TCA9555RGER

Overview

The TCA9555RGER is a 16-bit I2C and SMBus I/O expander manufactured by Texas Instruments. It operates within a supply voltage range of 1.65 V to 5.5 V, supporting low-power applications. The device features two 8-bit configuration registers allowing individual pin direction selection. It includes an interrupt output pin for efficient event monitoring and configuration registers for polarity inversion. The component utilizes a VQFN-24 package suitable for surface mount installation. It supports clock frequencies up to 400 kHz and functions reliably across an operating temperature range from -40°C to +85°C.

Feature Summary

• Configurable input/output directions via dedicated configuration registers
• Interrupt output capability for asynchronous status notification
• Polarity inversion register for flexible signal logic handling

Applications

• Server systems requiring remote I/O expansion
• Telecommunication exchange equipment and routers
• Industrial automation control devices

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to confirm package type and tape/reel specifications. Ensure compatibility with system voltage levels between 1.65 V and 5.5 V. Confirm humidity sensitivity class requirements for storage and reflow soldering processes prior to procurement.

Selection Notes

Select this component when a 16-bit parallel interface expansion is required over an I2C or SMBus bus. The wide voltage range accommodates both low-voltage digital cores and 5V tolerant peripherals. Consider the VQFN-24 footprint constraints during PCB layout design. Verify that the interrupt line routing supports the open-drain output structure defined in the electrical characteristics.

Part Context

This part belongs to the TCA9555 family of remote I/O expanders. It shares functional similarities with the PCA9555 series but offers a lower minimum operating voltage of 1.65 V compared to the PCA9555's 2.3 V minimum. Both families provide 16-bit expansion with interrupt outputs and configuration registers, differing primarily in voltage tolerance specifications.

Replacement Considerations

The TCA9555RTWR serves as a direct replacement offering identical functionality in a WQFN-24 package. The TCA9555DBT provides the same electrical performance in an SSOP-24 package. Cross-package substitutions require verification of thermal dissipation and mechanical fit within the target enclosure.