7474: Difference between revisions
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Latest revision as of 16:06, 5 April 2024
The 7474 (variants 74LS74, 74HC74) is a 74-series logic IC with two independent D flip-flops.[1]
Pinout
.--\/--.
/1RST -> |01 14| -- +5V
1D -> |02 13| <- /2RST
1CLK -> |03 12| <- 2D
/1SET -> |04 11| <- 2CLK
1Q <- |05 10| <- /2SET
/1Q <- |06 09| -> 2Q
Gnd -- |07 08| -> /2Q
`------'
Signal descriptions
For each flip-flop:
| Inputs | Outputs | ||||
|---|---|---|---|---|---|
| /RST | /SET | CLK | D | Q | /Q |
| L | H | X | L | H | |
| H | L | H | L | ||
| L | N | ||||
| H | L | X | U | ||
| ↑ | H | H | L | ||
| L | L | H | |||
L = low, H = high, ↑ = low to high, X = don't care, N = nonstable, U = unchanged.
