Diodes 74HCT594 User Manual
Page 3
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74HCT594
Document number: DS35491 Rev. 2 - 2
3 of 12
June 2013
© Diodes Incorporated
74HCT594
Functional Description and Timing Diagram
Control Input
Output
Function
SHR STR SHCP STCP DS
Q7S
Qn
L X X X X L
NC Clear
Shift
Register
X L X X X NC
L Clear
Storage
Register
H X
L
H or L
Q6S
NC
Loads DS into shift register stage 0. All Q
S
shifted
H H X
X NC Qs
Contents of shift register moved to starge register all Q
S
-> Q
N
H H
H or L
Q6S
QnS
Shift Register one pulse count ahead of storage register.
H=HIGH voltage state
L=LOW voltage state
↑=LOW to HIGH transition
X= don’t care – high or low (not floating)
NC= No change
SHCP
DS
STCP
SHR
STR
Q0
Q1
Q6
Q7
Q7S
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