74HC164 Datasheet, PDF (2/10 Pages) NXP Semiconductors – 8-bit serial-in/parallel-out shift register

Pin Descriptions
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Pin Name
DSA
DSB
Q0
Q1
Q2
Q3
GND
CP
MR
Q4
Q5
Q6
Q7
VCC
74HC164
400
Function
Serial Data Input
Serial Data Input
Data Output
Data Output
Data Output
Data Output
Ground
Clock Pulse –Positive Edge Triggered
Master Reset - Asynchronous
Data Output
Data Output
Data Output
Data Output
Supply Voltage
Function Table (Note 4)
Mode
MR
Input
CP
DSA
DSB
Output
Q0
Q1-Q7
Reset
L
X
X
X
L
L
H
↑
L
X
L
Qn←Qn-1 (n= 1 to7)
Shift
H
↑
X
L
L
Qn←Qn-1 (n= 1 to7)
H
↑
H
H
H
Qn←Qn-1 (n= 1 to7)
Note:
4. Signals asserted on DSA and DSB must be in place longer than Tsu (set-up time) before CP occurs and remain in place Thold (hold time) after CP.
Logic Diagram
DSA ¹
DSB ²
CP ⁸
MR ⁹
DQ
DQ
DQ
DQ
DQ
DQ
DQ
DQ
C
C
C
C
C
C
C
C
R
R
R
R
R
R
R
R
3
4
5
6
10
11
12
13
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
74HC164
Document number: DS36279 Rev. 2- 2
2 of 10
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March 2015
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