TCA9555PWR/BKN Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The TCA9555PWR/BKN is a 16-bit I2C/SMBus I/O expander operating from 1.65 V to 5.5 V with interrupt output, weak pull-up resistors, and configuration registers, packaged in a 24-pin TSSOP for embedded system GPIO expansion.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 24
- Lifecycle
- ACTIVE
- Datasheet
- TCA9555PWR/BKN Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.7290(MOQ 1)
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of TCA9555PWR/BKN?
- 16 GPIO pins expandable via I2C/SMBus at up to 400 kHz
- 1.65 V to 5.5 V wide supply range for mixed-voltage systems
- Interrupt output for event-driven MCU response
- Built-in weak pull-up resistors on all I/O pins
- Individual pin direction configuration via control registers
- 24-pin TSSOP package for compact PCB integration
What is TCA9555PWR/BKN used for?
The TCA9555PWR/BKN is used to expand GPIO capacity in microcontroller-based systems where 16 additional I/O pins are needed for LED control, switch scanning, or peripheral management over a 2-wire I2C bus. It serves industrial control panels, smart home gateways, and server management boards that require flexible I/O expansion with minimal wiring. Its interrupt-driven interface reduces CPU polling overhead in systems monitoring multiple discrete input signals.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the TCA9555PWR/BKN datasheet?
TCA9555PWR/BKN Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for TCA9555PWR/BKN?
Compatible alternatives and drop-in replacements for TCA9555PWR/BKN:
Frequently Asked Questions
How many I/O pins does the TCA9555PWR/BKN provide and how are they accessed?
The TCA9555PWR/BKN provides 16 bidirectional I/O pins organized as two 8-bit ports, both accessible over the I2C/SMBus interface at speeds up to 400 kHz. Each pin direction is individually programmable via configuration registers, giving designers full flexibility to mix inputs and outputs on the same device.
Over what supply voltage range does the TCA9555PWR/BKN operate reliably?
The TCA9555PWR/BKN operates across a 1.65 V to 5.5 V supply range, making it compatible with modern 1.8 V and 3.3 V microcontrollers as well as legacy 5 V systems. This wide range removes the need for level-shifting in mixed-voltage boards, simplifying schematic design considerably.
How does the interrupt pin of the TCA9555PWR/BKN improve system responsiveness?
The TCA9555PWR/BKN features an active-low interrupt output that asserts whenever any input-configured pin changes state. This allows an MCU to sleep between events instead of continuously polling the I2C bus, reducing power consumption and freeing CPU cycles in battery-powered or event-driven embedded control applications.
Is the TCA9555PWR/BKN suitable for cascading multiple expanders on the same I2C bus?
Yes, the TCA9555PWR/BKN supports up to 8 device addresses via three hardware address pins, allowing up to 8 devices on a single I2C bus, providing up to 128 additional GPIO pins. This makes it ideal for large LED matrix panels, industrial button arrays, and server baseboard management controllers requiring many independently addressable I/O banks.
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Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
More from Texas Instruments
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $1.2150 | $1.22 |
| 5+ | $1.0125 | $5.06 |
| 16+ | $0.7290 | $11.66 |
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