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參數(shù)資料
| 型號： | 74HC195 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 4-bit parallel access shift register |
| 中文描述： | 4位并行存取移位寄存器 |
| 文件頁數(shù)： | 4/9頁 |
| 文件大小： | 67K |
| 代理商： | 74HC195 |
December 1990
4
Philips Semiconductors
Product specification
4-bit parallel access shift register
74HC/HCT195
APPLICATIONS
Serial data transfer
Parallel data transfer
Serial-to-parallel data transfer
Parallel-to-serial data transfer
FUNCTION TABLE
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
OPERATING MODES
INPUTS
OUTPUTS
MR
CP
PE
J
K
D
n
X
X
X
X
X
d
n
Q
0
L
H
L
q0
q0
d
0
Q
1
L
q0
q0
q0
q0
d
1
Q
2
L
q1
q1
q1
q1
d
2
Q
3
L
q2
q2
q2
q2
d
3
Q
3
H
q2
q2
q2
q2
d
3
asynchronous reset
shift, set first stage
shift, reset first stage
shift, toggle first stage
shift, retain first stage
parallel load
L
H
H
H
H
H
X
↑
↑
↑
↑
↑
X
h
h
h
h
l
X
h
l
h
l
X
X
h
l
l
h
X
Fig.4 Functional diagram.
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