dm74ls194a Fairchild Semiconductor, dm74ls194a Datasheet - Page 2

• Manufacturer Part Number: dm74ls194a
• Description: 4-bit Bidirectional Universal Shift Register
• Manufacturer: Fairchild Semiconductor

www.fairchildsemi.com
Function Table
H
L
X
a, b, c, d
Q
Q
Logic 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
Bn
, Q
, Q
The level of steady state input at inputs A, B, C or D, respectively.
C0
Cn
, Q
, Q
Clear
D0
Dn
H
H
H
H
H
H
H
L
The level of Q
The level of Q
S1
X
X
H
H
H
L
L
L
Mode
A
A
S0
, Q
, Q
X
X
H
H
H
L
L
L
B
B
, Q
, Q
C
C
Clock
, or Q
, respectively, before the most-recent
X
X
L
D
, respectively, before the indicated steady state input conditions were established.
Inputs
Left
H
X
X
X
X
X
L
X
Serial
Right
X
X
X
H
X
X
X
L
2
A
X
X
X
X
X
X
X
a
transition of the clock.
Parallel
B
X
X
X
X
X
X
X
b
C
X
X
X
X
X
X
X
c
D
X
X
d
X
X
X
X
X
Q
Q
Q
Q
Q
H
L
a
L
A0
Bn
Bn
A0
A
Q
Q
Q
Q
Q
Q
Q
Outputs
L
b
B0
An
An
Cn
Cn
B0
B
Q
Q
Q
Q
Q
Q
Q
L
c
C0
Dn
Dn
C0
Bn
Bn
C
Q
Q
Q
Q
Q
H
L
d
L
D0
Cn
Cn
D0
D