PCA9539DBQR

I/o Expanders Overview

The PCA9539DBQR is a remote 16-bit I2C and SMBus low-power I/O expander manufactured by Texas Instruments. It operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. The device features an SSOP-24 package with 16 configurable input/output pins, each capable of sourcing or sinking 25 mA. It includes dedicated interrupt output, reset pin, and configuration registers for flexible system integration. The component functions reliably across an operating temperature range of -40°C to +85°C and provides 2 kV ESD protection.

I/o Expanders Feature Summary

• Configurable I/O ports allow individual selection of input or output functionality via internal configuration registers.
• Open-drain interrupt output signals state changes on input ports to the host processor without continuous polling.
• Hardware reset pin initializes the device state machine and registers independently of power cycling.

I/o Expanders Applications

• Remote I/O expansion in embedded systems requiring additional digital control lines
• Industrial control panels needing isolated input monitoring and output switching
• Consumer electronics utilizing I2C/SMBus interfaces for peripheral management

I/o Expanders Procurement Notes

Verify the specific suffix DBQR corresponds to the SSOP-24 tube packaging variant when ordering. Confirm that the intended application environment remains within the specified -40°C to +85°C operational temperature limits. Ensure the system voltage aligns with the 2.3 V to 5.5 V operating range to prevent functional anomalies. Check for RoHS compliance documentation if environmental regulations apply to the final assembly.

I/o Expanders Selection Notes

Select this component when a 16-bit expansion is required over the I2C or SMBus interface. Consider the SSOP-24 package dimensions against available PCB real estate. Evaluate the need for the specific interrupt and reset features compared to simpler expanders like the PCA9534. Verify that the 25 mA output current capability meets the load requirements for connected peripherals.

I/o Expanders Part Context

This part belongs to the PCA9539 series of low-power I/O expanders from Texas Instruments. It shares core functionality with variants such as the PCA9539DB and PCA9539PWR, differing primarily in package type and manufacturing lot specifications. The series is designed for applications requiring reliable remote I/O control with minimal power consumption.

I/o Expanders Replacement Considerations

The PCA9539PWR serves as a direct functional substitute using a TSSOP-24 package. The PCA9539RGER offers equivalent performance in a VQFN-24 footprint. Verify pin compatibility and thermal characteristics when transitioning between these package types.