Hi,
I have a 555 outputing to a JK flipflop to generate a 2bit timing circuit (00,01,10,11). The voltages are TTL. However, I am trying to control a switching device (Hittite's HMC344LC3
http://www.hittite.com/content/documents/data_sheet/hmc344lc3.pdf ) which requires 0/-5v control. They recommend a TTL interface circuit (on page 5 of 6), but I have both simulated and built the circuit and can't get either to work.
Any suggestions on how to achieve this would be warmly received.
Many thanks,
Phil
I have a 555 outputing to a JK flipflop to generate a 2bit timing circuit (00,01,10,11). The voltages are TTL. However, I am trying to control a switching device (Hittite's HMC344LC3
http://www.hittite.com/content/documents/data_sheet/hmc344lc3.pdf ) which requires 0/-5v control. They recommend a TTL interface circuit (on page 5 of 6), but I have both simulated and built the circuit and can't get either to work.
Any suggestions on how to achieve this would be warmly received.
Many thanks,
Phil