器件名称:
74HCT390
功能描述:
Dual decade ripple counter
文件大小:
49.22KB 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/HCT390 Dual decade ripple counter Product specication File under Integrated Circuits, IC06 December 1990 Philips Semiconductors Product specication Dual decade ripple counter FEATURES Two BCD decade or bi-quinary counters One package can be configured to divide-by-2, 4, 5, 10, 20, 25, 50 or 100 Two master reset inputs to clear each decade counter individually Output capability: standard ICC category: MSI GENERAL DESCRIPTION The 74HC/HCT390 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A. The 74HC/HCT390 are dual 4-bit decade ripple counters divided into four separately clocked sections. The counters have two divide-by-2 sections and two divide-by-5 sections. These sections are normally used in a BCD QUICK REFERENCE DATA GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns 74HC/HCT390 decade or bi-quinary configuration, since they share a common master reset input (nMR). If the two master reset inputs (1MR and 2MR) are used to simultaneously clear all 8 bits of the counter, a number of counting configurations are possible within one package. The separate clocks (nCP0 and nCP1 ) of each section allow ripple counter or frequency ……
