TI TCA9554APWR

The TCA9554A is a 16-pin device that provides 8-bit general-purpose parallel input/output (I/O) expansion for the two-wire bidirectional I²C bus (or SMBus) protocol. The device operates with a supply voltage ranging 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 TCA9554A offers a simple solution. The TCA9554A can generate an interrupt on the INT pin when the input state changes. The hardware-selectable address pins A0, A1, and A2 allow up to eight TCA9554A 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
• Active-low interrupt output with open-drain
• Operating supply voltage range: 1.65 V to 5.5 V
• 5V-tolerant I/O ports
• 400kHz Fast-mode 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)
• ESD protection exceeding JESD 22 specification requirements
• 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