The SN74ALS191ANS is an integrated circuit (IC) component that belongs to the 74ALS series. It is a 4-bit synchronous up/down counter with parallel load functionality. This IC is widely used in digital electronics and microprocessor systems for counting, timing, and synchronization purposes. Here are some of its key features:
1. Counter Modes: The SN74ALS191ANS offers both up counting and down counting modes, which can be selected using the UP/DOWN input pin. This versatility allows it to be utilized in a variety of applications.
2. Synchronous Operation: The counter operates synchronously with the clock input signal. On each rising edge of the clock, the counter increments or decrements based on the selected count direction.
3. Parallel Load: This IC component has a parallel load feature that enables the user to preset the counter value. The desired count can be loaded into the counter by applying the desired binary value to the parallel load inputs (A, B, C, D) when the LOAD input is high.
4. Bidirectional Counting: With the UP/DOWN input, the counter can count both upwards and downwards. When the UP/DOWN input is low, the counter counts down, and when it is high, the counter counts up
