74HC161PW,118

Timing:	Asynchronous/Synchronous
Base Part Number:	74HC161
Supplier Device Package:	16-TSSOP
Package / Case:	16-TSSOP (0.173", 4.40mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Voltage - Supply:	2V ~ 6V
Trigger Type:	Positive Edge
Count Rate:	48MHz
Series:	74HC
Reset:	Asynchronous
Number of Bits per Element:	4
Number of Elements:	1
Direction:	Up
Logic Type:	Binary Counter
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The 74HC161PW,118 is a presettable synchronous 4-bit binary counter with internal look-ahead carry. A low active enable LE input is provided for easy cascading. The contents of the 4-bit counter can be preset with a low active asynchronous master reset MR input. This device is capable of division ratios from 16 down to 2, and division by 1. The device is mainly used in logic - counters, dividers applications.

Application Field of 74HC161PW,118

The primary application of the 74HC161PW,118 is in the digital counter, clock and frequency division area. The device is mainly used for division of one clock pulse into N lower frequency clock pulses and counting operations in industrial control and measurement systems. The device is capable of division from 16 down to 2 and division by 1, making it applicable in applications such as high speed pulse synchronization, frequency division and pulse counting.

Working Principle of 74HC161PW,118

The 74HC161PW,118 is a 4 bit synchronous presettable binary counter which contains a look-ahead carry circuit. The LE input is active-low and enables cascading. It has an asynchronous low-active MR input which will reset the counter contents to its preset value.The device uses a 4-bit binary down-counter consisting of four synchronously clocked D-type flip-flop. Each clock pulse will cause the output of the modulo-16 counter to decrease by one count. On reaching zero, the counter is reset to the preset value which is the new initial value. A low active LE input enables cascading of the device by allowing the output T of the last counter in a series to become the clock input of the next counter without delay. The asynchronous MR input provides a low-active master reset which will preset the counter with the initial value stored in the internal memory. This preset value will remain until the next LE pulse.

Conclusion

From the above, it can be seen that the 74HC161PW,118 is a presettable synchronous 4-bit binary counter with internal look-ahead carry, mainly used in logic - counters, dividers applications. It is mainly used for division of one clock pulse into N lower frequency clock pulses and counting operations in industrial control and measurement systems. The device has an asynchronous low-active MR input which will reset the counter contents to its preset value and a LE input which enables cascading of the device.

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