74AC374B

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:	-55°C ~ 125°C (TA)
Input Capacitance:	4pF
Current - Quiescent (Iq):	4µA
Voltage - Supply:	2 V ~ 6 V
Current - Output High, Low:	24mA, 24mA
Trigger Type:	Positive Edge
Series:	74AC
Clock Frequency:	270MHz
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Part Status:	Obsolete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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74AC374B Application Field and Working PrincipleThe 74AC374B is a quad D-type flip-flop integrated circuit, and is part of the vast AC family of logic functions designed by the Texas Instruments Corporation. It is typically used in digital systems and applications such as frequency dividers, shift registers, and state machines in digital circuits. Due to its wide range of uses and its very attractive cost, the 74AC374B is not only widely used but is easily the most popular flip-flop integrated circuit on the market.What is a Flip-Flop?A flip-flop is a logic device that is used to store information. It behaves like a toggle switch that can either be set or reset and which can store or maintain a logic state when the input signal is changed. Flip-flops are found in all kinds of digital circuits from basic logic gates to more complex systems such as calculators, computers and other electronic instruments.The Basics of the 74AC374BThe 74AC374B integrated circuit contains four D-type flip-flops, each with an asynchronous reset input (RESET1-4) and a complementary asynchronous output (Q-/Q). The clear input (CLR) allows the user to clear all of the flip-flops on the chip simultaneously. All of the flip-flops are edge-triggered on the positive edge of the clock signal, and data is loaded into the flip-flops (namely, into the data inputs (D1-4)) on the falling edge of the clock signal.The 74AC374B integrated circuit operates within the voltage range of 3 to 18 volts, which is a wide range that makes the chip useful in just about any digital circuit. Furthermore, the flip-flops on the chip typically have a propagation delay of 8ns (nanoseconds) or better, which can be a major advantage when speed is a concern.Working Principle of the 74AC374BThe 74AC374B operates on the principle of positive edge-triggered flip-flops. On the positive edge of the clock pulse (CLK, also known as the rising edge), all of the data inputs (D1-4) that had been received during the falling edge of the clock will now be stored and are latched into the corresponding flip-flop outputs, namely Q1-4 and Q-/Q1-4.When a clear (CLR) input is received, all of the flip-flops on the chip will be cleared simultaneously. The RESET inputs, when asserted low, will cause the corresponding outputs to immediately assume a reset state (namely, reset all output logic states to be low) regardless of the state of the clock.ConclusionThe 74AC374B integrated circuit is a versatile and widely-used quad D-type flip-flop chip, so much so that it is arguably the most popular flip-flop IC on the market. It is easily integrated into systems and ideas due to its very attractive cost, wide voltage range and fast propagation delay of 8 ns or better. The chip operates on the positive edge-triggered flip-flop principle and features asynchronous reset inputs (RESET1-4) as well as a clear input for resetting all outputs at once (CLR). With its many features and sheer popularity, it is easy to see why the 74AC374B is one of the most widely-used flip-flop integrated circuits on the market.

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