Overview
The PCF8574DWE4, produced by Texas Instruments, is a remote 8-bit I/O expander designed for use with the I2C bus. This device provides general-purpose remote I/O expansion for most microcontroller families, operating within a voltage range of 2.5V to 6V. It is particularly useful in applications where additional I/O ports are needed without the complexity of adding more microcontrollers.
Key Specifications
| Parameter | Value |
|---|---|
| I2C Address | 0100 xxx |
| Max Frequency | 100 kHz |
| Number of I/Os | 8 |
| Operating Temperature Range | -40°C to 85°C |
| Package Type | SOIC (16 pins) |
| Package Dimensions | 10.3 mm x 7.5 mm x 2.35 mm |
| VCC (Max) | 6 V |
| VCC (Min) | 2.5 V |
| Supply Current (typical at 100 kHz) | VCC dependent, see datasheet for details |
Key Features
- 8-bit quasi-bidirectional I/O port (P0–P7) with latched outputs and high-current drive capability for directly driving LEDs.
- Open-drain interrupt output (INT) that can be connected to the interrupt input of a microcontroller.
- Compatible with most microcontroller families via the I2C interface (serial clock, SCL, and serial data, SDA, pins).
- Operating voltage range of 2.5V to 6V.
- No need for a data-direction control signal; each I/O can be used as an input or output.
- Power-on reset feature.
Applications
- Telecom shelters: Filter units.
- Servers and routers (telecom switching equipment).
- Personal computers and personal electronics.
- Industrial automation.
- Products with GPIO-limited processors.
Q & A
- What is the PCF8574DWE4 used for?
The PCF8574DWE4 is used for remote 8-bit I/O expansion via the I2C bus, providing additional I/O ports for microcontrollers.
- What is the operating voltage range of the PCF8574DWE4?
The operating voltage range is 2.5V to 6V.
- How many I/O ports does the PCF8574DWE4 have?
The device has 8 quasi-bidirectional I/O ports.
- What is the maximum frequency of the I2C interface for the PCF8574DWE4?
The maximum frequency is 100 kHz.
- What types of applications is the PCF8574DWE4 suitable for?
It is suitable for telecom shelters, servers, routers, personal computers, personal electronics, industrial automation, and products with GPIO-limited processors.
- Does the PCF8574DWE4 have an interrupt feature?
Yes, it has an open-drain interrupt output (INT) that can be connected to the interrupt input of a microcontroller.
- What is the package type of the PCF8574DWE4?
The package type is SOIC (16 pins).
- What are the dimensions of the PCF8574DWE4 package?
The dimensions are 10.3 mm x 7.5 mm x 2.35 mm.
- Is the PCF8574DWE4 compatible with most microcontrollers?
Yes, it is compatible with most microcontroller families via the I2C interface.
- Does the PCF8574DWE4 require a data-direction control signal for its I/O ports?
No, each I/O can be used as an input or output without the need for a data-direction control signal.
