Texas Instruments PCA9554
The PCA9554 consists of one 8-bit Configuration (input or output selection), Input, Output, and Polarity Inversion (active high or active low) registers. The data for each input or output is kept in the corresponding Input or Output register. The polarity of the Input Port register can be inverted with the Polarity Inversion register.| Part No. | PCA9554 |
|---|---|
| Datasheet | PCA9554 Download |
| Manufacturer |  Texas Instruments |
| Description | Remote 8-Bit I2C AND SMBus I/O Expander |
| Buy | Stock & Price |
FEATURES
●1 I2C to Parallel Port Expander● Open-Drain Active-Low Interrupt Output
● Operating Power-Supply Voltage Range of 2.3 V to 5.5 V
● 5-V Tolerant I/Os
● 400-kHz Fast I2C Bus
● Three Hardware Address Pins Allow up to Eight Devices on the I2C/SMBus
● Input/Output Configuration Register
● Polarity Inversion Register
● Internal Power-On Reset
● Power-Up With All Channels Configured as Inputs
● No Glitch On Power Up
● Latched Outputs With High-Current Drive Maximum Capability for Directly Driving LEDs
● Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
● ESD Protection Exceeds JESD 22 – 2000-V Human-Body Model (A114-A) – 200-V Machine Model (A115-A) – 1000-V Charged-Device Model (C101) 2
DESCRIPTION
This 8-bit I/O expander for the two-line bidirectional bus (I2C) is designed for 2.3-V to 5.5-V VCC operation. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface [serial clock (SCL), serial data (SDA)]. At power on, the I/Os are configured as inputs with a weak pullup to VCC.
