SN74ALS561ANG4

Timing:	Synchronous
Base Part Number:	74ALS561
Supplier Device Package:	20-PDIP
Package / Case:	20-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Operating Temperature:	0°C ~ 70°C
Voltage - Supply:	4.5V ~ 5.5V
Trigger Type:	Positive Edge
Count Rate:	30MHz
Series:	74ALS
Reset:	Asynchronous/Synchronous
Number of Bits per Element:	4
Number of Elements:	1
Direction:	Down
Logic Type:	Binary Counter
Part Status:	Active
Packaging:	Tube

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The SN74ALS561ANG4 is a counter, divider chip that belongs to the logic family of chips. It is specifically designed to be used in applications that require accurate counting and division of pulses. This device is capable of providing up to 144 counts of half-scale division with a maximum division ratio of 128:1. It is available in a 14-pin DIP package and is powered by a 5 volt supply.The SN74ALS561ANG4 is a four-bit binary counter/divider designed to provide count and divide operations that are frequency and duty cycle independent. The device is comprised of four synchronous four-bit ripple counters and a divide-by-N circuit. The divide-by-N circuit utilizes an up/down control logic that determines whether a pulse is counted up or counted down.The dividers in the SN74ALS561ANG4 are composed of 16 TTL-compatible flip-flops which operate on a low-voltage power supply of 5 V. Each of the four sections can be controlled by external control signals to set the count/behavior, such as count up, count down, reset, preset, synchronous reset, and asynchronous reset.The SN74ALS561ANG4 has three inputs: Count Enable, Up/Down Control and Reset Input. The Count Enable input is used to enable or disable the operation of the device or to start and cycle through the counting sequence. The Up/Down Control logic activates the internal up or down pulses and the reset input clears all four sections of the device and returns them to the preset state. The outputs can be configured to either parallel or serial format depending on how the output connection pins are wired. The parallel outputs are independent of each other while the serial outputs are cascaded. The outputs are available in two types: active high Q and active low Q\#. The Q output will transition to a low state when the counter reaches the preset count and is used as an indication for reset operation. The Q\# output will transition to a high state and can be used to terminate a count sequence or trigger an event.The SN74ALS561ANG4 has a wide range of applications in frequency-division, pulse width modulation, and time-division multiplexing (TDM) systems as well as in telecom, instrumentation and industrial control systems. It can be used in a variety of situations such as time-division switching systems, pulse generators and pulse detection circuits.Overall, the SN74ALS561ANG4 counter/divider is an extremely versatile device that can be used in a wide range of frequency-division applications. Its ease of connection and manipulation makes it an ideal choice for many digital systems. Its robust design and wide range of application fields makes it an excellent solution for a variety of logic devices.

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