JK flip-flop with SET and RESET inputs, edge triggered
Compared with a standard JK flip-flop, this JK flip-flop also has an inverted input S for set and an inverted input R for reset. The input K is also inverted.
Truth table
| not S | not R | C | J | not K | Q1 | Q2 |
|---|---|---|---|---|---|---|
| 0 | 1 | x | x | x | 1 | 0 |
| 1 | 0 | x | x | x | 0 | 1 |
| 0 | 0 | x | x | x | 1 | 1 |
| 1 | 1 | ↑ | 1 | 0 | q2 | q1 |
| 1 | 1 | ↑ | 0 | 0 | 0 | 1 |
| 1 | 1 | ↑ | 1 | 1 | 1 | 0 |
| 1 | 1 | ↑ | 0 | 1 | q1 | q2 |
Comments:
x = any (0 or 1) ↑ = positive edge from 0 to 1 q = state of output Q before the edge
The IC 74HC109 is used as a component in the training package TP 1012 from Festo Didactic.
Adjustable parameters
| Designation | Range | Default value |
|---|---|---|
| Voltage level (lo) | 0.1 ... 24 V | 0.8 |
| Voltage level (hi) | 0.1 ... 24 V | 2 |
| Designation | Range | Default value |
|---|---|---|
| Voltage level (lo) | 0 ... 24 V | 0 |
| Voltage level (hi) | 0.1 ... 24 V | 5 |
| Resistance | 0.1 ... 1000 Ohm | 55 |