器件名称: 74HCT4520
功能描述: Dual 4-bit synchronous binary counter
文件大小: 55.15KB 共7页
简 介:INTEGRATED CIRCUITS
DATA SHEET
For a complete data sheet, please also download:
The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications The IC06 74HC/HCT/HCU/HCMOS Logic Package Information The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines
74HC/HCT4520 Dual 4-bit synchronous binary counter
Product specication File under Integrated Circuits, IC06 December 1990
Philips Semiconductors
Product specication
Dual 4-bit synchronous binary counter
FEATURES Output capability: standard ICC category: MSI GENERAL DESCRIPTION The 74HC/HCT4520 are high-speed Si-gate CMOS devices and are pin compatible with the “4520” of the “4000B” series. They are specified in compliance with JEDEC standard no. 7A. The 74HC/HCT4520 are dual 4-bit internally synchronous binary counters with an active HIGH clock input (nCP0) and an active LOW clock input (nCP1), buffered outputs
74HC/HCT4520
from all four bit positions (nQ0 to nQ3) and an active HIGH overriding asynchronous master reset input (nMR). The counter advances on either the LOW-to-HIGH transition of nCP0 if nCP1 is HIGH or the HIGH-to-LOW transition of nCP1 if nCP0 is LOW. Either nCP0 or nCP1 may be used as the clock input to the counter and the other clock input may be used as a clock enable input. A HIGH on nMR resets the counter (nQ0 to nQ3 = LOW) independent of nCP0 and nCP1. APPLICATIONS Multistage synchronous counting Multistage asynchronous counting Frequency dividers
QUICK REFERENCE DATA GND = 0 V; Tamb = 25 °C; tr = tf = ……
