TI TCA9554DBQR

The TCA9554 is a 16-pin device that provides 8-bit general-purpose parallel input and output (I/O) expansion for the two-wire bidirectional I²C bus (or SMBus) protocol. The device operates with a supply voltage range from 1.65V to 5.5V. It supports two clock frequencies: 100kHz (Standard Mode) and 400kHz (Fast Mode). When additional I/O is required for switches, sensors, buttons, LEDs, fans, and other similar devices, an I/O expander like the TCA9554 offers a simple solution. The features of the TCA9554 include generating an interrupt on the INT pin when the state of an input port changes. The hardware-selectable address pins A0, A1, and A2 allow up to eight TCA9554 devices to be on the same I²C bus. The device can also be powered through a power cycle to generate a power-on reset, resetting it to the default state.

• I2C-to-parallel port expander with open-drain, active-low interrupt output
• 1.65V to 5.5V operating supply voltage range with 5V-tolerant I/O ports
• 400kHz Fast I²C bus
• 3 hardware address pins supporting up to 8 devices on I2C/SMBus
• Input and output configuration registers
• Polarity inversion register
• Internal power-on reset
• Low standby current consumption
• All channels configured as inputs at power-on
• No glitch pulses at power-on
• Noise filter on SCL/SDA inputs
• Latched outputs with maximum high-current drive capability for direct LED driving
• Latch-up performance exceeding 100mA, compliant with JESD 78 Class II specifications
• ESD protection exceeding JESD 22 specifications
• 2000V Human Body Model (A114-A)
• 1000V Charged Device Model (C101)

• Servers
• Routers (telecom switching equipment)
• Personal computers
• Personal electronics (e.g., gaming consoles)
• Industrial automation
• Products using GPIO-constrained processors