MAX809JEUR+T

MAX809JEUR+T is Maxim’s MAX809 microprocessor supervisor (voltage monitor) in an 8-pin RoHS package with Tape & Reel packaging (+T). It provides a clean, known reset for a microcontroller when power is applied or the supply falls out of spec.
Key points:
- Monitors Vcc and asserts an active-low RESET output when the supply is out of range.
- Reset timing is set by an external capacitor, giving a defined power-on reset window.
- Includes a manual reset input for forcing a reset (useful for testing or external control).
- Available in multiple threshold options to match 5V, 3.3V, etc. rails.
- Very low quiescent current, suitable for embedded applications.
Typical use: power-on reset for MCUs/SoCs, ensuring proper startup and preventing erratic behavior during power glitches. For exact thresholds, timing, pinout, and packaging details, refer to the MAX809 datasheet.

Equivalent reset-supervisor parts to MAX809JEUR+T (voltage detector with reset) include:
- TI TLV803 / TLV803B (fixed thresholds, e.g., 2.63/2.93/3.08 V)
- Analog Devices ADM803 / ADM803A
- Microchip MCP1316 / MCP1317 family
- ON Semiconductor NCP803 / NCP803A
All are 3-pin microprocessor supervisors with an active-low reset output. Choose the variant with the same reset-threshold as MAX809’s 3.0V option and matching timing/package needs.

Here are the typical features of the MAX809JEUR+T (MAX809 family) in concise form:
- Single-supply operation: typically 2.7V–5.5V (supplies a wide range of microcontrollers).
- Fixed voltage-threshold monitors (selectable variants across the MAX809 family; for 5V systems a 4.63V threshold is common; other options exist for lower rails).
- Power-on reset and brown-out protection: ensures a defined reset pulse while powering up or when Vcc collapses.
- Reset output: active-low reset (RESET#) with drive suitable to MCU reset pins (often push-pull; some variants offer open-drain).
- Manual reset input: MR/RESET# to force a reset externally.
- Very low quiescent current (specially suited for battery-powered apps).
- Small 8-pin package options; Tape & Reel (+T) packaging available.
- Extended temperature option: JEUR package with industrial-grade temp range (typically -40°C to +125°C).
Note: exact thresholds, output type, and temp range depend on the specific MAX809 variant chosen.

- Pin count: 8 pins (8-pin package, e.g., SO-8/DIP-8; packaging code +T indicates tape-and-reel).
- Function: Microprocessor reset supervisor with voltage monitor. It monitors Vcc and generates an reset signal to a microcontroller (power-on/power-down brown-out protection). Typically provides an active-low reset output and may include a manual reset input depending on variant.

- Manufacturer: Maxim Integrated (now part of Analog Devices).
- Company type: A global semiconductor company that designs and manufactures analog and mixed-signal integrated circuits (e.g., voltage supervisors, power-management ICs) for a wide range of applications.

Typical applications for MAX809JEUR+T (microprocessor supervisory circuit):
- Microcontroller/microprocessor reset supervision for reliable startup
- FPGA/ASIC reset distribution
- Power-on reset and brown-out protection in automotive ECUs, industrial controllers, and telecom equipment
- Consumer electronics (set-top boxes, cameras, etc.)
- Data acquisition and medical devices requiring deterministic reset on supply variation
- Battery-powered systems needing reset on power loss or rail fluctuations
These uses ensure proper initialization and safe operation during power-up, power-down, and voltage dips.

An 8-pin small‑outline IC (SOIC) package, RoHS‑compliant; “+T” indicates tape‑and‑reel packaging.