器件名称: 54ACT157D
功能描述: Quad 2-Input Multiplexer
文件大小: 137.13KB 共8页
简 介:54AC157 54ACT157 Quad 2-Input Multiplexer
July 1998
54AC157 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 common 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 mA ’ACT157 has TTL-compatible 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
www.national.com
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 common 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 show……
