PCA9557PW

I/o Expanders Overview

The PCA9557PW is a remote 8-bit I2C and SMBus low-power I/O expander manufactured by Texas Instruments. It operates within a supply voltage range of 2.5 V to 6 V and supports clock frequencies up to 400 kHz. The device features eight general-purpose digital input/output pins and includes configuration registers for setting pin directions. It is housed in a TSSOP-16 surface-mount package and functions reliably across an operating temperature range of -40°C to +85°C.

I/o Expanders Feature Summary

• Provides eight bidirectional digital I/O channels accessible via standard I2C or SMBus protocols
• Includes internal configuration registers to define individual pin input or output states
• Operates with low power consumption suitable for battery-powered applications

I/o Expanders Applications

• Remote I/O expansion for microcontrollers with limited pin counts
• Consumer electronics requiring additional control lines
• Industrial systems needing isolated digital signal interfacing

I/o Expanders Procurement Notes

Verify the specific suffix 'PW' corresponds to the TSSOP-16 package when sourcing. Confirm RoHS compliance status through official manufacturer documentation. Ensure the supplier provides valid traceability data for quality assurance purposes.

I/o Expanders Selection Notes

Select this component when an 8-bit I/O solution is required with I2C compatibility. Consider the TSSOP-16 footprint constraints during PCB layout. Verify that the system voltage aligns with the 2.5 V to 6 V operational range.

I/o Expanders Part Context

This part belongs to the PCA9557 series of I/O expanders from Texas Instruments. It shares functional similarities with other members like the PCA9557DR but differs in packaging. The series is designed for low-power digital interface expansion in embedded systems.

I/o Expanders Replacement Considerations

The PCA9557PWR is a reel-packaged variant of the same device. Cross-reference with NXP PCA9557 models for pin-compatible alternatives if sourcing from different manufacturers.