PCF8574ATS/3,118

I/o Expanders Overview

The PCF8574ATS/3,118 is an NXP remote I/O expander providing eight quasi-bidirectional ports via a two-wire bidirectional I2C bus. It operates between 2.5 V and 6 V with a 100 kHz interface speed. The device features three hardware address inputs for up to eight units per bus segment and includes an active LOW open-drain interrupt output. It offers low standby current of 2.5 µA typical and total package sink capability of 80 mA. Operating temperature ranges from -40 °C to +85 °C.

I/o Expanders Feature Summary

• Eight quasi-bidirectional I/O pins defaulting to inputs at power-up
• Active LOW open-drain interrupt output for input state change notification
• Low standby current consumption suitable for mobile applications
• Latch-up testing exceeding 100 mA per JEDEC standard JESD78

I/o Expanders Applications

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

I/o Expanders Procurement Notes

Verify the specific ordering suffix /3,118 against official documentation to confirm SSOP20 packaging and reel packing method. Ensure compatibility with system voltage requirements within the 2.5 V to 6 V range. Confirm address pin configurations match the required I2C slave addresses for the target application design.

I/o Expanders Selection Notes

Select this component when a cost-effective solution for expanding GPIO is needed without complex direction registers. The quasi-bidirectional architecture simplifies firmware by using a single register for both input and output operations. Consider the 80 mA total sink limit when designing high-current drive loads.

I/o Expanders Part Context

This part belongs to the PCF8574 family, which provides general-purpose remote I/O expansion. The 'A' variant in the model number indicates a different fixed portion of the slave address compared to the standard PCF8574, allowing both types to coexist on the same I2C bus. The TS/3 designation specifies the SSOP20 package type.

I/o Expanders Replacement Considerations

PCA9674 serves as a drop-in replacement offering higher Fm+ I2C speeds and increased drive capabilities. PCA9670 and PCA9672 provide alternative migration paths with hardware reset inputs instead of interrupt outputs.