MM74HCT138MTCX

Product Overview

• Category: Integrated Circuit
• Use: Decoder/Demultiplexer
• Characteristics: High-Speed, CMOS Technology
• Package: TSSOP-16
• Essence: Decodes 3-to-8 Line
• Packaging/Quantity: Tape and Reel, 2500 pieces per reel

Specifications

• Supply Voltage: 2V to 6V
• Input Voltage: 0V to VCC
• Output Voltage: 0V to VCC
• Maximum Operating Frequency: 25MHz
• Propagation Delay: 15ns (typical)
• Low Power Consumption: 4µA (typical)

Detailed Pin Configuration

The MM74HCT138MTCX has a total of 16 pins. The pin configuration is as follows:

1. GND - Ground
2. A0 - Address Input 0
3. A1 - Address Input 1
4. A2 - Address Input 2
5. /G1 - Enable Input
6. Y0 - Output 0
7. Y1 - Output 1
8. Y2 - Output 2
9. Y3 - Output 3
10. Y4 - Output 4
11. Y5 - Output 5
12. Y6 - Output 6
13. Y7 - Output 7
14. VCC - Supply Voltage
15. /G2A - Enable Input
16. /G2B - Enable Input

Functional Features

The MM74HCT138MTCX is a high-speed CMOS decoder/demultiplexer integrated circuit. It decodes a 3-bit binary address to an 8-line output. The enable inputs (/G1, /G2A, /G2B) control the operation of the decoder. It operates on a supply voltage range of 2V to 6V and has a maximum operating frequency of 25MHz. The propagation delay is typically 15ns, making it suitable for high-speed applications.

Advantages and Disadvantages

Advantages: - High-speed operation - Low power consumption - Wide supply voltage range - Compact TSSOP-16 package

Disadvantages: - Limited number of address inputs (3-bit)

Working Principles

The MM74HCT138MTCX works by decoding the binary address inputs (A0, A1, A2) and enabling the corresponding output line based on the input combination. The enable inputs (/G1, /G2A, /G2B) control the overall operation of the decoder. When the enable inputs are active, the selected output line goes low while all other output lines remain high. This allows the user to select one of the eight output lines based on the input address.

Detailed Application Field Plans

The MM74HCT138MTCX is commonly used in various digital systems where decoding and demultiplexing functions are required. Some of the application fields include:

1. Address Decoding: It is used to decode memory addresses in microcontrollers and microprocessors.
2. Data Demultiplexing: It can be used to demultiplex data from a single line to multiple output lines in communication systems.
3. LED Matrix Control: It is utilized to control LED matrices by selecting specific rows/columns based on the input address.
4. Display Drivers: It can be employed as a display driver to control multiple segments or digits in numeric displays.

Detailed and Complete Alternative Models

1. 74HC138: Similar functionality with TTL logic levels.
2. CD74HCT138E: DIP-16 package alternative.
3. SN74HCT138N: DIP-16 package alternative with wider supply voltage range.

These alternative models provide similar decoding and demultiplexing functionality, but may differ in package type, supply voltage range, or logic levels.

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