PCA9536D

I/o Expanders Overview

The PCA9536D is a remote 4-bit I2C and SMBus 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 four configurable I/O pins, which default to inputs with internal pull-up resistors upon power-on reset. It lacks an interrupt output pin. The component is housed in an 8-SOIC package and functions across a temperature range of -40°C to +85°C.

I/o Expanders Feature Summary

• Configurable 4-bit I/O ports allow flexible input or output assignment via configuration registers.
• Integrated polarity inversion register enables active-high or active-low operation for all ports.
• Internal noise filters on SCL and SDA inputs mitigate signal interference.
• Power-on reset mechanism initializes the state machine and sets default register values.

I/o Expanders Applications

• Portable consumer electronics requiring additional GPIOs
• Industrial control systems utilizing I2C communication
• Embedded devices needing low-power I/O expansion

I/o Expanders Procurement Notes

Verify the specific ordering suffix to confirm package type and tape/reel specifications. Confirm RoHS compliance status as required by project regulations. Check for obsolescence notices, as this part may have been superseded by newer revisions or alternative manufacturers. Ensure the supplier provides valid traceability documentation for quality assurance purposes.

I/o Expanders Selection Notes

Select this component when a fixed I2C address is acceptable, as the address cannot be configured externally. Choose the PCA9536D over variants with interrupt outputs if hardware complexity must be minimized. Verify that the 400 kHz speed meets system timing requirements. Consider the 8-SOIC footprint constraints during PCB layout planning.

I/o Expanders Part Context

This part belongs to the PCA9536 family of 4-bit I/O expanders. It shares functional similarities with other Texas Instruments and NXP I2C GPIO solutions but is distinguished by its fixed addressing and lack of interrupt capability. It serves as a cost-effective solution for simple I/O expansion tasks in space-constrained applications.

I/o Expanders Replacement Considerations

The PCA9536D,118 from NXP USA Inc. is listed as a direct substitute. Verify pin compatibility and electrical characteristics before substitution. Note that the original PCA9536D may be obsolete; check current availability for both options.