74LVC138A

The 74LVC138A is a low-voltage, low-power, high-performance Si-gate CMOS device, superior to most advanced CMOS compatible TTL families.

The 74LVC138A accepts three binary weighted address inputs (A0,A1, A2) and when enabled, provides 8 mutually exclusive active LOW outputs (Y₀ toY₇).

The 74LVC138A features three enable inputs: two active LOW (E₁ and E₂) and one active HIGH (E₃). Every output will be HIGH unless
E₁ and E₂ are LOW and E₃ is HIGH.

This multiple enable function of the 74LVC138A allows easy parallel expansion of the 74LV138A to a 1-of-32 (5 lines to 32 lines) decoder with just four 74LV138A ICs and one inverter. The 74LV138A can be used as an eight output demultiplexer by using one of the active LOW enable inputs as the data input and the remaining enable inputs as strobes. Unused enable inputs must be permanently tied to their appropriate active HIGH or LOW state.