PCA9535D,112

I/o Expanders Overview

The PCA9535D,112 is a 24-pin CMOS device providing 16 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus and SMBus applications. It operates within an operating power supply voltage range of 2.3 V to 5.5 V and supports clock frequencies from 0 Hz to 400 kHz. The device features 5 V tolerant I/Os, an active LOW interrupt output, and low standby current. It includes noise filters on SCL/SDA inputs and internal power-on reset functionality. ESD protection exceeds 2000 V HBM per JESD22-A114. The component is housed in an SO24 plastic small outline package.

I/o Expanders Feature Summary

• Provides 16-bit GPIO expansion with individual I/O configuration capabilities
• Features an open-drain interrupt output activated by input state changes
• Includes polarity inversion registers for flexible logic level handling
• Supports up to eight devices sharing the same I2C bus via hardware address pins

I/o Expanders Applications

• ACPI power switches
• Sensor interface connections
• Push button scanning
• LED control circuits
• Fan speed monitoring

I/o Expanders Procurement Notes

Verify the specific ordering suffix '112' corresponds to the standard marking tube packing method as defined in the NXP datasheet. Confirm that the SO24 package variant matches the required board space constraints. Ensure compatibility with the target system's I2C bus voltage levels before finalizing procurement orders.

I/o Expanders Selection Notes

Select this component when 16-bit I/O expansion is required alongside interrupt signaling capabilities. Consider the PCA9535C variant if open-drain outputs are strictly necessary for all pins. Verify that the 2.3 V minimum supply voltage aligns with the system's power rails. Ensure the SO24 package dimensions fit the designated PCB footprint area.

I/o Expanders Part Context

This part belongs to the PCA9535 family of I2C/SMBus I/O expanders developed by NXP Semiconductors. It is functionally identical to the PCA9555 but lacks internal I/O pull-up resistors, which reduces power consumption when I/Os are held LOW. It serves as a direct replacement for legacy expanders requiring enhanced drive capability and lower supply current.

I/o Expanders Replacement Considerations

PCA9535D,118 is a reel-packaged alternative within the same series. Software modifications may be required when migrating from PCF8575 due to architectural enhancements.