17 lines
631 B
Markdown
17 lines
631 B
Markdown
- Output depends on input and past behavior
|
|
- Requires use of storage elements
|
|
|
|
# Latches
|
|
## SR Latch
|
|
SR stands for *Set*/*Reset*, and functions like so:
|
|
- When a signal comes into $S$, $Q_a$ is **set** on and stays on until a signal comes into $R$, at which point the output ($Q_a$) is **reset**, back to zero.
|
|
- $S$ and $R$ are interchangeable, it just impacts whether $Q_a$ or $Q_b$ is set/reset.
|
|
Truth table:
|
|
|
|
| $S$ | $R$ | $Q_a$ | $Q_b$ |
|
|
| --- | --- | ----- | ----- |
|
|
| 0 | 0 | 0/1 | 1/0 |
|
|
| 0 | 1 | 0 | 1 |
|
|
| 1 | 0 | 1 | 0 |
|
|
| 1 | 1 | 0 | 0 |
|
|
![[Pasted image 20250303095542.png]] |