PCA8575DB,118

I/o Expanders Overview

The PCA8575DB,118 is a remote 16-bit I/O expander for the I2C-bus with an interrupt output. It provides general-purpose remote I/O expansion for microcontroller families via the two-line bidirectional I2C bus (SCL and SDA). The device features a 16-bit quasi-bidirectional port and operates within a supply voltage range of 2.3 V to 5.5 V, supporting 5.5 V tolerant I/Os. It includes latched outputs with a 25 mA sink capability per bit and a total package sink capability of 400 mA. The component supports a maximum clock frequency of 400 kHz and offers eight programmable slave addresses using three address pins. It functions across an operating temperature range of -40 °C to +85 °C.

I/o Expanders Feature Summary

• Provides 16-bit remote I/O expansion via a standard two-line bidirectional I2C interface.
• Features active LOW open-drain interrupt output to signal incoming data without continuous bus communication.
• Includes internal Power-On Reset (POR) that initializes all I/Os as inputs upon power application.

I/o Expanders Applications

• LED signs and displays
• Industrial control systems
• Medical equipment
• Programmable Logic Controllers (PLCs)
• Servers

I/o Expanders Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and availability status. Confirm RoHS compliance details directly from the official datasheet before procurement. Ensure the selected variant matches the required SSOP24 package dimensions and lead pitch specifications for the target PCB layout.

I/o Expanders Selection Notes

Select this component when a system requires expanding microcontroller GPIO capabilities over an I2C bus. It is suitable for applications needing high-current drive for LEDs or direct interfacing with external logic. Consider the 5.5 V tolerance for mixed-voltage environments and the interrupt feature for efficient event-driven polling in embedded designs.

I/o Expanders Part Context

The PCA8575DB,118 belongs to the NXP PCA8575 family of 16-bit I/O expanders. This family includes variants with different packages such as SO24, TSSOP24, and HVQFN24. The DB suffix specifically denotes the SSOP24 plastic shrink small outline package. These devices are designed as drop-in replacements for similar legacy components while offering enhanced electrical characteristics.

I/o Expanders Replacement Considerations

The PCA8575 serves as a drop-in replacement for the PCF8575 without requiring electrical or software modifications. Note that interrupt output release timing differs during read operations between these two devices. Verify compatibility if existing firmware relies on specific interrupt clearing behaviors associated with the PCF8575 architecture.