ON Semiconductor MC14543B BCD-to-Seven Segment Latch/Decoder/Driver

The ON Semiconductor MC14543B is a highly integrated circuit designed for driving liquid crystal and LED displays. It is a BCD-to-Seven Segment Latch/Decoder/Driver, which offers a simple and efficient solution for converting binary-coded decimal (BCD) input data into signals required to drive seven-segment displays. This versatile component is widely used in applications requiring numerical display, such as calculators, digital clocks, metering devices, and other consumer electronics.

The MC14543B specifically caters to the need for a low-power device that can operate with a minimal power supply, making it ideal for battery-operated applications. It operates from a supply voltage ranging from 3 V to 18 V, providing designers with flexibility in terms of power management. Additionally, the device features an on-chip voltage reference and an on-chip clock oscillator that significantly reduce the number of external components required for operation.

The device is equipped with a BCD input structure that provides a direct connection to most microprocessor buses or outputs of BCD decoders such as the MC14553B. It includes latches that hold the BCD inputs until a new digit is available, ensuring stable display data. The MC14543B also has a phase input that controls the phase of the output waveform to drive the display.

Furthermore, the MC14543B offers an interdigit blanking function that can be used to blank off any undesired leading or trailing zeros. The blanking input (BI) and lamp test input (LT) are provided for testing and controlling the display. The lamp test functionality allows for quick and easy testing of all display segments to verify proper functionality.

The device comes in various package types, such as PDIP, SOIC, and TSSOP, making it suitable for different assembly requirements. It is also characterized for operation from -55°C to +125°C, ensuring reliability and performance across a wide range of environmental conditions. The ON Semiconductor MC14543B is a robust and versatile driver that simplifies the design and enhances the functionality of seven-segment display applications.

For detailed specifications and application notes, designers are encouraged to consult the official datasheet provided by ON Semiconductor, which offers comprehensive information to ensure optimal use of the MC14543B in their projects.