74HC243D,118

Series:	74HC
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Logic Type:	Transceiver, Non-Inverting
Number of Elements:	1
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 ~ 125°C (TA)
Mounting Type:	Surface Mount
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	14-SO
Base Part Number:	74HC243

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Introduction

The 74HC243D is an integrated circuit (IC) designed and manufactured by Holtek Semiconductor Inc. It is a functional building block used to implement logic functions in a wide range of electronic applications. The device is classified as a Logic - Buffers, Drivers, Receivers, Transceivers and offers a wide range of features including:•Direct Connection of TTL/CMOS Inputs•High-Speed CMOS Process Technology•Bus Settling Times Under 5 ns•Outputs Disconnectable from VCC•3.3V to 5V System Interface•3-State Outputs•Outputs Available in Open Collector and Totem-Pole•Wide Operational Temperature Range•Low Power Dissipation•Operating Voltage Range up to 5V

Application Field

The 74HC243D integrated circuit can be used in a variety of applications such as:•Computer peripherals •Telecommunications systems•Digital logic controllers•Audio and video equipment•Medical instruments•Robotics•Industrial and process control systems•Data acquisition and processing•Automotive systems

Working Principle

The 74HC243D has separate inputs and outputs for clock (CK) and enable (EN). It is also equipped with three-state outputs that provide a high-impedance to three-state interface.In an active low operation, when EN goes low, the outputs will sink current and when EN goes high, the outputs will go into their high-impedance state. Through this setup, the 74HC243D can be used as an address decoder, bus driver, buffer and gate.When used as a bus driver, the 74HC243D can provide a low impedance interface between two buses operating at different voltage levels. Upon receiving an active low clock pulse, the IC will take the inputs at the rising edge of the clock and transfer them to the outputs, while also latching all of the inputs in the process. This ensures that the outputs have a valid value when the low clock pulse is not active.When used as an address decoder, the IC will sample the inputs for valid data and create an active low output for a valid address. If an address is not present, the output will be in a high-impedance state.

Conclusion

The 74HC243D is a versatile IC which can be used in multiple application fields such as computer peripherals, telecommunication systems, and automotive systems. Its operation is based on three-state outputs and active low operation. In it, clock and enable function and inputs latched by clock. With the correct configuration, it can be used as an address decoder, bus driver, buffer, or gate. The features of this device make it an ideal choice for many applications.

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