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TS3USB221: 该器件对3.3或5V的UART的TTL电平支持性?对于RS232的支持性如何?

Part Number: TS3USB221

请问该器件是否支持3.3或5V的UART的TTL电平?对于RS232的支持性如何?如果不行,有没有对应的开关芯片推荐?我需要设计成二选一