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PCA9554ABS from NXP,NXP Semiconductors

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PCA9554ABS

Manufacturer: NXP, PHILIPS

8-bit I虏C-bus and SMBus I/O port with interrupt

Partnumber Manufacturer Quantity Availability
PCA9554ABS NXP, PHILIPS 5289 In Stock

Description and Introduction

8-bit I虏C-bus and SMBus I/O port with interrupt The PCA9554ABS from NXP Semiconductors is an 8-bit I²C-bus and SMBus I/O expander designed to enhance system flexibility by providing additional GPIO (General-Purpose Input/Output) ports. This CMOS-based component is ideal for applications requiring efficient control of multiple peripherals while minimizing microcontroller pin usage.  

Featuring an I²C interface, the PCA9554ABS supports standard (100 kHz) and fast (400 kHz) communication modes, ensuring compatibility with a wide range of host controllers. Each of its eight I/O pins can be independently configured as inputs or outputs, with internal pull-up resistors simplifying circuit design. The device also includes interrupt functionality, alerting the host controller of input state changes to reduce polling overhead.  

Operating within a voltage range of 2.3V to 5.5V, the PCA9554ABS is suitable for both low-power and standard applications. Its robust ESD protection ensures reliability in industrial and consumer electronics. Common use cases include LED dimming, sensor interfacing, and keypad scanning.  

Housed in a compact SO16 package, the PCA9554ABS offers a space-efficient solution for expanding I/O capabilities in embedded systems. With its low standby current consumption and straightforward integration, it is a versatile choice for designers seeking scalable control options.

Application Scenarios & Design Considerations

8-bit I虏C-bus and SMBus I/O port with interrupt

Alternative Part Number

  • TCA9554APWR --: Pin-compatible 8-bit I2C/SMBus I/O expander with the same register set and address scheme, available in TSSOP and widely stocked as a direct functional replacement.
  • PCF8574AT --: Same manufacturer's classic 8-bit I2C I/O expander in SO package; functionally similar for simple port expansion though it lacks the PCA9554 configuration register, so minor firmware changes may be needed.
  • MAX7311AUG+ --: 16-bit I2C I/O expander with interrupt output and configurable registers; offers more I/O than the PCA9554 and can replace it where extra ports are acceptable and pinout is adapted.
  • TCA9554APW --: Pin-compatible 8-bit I2C I/O expander with the same register map and address scheme, widely available and a direct functional drop-in for the PCA9554.
  • PCF8574AT --: Classic 8-bit I2C I/O expander from the original Philips/NXP lineage with similar functionality; requires minor software adjustment for register differences but is a proven, low-cost substitute.
  • MAX7311AUG --: 16-bit I2C I/O expander that can cover the PCA9554 function with additional ports; useful when extra I/O is acceptable and offers robust interrupt handling.

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