PCF8575TS/1,112

I/o Expanders Overview

The PCF8575TS/1,112 is a silicon CMOS remote 16-bit I/O expander for the I2C-bus. It provides general-purpose expansion via two bidirectional lines (SDA and SCL). The device features a 16-bit quasi-bidirectional port with latched outputs capable of directly driving LEDs. It supports an operating supply voltage range of 2.5 V to 5.5 V and includes an open-drain interrupt output (INT) that signals microcontrollers upon input state changes. Addressing is configured by three hardware pins (A0, A1, A2), allowing up to eight devices on a single bus. The component operates at FAST I2C-bus speeds up to 400 kbits/s and is housed in an SSOP24 package.

I/o Expanders Feature Summary

• Provides 16-bit remote I/O expansion using a standard two-line I2C interface
• Features quasi-bidirectional ports with latched outputs for direct LED driving
• Includes an open-drain interrupt output to notify the master controller of input events
• Supports multiple device addressing through three hardware address pins

I/o Expanders Applications

• Remote I/O expansion for microcontroller families
• Direct LED driving applications
• Systems requiring interrupt-driven input monitoring

I/o Expanders Procurement Notes

Verify the specific ordering suffix '1,112' against current manufacturer documentation to confirm packaging details and compliance status. Ensure the SSOP24 package variant matches the required board layout constraints. Cross-reference the datasheet revision date to validate electrical characteristics against the intended application environment.

I/o Expanders Selection Notes

Select this component when a system requires expanding GPIO capabilities beyond the native limits of the host microcontroller. It is suitable for designs needing low standby current consumption and compatibility with various logic voltage levels within the specified supply range. Consider the interrupt feature if asynchronous input detection is required without continuous polling.

I/o Expanders Part Context

The PCF8575 series serves as a remote I/O expander for I2C-bus systems. Originally developed by Philips Semiconductors, these components are now part of NXP's portfolio. The TS designation indicates the SSOP24 plastic shrink small outline package. This family allows designers to add significant digital I/O capacity while minimizing PCB trace count.

I/o Expanders Replacement Considerations

PCAL9673: Offers higher drive capability and Fm+ speed.