ZHCSP53G December 1982 – October 2021 SN54HC138 , SN74HC138
PRODUCTION DATA
請參考 PDF 數據表獲取器件具體的封裝圖。
The SNx4HC138 devices are 3-to-8 decoders and demultiplexers. The three input pins, A, B, and C, select which output is active. The selected output is pulled LOW, while the remaining outputs are all HIGH. The conditions at the binary-select inputs at the three enable inputs select one of eight output lines. Two active-low and one active-high enable inputs reduce the requirement for external gates or inverters when expanding. A 24-line decoder can be implemented without external inverters, and a 32-line decoder requires only one inverter. An enable input can be used as a data input for demultiplexing applications.