EEPW首页| 器件索引| 厂商列表| IC替换| 微缩略语| 电路图查询
器件查询:
400万器件资料库等您来搜!
首页>FAIRCHILD> DM74S163

DM74S163

器件名称: DM74S163
功能描述: Synchronous 4-Bit Binary Counters
文件大小: 80.54KB 共7页
生产厂商: FAIRCHILD
下  载: 在线浏览点击下载
简  介: DM74S161 DM74S163 Synchronous 4-Bit Binary Counters August 1986 Revised April 2000 DM74S161 DM74S163 Synchronous 4-Bit Binary Counters General Description These synchronous, presettable counters feature an internal carry look-ahead for application in high-speed counting designs. They are 4-bit binary counters. The carry output is decoded by means of a NOR gate, thus preventing spikes during the normal counting mode of operation. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when so instructed by the count enable inputs and internal gating. This mode of operation eliminates the output counting spikes which are normally associated with asynchronous (ripple clock) counters. A buffered clock input triggers the four flip-flops on the rising (positivegoing) edge of the clock input waveform. These counters are fully programmable; that is, the outputs may be preset to either level. As presetting is synchronous, setting up a LOW level at the load input disables the counter and causes the outputs to agree with the setup data after the next clock pulse regardless of the levels of the enable input. The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without additional gating. Instrumental in accomplishing this function are two count-enable inputs and a ripple carry output. Both count-enable inputs (P and T) must be HIGH to count, and input T is fed f……
相关电子器件
器件名 功能描述 生产厂商
DM74S163N SYNCHRONOUS 4-BIT BINARY COUNTERS NSC
DM74S163N Synchronous 4-Bit Binary Counters FAIRCHILD
DM74S163 SYNCHRONOUS 4-BIT BINARY COUNTERS NSC
DM74S163 Synchronous 4-Bit Binary Counters FAIRCHILD
《电子产品世界》杂志社 版权所有 北京东晓国际技术信息咨询有限公司
Copyright ©2002 ELECTRONIC ENGINEERING & PRODUCT WORLD. All rights reserved.
京ICP备12027778号-2