The maximum clock frequency of the SN54LS166AJ is 36 MHz, but it can vary depending on the operating voltage and temperature. It's recommended to check the timing characteristics in the datasheet for specific frequency limits.
To ensure proper power and decoupling, use a 0.1 μF ceramic capacitor between VCC and GND, and a 10 μF electrolytic capacitor between VCC and GND. Place the capacitors as close to the device as possible. Also, ensure that the power supply voltage is within the recommended range of 4.5V to 5.5V.
The maximum input voltage that the SN54LS166AJ can tolerate is 5.5V. Exceeding this voltage can cause damage to the device. It's recommended to use input voltage limiting resistors or clamping diodes to prevent overvoltage conditions.
The asynchronous clear (CLR) input should be tied to VCC through a pull-up resistor (e.g., 1 kΩ) to prevent accidental clearing of the counter. When CLR is low, the counter is reset to zero. When CLR is high, the counter operates normally.
The SN54LS166AJ has a output drive capability of 15 mA per output pin. This means that each output pin can drive a load of up to 15 mA without exceeding the maximum current rating of the device.
SN54LS166AJ datasheet
by Texas Instruments
