CY74FCT138ATSOC

series introduction

# Introduction to the CY74FCT138ATSOC Product Series

## 1. Overview
The CY74FCT138ATSOC is a highly versatile and reliable product series that belongs to the family of logic devices. These devices are designed to meet the demanding requirements of modern digital systems, offering a combination of high - speed performance, low power consumption, and excellent signal integrity. They are widely used in a variety of applications, including telecommunications, computer systems, industrial automation, and consumer electronics.

## 2. Key Features

### 2.1 High - Speed Operation
One of the most prominent features of the CY74FCT138ATSOC series is its high - speed performance. These devices are capable of operating at very high clock frequencies, which makes them suitable for applications where fast data processing and signal propagation are crucial. The fast switching times ensure that the device can handle rapid changes in input signals, enabling seamless integration into high - speed digital circuits.

### 2.2 Low Power Consumption
In today's energy - conscious world, power efficiency is a top priority. The CY74FCT138ATSOC series is designed with low power consumption in mind. It uses advanced semiconductor manufacturing processes and circuit design techniques to minimize power dissipation while maintaining high performance. This not only helps in reducing the overall power consumption of the system but also extends the battery life in portable devices.

### 2.3 Wide Operating Voltage Range
The devices in the CY74FCT138ATSOC series support a wide operating voltage range. This flexibility allows them to be used in different power supply environments, making them compatible with a variety of systems. Whether it is a low - voltage battery - powered device or a high - voltage industrial system, these devices can operate reliably within the specified voltage range.

### 2.4 Excellent Signal Integrity
Signal integrity is essential for the proper functioning of digital circuits. The CY74FCT138ATSOC series is engineered to provide excellent signal integrity. It has built - in features such as impedance matching and noise suppression to minimize signal distortion and interference. This ensures that the output signals are accurate and reliable, even in noisy electrical environments.

### 2.5 TTL/CMOS Compatibility
These devices are compatible with both TTL (Transistor - Transistor Logic) and CMOS (Complementary Metal - Oxide - Semiconductor) logic levels. This compatibility makes it easy to interface the CY74FCT138ATSOC series with other logic devices in a system, providing designers with greater flexibility in circuit design.

## 3. Functional Description

### 3.1 Decoder Function
The CY74FCT138ATSOC is primarily a 3 - to - 8 line decoder. It takes three binary input signals (A0, A1, A2) and decodes them into eight output signals (Y0 - Y7). Based on the combination of the input signals, one of the eight output lines is selected and driven low, while the remaining output lines are held high. This decoding function is widely used in address decoding in memory systems, multiplexing applications, and control signal generation.

### 3.2 Enable Inputs
The device has three enable inputs (E1, E2, E3). These enable inputs are used to control the operation of the decoder. Only when the enable conditions are met (E1 is low, E2 is low, and E3 is high), the decoder will function properly. Otherwise, all the output lines will be held high, effectively disabling the decoder. This feature provides an additional level of control and flexibility in system design.

## 4. Package and Pinout
The CY74FCT138ATSOC series is available in a variety of package options, such as the small - outline integrated circuit (

Images for reference

16 SOIC

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Datasheets

• CY54,74FCT138T
• PDF 2
• PDF 3

Partlist