VHCT138A 是一种先进的高速 CMOS 3-8 解码器，采用硅门极 CMOS 工艺制造。它实现了与同等双极肖特基 TTL 相似的高运行速度，同时保持了 CMOS 低功耗。启用该器件时，3 个二进制选择输入（A0、A1 和 A2）决定了哪个输出 (O#0-O#7) 将转至低电平。启用输入 E3 保持在低电平，或者 E#1 或 E#2 保持在高电平时，解码功能将被禁止，所有输出均转至高电平。E3、E#1 和 E#2 输入用于简化级联联接，并用作内存系统的地址解码器。保护电路可确保对输入引脚应用 0V 到 7V 电压而无需考虑 VCC = 0V 时的电源电压和输出引脚。这些电路可防止器件由于不匹配的供电和输入/输出电压而损坏。此器件可用作 3V 系统与 5V 系统以及两种电源系统的接口，如备用电池。
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