MAX811REUS+T

MAX811REUS+T is a Maxim microprocessor supervisory (voltage‑monitor) circuit. It monitors the supply voltage and generates a clean, known reset signal for a microcontroller or digital IC to ensure proper startup and brown‑out protection.
Key points
- Reset output: active low; asserts when Vcc falls below the chosen trip threshold and remains asserted during power‑up until the supply is stable.
- Power‑on reset: includes a defined delay after Vcc crosses the threshold to guarantee a safe MCU startup.
- Manual reset: usually a reset input (MR) to force a reset regardless of Vcc.
- Low quiescent current and fast response; designed for 2.7–5.5 V operation (variants exist with different thresholds; check the datasheet for exact trip voltages).
- REUS+T suffix indicates a specific packaging/lead‑free RoHS compliant variant (Tape & Reel). Packaging details and temperature range are in the datasheet.
Typical use
- Place MAX811 between Vcc and GND, connect MR as needed, and feed the MCU Reset input with the MAX811’s reset output. Choose the variant that matches your MCU’s operating voltage and desired trip point. For exact specs, consult the MAX811 datasheet.

Equivalent products to MAX811REUS+T are other vendors’ microprocessor supervisory/reset ICs with similar voltage monitor and reset features, such as:
- TI TLV803/TLV803B family
- TI TPS3808/TPS3810 family
- Microchip MCP1315/1316/1317 series
- ON Semiconductor NCP301/NCP306/NCP431 family
Note: check exact supply thresholds, watchdog/reset behavior, and package compatibility for your design.

Key features of MAX811REUS+T (Microprocessor supervisory circuit with watchdog):
- Supply range: 2.7V to 5.5V (typical for MCU supervision)
- Reset output: active-low reset (RESET#) with guaranteed power-on reset
- Manual reset input: push-button capable (active-low) with debounce
- Watchdog timer: external watchdog input (WDI) to prevent software lockups
- Threshold options: fixed voltage-detection thresholds available across device variants
- Very low quiescent current
- Extended temperature option (fits -40°C to +125°C variants)
- 8-pin package compatible with standard PCB layouts
- RoHS-compliant/pb-free; Tape & Reel packaging variant available (+T)
Note: Detailed exact thresholds, delay times, and output current specs vary by exact variant; consult the datasheet for the MAX811 family to select the precise version (e.g., VTH and POR delay) for your design.

- Pin count: 8 pins (8-pin µSOP/SOIC package, MAX811REUS+T).
- Function: Microprocessor reset supervisor. It monitors Vcc and asserts an active-low reset output during power-up/power-down or when Vcc drops below the threshold; includes a manual reset input and an open-drain reset output.

Manufacturer: Analog Devices, Inc. (the MAX811 line originated with Maxim Integrated; Maxim was acquired by Analog Devices in 2021).
What kind of company: Analog Devices is a multinational semiconductor company that designs, manufactures, and markets analog, mixed-signal, and digital signal processing (DSP) integrated circuits for electronics.

MAX811REUS+T is a microprocessor supervisory circuit with power-on reset, brown-out protection and optional watchdog/manual reset. Applications include:
- Reset generation for MCUs/digital ICs during power-up/power-down
- Brown-out/supply supervision in embedded systems
- Watchdog-enabled control in portable/industrial electronics
- Manual reset input for safe restart
- Digital systems requiring a deterministic reset signal (MCU, FPGA, DSP, data acquisition)
Suitable for 5V/3.3V systems and other embedded designs needing reliable reset during voltage fluctuations.

8-pin µSOP (µSOP-8) package, RoHS-compliant, supplied in Tape & Reel.