information section as automotive-qualified.
MAX809REUR-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:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MAX809REUR-T FAQ
1.How can I place an order for MAX809REUR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX809REUR-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 MAX809REUR-T reliable?
The price and inventory of MAX809REUR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX809REUR-T is usually 5 days.
3.What payment methods are accepted for MAX809REUR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX809REUR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX809REUR-T?
MAX809REUR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX809REUR-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 MAX809REUR-T?
For technical support, including MAX809REUR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX809REUR-T requirements.
6.How does Aetrix verify that MAX809REUR-T is sourced from the original manufacturer or authorized distributors?
All MAX809REUR-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 MAX809REUR-T meets industry standards.
7.What is the process for return or replacement of MAX809REUR-T?
All MAX809REUR-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX809REUR-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 MAX809REUR-T part is unused and in its original packaging.
Return procedure for MAX809REUR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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