The maximum clock frequency of the SN7474J is 25 MHz, but it can vary depending on the operating voltage and temperature. It's recommended to check the datasheet for specific frequency limits under different operating conditions.
To ensure proper power and decoupling, connect the VCC pin to a stable 5V power supply, and decouple the power supply lines with 0.1 μF ceramic capacitors. Additionally, use a 10 μF electrolytic capacitor to filter out any noise on the power supply lines.
The recommended input rise and fall time for the SN7474J is 10 ns to 100 ns. Faster input transitions can cause internal node oscillations, while slower transitions can lead to increased power consumption.
The SN7474J is designed to operate at 5V, but it can be used in a 3.3V system with some limitations. The device will still function, but the output voltage levels will be reduced, and the noise immunity may be compromised. It's recommended to use a level translator or a voltage regulator to ensure proper operation.
The asynchronous reset input (R) on the SN7474J is active-low, meaning it resets the flip-flops when it's low. To ensure proper reset operation, connect the R input to a pull-up resistor and a capacitor to ground to filter out any noise. The reset pulse should be at least 10 ns wide to ensure proper reset operation.
SN7474J datasheet
by Texas Instruments
