双电源电平转换器的上电顺序介绍。

Start the control circuit first, followed by the other circuitry. Then, apply the control signals to place internal logic in a steady state and then apply other signals. The order is similar for bidirectional dual-power level shifters (buffer type) and unidirectional dual-power level shifters (buffer type).

下面以双向双电源电平转换总线缓冲器为例。单向双电源电平转换总线缓冲器的上电顺序必须与双向双电源电平转换总线缓冲器的上电顺序相同。
首先启动控制电路,再启动其它电路。随后,施加控制信号使内部逻辑处于稳定状态,再施加其它信号。

按以下顺序施加电源信号和其它信号:

#1.VCCA
#2.VCCB(VCCA与VCCB可同时上电)
#3.控制信号(/OE、DIR)
#4.输入信号(A1或B1)

双电源电平转换总线缓冲器
双电源电平转换总线缓冲器
双电源电平转换总线开关
双电源电平转换总线开关

电平转换总线开关按相同顺序操作。

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