MM74HC244N

Series:	74HC
Packaging:	Tube
Part Status:	Obsolete
Logic Type:	Buffer, Non-Inverting
Number of Elements:	2
Number of Bits per Element:	4
Input Type:	--
Output Type:	3-State
Current - Output High, Low:	7.8mA, 7.8mA
Voltage - Supply:	2 V ~ 6 V
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Through Hole
Package / Case:	20-DIP (0.300", 7.62mm)
Supplier Device Package:	20-PDIP
Base Part Number:	74HC244

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1. Introduction

The MM74HC244N is a logic-level device produced by ON Semiconductor. It belongs to a family of logic-level devices known as Logic - Buffers, Drivers, Receivers, Transceivers and is used in a wide variety of communication and signal processing circuits. This chip is based on standard CMOS components and is capable of operating from a single positive power supply, ranging from 3V to 18V. It can sink or source up to 10mA per output pin and can run at rates of up to 75MHz.This section will discuss the MM74HC244N application field and working principle in detail.

2. Application Field of the MM74HC244N

The MM74HC244N has a wide range of applications including:

• As an octal buffer / line driver, the MM74HC244N can be used to drive multiple output lines with a single input signal.
• As a receiver, the MM74HC244N can be used to receive multiple input signals with a single output line.
• As an active bus driver, the MM74HC244N can be used to drive bus signals with a common data signal.
• As a transceiver, the MM74HC244N can be used to exchange data between different networks.
• As a logic gate, the MM74HC244N can be used to implement logic functions.

3. Working Principle of the MM74HC244N

The MM74HC244N is a CMOS based device and its basic working principle can be understood by examining each component inside the chip. At the heart of the MM74HC244N is an eight input NAND gate with eight outputs. The eight inputs of the NAND gate are controlled by four dual-input gates.The four dual-input gates are configured as two inverters and two non-inverting buffers. The inverters can be used in either a series or parallel configuration while the two non-inverting buffers can drive two independent signal lines.The output of the eight NAND gates is then fed through a series of logic-level drivers to the output lines. The drivers are used to amplify the signals from the NAND gate to a level suitable for wide operation.

4. Conclusion

The MM74HC244N is a versatile device capable of being used as an octal buffer / line driver, receiver, active bus driver, transceiver and logic gate. Its CMOS based design makes it suitable for a wide range of applications. Its distinct working principle of using an eight input NAND gate with eight outputs and four dual-input gates make it a reliable device for anyone looking for high-performance logic-level devices.

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