SN74ALS191ANSRG4

Timing:	Synchronous
Base Part Number:	74ALS191
Supplier Device Package:	16-SO
Package / Case:	16-SOIC (0.209", 5.30mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C
Voltage - Supply:	4.5V ~ 5.5V
Trigger Type:	Positive Edge
Count Rate:	30MHz
Series:	74ALS
Reset:	--
Number of Bits per Element:	4
Number of Elements:	1
Direction:	Up, Down
Logic Type:	Binary Counter
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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SN74ALS191ANSRG4: Logic - Counters, Dividers

The SN74ALS191ANSRG4 is a counter and divider, a type of Logic device. It has numerous applications in electronic circuitry and its operation is simple, allowing it to be used in a variety of ways. In this article, we\'ll discuss the application field and working principle of SN74ALS191ANSRG4.The SN74ALS191ANSRG4 is a 4-bit up/down synchronous counter and divider specifically designed for use as a programmable frequency divider, clock control, and divide-by-N synchronizer. The device comes in two packages; the DIP (Dual In-line Package) and PDIP (Plastic DIP) and has four basic modes of operation; up-down, up-and-wait, down-and-wait, and hold.The SN74ALS191ANSRG4 can be used in a wide range of applications from generating fixed frequency outputs to frequency division of signals as high as 100 MHz. It is suitable for use in applications such as interfacing with different kinds of frequency standards, logic based frequency counter, frequency locking, data timing and amplitude control, instrumentation frequency synchronisation, and frequence synthesizers.SN74ALS191ANSRG4 is capable of dividing pulses by any integer up to 4096, and features out of lock detection. This makes it ideal for use in frequency synthesisers, and is why it is so commonly used in frequency controlling circuitry.The application field of the device is further supplemented by its ability to modulate an internally generated pulse-width modulated output. This allows more complex frequency control capabilities, as its output is adjustable, making it suitable for pulse-width modulation as well.Working PrincipleThe SN74ALS191ANSRG4 is a synchronous, programmable 4-bit up/down binary counter and divider built on seven separate logic elements. It works by counting pulses presented to its Clock Input terminal and providing either of two outputs; a “high” count, or a “low” count, depending on the pulse count.The "high" terminal is labeled "Q4" and will count up to seven (7) before resetting to zero (0); whereas the "low" terminal is labeled "Q1" and will count up to three (3) before resetting to zero (0). When the device is not counting, it is held in the "reset" state, so as to keep the counter at zero (0).The SN74ALS191ANSRG4 also has capabilities allowing it to divide pulses, so as to produce a regular pulse sequence with a programmable duty cycle. This means that the duty cycle of the output frequency can be considerably changed, depending on the number of pulses to be divided, and the period of the output frequency. The device is capable of outputting a frequency which is an exact multiple of the input frequency, making it suitable for frequency synthesizers needing complex output signals as well as stable pulse dividers.The SN74ALS191ANSRG4 is also helps to keep the input signal frequency stable, as it maintains enter frequency control. This is done by allowing the user to modulate the input signal frequency as needed, so as to compensate for any possible frequency variations.In conclusion, the SN74ALS191ANSRG4 is a highly capable, programmable counter and divider, with a variety of applications in both frequency synthesis and pulse division. Its ability to divide frequencies, modulate pulse-width, and keep input signals stable, makes it an ideal choice for complex frequency control.

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