The TCA6408PW is an 8-bit I/O Expander for the two-line bidirectional bus (I²C) is designed to provide general-purpose remote I/O expansion for most microcontroller families via the I²C interface [serial clock (SCL) and serial data (SDA)]. The major benefit of this device is its wide VCC range. It can operate from 1.65 to 5.5V on the P-port side and on the SDA/SCL side. This allows the TCA6408 to interface with next-generation microprocessors and microcontrollers on the SDA/SCL side, where supply levels are dropping down to conserve power. In contrast to the dropping power supplies of microprocessors and microcontrollers, some PCB components such as LEDs remain at a 5V power supply. It consists of one 8-bit Configuration (input or output selection), input, output and polarity inversion (active high) register. At power on, the I/Os are configured as inputs. However, the system master can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits.
● Allows bidirectional voltage-level translation and GPIO expansion
● Schmitt-trigger action allows slow input transition and better switching noise immunity
● Active-low reset (RESET)\ input
● Open-drain active-low interrupt (INT)\ output
● 400kHz Fast I²C bus
● Input/output configuration register
● Polarity inversion register
● Internal power-ON reset
● Power up with all channels configured as inputs
● No glitch on power-up
● Noise filter on SCL/SDA input
● Latched outputs with high-current drive maximum capability for directly driving LEDs
● Latch-up performance exceeds 100mA per JESD 78, class II
● 1µA Low standby current consumption
● Green product and no Sb/Br
●Device has limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
