Product Overview: PCA8574TS - NXP

The PCA8574TS is a robust, versatile 8-bit I/O expander from NXP Semiconductors designed to provide a seamless interface between the microcontrollers and peripheral devices. This I/O expander uses the I²C-bus interface, which is widely recognized for its simplicity and efficiency in connecting multiple devices with just two wires, making it an ideal choice for extending the I/O capabilities of microcontrollers with a minimal number of pins.

Key Features

• I²C Interface: The PCA8574TS operates as a slave device on the I²C-bus, allowing for easy serial communication with a variety of microcontrollers and processors.
• 8-bit Remote I/O Ports: Each PCA8574TS provides an additional eight I/O ports that can be configured as inputs or outputs, enhancing the flexibility of the host microcontroller.
• Interrupt Output: An interrupt output pin is included, which can be activated when there is a change in the logic state of the input ports, providing an efficient way to signal the host microcontroller without requiring constant polling.
• Low Standby Current: The device is optimized for low power consumption, making it suitable for battery-operated applications.
• Address Pins: Three hardware address pins allow up to eight PCA8574TS devices to share the same I²C-bus, offering the possibility to expand I/Os up to 64 additional ports.

Applications

The PCA8574TS is widely used in a range of applications where there is a need to expand the I/O capabilities of microcontrollers. It is particularly useful in:

• Industrial control systems
• Servers
• Home automation systems
• Robotics
• Medical equipment

Technical Specifications

• Operating Voltage: 2.5V to 6V
• I²C-bus to Parallel Port Expander
• 400 kHz I²C-bus interface (Fast-mode)
• Power-down mode
• Internal power-on reset
• Noise filter on SDA/SCL inputs
• ESD protection exceeds 2000 V HBM per JESD22-A114, and 1000 V CDM per JESD22-C101
• Latch-up testing is done to JESDEC Standard JESD78 which exceeds 100 mA
• Packaged in a TSSOP16 (thin shrink small outline package)

The PCA8574TS is a testament to NXP's commitment to providing innovative solutions that enhance system performance while minimizing design complexity and cost.