The SN74HC161D is an integrated circuit (IC) component that belongs to the 74HC series of high-speed CMOS logic devices. It is a synchronous presettable decade counter and has the ability to count up to 10 (decade) in binary-coded decimal (BCD) format.
Key Features:
1. Synchronous Operation: The SN74HC161D operates synchronously, meaning that the counting occurs based on a clock signal. The inputs are only recognized when a positive edge of the clock signal occurs, ensuring proper synchronization of the circuit.
2. Presetable Counter: This IC has a preset input (PRESET\) which allows the user to set the counter to any desired value. When the preset input is low, the counter is enabled, and any changes in the parallel inputs (A, B, C, and D) will immediately change the counter's output.
3. Ripple Carry Output: The SN74HC161D provides a ripple carry output (RCO) that can be used to cascade multiple counters for expanding the counting capability. The RCO generates a pulse when the counter transitions from 9 (1001) to 0 (0000), which can then be used to trigger the next counter in the cascade.
4. Count Enable and Clock Enable Inputs: This IC features count enable (CE\) and clock enable (CEN\) inputs that allow the user to control the counting operation
