Inicio > Circuitos integrados IC > MAX811MEUS+T

MAX811MEUS+T

Microprocessor supervisor, 4.38V threshold, manual reset, SOT-23-5

8005

Inventario efectivo

Ir a la consulta

Image for reference only

Pieza del fabricante：

MAX811MEUS+T

Paquete：

SOT-23-5 (2.90 x 1.60 x 1.10 mm)

Marca：

Categorías de productos：

Circuitos integrados IC, Circuitos integrados de gestión de la alimentación (PMIC)

Otras recomendaciones que pueden interesarle.

SII9396SCNUC-BAR

IS43TR16256BL-125KBLI

Descripción

MAX811MEUS+T Overview

The MAX811MEUS+T is a 4-pin microprocessor reset supervisor from Analog Devices/Maxim with 4.38V reset threshold, manual reset input, only 5uA supply current, in a SOT-143 package, suitable for MCU power-on reset and voltage monitoring.

Key Features

Reset threshold: 4.38V
Reset output: Active low
Manual reset input
Supply current: 5uA
Reset timeout: 140ms (minimum)
Supply voltage: 1.2V-5.5V

Introducción del producto:MAX811MEUS+T Presentación del producto

The MAX811MEUS+T is a microprocessor supervisory circuit from Maxim Integrated (now Analog Devices), providing a precision reset output when the supply voltage drops below 4.38 V threshold. It features a manual reset input (MR), 140 ms minimum reset timeout, and an active-low reset output in a SOT-23-5 package. The device guarantees reset output valid to VCC = 1 V, ensuring proper system initialization during power-up and brownout conditions. With 2 uA supply current and no external components required, it is ideal for space-constrained embedded systems.

Principio de funcionamiento:MAX811MEUS+T Principio de funcionamiento

The MAX811MEUS+T continuously monitors the VCC supply voltage through an internal resistor divider and precision comparator. When VCC falls below the 4.38 V threshold (VIT-), the comparator triggers the reset generator, which drives the active-low RESET output low. The reset output remains low for a minimum of 140 ms after VCC rises above the threshold, allowing the microprocessor and power supply to stabilize before code execution begins. The manual reset (MR) input, when pulled low, triggers the same reset sequence regardless of VCC level. The MR input is debounced internally and includes an internal pull-up resistor. The open-drain reset output requires an external pull-up resistor when connected to active-high logic. The device is guaranteed to assert reset down to VCC = 1 V, ensuring reliable operation during deep brownout and power-down transients.

Descripción de la clavija:MAX811MEUS+T Definición y funciones de las clavijas

Pin	Nombre	Descripción
1	MR	Manual reset input; active low, internal 50 kOhm pull-up, debounce filtered
2	GND	Referencia del suelo
3	NC	No connect; leave floating
4	RESET	Active-low reset output; open-drain, requires external pull-up to VCC or logic rail
5	VCC	Supply voltage input; also serves as the monitored voltage (4.38 V threshold)

MAX811MEUS+T uses the 4-SOT-143 (US) surface-mount package with Pin 1 = GND, Pin 2 = RESET (active-low, push-pull output), Pin 3 = MR (Manual Reset input, active-low), Pin 4 = VCC. The “M” suffix denotes the 150ms reset timeout period. The RESET output is push-pull (not open-drain), eliminating the need for an external pull-up resistor. The MR pin has an internal 12kΩ pull-up resistor — connecting MR to GND through a momentary switch triggers a manual reset. The SOT-143 package is slightly wider than SOT-23 to accommodate the four pins. For active-high reset output, use MAX812 (same pinout, RESET output is active-high). For different timeout periods, ME=140ms, LE=1.12s, TE=200ms suffixes are available.

Application Scenarios:In which products and applications isMAX811MEUS+T usado

Microprocessor Reset: Ensuring reliable startup and brownout detection for 5 V microcontrollers and FPGAs
FPGA Configuration Control: Holding FPGA in reset during power supply ramp-up and transients
Board-Level Monitoring: System-wide reset generation for multi-IC embedded boards
Manual Reset Button: Debounced push-button reset for operator-controlled system restart
Power Supply Supervision: Detecting 5 V rail undervoltage in telecom and industrial equipment

Alternative Models:What chips are recommended as replacements for MAX811MEUS+T

Modelo	Fabricante	Threshold	Timeout	Paquete	Notas
MAX811LEUS+T	ADI/Maxim	4.63 V	140 ms	SOT-23-5	Higher threshold
MAX811TEUS+T	ADI/Maxim	3.08 V	140 ms	SOT-23-5	3.3 V system threshold
DS1811	ADI/Maxim	4.38 V	140 ms	SOT-23-5	Pin-compatible equivalent
TLC7733	Texas Instruments	3.08 V	200 ms	SOT-23-5	TI alternative, 3.3 V
ADM811MART-REEL7	Dispositivos analógicos	4.38 V	140 ms	SOT-23-5	ADI pin-compatible

MAX811MEUS+T is a 150ms reset supervisor from Maxim/ADI in SOT-143-4. The MAX812 provides active-high RESET output in the same package. The MCP130T from Microchip offers similar 4.38V threshold in SOT-23-3 with open-drain output. The TPS3839 from TI provides nanopower 150nA supply current in SOT-23-3. The CAT811 from onsemi offers the same function with CMOS push-pull output in SOT-143. For adjustable threshold, TLV803 from TI provides factory-programmable thresholds from 0.9V to 5.0V.