CD74HCT251MT

The CD74HCT251MT is a logic device ideal for digital systems that require high speed and low noise performance. This integrated circuit is capable of performing multiplexing, decoding, and switching functions with total output currents up to 27 mA. It is among the most commonly used integrated circuits for designs using low voltage, single supply designs.

The CD74HCT251MT can be used in a variety of applications, such as switching of logic signals, multiplexing/demultiplexing of digital memories, data routing and distribution, logic translation, analog-to-digital conversion and connection of different subsystems within a larger system. The device supports two channels, with available active low or active high inputs, enabling A and B bits of a bus to be multiplexed onto a single output.

The CD74HCT251MT is one of the few devices featuring double-edge-triggered flip-flops to provide clean multiplexing performance over a wide range of input and output frequencies. The device utilizes a high speed logic circuit built-in to allow fast switching between channels, with minimum loading and no crosstalk. The device also reduces power consumption, operating on the equivalent of a single +5V power supply voltage, with the majority of power being delivered to the output pins.

The device features four data channels (A, D, B, & C) and two select channels (S0 & S1). It consists of an 8-bit multiplexer/demultiplexer connected to two 4-bit address decoders. The multiplexer/demultiplexer provides two outputs buffered by two 3-state drivers having TTL compatibility and can be controlled by the two select channels. The eight data inputs are selected based on the values at these two selection lines (S0 & S1). The output drivers are enabled or disabled by the output enable (OE) input.

When the output enable (OE) is low, the outputs are in the high impedance disabled state, regardless of the select and data input levels. The device also features a low propagation delay, which is the time required to switch between channels. The CD74HCT251MT can cover frequencies up to 70 MHz, providing an excellent performance level compared to other devices in its class.

The CD74HCT251MT is a popular choice for digital logic applications, due to its high speed, low noise and low power performance. It is uniquely suited for applications in which multiplexing/demultiplexing is required as it allows for direct connection of two buses, thus reducing the number of external components need for such designs. By using this device, designers can achieve high flexible data routing or data distribution within their designs.