TCA6408A

低压 8 位 I2C 和 SMBus I/O 扩展器

The is a 16-pin device that provides 8-bits of general purpose parallel input/output I/O expansion for the two-line bidirectional I2C bus or SMBus protocol. This device can operate with a power supply voltage ranging from 1.65 V to 5.5 V on both the I2C bus side VCCI and on the P-port side VCCP. This allows the TCA6408A 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 5-V power supply.

The device supports both 100-kHz Standard-mode and 400-kHz Fast-mode clock frequencies. I/O expanders such as the TCA6408A provide a simple solution when additional I/Os are needed for switches, sensors, push-buttons, LEDs, fans, and so forth.

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I2C to Parallel Port Expander

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Operating Power-Supply Voltage Range of 1.65 V to 5.5 V

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Allows Bidirectional Voltage-Level Translation and GPIO Expansion Between 1.8-V, 2.5-V, 3.3-V, and 5-V I2C Bus and P-Ports

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Low Standby Current Consumption of 1 μA

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5-V Tolerant I/O Ports

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400-kHz Fast I2C Bus

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Hardware Address Pin Allows Two TCA6408A Devices on the Same I2C/SMBus Bus

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Active-Low Reset RESET Input

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Open-Drain Active-Low Interrupt INT Output

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Input/Output Configuration Register

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Polarity Inversion Register

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Internal Power-On Reset

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Power Up With All Channels Configured as Inputs

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No Glitch On Power Up

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Noise Filter on SCL/SDA Inputs

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Latched Outputs With High-Current Drive Maximum Capability for Directly Driving LEDs

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Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II

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Schmitt-Trigger Action Allows Slow Input Transition and Better Switching Noise Immunity at the SCL and SDA Inputs

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ESD Protection Exceeds JESD 22

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2000-V Human Body Model A114-A

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1000-V Charged-Device Model C101

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