Series:	74HCT
Packaging:	Tube
Part Status:	Active
Logic Type:	Transceiver, Non-Inverting
Number of Elements:	1
Number of Bits per Element:	8
Input Type:	--
Output Type:	3-State
Current - Output High, Low:	6mA, 6mA
Voltage - Supply:	4.5 V ~ 5.5 V
Operating Temperature:	-40°C ~ 125°C (TA)
Mounting Type:	Surface Mount
Package / Case:	20-SOIC (0.295", 7.50mm Width)
Supplier Device Package:	20-SO
Base Part Number:	74HCT245

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Logic Buffers, Drivers, Receivers, Transceivers: 74HCT245D,652 application field and working principle

Introduction

The 74HCT245D,652 are high-speed CMOS logic devices combining the characteristics of low power dissipation and high noise immunity. These digital logic buffers and line drivers are designed to improve overall signal integrity by providing true-to-PECL, high state-to-ground interface capability. 74HCT245D,652 is capable of operating with logic levels down to VDD/3, allowing line drivers to be used in digital systems with logic voltage levels as low as 3.3V while still providing the high-current drive capabilities of larger-voltage logic families.

Application Field

The 74HCT245D,652 can be used for various purposes ranging from low power and low noise line or bus drivers in digital systems to clock buffers, address buffers, or signal transceivers for high speed data transmission. The 74HCT245D,652 have the combination of features that make them particularly suitable for use in high speed transmission systems. These include low power consumption, low logic level shifting down to VDD/3 as well as enhanced noise immunity due to the high current drive capability.

Data Channels

The 74HCT245D,652 can be employed in either unidirectional, or bidirectional applications. The device contains two independent 100 ohm differential output channels that can be used for either transmitting or receiving (A and B). Each channel is capable of being used as a data lane and can switch between input and output mode as needed.

Clock Signal Buffers

The 74HCT245D,652 can also be used as a clock signal buffer. The differential drive capability of the device and the low power consumption allow for transmission of clock signals with minimal skew between components. This is particularly useful for high speed systems, such as those used for Ethernet communication or for time critical clock pulses regularly.

Working Principle

The 74HCT245D,652 is based on complementary metal–oxide–semiconductor (CMOS) technology. In a CMOS system, transistors, switches or electronic components are used as the elements responsible for controlling logic states. This device is a dual-output line driver, meaning it is designed to take in data, amplify it, and then transmit it along two outputs (A and B).The device is made up of several transistors, some of which are responsible for input and output, while others are responsible for switching and amplifying the signal. The operation of each individual transistor is fairly simple, but when combined together they form the complex circuit that allows the more fine grained operation of the device as a whole.For each of the channels (A and B), several different transistors function together to keep the two outputs in phase with each other. The dual-output line driver works by first amplifying the input signal so that it is strong enough to drive both output lines. Once this has been done, the transistors in the device come into play, allowing the signal to be switched between the two outputs with minimal noise or distortion.

Conclusion

The 74HCT245D,652 are high-speed logic buffers and line drivers with enhanced noise immunity, low power dissipation and low logic level shifting. These features make them particularly useful for various applications, such as low power line drivers, clock buffers, address buffers, or signal transceivers for high speed data transmission. The device consists of several transistors, which function together to amplify and switch the input signal to the two outputs.

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