SN74ACT564DBR Integrated Circuits (ICs)

Max Propagation Delay @ V, Max CL:	10.5ns @ 5V, 50pF
Base Part Number:	74ACT564
Package / Case:	20-SSOP (0.209", 5.30mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Input Capacitance:	4.5pF
Current - Quiescent (Iq):	4µA
Voltage - Supply:	4.5 V ~ 5.5 V
Current - Output High, Low:	24mA, 24mA
Trigger Type:	Positive Edge
Series:	74ACT
Clock Frequency:	90MHz
Number of Bits per Element:	8
Number of Elements:	1
Output Type:	Tri-State, Inverted
Type:	D-Type
Function:	Standard
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

SN74ACT564DBR is a 4-Bit magnitude comparator which combines multiplexer and decoder functions with fast response. It is designed for applications such as process control, instrumentation and robotics. Through various combinations of address lines, the part may be used to drive an output when the address of an incoming signal matches a set value. SN74ACT564 DBR can be divided into four independent channels, each of which can compare up to 4 different digital codes.

Application field

SN74ACT564DBR devices are widely used in intelligent sensing, control and data management system. They can be used in digital communication systems to detect specific signals and control the system through related processes. It is also used as a flag device in a robotic system. It can also be used in consumer products such as power management systems, HVAC (heating, ventilation, and air conditioning) systems, voltage monitors, and remote control instruments.

Working principle

The SN74ACT564DBR comprises an array of up to 4 multiplexers and 4 decoders connected in parallel, which is driven by four common external data input lines (A0, A1, A2, and A3). When the corresponding address numbers on the data lines are matched, the decoder will issue a 1-to-4 logic "enable" output. Thus, when the address numbers on the external data line match the address numbers of the internal address, the output waveform will be set. In this way, the matching address can control the input waveform, and realize the function of the device.

Logic - Flip Flops

The SN74ACT564DBR is based on a logic-toggle flip flop architecture, which is basically a circuit with a single input (clock signal) and single output (data signal) that stores any digital data applied to it. By circuits of this type, the digital data is not lost and is available during the next clock signal. The operation of the SN74ACT564DBR flip flop can be broken into two parts. The first part consists of an internal multiplexer, which has 4 inputs and 4 outputs. Each of the 4 outputs (Q0-Q3) gets the input data from one of the 4 inputs (A0-A3) depending on the data recognized applied the 4 common inputs. The second part consists of 4 equal decoders, with 4 outputs (Q0-Q3) and 4 inputs (A0-A3). When the 4 common inputs are matched with the 4 internal address of the decoder, the corresponding output (Q0-Q3) will be in "Enable" status. Through this design, the SN74ACT564DBR is able to compare 4 different digital codes and output the results depended on the data being recognised.

Conclusion

In conclusion, SN74ACT564DBR are widely used for applications such as process control, instrumentation and robotics. It is a 4-Bit magnitude comparator which combines multiplexer and decoder functions integrated in a logic flip-flop architecture. It can compare up to 4 different digital codes and output the results depended on the data being recognised.

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