AiP74HCT390数据手册I-CORE中文资料规格书

描述 Description

The AiP74HC/HCT390 is a dual 4-bit decade ripple counter divided into four separately clocked sections. The counters have two divide-by-2 sections and two divide-by-5 sections. These sections share an asynchronous master reset input (nMR) and can be used in a BCD decade or bi-quinary configuration. If master reset inputs 1MR and 2MR are used to clear all 8 bits of the counter simultaneously, numerous counting configurations are possible within one package. Section clocksand , allow ripple counter or frequency division applications of divide-by-2, 4, 5, 10, 20, 25, 50 or 100.The HIGH-to-LOW transition of the clock inputsand trigger each section. For BCD decade operation, the nQ0 output is connected to the input of the divide-by-5 section. For bi-quinary decade operation, the nQ3 output is connected to the input and nQ0 becomes the decade output. A HIGH on the nMR input overrides the clocks and sets the four outputs LOW. Inputs include clamp diodes. It enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.

特性 Features

•Input levels:
• For AiP74HC390: CMOS level
• For AiP74HCT390: TTL level
•Two BCD decade or bi-quinary counters
•One device 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
•Specified from -40℃ to +125℃
•Packaging information: DIP16/SOP16/TSSOP16

应用 Application

• 家用电器
• 工业控制
• 新能源