Hello Folks,
I have a problem trying to simulate a simple sequential circuit in Orcad capture (previously know as PSpice). Infact I have no problem with the circuit, I do have a problem with setting the JK flip-flop up. I am using the 74LS76 (JK flip flop with preset and clear), had a look at the data sheet and the characteristic table implies that as long as both preset and clear are taken high the should cause Q to be 0. After that the flip flop should change on the falling edge of a clock pulse; however my output trace does not reflect the JK flip flop characteristics too well.
My settings are as follows:
Preset and clear both taken high, clock set to a frequency of 10 Hz (50ms low and 50ms high).
J and K inputs are connected to STIMS, which cycle through all combinations at 100ms time frames.
J = 0, 1, 0, 1 and
K = 0, 0, 1, 1
Q should be: 0, 1, 0, Toggle
I would very much appreciate any help or advice that you could offer
Jag.
I have a problem trying to simulate a simple sequential circuit in Orcad capture (previously know as PSpice). Infact I have no problem with the circuit, I do have a problem with setting the JK flip-flop up. I am using the 74LS76 (JK flip flop with preset and clear), had a look at the data sheet and the characteristic table implies that as long as both preset and clear are taken high the should cause Q to be 0. After that the flip flop should change on the falling edge of a clock pulse; however my output trace does not reflect the JK flip flop characteristics too well.
My settings are as follows:
Preset and clear both taken high, clock set to a frequency of 10 Hz (50ms low and 50ms high).
J and K inputs are connected to STIMS, which cycle through all combinations at 100ms time frames.
J = 0, 1, 0, 1 and
K = 0, 0, 1, 1
Q should be: 0, 1, 0, Toggle
I would very much appreciate any help or advice that you could offer
Jag.