3 TO 8 LINE DECODER/DEMULTIPLEXER

DESCRIPTION

The U74HC238 decodes three binary weighted address inputs

(A0, A1 and A2) to eight mutually exclusive outputs (Y0 to Y7). The

device features three enable inputs ( E1 and E2 and E3). Every

output will be LOW unless E1 and E2 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 U74HC238 ICs and one

inverter. The U74HC238 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.

FEATURES

* Demultiplexing capability

* Multiple input enable for easy expansion

* Ideal for memory chip select decoding

* Active HIGH mutually exclusive outputs