PCA8574TS,112

I/o Expanders Overview

The PCA8574TS,112 is an 8-bit I/O expander for the I2C bus manufactured by NXP. It operates within a supply voltage range of 2.3 V to 5.5 V and supports a maximum clock frequency of 400 kHz. The device features eight quasi-bidirectional ports with latched outputs capable of sinking up to 25 mA per pin and 200 mA total package current. It includes three hardware address inputs allowing up to eight devices on one bus, an active LOW open-drain interrupt output, and operates between -40 °C and +85 °C. The typical static standby current is 4.5 µA.

I/o Expanders Feature Summary

• Provides remote I/O expansion via a two-wire bidirectional I2C interface
• Features quasi-bidirectional ports that function as inputs or outputs without direction control signals
• Includes an active LOW open-drain interrupt output triggered by input state changes
• Supports multiple devices on a single bus through three hardware address pins

I/o Expanders Applications

• LED signs and displays
• Industrial control systems
• Key pads
• Servers
• Medical equipment

I/o Expanders Procurement Notes

Verify the specific ordering suffix '112' against official documentation to confirm the packing method and reel specifications. Ensure the SSOP20 package variant matches the design requirements. Confirm RoHS compliance status and check for any specific environmental certifications required for the target application before finalizing procurement.

I/o Expanders Selection Notes

Select this component when an I2C-based solution is required for expanding GPIO capabilities in space-constrained designs. The SSOP20 package offers a compact footprint suitable for dense PCB layouts. Consider the 400 kHz Fast-mode I2C speed and the 25 mA sink capability if direct LED driving is necessary without external transistors.

I/o Expanders Part Context

This part belongs to the PCA8574 family, which serves as a drop-in replacement for the PCF8574 series. While functionally similar, the PCA8574 offers improved performance characteristics such as higher operating speed and increased drive current. It is designed to coexist with other expanders on the same I2C bus using distinct address maps.

I/o Expanders Replacement Considerations

The datasheet identifies the PCA9674 as a migration path offering higher speed and more addresses. For direct functional replacements within the same family, verify compatibility with the PCF8574TS/3 series, noting differences in I2C frequency and drive strength.