HD74LS138

The HD74LS138 is a kind of 3-line-to-8-line decoder/demultiplexer. The HD74LS138 decodes one-of-eight line 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.

The following is about the electrical characteristics of HD74LS138(Ta=-20 to +75): (1)input voltage: VIH: 2.0 V min; VIL: 0.8 V max; (2)output voltage: VOH: 2.7 V min at VCC=4.75 V, VIH=2 V, VIL=0.8 V, IOH=-400A; VOL: 0.4 V max at VCC=4.75 V, VIH=2 V, VIL=0.8 V, IOL=4 mA and 0.5 V max at VCC=4.75 V, VIH=2 V, VIL=0.8 V, IOL=4 mA; (3)input current: IIH: 20A at VCC=5.25 V, VI=2.7 V; -0.4 mA at VCC=5.25 V, VI=0.4 V; II: 0.1 mA max at VCC=5.25 V, VI=7 V; (4)short-circuit output current, IOS: -20 mA min and -100 mA max at VCC=5.25 V; (5)supply current, ICC: 6.3 mA typ and 10 mA at VCC=5.25 V, outputs enabled and open; (6)input clamp voltage, VIK: -1.5 V at VCC=4.75 V, IIN=-18 mA.

There is not much information about HD74LS138. If you want to get more information, please pay attention to our website and we will update it in time.