dm74ls166 Fairchild Semiconductor, dm74ls166 Datasheet - Page 2

• Manufacturer Part Number: dm74ls166
• Description: 8-bit Parallel-in/serial-out Shift Register
• Manufacturer: Fairchild Semiconductor

www.fairchildsemi.com
Function Table
H
L
X
a…h
Q
Q
Logic Diagram
Timing Diagram
A0
An
LOW Level (steady state)
Transition from LOW-to-HIGH level
HIGH Level (steady state)
Don’t Care (any input, including transitions)
, Q
, Q
B0
Gn
The level of steady-state input at inputs A through H, respectively
, Q
,
H0
The level of Q
The level of Q
Clear
A
, Q
H
H
H
H
H
L
G
A
, respectively, before the most recent
, Q
B
, Q
Shift/
Load
H
H
H
, respectively, before the indicated steady-state input conditions were established
X
X
X
Typical Clear, Shift, Load, Inhibit and Shift Sequences
L
Inhibit
Clock
X
H
L
L
L
L
Inputs
Clock
X
L
transition of the clock
Serial
X
X
X
H
X
L
2
Parallel
A…H
a…h
X
X
X
X
X
Q
Q
Q
H
L
a
L
A0
A0
A
Outputs
Internal
Q
Q
Q
Q
Q
L
b
B0
An
An
B0
B
Output
Q
Q
Q
Q
Q
L
h
Gn
Gn
H0
H0
H