74VHC244MX

Series:	74VHC
Packaging:	Tape & Reel (TR)
Part Status:	Active
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:	8mA, 8mA
Voltage - Supply:	2 V ~ 5.5 V
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	20-SOIC (0.295", 7.50mm Width)
Supplier Device Package:	20-SOIC
Base Part Number:	74VHC244

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Introduction

The 74VHC244MX is an 8-bit buffer and line receiver with error detection created by Texas Instruments. It is manufactured in various technical packages such as SOIC, TSSOP and others that are specified by the TI datasheet. It comes with standard industrial temperature range of -40°C to 85°C, and is relatively resistant to ESD threat. The device is composed of a single 8-bit buffer, an 8-line receiver and an error checking receiver. The buffers, receivers and associated error detection circuitry are designed to provide immunity to noise, eliminating the need for separate ESD protection circuitry.Application Field

74VHC244MX is ideal for application in remote system communications. It is designed to be used in asynchronous data transmission over a network or a two-wire interface and is optimized for use in high speed, high reliability industrial environments. For instance, it can be used to transfer serial data between two devices. The buffer and the line receiver are used to buffer, receive and maintain a steady state for data transmission. This application provides reliable performances to maintain reliable information transfer speeds. The 74VHC244MX is also suitable for use as an interface IC for other logic ICs. It can be used as a switch for data transmission or as an address or data selector for memory access. For example, in an application involving a microcontroller and an 8-bit memory, the 74VHC244MX can be used as the interface between the two ICs. The microcontroller outputs its address and data selection to the 74VHC244MX which in turn acts as a switch to interpret the selections and output the correct address and data to the memory IC.Working Principle

The 74VHC244MX works on the principles of differential signal reception and buffering. Differential signals sent by transceivers are converted by the receiver of the 74VHC244MX into TTL compatible logic schemes. This buffering allows data transmissions to be isolated from one another and reduces line interference.The signal received by the receiver is divided into three kinds of states by the error detection circuitry. The three states are valid logic ‘1’ and ‘0’ and invalid logic ‘x’. The signal logic ‘1’ is defined as a voltage level higher than two thirds of the power supply voltage and logic ‘0’ is defined as a voltage level lower than one third of the power supply voltage. Any signal outside of the two defined voltage ranges will be received as an invalid signal ‘x’. The output of the buffer is TTL compatible and the receiver outputs valid state ‘1’ and ‘0’. The 8-bit buffer consists of sixteen buffers, eight of which are enabled by asserting the direction pin to ‘1’ and eight of which will be enabled by asserting it to ‘0’. The eight buffers are powered by the same power supply and have the same input and output voltage level.Conclusion

The 74VHC244MX is an 8-bit buffer and line receiver with error detection suitable for remote system communications and interface IC for other logic ICs. It works on the principles of differential signal reception and buffering. Differential signals sent by transceivers are converted by the receiver of the 74VHC244MX into TTL compatible logic schemes and the 8-bit buffer consists of sixteen buffers. The device provides reliable performance to maintain reliable information transfer speeds, and is relatively resistant to ESD threat.

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