Datasheet
SCBS136M − MAY 1992 − REVISED OCTOBER 2003
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
description/ordering information (continued)
Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors
with the bus-hold circuitry is not recommended.
These devices are fully specified for partial-power-down applications using I
off
. The I
off
circuitry disables the
outputs, preventing damaging current backflow through the devices when they are powered down.
FUNCTION TABLE
(each flip-flop)
INPUTS
OUTPUT
CLR
CLK D
OUTPUT
Q
L X X L
H ↑ HH
H ↑ LL
H H or L X Q
0
logic diagram (positive logic)
CLK
1D
1Q
2D
2Q
3D
3Q
4D
4Q
5D
5Q
6D
6Q
7D
7Q
8D
8Q
CLR
1D
R
C1
1D
R
C1
1D
R
C1
1D
R
C1
1D
R
C1
1D
R
C1
1D
R
C1
1D
R
C1
3 4 7 8 13 14 17 18
2 5 6 9 12 15 16 1
9
11
1
CLK(I)
R