MC14503B

The MC14503B is a CMOS dual 4-bit binary-coded decimal (BCD) counter manufactured by onsemi. It features two independent counters that operate in parallel, each capable of counting from 0 to 9 in BCD format, making it ideal for applications requiring decade counting or digital display driving. The device is designed for low power consumption and operates reliably over a wide supply voltage range of 3 to 15 V, ensuring compatibility with various system designs. Each counter includes a clock input, a reset input, and a carry output, enabling cascading for higher count ranges when multiple devices are used. The internal logic supports synchronous operation, where all state changes occur on the rising edge of the clock signal, improving timing accuracy and reducing glitches. Additionally, the counter has a buffered output stage, providing sufficient drive capability for direct connection to LED displays or other logic circuits without additional buffering. The MC14503B incorporates built-in latch functionality, allowing data to be held at the outputs while the counter continues to increment. This feature is particularly useful in multiplexed display systems where stable output is required during scanning cycles. The device also includes a disable input that can halt counting when active, offering flexibility in control logic design. This IC is commonly used in digital clocks, frequency dividers, and instrumentation panels where precise counting and display functions are essential. Its dual counter architecture simplifies circuit design by integrating two complete counting units in a single package, reducing component count and board space requirements. The low quiescent current and CMOS technology ensure minimal power dissipation, making it suitable for battery-powered or energy-sensitive applications. The MC14503B is housed in a standard 16-pin DIP package, facilitating easy integration into existing PCB layouts. It meets industrial standards for reliability and offers robust performance under varying environmental conditions, including temperature extremes and electrical noise. With its combination of functionality, efficiency, and ease of use, the MC14503B serves as a reliable building block for a wide range of digital counting and display applications.