The LS138 decode one of eight lines dependent on the conditions at the three binary select inputs and the three enable inputs. 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. This decoder/demultiplexer features fully buffered inputs, each of which represents only one normalized load to its driving circuit. All inputs are clamped with high-performance Schottky diodes to suppress line-ringing and to simplify system design. Technical data: Bandwidth 35 MHz High Level Output Current -400 µA Independent Circuits 1 Input Current 100 µA Logic Function Decoder, Demultiplexer Low Level Output Current 8 mA Max Operating Temperature 70 °C Max Power Dissipation 1 mW Max Supply Voltage 5.25 V Min Operating Temperature 0 °C Min Supply Voltage 4.75 V Number of Bits 8 Number of Channels 1 Number of Circuits 1 Number of Elements 1 Number of Input Lines 3 Number of Inputs 3 Number of Output Lines 8 Number of Outputs 8 Operating Supply Voltage 5 V Polarity Inverting Propagation Delay 41 ns Quiescent Current 6.3 mA Supply Type Single Turn-On Delay Time 41 ns https://elecena.pl/product/23210344/sn74ls138n-74ls138-single-supply-decoder-demultiplexer-ttl-dip16 2023-04-13 https://elecena.pl/product/23210344/sn74ls138n-74ls138-single-supply-decoder-demultiplexer-ttl-dip16 2025-10-29