MC74VHCT138ADR2

Product Overview

• Category: Integrated Circuit (IC)
• Use: Decoder/Demultiplexer
• Characteristics: High-Speed, Low-Power, 3-to-8 Line Decoder
• Package: SOIC-16
• Essence: The MC74VHCT138ADR2 is a decoder/demultiplexer IC that converts a binary input into one of eight outputs based on the input code.
• Packaging/Quantity: The MC74VHCT138ADR2 is available in a standard SOIC-16 package and is typically sold in reels of 2500 units.

Specifications

• Supply Voltage: 2.0V to 5.5V
• Input Voltage: 0V to VCC
• Output Voltage: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay: 7 ns (typical)
• Output Current: ±6 mA
• Input Capacitance: 3 pF (typical)

Pin Configuration

The MC74VHCT138ADR2 has a total of 16 pins arranged as follows:

+---+--+---+ A0 --|1 +--+ 16|-- VCC A1 --|2 |-- Y0 A2 --|3 |-- Y1 GND --|4 |-- Y2 E1 --|5 |-- Y3 E2 --|6 |-- Y4 Y7 --|7 |-- Y5 Y6 --|8 |-- Y6 Y5 --|9 |-- Y7 Y4 --|10 |-- E2 Y3 --|11 |-- E1 Y2 --|12 |-- GND Y1 --|13 |-- A2 Y0 --|14 |-- A1 VCC --|15 |-- A0 +----------+

Functional Features

• Converts a 3-bit binary input into one of eight outputs.
• Active-low enable inputs (E1 and E2) allow for easy cascading of multiple ICs.
• High-speed operation with low power consumption.
• Schmitt-trigger inputs provide hysteresis, ensuring noise immunity.

Advantages and Disadvantages

Advantages: - High-speed operation allows for quick decoding of input signals. - Low-power consumption makes it suitable for battery-powered devices. - Easy cascading of multiple ICs using active-low enable inputs. - Noise immunity provided by Schmitt-trigger inputs.

Disadvantages: - Limited to 3-bit binary input, restricting the number of possible output combinations. - May not be suitable for applications requiring more complex decoding functionality.

Working Principles

The MC74VHCT138ADR2 operates based on the principle of binary decoding. The three input pins (A0, A1, and A2) accept a 3-bit binary code, which is then decoded to activate one of the eight output pins (Y0 to Y7). The active-low enable inputs (E1 and E2) control the operation of the decoder/demultiplexer, allowing for cascading of multiple ICs to achieve higher bit decoding.

Detailed Application Field Plans

The MC74VHCT138ADR2 can be used in various applications that require decoding or demultiplexing of binary signals. Some potential application fields include:

1. Address Decoding: Used in microcontrollers and memory systems to decode address lines and select specific memory locations.
2. Data Routing: Enables the selection of specific data paths in multiplexed systems, such as communication switches or data buses.
3. Display Control: Used in digital display systems to select different segments or digits based on input codes.
4. Signal Demultiplexing: Allows for the distribution of a single input signal to multiple output channels based on the input code.

Detailed and Complete Alternative Models

1. 74HC138: Similar 3-to-8 line decoder IC with slightly different electrical characteristics.
2. CD74HCT138E: High-speed CMOS decoder/demultiplexer with similar functionality.
3. SN74LS138N: TTL decoder/demultiplexer with active-low outputs and additional features.

These alternative models provide similar decoding functionality but may have differences in voltage levels, power consumption, or package types. It is important to consider the specific requirements of the application when selecting an alternative model.

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