PCA9534D,118

I/o Expanders Overview

The PCA9534D,118 is an 8-bit I/O expander manufactured by NXP USA Inc. It operates on a supply voltage range of 2.3 V to 5.5 V and supports I2C/SMBus communication with a maximum clock frequency of 400 kHz. The device features 8 configurable general-purpose I/O pins that default to inputs upon power-on reset. It includes an active LOW open-drain interrupt output, polarity inversion register, and noise filters on SCL/SDA inputs. The component is housed in an SO16 plastic small outline package (SOT162-1) and functions within an ambient temperature range of -40 °C to +85 °C.

I/o Expanders Feature Summary

• Provides 8-bit GPIO expansion via I2C-bus and SMBus interfaces
• Features an active LOW open-drain interrupt output for input state change detection
• Includes a polarity inversion register to modify Input Port register data behavior
• Offers 5 V tolerant I/Os and low standby current consumption

I/o Expanders Applications

• ACPI power switches
• Sensor interface expansion
• Push button monitoring
• LED control systems
• Fan speed or status monitoring

I/o Expanders Procurement Notes

Verify the specific ordering suffix '118' corresponds to the reel packing method when sourcing this part number. Confirm the manufacturer is NXP USA Inc. and ensure the package type matches the required SO16 footprint. Cross-reference the datasheet revision to confirm compatibility with existing system designs.

I/o Expanders Selection Notes

Select this component when an 8-bit I/O expansion solution is required for I2C-based systems. Ensure the design accommodates the 2.3 V to 5.5 V operating voltage range. Consider the interrupt functionality if real-time input state changes are necessary. Verify that the SO16 package dimensions fit the available PCB space.

I/o Expanders Part Context

The PCA9534 is part of the NXP Semiconductors family of I2C-bus I/O expanders. It serves as an enhancement over earlier models like the PCF8574 series, offering higher drive capability and lower supply current. While pin-to-pin compatible with certain legacy devices, software modifications are required due to architectural improvements such as the configuration registers and interrupt outputs.

I/o Expanders Replacement Considerations

The PCA9534D is functionally identical to the PCA9554, except the PCA9554 includes internal I/O pull-up resistors. For direct replacements without internal pull-ups, verify the PCA9534D,112 (tube packaging) or other variants within the PCA9534 family.