MAX809REUR

MAX809REUR is a Maxim Integrated (now Analog Devices) microprocessor supervisory circuit. It functions as a voltage monitor and reset generator for microcontrollers and other digital ICs: it watches the supply voltage and holds (or asserts) a reset signal until Vcc is stable, then releases reset when the voltage is within range. The MAX809 family offers fixed-threshold versions with a defined power-on reset delay, plus a manual reset input for external control. The output is a CMOS/TTL-compatible reset signal (typically active-low) suitable for MCU reset pins. Features often include low quiescent current, small package options, and operation over a wide temperature range. The MAX809REUR suffix denotes a specific packaging/ordering option (e.g., tape-and-reel and RoHS-compliant). For exact threshold voltage, delay, pinout, and packaging, refer to the MAX809 datasheet and the specific REUR ordering guide.

Equivalent products to MAX809REUR (voltage supervisor/reset) include:
- TI TLV803/TLV803B family
- TI TPS3808/TPS3809 family
- Microchip MCP1316/MCP1317
These are common cross-references for similar 3–5 V voltage supervisors with reset outputs. Exact threshold, reset delay, and package vary, so check datasheets and cross-reference tables for your target conditions and footprint.

MAX809REUR is a fixed-threshold microprocessor reset supervisor. Key features include:
- Fixed threshold reset monitor (threshold value variant-specific; common options cover 4.63V for 5V rails and 2.93V for 3.3V rails).
- Reset output is asserted when Vcc falls below threshold or on manual reset; resets released when Vcc is valid.
- Manual reset input with debounce (push-button reset).
- Power-on reset ensures a valid reset during Vcc ramp.
- Very low quiescent current for battery-powered apps.
- Fast, clean reset with built-in glitch protection.
- Wide operating range and RoHS-compliant packaging (REUR variant).

- Pin count: 8 pins (DIP-8/SO-8 package)
- Function: Microprocessor reset supervisor/voltage monitor. It monitors Vcc and asserts a reset signal to a microcontroller when the supply falls below its threshold, and releases reset after the supply is stable; often includes a manual reset input as well.

- Manufacturer: Maxim Integrated Products (now part of Analog Devices, Inc.).
- What kind of company: A global semiconductor company that designs and manufactures analog, mixed-signal, and power-management integrated circuits.

MAX809REUR is a voltage-supply supervisor that asserts a reset when the supply falls below its threshold and during power-up. Typical applications:
- Reset generation for microcontrollers, microprocessors, FPGAs, and DSPs in 3V–5V systems
- Power-on/brown-out reset protection in embedded, automotive, and industrial electronics
- Reset supervision in battery-powered and portable devices for reliable startup
- Digital consumer electronics (routers, set-top boxes, printers) requiring deterministic reset on supply changes

MAX809REUR is an 8-pin RoHS (lead-free) package, typically an SOIC/SOP-style surface-mount package.