54AC157 Datasheet | National Semiconductor

.. - 54ACT157 Quad 2-Input Multiplexer July 1998 - 54ACT157 Quad 2-Input Multiplexer General Description The ’AC/’ACT157 is a high-speed quad 2-input multiplexer. Four bits of data from two sources can be selected using the mon Select and Enable inputs. The four outputs present the selected data in the true (noninverted) form. The ’AC/ ’ACT157 can also be used as a function generator. Features n n n n ICC and IOZ reduced by 50% Outputs source/sink 24 m A ’ACT157 has TTL-patible inputs Standard Microcircuit Drawing (SMD) - ’AC157: 5962-89539 - ’ACT157: 5962-89688 Logic Symbols IEEE/IEC DS100272-1 DS100272-2 Pin Names I0a- I0d I1a- I1d E S Za- Zd Description Source 0 Data Inputs Source 1 Data Inputs Enable Input Select Input Outputs Connection Diagrams Pin Assignment for DIP and Flatpak Pin Assignment for LCC DS100272-3 DS100272-4 FACT™ is a trademark of Fairchild Semiconductor Corporation. © 1998 National Semiconductor Corporation DS100272 .national. Functional Description The ’AC/’ACT157 is a quad 2-input multiplexer. It selects four bits of data from two sources under the control of a mon Select input (S). The Enable input (E) is active-LOW. When E is HIGH, all of the outputs (Z) are forced LOW regardless of all other inputs. The ’AC/’ACT157 is the logic implementation of a 4-pole, 2-position switch where the position of the switch is determined by the logic levels supplied to the Select input. The logic equations for the outputs are shown below: Za = E - (I1a - S + I0a - S) Zb = E - (I1b - S +...