SN74HCT574PWG4

Max Propagation Delay @ V, Max CL:	47ns @ 5.5V, 150pF
Base Part Number:	74HCT574
Package / Case:	20-TSSOP (0.173", 4.40mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Input Capacitance:	3pF
Current - Quiescent (Iq):	8µA
Voltage - Supply:	4.5 V ~ 5.5 V
Current - Output High, Low:	6mA, 6mA
Trigger Type:	Positive Edge
Series:	74HCT
Clock Frequency:	40MHz
Number of Bits per Element:	8
Number of Elements:	1
Output Type:	Tri-State, Non-Inverted
Type:	D-Type
Function:	Standard
Part Status:	Active
Packaging:	Tube

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Introduction

SN74HCT574PWG4 is a 8-bit flip flop logic device, and it belongs to the family of HCT logic chips. The device provide a simple, low cost and convenient way to realize a larger set of flip-flops than any discrete units can offer. HCT family of devices offer compatible electrical characteristics and unified basic performance parameters, which make it an ideal choice for system-level designs.

Application Fields

SN74HCT574PWG4 is a versatile device that can be used in a variety of digital control applications. Examples of applications include delay line counters, multiplexer/demultiplexer systems, programmable logic devices, concatenated shift registers and data communications systems. In general, devices of this type are used whenever multiple flip-flops are required or when a high speed data transfer rate is needed.The SN74HCT574PWG4 can also be used in high frequency data transmission applications, such as Ethernet networks and local area networks, due to its low skew and low jitter. In addition, this device can be used in pulse-width modulation (PWM) systems for power control, as well as for programmable logic controllers (PLCs).

Working Principle

SN74HCT574PWG4 employs a basic set/reset flip flop circuit consisting of two latches connected in series and a pair of clock inputs. When either one of the clocks is asserted, the data stored in either latch is transferred to the other latch. This transfer is done in a synchronous manner which allows the flip-flop to retain its data during transitions of the clock signal. The data on a given latch is stored in a set of eight NAND gates, each of which is connected to the X and Y inputs of the latch. If the X input is high and the Y input is low, the output of the associated NAND gate will become high, indicating that the flip flop is in a Set state. Conversely, if the X input is low and the Y input is high, the output of the associated NAND gate will be low, indicating that the flip flop is in a Reset state. These set and reset conditions are maintained until the clock signal transitions.

Conclusion

SN74HCT574PWG4 is an 8-bit flip flop device that can be used in many digital control applications. It is often employed for high data transmission applications such as Ethernet and LAN networks due to its inherent low skew and low jitter. The device works by using a set/reset flip flop circuit which consists of two latches and a pair of clock inputs. Upon a transition of the clock signal, the data in either latch is transferred to the other. This synchronous method of data transfer allows the flip-flop to retain its data since it transfers the data in a predictable manner.

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