器件名称:
54ACT169D
功能描述:
4-Stage Synchronous Bidirectional Counter
文件大小:
183.96KB 共10页
简 介:
54AC169 54ACT169 4-Stage Synchronous Bidirectional Counter July 1998 54AC169 54ACT169 4-Stage Synchronous Bidirectional Counter General Description The ’AC/’ACT169 is fully synchronous 4-stage up/down counter. The ’AC/’ACT169 is a modulo-16 binary counter. It features a preset capability for programmable operation, carry lookahead for easy cascading and a U/D input to control the direction of counting. All state changes, whether in counting or parallel loading, are initiated by the LOW-to-HIGH transition of the Clock. n n n n n n Synchronous counting and loading Built-In lookahead carry capability Presettable for programmable operation Outputs source/sink 24 mA ’ACT has TTL-compatible inputs Standard Microcircuit Drawing (SMD) 5962-91603 Features n ICC reduced by 50% Logic Symbols Pin Names CEP CET CP P0–P3 PE U/D DS100276-1 Description Count Enable Parallel Input Count Enable Trickle Input Clock Pulse Input Parallel Data Inputs Parallel Enable Input Up-Down Count Control Input Flip-Flop Outputs Terminal Count Output Q0–Q3 TC IEEE/IEC DS100276-2 FACT is a trademark of Fairchild Semiconductor Corporation. 1998 National Semiconductor Corporation DS100276 www.national.com Connection Diagrams Pin Assignment for DIP and Flatpak Pin Assignment for LCC DS100276-3 DS100276-4 Logic Diagram DS100276-5 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. Functional Descripti……
