NXP PCA9536 PCA9536D,118— 4-Bit I²C-Bus GPIO Expander

Description
The NXP PCA9536 is an 8-pin CMOS device that provides 4 bits of General Purpose parallel Input/Output (GPIO) expansion for I²C-bus and SMBus systems. Designed to meet the needs of applications requiring more I/Os like ACPI power switches, sensors, LEDs, and push buttons, the PCA9536 integrates a 4-bit Configuration register for input/output direction control, an Input Port register, an Output Port register, and a Polarity Inversion register to flexibly adapt signal logic. All I/Os are 5V tolerant and default to inputs with 100 kΩ internal pull-up resistors. Key features include a wide operating voltage range (2.3V to 5.5V), integrated noise filters on SCL/SDA lines, internal power-on reset, and glitch-free power-up behavior. Supporting I²C bus speeds up to 400 kHz and providing robust ESD protection, the PCA9536 is ideal for cost-effective and space-constrained designs. The device is available in SO8, TSSOP8 (MSOP8), and HVSON8 packages.

Key Features

• 4-bit GPIO expansion via I²C-bus/SMBus

• Operating voltage range: 2.3 V to 5.5 V

• 5V tolerant input/output pins

• Internal noise filters on SCL/SDA inputs

• Low standby current for energy-efficient designs

• Power-on reset with glitch-free startup

• Polarity Inversion register for flexible signal handling

• Supports clock frequencies up to 400 kHz

• Robust ESD protection:

  • 2000 V HBM

  • 200 V MM

  • 1000 V CDM

• JEDEC-standard latch-up immunity (>100 mA)

• Available in compact SO8, TSSOP8 (MSOP8), and HVSON8 packages

Applications

• Power management and ACPI switches

• Sensor interface expansion

• Push button and keypad interfacing

• LED status control

• Small fan control

• General-purpose I/O expansion in embedded systems

  For more models and detailed support, please contact us. Only a few key models have been uploaded—if you need other part numbers or special configurations, feel free to reach out!