STMicroelectronics 74ACT257M Quadruple 2-Input Multiplexer with 3-State Outputs

The 74ACT257M is a high-speed CMOS QUAD 2-INPUT MULTIPLEXER fabricated with silicon gate CMOS technology from STMicroelectronics. It achieves the high-speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation. This multiplexer is designed for 2V to 6V VCC operation.

The device features four multiplexers with three-state outputs that can interface directly with the data lines of a bus system. Each multiplexer has two data inputs (A and B), one select input, and one output. The select input determines which of the data inputs is connected to the output. When the select input is low, the A input is connected to the output, and when high, the B input is connected to the output.

Furthermore, the 74ACT257M provides true data at the output. A high-level voltage applied to the Output Enable (OE) input can disable the device so that the buses are effectively isolated. This feature allows for the easy implementation of parallel data buses in systems.

Key features of the 74ACT257M include:

• High-speed: tPD = 4.8ns (typ.) at VCC = 5V
• Power down protection is provided on all inputs and outputs
• Low power dissipation: ICC = 4µA (max.) at TA = 25°C
• Low noise: VOLP = 0.8V (max.)
• Pin and function compatible with 74 series 257

This device is commonly used in situations requiring the selection or routing of data from two sources to one destination. Its high-speed performance makes it suitable for implementing high-performance memory decoders, data transmission systems, and data multiplexing applications.

STMicroelectronics provides this multiplexer in a 16-pin SOIC package, ensuring a compact footprint suitable for space-constrained applications. With its robust design and versatile functionality, the 74ACT257M is an excellent choice for designers looking to enhance their digital systems with efficient data handling capabilities.

For detailed information regarding operation conditions, electrical characteristics, and pin configurations, please refer to the official datasheet provided by STMicroelectronics.