djnik1362
Full Member level 2
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hi
I have a board that use a 20 MHz TTL oscillator .
I must send this clock out to some other boards too.
I need help to use proper hardware.
My idea was to connect oscillator output to bunch of inputs of 74hct245 buffer
(for more current) and then connect outputs of connected inputs to produce buffered clock.
I already use this idea but it didn't works.
Buffer outputs (Connected Outputs) amplitude is between 2.5 to 4 V and
there is a distortion in wave. Oscillator output voltage is between 2 to 5V.
i use a 50 ohm series resistor for clock input of FPGA but connect oscillator's
output directly to buffer inputs without any series resistor.
May be there is a discontinuity in impedance or 74hct245 isn't proper for that.
Can you help me for this situation.
Thanks for your support.
I have a board that use a 20 MHz TTL oscillator .
I must send this clock out to some other boards too.
I need help to use proper hardware.
My idea was to connect oscillator output to bunch of inputs of 74hct245 buffer
(for more current) and then connect outputs of connected inputs to produce buffered clock.
I already use this idea but it didn't works.
Buffer outputs (Connected Outputs) amplitude is between 2.5 to 4 V and
there is a distortion in wave. Oscillator output voltage is between 2 to 5V.
i use a 50 ohm series resistor for clock input of FPGA but connect oscillator's
output directly to buffer inputs without any series resistor.
May be there is a discontinuity in impedance or 74hct245 isn't proper for that.
Can you help me for this situation.
Thanks for your support.