应用功能： 4 1/2位LCD显示计数器驱动 The ICM7224 device is a high-performance, CMOS 41/2 digit counter, including decoder, output latch, display driver,count inhibit, leading zero blanking, and reset circuitry.The counter section provides direct static counting, guaranteed from DC to 15MHz, using a 5V ±10% supply over the operating temperature range. At normal ambient temperatures,the devices will typically count up to 25MHz.
