MC74HC165A_16 Datasheet, PDF (2/12 Pages) ON Semiconductor – 8-Bit Serial or Parallel-Input/ Serial-Output Shift Register

SERIAL SHIFT/
PARALLEL LOAD
1
CLOCK 2
E3
F4
G5
H6
Q_H 7
GND 8
MC74HC165A
16 V_CC
15 CLOCK INHIBIT
14 D
13 C
12 B
11 A
10 S_A
9 Q_H
SERIAL SHIFT/
PARALLEL LOAD V_CC
1 16
CLOCK 2
E3
F4
G5
GND
H6
Q_H 7
89
GND Q_H
15 CLOCK INHIBIT
14 D
13 C
12 B
11 A
10 S_A
Figure 1. Pin Assignments
PARALLEL
DATA
INPUTS
A ¹¹
B ¹²
13
C
D ¹⁴
E3
F4
G5
SERIAL
DATA
INPUT
H6
S_A ¹⁰
SERIAL SHIFT/ 1
PARALLEL LOAD
CLOCK ²
CLOCK INHIBIT ¹⁵
9 _QH
7
Q_H
SERIAL
DATA
OUTPUTS
PIN 16 = V_CC
PIN 8 = GND
Figure 2. Logic Diagram
Serial Shift/
Parallel Load
L
H
H
H
H
H
H
H
FUNCTION TABLE
Inputs
Internal Stages
Output
Clock
Clock Inhibit
S_A
X
X
X
L
L
L
H
L
L
L
H
X
H
X
H
X
X
A−H
a…h
X
X
X
X
X
X
Q_A
Q_B
Q_H
a
b
h
L
Q_An
Q_Gn
H
Q_An
Q_Gn
L
Q_An
Q_Gn
H
Q_An
Q_Gn
No Change
L
L
X
X
No Change
X = don’t care
Q_An − Q_Gn = Data shifted from the preceding stage
Operation
Asynchronous Parallel Load
Serial Shift via Clock
Serial Shift via Clock Inhibit
Inhibited Clock
No Clock
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