SN74ALS191AN

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The SN74ALS191AN is a programmable 4-bit counter which is categorized under the Logic – Counters, Dividers. This device is an asynchronous binary chain counter specifically designed for applications where low power consumption, wide supply voltage range, accuracy should be maintained. It consists of four synchronous four-stage binary counters, two 4-bit programmable dividers and a 4-bit latch to store the counter values.

The SN74ALS191AN works with a low power consumption, and its divider section works for a wide range of power supply voltages such as 1.8V to 5V. This provides excellent accuracy and does not require additional circuit components. The counter section works for a wide range of frequencies such as 1Hz to 50kHz. The device also consists of a programmable synchronous four-bit counter which can count from 0 to 15.

The SN74ALS191AN has specific application fields. It is mostly used in the industrial sector such as motors, relays, solenoids, load-following applications and digital control systems. It is also used in consumer electronics and telecommunications. The device provides a fast and low-cost solution for digital control systems as it has improved accuracy and features a low current consumption.

The SN74ALS191AN operates in strobing mode. After programming, the counter starts to count, and it produces a strobe pulse every time the counter reaches the programmed value. The strobe signal can be used to reset the counter to zero. This helps to prevent lock-ups and ensures reliable operation. The device has an auto-reset function in which the counter output is reset to zero in case of power loss or when the signal is lost.

The SN74ALS191AN has a few restrictions. It is important to remember that the device performs no self-checking and requires an external system to validate the input data. It is also important to note that the device has no error detection or correction capabilities. In other words, it cannot detect and correct any errors that occur during programming.

In summary, the SN74ALS191AN is a 4-bit counter that is categorized under the Logic – Counters, Dividers. It offers a low power consumption, a wide supply voltage range, and a wide range of frequencies. It has specific applications such as motors, relays, solenoids, load-following applications and digital control systems. It operates in strobing mode and has an auto-reset function in case of power loss or when the signal is lost. However, it has no self-checking and error detection capabilities.

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