74174: Difference between revisions

Revision as of 08:49, 5 May 2021

74174

Hex D flip-flop

Used as page register for memory paging in ZX Spectrum 128K

Pinout

CLEAR

1Q

1D

2D

2Q

3D

3Q

GND

1 °       16

2         15

3         14

4         13

5         12

6         11

7         10

8         9

VCC

6Q

6D

5D

5Q

4D

4Q

CLK

Function table
(each flip-flop)

Inputs
Output

CLEAR
CLK
xD
xQ

L
X
X
L

H
↑
H
H

H
↑
L
L

H
L
X
xQO

H = high level (1) steady state
L = low level (0) steady state
X = irrelevant
↑ = transition from L to H
xQ_O = the level of xQ before the indicated steady-state input conditions were established

@@ Line 51: / Line 51: @@
 |H||&uarr;||L||L
 |-
-|H||L||X||Q<sub>O</sub>
+|H||L||X||xQ<sub>O</sub>
 |}
 </div>
@@ Line 58: / Line 58: @@
 X = irrelevant<br>
 &uarr; = transition from L to H<br>
-Q<sub>O</sub> = the level of Q before the indicated steady-state input conditions were established
+xQ<sub>O</sub> = the level of xQ before the indicated steady-state input conditions were established
 [[Category:Hardware]]
 [[Category:Integrated Circuit]]

74174: Difference between revisions

Revision as of 08:49, 5 May 2021

74174

Pinout

Function table(each flip-flop)

Navigation menu

Search

Function table
(each flip-flop)