The recommended power-up sequence is to apply VCC first, followed by VEE, and then the clock signal. This ensures proper device operation and prevents potential latch-up conditions.
To ensure reliable data transmission over long distances, use a differential transmission line with a characteristic impedance of 100 ohms, and terminate the line with a 100-ohm resistor at the receiving end. Additionally, use a clock frequency that is within the recommended range and ensure that the signal amplitude is within the specified limits.
The maximum cable length supported by the DS89C420-ECL depends on the clock frequency and the signal amplitude. As a general guideline, the maximum cable length is approximately 10 meters at 100 Mbps and 5 meters at 200 Mbps. However, this can vary depending on the specific application and environment.
To handle skew between the clock and data signals, use a clock signal with a rise time of less than 1 ns and a fall time of less than 1 ns. Additionally, use a data signal with a rise time of less than 2 ns and a fall time of less than 2 ns. This ensures that the clock and data signals are properly aligned and reduces the risk of data errors.
The recommended layout and routing for the DS89C420-ECL involves keeping the clock and data signal traces as short as possible and away from noise sources. Use a ground plane to reduce electromagnetic interference (EMI) and ensure that the signal traces are properly terminated. Additionally, use a differential pair for the clock and data signals to reduce common-mode noise.
DS89C420-ECL datasheet
by Maxim Integrated Products
