MM74HCT574SJ

Max Propagation Delay @ V, Max CL:	30ns @ 5V, 50pF
Base Part Number:	74HCT574
Package / Case:	20-SOIC (0.209", 5.30mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Input Capacitance:	10pF
Current - Quiescent (Iq):	8µA
Voltage - Supply:	4.5 V ~ 5.5 V
Current - Output High, Low:	7.2mA, 7.2mA
Trigger Type:	Positive Edge
Series:	74HCT
Clock Frequency:	33MHz
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Part Status:	Obsolete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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Introduction

MM74HCT574SJ is a high-speed silicon-gate CMOS logic device that provides a general purpose, 8-bit storage latch with complementary outputs. It is used in a variety of applications, from producing latched outputs to providing address decoding. This versatile device receives three-state data, clock and control inputs, can be cascaded with other 8-bit latches, and offers a wide range of configurations depending on the number of cascaded stages. It also allows logic levels to determine when data is to be latched and can be used to provide dual port memories.

Features

MM74HCT574SJ has a number of features which make it an ideal choice for many applications. It has an operating voltage of 2.0 volts to 6.0 volts and a high noise immunity characteristic of greater than 1.2V. It also has a low standby current of less than 1uA and clock relay, which helps reduce power dissipation. The device has built-in protection against incorrect bit sequencing, as well as against excessive current on the output pins. It also offers a wide range of outputs, including open-drain, totem-pole and CMOS, as well as output multiplexers.

Application Field

MM74HCT574SJ is suitable for a variety of applications and is used extensively in logic based systems. It can be used for address decoding, and is often used to store digital data in logic devices such as microprocessor based systems. The device is also suitable for use in logic gates and multiplexers, where it can be used as a data latch or as an address decoder. The device also finds use in memory circuits.

Working Principle

The working principle of MM74HCT574SJ is based on having two enable pins, a clock and a data input. The two enable inputs determine the state of the latch. When the two enable inputs are active (logic high), the latch is enabled and data is transferred from the data input to the output pins. This is done on the rising edge of the clock pulse. When the enable inputs are inactive (logic low), the latch is disabled and the output pins remain in their previous state. The clock input is used to determine when the data is to be latched. The data input is used to store data into the latch and the output pins provide the stored data. The MM74HCT574SJ device can also be used as a dual port memory, in which data can be written to one port and read from the other.

Conclusion

The MM74HCT574SJ is a versatile device which is used in a variety of applications, from providing address decoding and data storage to producing latched outputs. It has a number of features which make it an ideal choice for many applications, such as a low standby current, wide range of outputs, protection against bit sequencing and excessive current. The working principle of the device is based on two enable pins, a clock and a data input, which are used to determine when data is to be latched and stored.

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