ON Semiconductor DM74LS156N Dual 2-Line to 4-Line Decoders/Demultiplexers

The ON Semiconductor DM74LS156N is a high-performance integrated circuit designed to address the needs of complex digital systems. This versatile component functions as either a dual 2-line to 4-line decoder or a dual 1-to-4 line demultiplexer, making it an essential building block in a wide range of applications, from simple data routing to more complex address decoding in computer systems.

Constructed with Low Power Schottky (LPS) technology, the DM74LS156N ensures reduced power consumption without compromising on speed. This makes it suitable for use in energy-sensitive designs where both efficiency and high-speed operation are required. The device features two individual decoders, each accepting two binary weighted inputs (A0, A1) and providing four mutually exclusive active LOW outputs (O0 to O3).

Each decoder has its own active LOW Enable input (E), which, when HIGH, forces all outputs of the decoder to be HIGH regardless of the state of the other inputs. This enable function allows for the expansion of decoding lines through the cascading of multiple chips. When used as a demultiplexer, the E input serves as the data input while A0 and A1 are the control inputs which determine the distribution of the data to the four outputs.

The DM74LS156N is housed in a 16-pin DIP (Dual In-line Package), which is widely used and easily integrated into standard breadboards and prototyping boards. Its pin configuration is designed to simplify PCB layout and minimize the need for additional wiring, thus reducing the risk of errors during assembly.

Key features of the DM74LS156N include:

• Typical power dissipation of 150mW
• Supply voltage range of 4.75V to 5.25V
• High noise immunity characteristic of LPS TTL devices
• Output current capability of 8mA for driving inputs in TTL logic circuits
• Low input current of 1µA, contributing to its energy-efficient design

ON Semiconductor's commitment to quality ensures that the DM74LS156N meets stringent industry standards for performance and reliability, making it a trusted choice for designers and engineers seeking to create robust digital systems.