The maximum clock frequency of the SN74LS257BDR is typically around 30-40 MHz, but it can vary depending on the specific application and operating conditions. It's recommended to check the device's timing characteristics and perform simulations to determine the maximum clock frequency for a specific design.
To ensure proper power supply and decoupling, connect the VCC pin to a stable 5V power supply, and decouple the power supply lines with 0.1uF ceramic capacitors as close to the device as possible. Additionally, use a 10uF electrolytic capacitor to filter out any noise or ripple on the power supply lines.
The propagation delay of the SN74LS257BDR is typically around 10-15 ns, but it can vary depending on the specific operating conditions and temperature. Refer to the device's datasheet for more detailed information on propagation delay and other timing characteristics.
Yes, the SN74LS257BDR can be used as a demultiplexer by connecting the output of the device to multiple destinations and using the select inputs to route the data to the desired output. However, keep in mind that the device is designed as a multiplexer, and using it as a demultiplexer may require additional logic and circuitry.
The enable input (E) of the SN74LS257BDR is an active-low input, which means that the device is enabled when the input is low (logic 0) and disabled when the input is high (logic 1). When the device is disabled, the output is in a high-impedance state, and the input data is not passed through to the output.
SN74LS257BDR datasheet
by Texas Instruments
