74HCU195 查看數據表（PDF） - Philips Electronics
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74HCU195 Datasheet PDF : 9 Pages
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Philips Semiconductors
4-bit parallel access shift register
Product specification
74HC/HCT195
Fig.4 Functional diagram.
APPLICATIONS
• Serial data transfer
• Parallel data transfer
• Serial-to-parallel data transfer
• Parallel-to-serial data transfer
FUNCTION TABLE
OPERATING MODES
asynchronous reset
shift, set first stage
shift, reset first stage
shift, toggle first stage
shift, retain first stage
parallel load
INPUTS
OUTPUTS
MR CP PE
J
K Dn
Q0
Q1
Q2 Q3 Q3
L
X
X
X
XX
L
L
L
L
H
H
↑
h
h
hX
H
q0 q1 q2 q2
H
↑
h
l
lX
L
q0 q1 q2 q2
H
↑
h
h
lX
q0
q0 q1 q2 q2
H
↑
h
l
hX
q0
q0 q1 q2 q2
H
↑
l
X
X dn
d0
d1
d2
d3
d3
Notes
1. H = HIGH voltage level
h = HIGH voltage level one set-up time prior to the LOW-to-HIGH clock transition
L = LOW voltage level
I = LOW voltage level one set-up time prior to the LOW-to-HIGH clock transition
q, d = lower case letters indicate the state of the referenced input (or output) one set-up time prior to the
LOW-to-HIGH clock transition
X = don’t care
↑ = LOW-to-HIGH clock transition
December 1990
4
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