Toshiba Corporation Signal Switches, Multiplexers, Decoders 74VHC138FT

The 74VHC138FT is a high-speed CMOS 3-to-8 line decoder designed for low power dissipation and high noise immunity. It operates with a supply voltage range of 2.0 to 5.5 V and features a typical propagation delay of 5.7 ns at 5 V. The device includes three binary select inputs (A, B, C) that determine which of the eight outputs (Y0 to Y7) will be activated. When the enable input G1 is low or either of the inputs 2A or 2B is high, the decoding function is disabled, and all outputs are set high. This decoder is suitable for interfacing between 5 V and 3 V systems and can be used in applications requiring address decoding for memory systems. It also includes input protection that allows for input voltages up to 5.5 V regardless of the supply voltage, preventing damage from mismatched voltage levels. The 74VHC138FT is pin and function compatible with the 74ALS138, making it a versatile choice for various digital applications.