74F190SC中文资料仙童半导体数据手册PDF规格书

General Description

The 74F190 is a reversible BCD (8421) decade counter featuring synchronous counting and asynchronous preset ting. The preset feature allows the 74F190 to be used in programmable dividers. The Count Enable input, the Terminal Count output and the Ripple Clock output make possible a variety of methods of implementing multistage counters. In the counting modes, state changes are initiated by the rising edge of the clock.

特性 Features

■ High-speed—125 MHz typical count frequency

■ Synchronous counting

■ Asynchronous parallel load

■ Cascadable