Overview
The PCA9554ADB, produced by Texas Instruments, is an 8-bit I2C/SMBus I/O expander designed for remote I/O expansion in various microcontroller-based systems. This component operates within a power-supply voltage range of 2.3 V to 5.5 V, making it versatile for different application environments. It features an open-drain active-low interrupt output, allowing it to notify the microcontroller of changes in input states without continuous polling. The PCA9554ADB is packaged in a 16-pin SSOP (DB) package and is RoHS compliant.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 16-SSOP (DB) |
| Pins | 16 |
| Operating Temperature Range | -40°C to 85°C |
| Supply Voltage Range | 2.3 V to 5.5 V |
| I2C Bus Frequency | 400 kHz |
| Number of I/Os | 8 |
| I/O Configuration | Input/Output Configuration Register |
| Interrupt Output | Open-Drain Active-Low |
| ESD Protection | 2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model |
| Output Source/Sink Current | Up to 25 mA |
Key Features
- I2C to Parallel Port Expander
- 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 and Polarity Inversion Register
- Internal Power-On Reset and No Glitch On Power Up
- Latched Outputs With High-Current Drive Capability for Directly Driving LEDs
- ESD Protection Exceeds JESD 22 Standards
Applications
The PCA9554ADB is suitable for a wide range of applications requiring remote I/O expansion, including:
- Microcontroller-based systems needing additional I/O ports
- Industrial control systems
- Consumer electronics
- Automotive systems
- Medical devices
Q & A
- What is the operating voltage range of the PCA9554ADB?
The PCA9554ADB operates within a power-supply voltage range of 2.3 V to 5.5 V. - How many I/Os does the PCA9554ADB provide?
The PCA9554ADB provides 8 I/Os. - What is the maximum frequency of the I2C bus for the PCA9554ADB?
The maximum frequency of the I2C bus is 400 kHz. - Can the PCA9554ADB drive LEDs directly?
Yes, the PCA9554ADB has latched outputs with high-current drive capability for directly driving LEDs. - How many devices of the PCA9554ADB can be connected on the same I2C/SMBus?
Up to eight devices of the PCA9554ADB (and eight of the PCA9554A) can be connected on the same I2C/SMBus. - What type of interrupt output does the PCA9554ADB have?
The PCA9554ADB has an open-drain active-low interrupt output. - Is the PCA9554ADB RoHS compliant?
Yes, the PCA9554ADB is RoHS compliant. - What is the package type of the PCA9554ADB?
The PCA9554ADB is packaged in a 16-pin SSOP (DB) package. - How does the PCA9554ADB handle power-on reset?
The PCA9554ADB has an internal power-on reset feature that configures all channels as inputs and initializes the I2C/SMBus state machine. - What is the ESD protection level of the PCA9554ADB?
The PCA9554ADB has ESD protection exceeding 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
