NXP semiconductors

74HC138BQ,115

Logic ICs
Signal Switches
Encoders
Multiplexers
Product description: Encoders, Decoders, Multiplexers & Demultiplexers 74HC138BQ/SOT763/DHVQFN16
INQUIRY

The 74HC138; 74HCT138 decodes three binary weighted address inputs (A0, A1 and A2) to eight mutually exclusive outputs (Y 0 to Y E3). Every output will be HIGH unless E 7). The device features three enable inputs (E 1 and E 1, E 2 and 2 are LOW and E3 is HIGH. This multiple enable function allows easy parallel expansion to a 1-of-32 (5 to 32 lines) decoder with just four '138 ICs and one inverter. The '138 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. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.

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