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74HC238 and 74HCT238 are high-speed Si-gate CMOS devices and are pin compatible with Low-Power Schottky TTL (LSTTL).

The 74HC238/74HCT238 decoders accept three binary weighted address inputs (A0, A1, A2) and when enabled, provide 8 mutually exclusive active HIGH outputs (Y0 to Y7). The 74HC238/74HCT238 features three enable inputs: two active LOW (E1 and E2) and one active HIGH (E3). Every output will be LOW unless E1 and E2 are LOW and E3 is HIGH. This multiple enable function allows easy parallel expansion of the "238" to a 1-to-32 (5 lines to 32 lines) decoder with just four "238" ICs and one inverter. The "238" can be used as an eight output demultiplexer by using one of the active LOW enable inputs as the data input and the remaining enable inputs as strobes. Unused enable inputs must be permanently tied to their appropriate active HIGH or LOW state.

The 74HC238/74HCT238 is similar to the 74HC138/74HCT138 but has non-inverting outputs.

自动翻译：

74HC238和74HCT238高速Si-gate CMOS器件是兼容与低功率和销钉(LSTTL肖特基TTL)。
　　
　　74HC238/74HCT238解码器接受三个二进制位的加权地址输入(A0,A1、A2)和当激活,提供8相互排斥的活性高,输出(Y0 Y7)。74HC238/74HCT238特征的输入:两个活跃三个使低(E1和E2)和一个活跃高(E3)。每个输出将会低,除非E1和E2和E3是高是低。这个多重使功能允许容易平行的前男友