74AC374PC

Max Propagation Delay @ V, Max CL:	9.5ns @ 5V, 50pF
Base Part Number:	74AC374
Package / Case:	20-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 85°C (TA)
Input Capacitance:	4.5pF
Current - Quiescent (Iq):	40µA
Voltage - Supply:	2 V ~ 6 V
Current - Output High, Low:	24mA, 24mA
Trigger Type:	Positive Edge
Series:	74AC
Clock Frequency:	155MHz
Number of Bits per Element:	8
Number of Elements:	1
Output Type:	Tri-State, Non-Inverted
Type:	D-Type
Function:	Standard
Part Status:	Obsolete
Packaging:	Tube

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74AC374PC Application Field and Working Principle

Introduction

The 74AC374PC is an octal D-type flip-flop with complementary outputs, designed for logic-circuit applications that require low propagation delay. This device belongs to the AC logic family and uses TTL-compatible input and output levels.

Logic - Flip Flops

Flip flops are devices consisting of two stable logic states which allow for information to be stored and retrieved. They are one of the most basic components of any digital circuit and can be used as memory components like memory registers. One example of a flip-flop is a D-type flip-flop. A D-type flip-flop is an edge activated bistable device which stores one bit of data at a time. In other words, it is a device that can remember one bit of information indefinitely. The 74AC374PC is a 8-bit octal D flip-flop with complementary outputs.

74AC374PC Working Principle

The 74AC374PC is an octal D-type flip-flop with complementary outputs that are designed to be used in logic circuits which require low propagation delay. It has 8 data inputs, 8 data outputs, one clock input (CK), and 8 control inputs (CE and nCE). There is also a Set input (S) and a Reset input (R) which will set or reset all the flip-flops to either a 0 or 1 state respectively, regardless of the state of the clock. The 74AC374PC also has a cycle operation feature. This allows the user to have the outputs of one stage drive the inputs of the next. This can be done by connecting the Q0* output of the first stage to the D7input of the next stage and the Q7 output of the first stage to the D0 input of the next stage, so that the output of the first stage will be shifted to the right, and the output of the second stage will be shifted to the left. When the CK is low and CE is high, it allows the input to be accepted and stored on the rising edge of CK. When the CK is low, the output will remain unchanged until the rising edge of CK which will cause the output to change to the state of the data input. When the CK is high, the internal circuit will reset itself based on the value of the SET and RESET inputs. When SET is low and RESET is high, all of the flip-flops will be set to a logical “1”. When SET is high and RESET is low, all of the flip-flops will be set to a logical “0”. The 74AC374PC can also be used for synchronous parallel transceiving operations. In this mode, each D input is connected to the corresponding Q output. This allows for data to be shifted from one flip-flop to the other on each rising edge of the clock.

Conclusion

The 74AC374PC is an octal D-type flip-flop with complementary outputs which can be used to store and recall information in digital circuits. It has 8 data inputs, 8 data outputs, one clock input, 8 control inputs, a Set input and a Reset input. This device’s features include its low propagation delay, cycle operation, and synchronous parallel transceiving operation capabilities. This makes the 74AC375PC an ideal device for logic-circuit applications which require an efficient and reliable memory component.

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