CD74HC251MT

Product Overview

• Category: Integrated Circuit
• Use: Digital Multiplexer/Demultiplexer
• Characteristics: High-Speed, CMOS Logic, 8-Channel
• Package: TSSOP (Thin Shrink Small Outline Package)
• Essence: CD74HC251MT is a digital multiplexer/demultiplexer integrated circuit that allows the selection of one out of eight data inputs and routes it to a single output line.
• Packaging/Quantity: The CD74HC251MT is typically sold in reels containing 2500 units.

Specifications

• Supply Voltage: 2V to 6V
• Logic Family: HC (High-Speed CMOS)
• Number of Channels: 8
• Input Compatibility: TTL, CMOS
• Propagation Delay: 13 ns (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The CD74HC251MT has a total of 16 pins. The pin configuration is as follows:

+---+--+---+ A1 -|1 +--+ 16|- VCC A2 -|2 15|- Y A3 -|3 14|- GND A4 -|4 13|- S0 A5 -|5 CD 12|- S1 A6 -|6 74 11|- S2 A7 -|7 HC 10|- S3 A8 -|8 9 |- E +----------+

Functional Features

• CD74HC251MT is an 8-channel digital multiplexer/demultiplexer.
• It can select one of the eight input lines and route it to the output line.
• The selection is controlled by four select inputs (S0, S1, S2, S3).
• The enable input (E) allows the device to be enabled or disabled.

Advantages and Disadvantages

Advantages

• High-speed operation due to CMOS technology.
• Wide operating voltage range (2V to 6V).
• Low power consumption.
• Compatibility with both TTL and CMOS logic levels.
• Compact TSSOP package for space-saving designs.

Disadvantages

• Limited number of channels (8).
• Propagation delay may affect timing-sensitive applications.
• Not suitable for high-frequency applications.

Working Principles

The CD74HC251MT operates based on the principles of digital multiplexing and demultiplexing. When the enable input (E) is active, the select inputs (S0-S3) determine which of the eight data inputs (A1-A8) is connected to the output (Y). The selected input is then transmitted to the output line.

Detailed Application Field Plans

The CD74HC251MT can be used in various applications that require data routing and selection. Some potential application fields include:

1. Data communication systems
2. Digital signal processing
3. Multiplexed data transmission
4. Address decoding in microcontrollers
5. Data selection in memory systems

Alternative Models

Here are some alternative models that offer similar functionality to the CD74HC251MT:

1. SN74HC251N - DIP package, 8-channel digital multiplexer/demultiplexer.
2. MC74HC251N - DIP package, 8-channel digital multiplexer/demultiplexer.
3. CD4051BM - SOIC package, 8-channel analog multiplexer/demultiplexer.

These alternatives can be considered based on specific requirements and design constraints.

In conclusion, the CD74HC251MT is a versatile digital multiplexer/demultiplexer integrated circuit that offers high-speed operation, compatibility with various logic levels, and compact packaging. Its applications range from data communication systems to microcontroller address decoding. Designers can also consider alternative models based on their specific needs.