
Texas Instruments
PCA9557PW
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PCA9557PW Description
PCA9557PW Description
The PCA9557PW from Texas Instruments is an 8-bit I²C/SMBus I/O expander designed to provide flexible GPIO expansion for microcontrollers in low-voltage systems. Operating within a 2.3V to 5.5V supply range, it supports a 400 kHz I²C/SMBus interface, enabling high-speed communication with host controllers. This 16-pin TSSOP device is ideal for space-constrained applications, offering 8 configurable I/O pins with 10mA source/25mA sink current capability. Though now obsolete, it remains relevant for legacy designs requiring reliable I/O expansion with Power-On Reset (POR) protection.
PCA9557PW Features
- I²C/SMBus Interface: Supports 400 kHz clock frequency for efficient data transfer.
- Wide Voltage Range: Operates from 2.3V to 5.5V, compatible with mixed-voltage systems.
- High Drive Strength: 10mA source/25mA sink current per I/O for robust peripheral control.
- Power-On Reset (POR): Ensures default state at startup, enhancing system reliability.
- Compact Package: 16-TSSOP for space-efficient PCB layouts.
- ROHS3 Compliant: Meets environmental standards for lead-free manufacturing.
PCA9557PW Applications
- Industrial Control Systems: Expands I/O for sensors, actuators, and HMI interfaces.
- Consumer Electronics: GPIO extension for smart home devices, displays, and keypads.
- Embedded Systems: Ideal for microcontroller-based designs needing additional I/Os.
- Legacy Upgrades: Suitable for maintaining or refurbishing older equipment requiring I²C/SMBus expansion.
Conclusion of PCA9557PW
The PCA9557PW is a versatile I/O expander offering high-speed communication, wide voltage compatibility, and robust drive capabilities. While obsolete, its compact form factor and reliable performance make it a practical choice for legacy or cost-sensitive designs requiring I²C/SMBus expansion. Engineers should evaluate alternative modern equivalents for new designs but can leverage this IC for proven solutions in industrial, consumer, and embedded applications.
FAQ
| Quantity | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $1.64560 | $1.65 |
| 10+ | $1.21352 | $12.14 |
| 90+ | $0.99254 | $89.33 |
| 180+ | $0.94669 | $170.40 |
| 270+ | $0.92367 | $249.39 |



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