PCA9557PWT - Texas Instruments

Manufacturer Part Number

PCA9557PWT

Manufacturer

Texas Instruments

Introduction

The PCA9557PWT is an 8-bit I/O expander for the two-line bidirectional bus (I2C or SMBus) designed to provide general-purpose remote I/O expansion for most microcontroller families.

Product Features and Performance

8-bit I/O expander

I2C and SMBus interface compatible

Power-on reset (POR) feature

Open drain and push-pull output types

Individual I/O configuration possible

Low standby-current consumption

Product Advantages

Reduces microcontroller pin usage

Flexible I/O expansion for various applications

Supports hot insertion

Noise filter on SDA and SCL inputs

Key Technical Parameters

Number of I/O: 8

Interrupt Output: No

Current Output Source/Sink: 10mA, 25mA

Clock Frequency: 400 kHz

Voltage Supply: 2.3V to 5.5V

Operating Temperature range: -40°C to 85°C

Quality and Safety Features

Integrated power-on reset

Low power consumption

Built-in hysteresis on I2C bus inputs for noise immunity

Compatibility

Compatible with I2C and SMBus standards

Multiple devices can be connected to the same bus

Application Areas

Servers

Personal electronics

Industrial controls

Medical equipment

Mobile devices

Product Lifecycle

Product Status: Obsolete

Consider alternatives or consult with manufacturer for latest replacement models

Key Reasons to Choose This Product

Texas Instruments' reputation for quality and reliability

I2C and SMBus compatibility allows for easy integration in most systems

Flexibility to configure I/O pins according to specific needs

Supports systems with a wide range of supply voltages for diverse applications

Suitable for both industrial-grade temperature requirements and consumer applications

Simplifies design and reduces costs by limiting the number of microcontroller pins needed