PCA9505DGG,112

Overview

The PCA9505DGG,112 is a 40-bit I/O expander for I2C-bus applications, organized in five banks of eight I/Os. It operates within a supply voltage range of 2.3 V to 5.5 V and supports standard mode (100 kHz) and fast mode (400 kHz). The device features 5.5 V tolerant I/Os with outputs capable of sourcing 10 mA and sinking 15 mA. It includes an active LOW output enable pin, an open-drain interrupt output, and an active LOW reset input. Three address select pins allow up to eight devices on the same bus. The PCA9505 variant specifically includes 100 kΩ internal pull-up resistors on all I/Os.

Feature Summary

• Provides 40 configurable I/O pins that default to inputs at power-up
• Includes 100 kΩ internal pull-up resistors on all I/O ports
• Features an active LOW output enable pin to 3-state all outputs
• Supports live insertion with IOFF circuitry and power-up 3-states

Applications

• Servers
• RAID systems
• Industrial control
• Medical equipment
• PLCs

Procurement Notes

Verify the specific ordering suffix ',112' against official NXP documentation to confirm packaging details such as tape and reel specifications or moisture sensitivity level. Ensure the TSSOP56 package version matches the required board layout dimensions and thermal performance criteria for the target application environment.

Selection Notes

Select this component when 40 digital I/O lines are required via a single I2C interface. Choose the PCA9505 over the PCA9506 if internal 100 kΩ pull-ups are desired to simplify external circuit design for input pins. Ensure the system voltage falls within the 2.3 V to 5.5 V range and that the I2C bus speed does not exceed 400 kHz.

Part Context

This part belongs to the PCA9505/PCA9506 family of 40-bit I/O expanders. It shares identical functionality with the PCA9506 except for the presence of internal pull-up resistors. Both devices offer similar register structures, interrupt handling, and live insertion capabilities, differing primarily in static power consumption characteristics due to the internal pull-ups.

Replacement Considerations

The PCA9506DGG is a functional alternative but lacks internal pull-ups. Verify if external pull-up resistors can be added to the PCB design. Other families like the PCA953x series require significant software and hardware redesign due to different register maps and I/O counts.