编码器、解码器、复用器和解复用器 3-line to 8-line Decoder/Demltplxr
The ´F138 is designed to be used in high-performance memory-decoding or data-routing applications requiring very short propagation delay times. In high-performance memory systems, these decoders can be used to minimize the effects of system decoding. When employed with high-speed memories utilizing a fast enable circuit, the delay times of this decoder and the enable time of the memory are usually less than the typical access time of the memory. This means that the effective system delay introduced by the decoder is negligible.
The conditions at the binary-select inputs and the three enable inputs select one of eight output lines. Two active-low and one active-high enable inputs reduce the need 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.
The SN54F138 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74F138 is characterized for operation from 0°C to 70°C.
型号/品牌 | 代替类型 | 替代型号对比 |
---|---|---|
SN74F138NSR TI 德州仪器 | 当前型号 | 当前型号 |
CD4511BNSR 德州仪器 | 类似代替 | SN74F138NSR和CD4511BNSR的区别 |
CD74HC238PWR 德州仪器 | 功能相似 | SN74F138NSR和CD74HC238PWR的区别 |
SN74LVC138ADR 德州仪器 | 功能相似 | SN74F138NSR和SN74LVC138ADR的区别 |