74LCX574FT

Max Propagation Delay @ V, Max CL:	8.5ns @ 3.3V, 50pF
Package / Case:	20-TSSOP (0.173", 4.40mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Input Capacitance:	7pF
Current - Quiescent (Iq):	10µA
Voltage - Supply:	1.65 V ~ 3.6 V
Current - Output High, Low:	24mA, 24mA
Trigger Type:	Positive Edge
Series:	74LCX
Clock Frequency:	150MHz
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:	Tape & Reel (TR)

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Introduction

The 74LCX574FT is a static, synchronous, edge-triggered, flip-flop device, commonly referred to as a logic flip-flop. It is suitable for general logic, signal conditioning and data transmission applications. This device is designed to be used in systems requiring a single, two state, high-speed, edge-sensitive output with diagnostic outputs for error detection. It consumes minimal power levels when operating from a single power supply and its high drive capability eliminates the need for additional stages of logic.

Application Field

The 74LCX574FT is particularly useful for discriminating between two signals — a master signal and a slave signal. In many cases, this device will act as a set-reset latch where the master signal is the enable input, while the slave signal is the clock input. The device will respond in this mode when the enable input is active low, while the clock transition occurs. The 74LCX574FT is also very useful in storing data, as it can be used to buffer data up or down in order to read or write information at much lower latencies. Furthermore, the device can also used in applications where clock line regeneration is needed due to long transmission lines.

Working Principle

The 74LCX574FT is designed to operate as a master-slave flip-flop. This means that the two inputs of the device are enabled only when the master input is active and the transition at the slave input occurs. The master clock determines the enabling level of the device, whereas the slave input determines the clocking edge. The device responds \'high\' only when the master and slave inputs are correctly aligned. This means that the device is a perfect fit for discriminating between two signals.The device also has a direct and a complementary output that are enabled when the device is in \'high\' state. The direct output is a positive output, meaning it is driven to a high level when enabled. Likewise, the complementary output is driven to a low level when enabled.The 74LCX574FT is also equipped with two diagnostic outputs, namely the NAND output and the Inverting output. The NAND output is a logic signal of active low when both inputs of the device are enabled, the Inverting output is a logic signal of active low when at least one of the inputs of the device is enabled. These outputs are used as status or fault indicators.

Conclusion

The 74LCX574FT is a static, synchronous, edge-triggered, flip-flop device with two diagnostic outputs for error detection. This makes it particularly useful for discriminating between two signals, buffering data up or down and for clock line regeneration. It is ideal for applications requiring a single, two state, high-speed, edge-sensitive output.

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