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发明授权
US06856173B1 Multiplexing of digital signals at multiple supply voltages in an integrated circuit 有权
在集成电路中以多个电源电压复用数字信号

Multiplexing of digital signals at multiple supply voltages in an integrated circuit
摘要：
An integrated circuit (10) includes a multiple voltage digital multiplexer circuit (30) for multiplexing digital signals provided at different supply voltage levels. In one form, the multiplexer (30) includes an analog multiplexer (32) for receiving the digital signals, a level shifter (40) coupled to the output of the analog multiplexer (32), and a supply voltage multiplexer (34) for providing one of various supply voltages used on the IC corresponding to the signals being multiplexed. A control circuit (38, 39) is used to control the input selection of the analog multiplexer (32) as well as the supply voltage multiplexer (34) for providing the correct supply voltage to the level shifter (40). This provides the ability to multiplex digital signals of differing voltage levels onto a single pad on the IC (10).
摘要（中）：

集成电路（10）包括用于复用以不同电源电压电平提供的数字信号的多电压数字多路复用器电路（30）。 在一种形式中，多路复用器（30）包括用于接收数字信号的模拟多路复用器（32），耦合到模拟多路复用器（32）的输出的电平转换器（40）和用于提供 对应于被复用的信号的IC上使用的各种电源电压之一。 控制电路（38,39）用于控制模拟多路复用器（32）的输入选择以及用于向电平转换器（40）提供正确的电源电压的电源电压多路复用器（34）。 这提供了将不同电压电平的数字信号复用到IC（10）上的单个焊盘上的能力。

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