MC74AC161MG

Timing:	Synchronous
Base Part Number:	74AC161
Supplier Device Package:	16-SOEIAJ
Package / Case:	16-SOIC (0.209", 5.30mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Voltage - Supply:	2V ~ 6V
Trigger Type:	Positive Edge
Count Rate:	167MHz
Series:	74AC
Reset:	Asynchronous
Number of Bits per Element:	4
Number of Elements:	1
Direction:	Up
Logic Type:	Binary Counter
Part Status:	Obsolete
Packaging:	Tube

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The MC74AC161MG is a 8-bit binary counter which can be used to count down or count up depending on a user-defined clock source. It is created with an advanced CMOS technology and is typically used in high-speed, low-power applications. The device is especially useful for applications in computers, industrial automation and telecommunications. In the logic family of counters, dividers, the MC74AC161MG device combines a standard synchronous architecture with low- voltage technology. This counter is designed to be operated from a single supply voltage of 3.3V, with a typical typical static power consumption of less than 200mW. The counter also has an extended range of operating temperature ranging from -55C to +125C.The MC74AC161MG operates to count up or down at a frequency of up to 20MHz, and is ideal for applications where high speed performance is required such as separating serial data streams or performing time operations. The counter features a reset input that when enabled, allows the user to reset the counter to the defined logic level and start counting again. The device also has an active-low enable input which can be used to enable or disable the counter. The functionality of the MC74AC161MG consists of a pair of 8-bit binary counters that can be cascaded, allowing the user to effectively double the width of the counter. This is done by connecting the cascade pins of the counter. Depending on the settings of the control inputs, the MC74AC161MG can be used to create a wide variety of counting schemes such as freely configurable flip flop, linear counter, tail-chained counter, registers and more.A typical application in which the MC74AC161MG would be used is to divide down a clock signal. This would involve connecting a clock signal to the up/down input and then connecting the reset and count enable pins to the logic levels you would want the counter to start at. The clock signal then triggers the counter to begin counting from the logic levels set at the reset and enable pins to the next logic level. At the end of the count the counter will return back to the logic level set at the reset and the count enable pins, repeating continually each time the clock signal is triggered, forming a divide down counter. Another application of the MC74AC161MG is in linear counter operation. This involves connecting the up/down input of the counter to the logic high level and the reset and count enable pins to the logic low level. The counter then starts counting from all zeros to all ones and then it will reset back to all zeros, generating a sequence from all zeros to all ones. In this case, the counter will lock in the logic high logic level at the up/down input.Overall, the MC74AC161MG is a highly efficient counter, offering high-speed operation, low-power operation, flexibility in various counting operations and a wide range of operating temperature. This makes it an ideal choice for applications seeking a high-performance, low-power counting solution.

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