PCA9557DBR

I/o Expanders Overview

The PCA9557DBR 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 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. The device features an open-drain output type with current drive capabilities of 10 mA sink and 25 mA source. It is housed in a 16-pin SOIC package (0.154 inch width) and functions across a temperature range of -40°C to +85°C. Key internal features include configuration registers and power-on reset (POR) functionality, enabling flexible pin direction control without external components.

I/o Expanders Feature Summary

• Supports standard I2C and SMBus communication protocols for system integration
• Includes configuration registers to define input or output directions per pin
• Integrates power-on reset circuitry to ensure defined initial states

I/o Expanders Applications

• Portable battery-powered equipment requiring low standby current
• Systems needing additional general-purpose I/O lines via serial interfaces
• Embedded controllers expanding GPIO capabilities for peripheral management

I/o Expanders Procurement Notes

Verify the specific suffix 'DBR' corresponds to the tape-and-reel packaging format when sourcing. Confirm that the operating voltage requirements align with the 2.3 V to 5.5 V specification. Ensure compatibility with the host controller's I2C bus speed limits before finalizing procurement decisions.

I/o Expanders Selection Notes

Select this component when an 8-bit expansion is required with I2C connectivity. Compare against the PCA9557DR if different packaging options are needed. Consider the PCA9554 series if interrupt output support is necessary for event-driven applications instead of polling.

I/o Expanders Part Context

This part belongs to the PCA9557 family of low-power I/O expanders. It shares core electrical specifications with variants like the PCA9557D but differs in packaging and reel configuration. The family is designed for applications where space and power consumption are critical constraints.

I/o Expanders Replacement Considerations

The PCA9557DR serves as a direct functional substitute with identical electrical characteristics. Verify package dimensions and pinout compatibility before swapping between SOIC variants.