CD74AC74ME4

Max Propagation Delay @ V, Max CL:	10ns @ 5V, 50pF
Base Part Number:	74AC74
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 125°C (TA)
Input Capacitance:	10pF
Current - Quiescent (Iq):	4µA
Voltage - Supply:	1.5 V ~ 5.5 V
Current - Output High, Low:	24mA, 24mA
Trigger Type:	Positive Edge
Series:	74AC
Clock Frequency:	110MHz
Number of Bits per Element:	1
Number of Elements:	2
Output Type:	Differential
Type:	D-Type
Function:	Set(Preset) and Reset
Part Status:	Active
Packaging:	Tube

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CD74AC74ME4 Application Field and Working Principle

Introduction

The CD74AC74ME4 is a type of flip-flop that belongs to the category of logic-flip-flops. It has two optimized sections – a set/reset section and a master-slave section. It is designed to offer high speed and low power consumption when used in designs with AC or DC power supplies. This productivity makes it a popular choice for various application fields.

Overview

The CD74AC74ME4 is an asynchronous reset/set flip-flop. It comes in a standard 14-pin plastic-dual-in-line package (PDIP) and features an internal feedback network. This network allows the device to be used in a variety of applications that require a state-stable output. It has two input pins, one for the data (input) and another for the clock (input), and two output pins for the set and reset. The internal circuitry of the CD74AC74ME4 provides for a better performance in comparison to usual controller-based reset/set models. These internal logic gates and transistors are hand-selected and programmed to ensure higher speed and low power consumption.The CD74AC74ME4 can function in temperatures ranging from -55 to +125 Celsius and it is characterized for operation from 0 to 70 Celsius. The propagation delay time of the device is typically 16ns while the typical supply voltage is 5 volts.

Applications

The primary application of the CD74AC74ME4 is in data processing and logic circuits. It is used to provide a set/reset capability in various microcontroller-based applications such as in industrial automation systems, motor control, process control applications and instrumentation systems. It is also used in combinational logic applications, such as addition and subtraction, shifting and logic functions, as well as in memory systems, such as ROM\'s and RAM\'s. The CD74AC74ME4 can also be used in higher performance systems such as digital cellular phones, wireless communication systems, digital cameras and digital video recorders. The CD74AC74ME4 can also be used as a level-shifter in analog/digital circuits. This allows data from one voltage plane to be shifted to a compatible voltage plane, allowing for the mixing and matching of digital circuits from different technologies.

Working Principle

The main concept behind the working principle of the CD74AC74ME4 is that the set and reset are caused by input pins which are triggered by a clock. The reset and set pins provided by the flip-flop work together to control the operation of the output of the device. The reset and set pins of the CD74AC74ME4 are connected to each other by two internal logic gates. A positive-going pulse on the clock input allows the set voltage to be applied to the reset output, which in turn causes a negative-going pulse on the reset output. Similarly, a negative-going pulse on the clock input causes the reset voltage to be applied to the set output, which thus produces a positive-going pulse on the set output.The operation of the CD74AC74ME4 is based on the availability of two stable states at its output, either set or reset state. That is why this flip-flop is a type of bistable switch. When used in combination with logic gates, the CD74AC74ME4 can act as a memory element by storing digital values.

Conclusion

The CD74AC74ME4 is a type of logic-flip-flop which can be used in a multitude of applications due to its capability to provide a set/reset function and its ability to be used in both AC and DC power supplies. It has two optimized sections – a set/reset section and a master-slave section, and it is characterized for operation from 0 to 70 Celsius with a typical supply voltage of 5 volts. Its primary applications are in data processing and logic circuits, industrial automation systems, memory systems, digital cellular phones, wireless communication systems and digital cameras. The CD74AC74ME4 operates by receiving clock pulses at its input pins which then cause the set/reset pins to produce a corresponding voltage pulse output at the device\'s output pins.

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